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JPS4841702

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DESCRIPTION JPS4841702
September, 1972--Patent office director Yukio Miyake-& invention address United States 22-Tok
state Ri-A-Booth Street-1-9th (name 1y Tal · VV Yakka M, jlF application Person-address
American congregation-2-2-州 state Sugane Kuta de-[phase] Japan Patent Office 1 published
patent publication ■ Japanese Patent Application Laid-Open No. 48-44702 title 4 channel stereo
sound V-stem (1) (1) Transmit four channels of program information in a three-dimensional
sound relationship using a main carrier frequency-modulated n with the first signal in the jilyL
number band C2 that limits the maximum frequency. In the frequency spectrum, a first set of @
waves 70 extending from the lowest frequency to the highest frequency region is generated 'f'
B7: second signal (−, C ′ ′) ′ c suppression carrier 1 ′ ′ 1 Width modulated n first
subcarrier. 'The same subcarrier as the first subcarrier which is carrier wave amplitude
modulated by the sixth signal to generate a second set of sidebands extending from the minimum
frequency of the frequency spectrum to the maximum frequency domain, but in quadrature C:
Some second subcarrier. The $ 1 ° W higher than the maximum frequency of the $ 11 signal! I2
set of sideband minimum frequency. A pilot frequency generator having a frequency suitable for
a spectral region bounded by a maximum frequency limit of the first signal and a minimum
frequency limit of the first set of second sidebands. A filtering means for limiting the minimum
frequency of the modulation product (wdnjat tol product) developing from the sixth subcarrier to
a value higher than the maximum frequency appearing in the first and second set of sidebands
from the sixth subcarrier In accordance with the second signal in relation to the amplitude
modulation n. 4 signals included in C2 among 7n et al. And distributed in a scheduled manner.
Information from a signal source having four stereophonic relationships, a main carrier that is
frequency modulated by the pilot frequency 1 ≦ 二 2 The energy distribution from the
modulation of the 1J3 subcarrier ≦ 2 energy distribution is characterized by limiting the lower
sidebands; amplitude modulation operating on the first and second sets of sidebands and the
sixth subcarrier characterized in that product. A four-channel stereo sound system that is
characterized by being capable of transmitting and receiving signals in four separate threedimensional sound relationships. EndPage: 1 • 4 channel information represented by LP% LI, RF
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and R1, respectively, where n is this information. The following relationship first signal == L, + L,
+ R, + R.
2 Claims
DETAILED DESCRIPTION OF THE INVENTION The present invention is a new and improved
broadcast system. In particular, four separate stereophonic relationships C; frequency-modulated
broadcast systems with certain audio frequency (audio frequency) input / outputs o Broadcast or
recorded audio and other elements C 2 realistic listening It is well recognized that entertainment
眸 can often be substantially increased by providing different loudspeakers C; multiple separate
channels or audio feeds, so that the two-channel stereophonic system becomes obsolete Many
record boards and magnetic tape recording media are broadcasted according to the established
standard. A widely adopted and widely standardized type of two-channel stereophonic sound
system is disclosed in U.S. Pat. No. 3,122,610 issued Feb. 25, 1964. The n utilizes a first
frequency band in which the main carrier is modulated with the sum of the left (Z) and right (R)
channels. This dominant transmission is frequency modulated at the sidebands of the 58 KHz
suppressed subcarrier which is amplitude modulated with the difference between the left (L) and
right (R) channels. The pilot signal is In order to give a reference for the local reproduction of the
subcarrier and to give an indication of the presence of the stereophonic sound signal, in the
receiver 受 信 =. 191 in the air gap between the two frequency bands! It is given as Jz. This
highly successful system, is completely compatible with the monophonic mono-frequency
modulation broadcast system of the prior art (C 雫 -tihla). It is now recognized that there are
many advantages to a two-channel system C two-channel three-dimensional sound system that is
realistic and increases listening entertainment by comparison. For example, if the sound 1 'of a
large concert hall is played &: specials; 0 its surrounding C: in the case where the sound reaches
the listener from many directions. Most of this sound is reflected, so it is time-delayed to form an
important part of the listening experience-rt, v Introduce 04 channel stereophonic music is
recorded on magnetic tape, good It is reproduced through the speaker system having the
characteristic T. In addition, four-channel stereophonic music utilizing two separate stations,
which are assigned different central carrier frequencies, limits 1M broadcasts. It is important that
the four-channel stereophonic system be completely compatible (Ctnpat # b1g) with many of the
monophonic and two-channel stereophonic devices present. If complete monophonic and twochannel stereophonic sound information is provided to this device, the present C's established
sum and difference signals and the present code; the established 191JIz pilot signal is applied to
the four-channel system. It must be integrated.
Thus, the information necessary to destroy the jIC2 existing stereophonic sound channel into 4
channels C is established-rL must be superimposed on the 2-channel stereophonic sound
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jamming signal. It is not possible to generate an out-of-band radiation (otbt-of-one-Tadiatim) that
is difficult to receive (Do not know how this goal is achieved. EndPage: 2 pseudo (pzgutLo)
Alternatively, many three-dimensional sound receivers now exist, creating what is called a hybrid
four-channel output. This is achieved by two ordinary stereo human can matrixes at the receiver,
where ≦; one hour late to produce four inputs t each of which is different from the other six
inputs And loudness (achieved with the addition of joutlxya, there are no four separate inputs.
There are four artificially created four inputs, and the relationship between the two pairs of
loudspeakers is in accordance with the preselected scheme (forytblα) when the receiver is built.
Some known systems to be determined enjoy using a matrix of four audio inputs at the
transmitter), but only two channels are transmitted al (= therefore, they are not Similarly, in the
Vibrid system G2 as well, the 4 channel of information is not broadcasted by the transmitter C
nie, so that the receiver can detect this much information 1: the device is not @ such 4 2 The four
currently known loudspeaker receivers, which include a transmitter and at least one receiver, are
designed to broadcast four separate audio connections: an integrated vxf-frame (i *) tayatacL It is
not a part of the ystem). Broadcast systems that allow transmission and reception of human
power (channels) from a single frequency modulation station (in four separate stereophonic
sounds) (if it is possible to provide out-of-band emissions that may interfere with other stations,
of course) It is necessary. This is one frequency modulation broadcast 関: TT current standard
method! Substantial division: Whenever it passes, without recognizing a broadcast signal
containing its harmonics, four stereophonic sound inputs can be achieved by a single main
carrier i: multiplexed 1 L, etc. It is important to provide a system in which the number of
transmissions is the minimum bandwidth inclusion. The receiver design is an essential
compromise between adjacent channel selectivity and receiver channel bandwidth, since the
present invention includes audio frequency inputs in four separate stereophonic relationships. It
comprises both an apparatus and a method for transmitting and receiving a frequency-modulated
main carrier.
The device comprises a transmitter and one or more receivers), the transmitter is responsive to
four separate inputs for producing four matrixes, each of the matrix means being at least one
function Means for generating the main carrier and means Y for frequency modulating the main
carrier with the 17th output of the main carrier ◎ it means for generating on the second carrier,
111th carrier H, 1 the first subcarrier Means for amplitude modulating at the second matrix
output, at the same frequency as the first subcarrier. And means for generating a second
subcarrier wave in an orthogonal phase relationship with the first subcarrier, means for
amplitude modulating the second subcarrier with the sixth matrix output, and suppressing the
first and second subcarriers. Means, and means for frequency modulating the primary carrier
with the modulated sidebands of the first and second subcarriers. The frequencies of the first and
second subcarriers are such that an air gap exists between the lower sidebands of them and the
frequency band of the first matrix output. C: inside the air gap C: means for generating a pilot
signal of falling frequency is given, O: means for frequency modulating the main carrier with the
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pilot signal is further given: more than the frequency of the first and second subcarriers
Frequency C: A means for generating a third subcarrier% Amplitude modulation means for a third
subcarrier according to the output of the $ 4 matrix, A means for modulating the third subcarrier
by other methods最大 Filter means including the means of maximum maximum (two limit T)
below. Remove all T except for a relatively small portion of the sideband above the sixth
subcarrier and attenuate the top portion of the sideband below the sixth subcarrier (塾 pp #
rrsoztp trunk ti □) In order to equalize the transit times of the signals of different frequencies
passing through the zero equalizer means, the two transmitters are further modulated by the
main carrier INt. Means for changing the frequency of the remaining part of the gAfIt band of the
sub-carriers, the frequency of the third sub-carrier is between the lower sideband and the upper
sideband of $ 1 and the second sub-carrier ≦≦ : A gap is present. The receiver of this system,
1st. 2nd and 6th sub-carrier 1I1V playback, pilot signal for reinsertion EndPage: No. 3; means for
responding, means for detecting 4 matrix outputs, 4 matrices for reproducing 4 separate audio
frequencies human power Output 0 (a preferred implementation of the above-described system
comprising two responding de-fist matrix means (da-mtr *: tma3 #);
Four separate audio frequencies human power is the symbol Ll. Assuming that LIRF and R,
denote l, s but O], the four matrix outputs represent functions of their inputs as follows: 0 $ 1
matrix output: L, + L The second matrix output represents (L, + Lx) (RJlRJl), the 0th limiting
means, the 4th matrix, the output of the 11th matrix, and the other possible highest levels. 6090-the maximum price certificate is limited. The maximum value of 60% is the many purpose
book; optimal. Means for generating a control signal indicating the presence of the audio
frequency input in four separate stereophonic tones! In the receiving 1ai 2, there will be a
switching means that is responsive to the presence of the control signal, in order to partially
disconnect the receiver when the control signal is not present. This switching means is also. The
display signal is arranged to give an indication indicating the presence of an audio frequency
input. The display signal preferably has the same frequency as the first subcarrier. This method
consists of a method of transmitting and receiving frequency-modulated main carrier # LY with a
stereophonic input. The method consists of generating four matrix inputs, each of which is a
function of at least four separate audio frequency inputs, generating the main carrier Y and
modulating the main carrier with the W & 1 matrix output. Further, generating the first iI 1 wt
transmission #L, amplitude modulating the first subcarrier with the second matrix output, having
the same frequency as the first subcarrier-), and quadrature phase relationship with the first
subcarrier i It consists of generating two gJ & 2 subcarriers, modulating the second subcarrier
with the sixth matrix output, and weakening or suppressing the first and second subcarriers. The
main carrier, then modulated $ 1. The frequency is modulated in the sideband of the second
subcarrier. The frequencies of the first and second carrier waves are such that there is an air gap
1) between the lower sidebands of the first and second subcarriers and the frequency band of the
(17th) link output. In addition, the method comprises: generating a pilot signal at a falling
frequency; generating a pilot signal at a falling frequency; modulating with a primary carrier pilot
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signal; Frequency of 1 subcarrier or more of frequency of 2 subcarriers or more 3rd subcarrier
generation, amplitude modulation with the 3rd subcarrier fM ヲ 4th matrix output, weakening
the 6th subcarrier (dmygzz *%!
I) that the third sub-carrier is limited to substantially the maximum value below the other highest
possible level of my, etc., removing a relatively small portion of the sideband above the fifth subcarrier, 51i It consists of attenuating the highest part (wpparntajtportion) f of the lower sideband
of the carrier, and equalizing the travel time of the different 6th sub-carrier sideband part with
different frequency. Furthermore, how is that? The frequency of the 0 @ 6 subcarrier comprising
modulation of the main carrier with the remaining part of the modulated '@ 3 subcarrier
sideband is% first and $ 2iIl! There is a gap between the lower wa [band of the transmission and
the upper sideband]. The frequency-modulated n primary carrier is first transmitted by the
antenna, and is transmitted. The method is further: ≦≦ 2, multiplying the pilot signal frequency
1: Comprising: regenerating, reinserting and regenerating '$ 2 and' j $ 5 subcarriers, detecting
four matrix outputs, and regenerating four separate audio frequency signals V from four matrix
outputs . The invention will be more fully understood by reference to the detailed description
given in the following 5 and the accompanying drawings, rt, as well as 04 separate stereophonic
sounding C 2 audio frequency inputs! A broadcasting system capable of transmitting and
receiving the frequency-modulated main carrier including the transmission includes EndPage: 4
units 20 and a receiver 22 &, as shown in FIG. The four audio inputs are provided by four
microphones 24 which pick up the sound from the four area portions where music or other
broadcast programs are provided. Of course, one person, the force can be generated by any of a
number of well known playback devices suitable for reproducing the four pre-recorded inputs.
The audio input from one side of the area where they are generated is left front (LmμFrtnbt) left
back (Laft Rear) for L, and the other two inputs are designated right front. It is designated as R
and R for right back. Thus, the two left, two left and right signals are the left input 1 of a common
two-channel stereo system; n considered corresponding, and the two right inputs are R, R1 and
so on. The right input of the 2 channel stereo system &: considered to correspond. The main
carrier is frequency-modulated TL in the transmitter 20, and the transmitting antenna 26 (two,
therefore, n is 0) This broadcast signal is received [122 (:, between two parts of the receiving
antenna 28 connected. The potential 発 生 1 generated 0 to 4 separate inputs are reproduced
from the broadcast signal from the receiver 22 & 2 and make a broadcast program for the
listener 32 located at the center, again TJ, 、, similar to the microphone 24 Four loudspeakers 6o
arranged in the manner of (:: n applied 4 four separate audio frequency input information
necessary information to reproduce the frequency of the main carrier is modulated) It is included
in the broadcast signal in such a way as to fall within the frequency band of minimum width, ie to
minimize the out-of-band radiation (mt-of-bandradiatm).
FIG. 1 schematically illustrates the baseband utilization of a composite signal in which the
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primary carrier is modulated by a signal line. Sense of main carrier, behind the frequency
modulation; It is considered to be divided into four separate channels. Each of them includes one
of the transmitters 20t; one of the matrix outputs generated. The 1181 matrix outputs 1.50 Hz
Hz F) 15 s 00 cyz C bits, 4 audio inputs, fall into the frequency band 66 representing the sum of
L, E, and R1. C: away from this first matrix output frequency band 66: there is another frequency
band 68, where C2 contains two channels 即 ち, ie one of them (L, +1. )−(Jj。 + R,) y Table
2 conveys the second matrix output, the other includes (L, -L,) (R, -R,), and includes the sixth
matrix output. The third matrix output The part of the frequency band 68 occupied by. Steric ≦;
indicated by region 40 The frequency band 38.40 extends to 2'5 J x z l 55 KH2. It is the sideband
of the first subcarrier at 5 'IJ Iz and the same frequency and 1 $ 2 subcarrier in quadrature with
the first [includes Y 他 の other frequency band 42 is the side of 61 H 2 It includes the wave
band. This fourth channel. (LF-Lm) + (Rp-Rm) l: indication "f547) including a 9-track X output ◇
the combined signal further includes a 19 KHz pilot signal where 8 to 10% of the total
modulation of the main carrier is desired The pilot signal is received by the receiver 22 at the
first 22 second and third subcarriers t! Ilt '1 = used n to play. At least a 2 channel gives an
indication that T is present ◎ The 76 Kc sixth subcarrier is suppressed, which means that about
5 parts of the total modulation of the subcarrier is included in the main carrier It is considered
weak, to the extent that it is considered. This weakened third subcarrier & / or receiver 22 is
detected by the receiver 22 and used as a control signal to indicate the presence of the fourth
channel. If the I86 subcarrier is completely suppressed. The degree of modulation of the primary
carrier in each of the frequency bands 56, 58-40 and 42 is equal to ninety of the largest possible
modulation. The scheme for matrix output display (firmulag) is arranged so that the sum of the
six modulations of 7′L, etc. does not exceed 90% of the maximum possible modulation, and the
511th carrier wave Is completely (not suppressed (F approximately 1 6ttb, x lower), but instead,
simple: degree C considered as 5-of maximum possible modulation of main carrier C; suppressed
If
Each of the frequency bands 56.68-40 and 42 would be filled with 854 of the maximum possible
degree of modulation. Another advantage of the above-mentioned Marx Liks arrangement is that
it is fully C compatible with the currently used monophonic and two channel stereo systems;
EndPage: 5 The first matrix output frequency band 36 is. An end-to-end, modified, ordinary
monophonic receiver 1: The signal portion detected by 二 2 not 0 and that n includes the sum of
94 audio inputs giving a complete monophonic signal. Do. Young. C: made so that L, + L,
correspond to the left channel. Also, if RF′′R1 is designed to correspond to the right channel C
in a two channel configuration, then the second channel 38 is a common two disclosed in US Pat.
No. 5,122.610 (inventor's patent). The second channel of the channel system (bidirectional O, ie,
the first 2 channels) gives the sum value of the 2 normal stereo channels and de matrix (tLamlrix) in the usual way . The 19 KHz pilot signal is adopted as an international standard for the
transmission of two-channel stereo sound signals, so this state of the 0 invention according to the
invention arrangement is compatible with the two-channel system of 7 js-n currently used. O 8
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Here, the bandwidth utilization advantage 8 of the broadcast system disclosed is broadcast by
SCA (5sbtid * aryComtmie atimaut ^ orimt * on) transmission 67 KH 2 but 95 KHz, which is the
fifth harmonic of the 19 KHz pilot 46 Such as relatively low frequency 5: if it is allowed to
broadcast as an additional 4th channel stereo broadcast 0 if 1 if plus or minus 5 KHz frequency
deviation is used , S4 matrix output and 95 KHz; suitable part between frequency bands 42
carrying certain SCA information There should be separation. Of course, the system of the
present invention is capable of producing and utilizing the combined signal shown in transmitter
20 and the first garden! The signal generating part of the transmitter 20 requires a receiver 22
′ ′ 4 of FIG. 6 α, $ 6 b, 4 a, 4 h, 5 α and $ 545 Ai ̶schematic C: shown ◎ audio frequency
inputs in four separate stereophonic relationships from the microphone 24 are supplied with a
plurality of input terminals 45, 46, 48 and 50 (T shown in FIG. 6a) Is applied to the terminal 45,
and its strong intubmty) is adjusted by six variable resistors 52 ≦ arranged in the form of @T ′
′ between the terminal 45 and the conducting wire 54 grounded. O This is referred to as signal
strength adjustment circuit 56-O input L is more than 1st order, more than 15 fMz audio
frequency range!
Normal low-pass filters 58 & 2 are provided to remove noise and information. Input, then, the
ordinary 75 microphones 廿 second pre-emphasis circuit 60C two primary primary transformers
62 &; o and transformers 62 are given TL4: 1-so that the pre-emphasis times wr 60 Easton
Bridge 644 is a combined two. Each of the other inputs R, L, and Rj is input, adjusted in a similar
manner n, filtered, and Brien Encased, respectively, coupled transformers 66, 68 and 70 C; The
input R, from the zero coupling transformer 66 is fed to the Wheaton bridge 64 where it is input.
And OL, which is combined with this, are added on one side of the double bridge 64 which
appears on the line 72, + L, Y <outline>. Then, as the line 74 on the sixty-four, as it produces, the
other pole of the bridge 64 subtracts 0 powers Rj and R, which are from the transformers 68 and
7 o Bridge 76 ≦ 2 supplies, it is arranged in a manner similar to (bridge 76), bridge 64 sale,
line 78 on 1: R, -R, line 80 on 1: R, tens B. Create Line 74 is connected to an amplifier 81 (shown
in FIG. 6b g = shown) including three transistors 82, 84 and 86w o A line 72 includes five
amplifiers nos. Similarly, the line 78 includes six transistors 94. 96 and 98 '& the amplifier 961
connected; the line 80 includes six transistors 100. 102 and 104 "Ik-including the amplifier 99
&; These amplifiers 81.87.93 and 99 are connected together to give four matrix outputs. Thus,
the main carrier is to be modulated. Thus, the $ 1 matrix output, + L j l + R, + R, is fed by line 106
L = by amplifier 108 c, W! I2 matrix output (L, + La)-(R, Rs), line 110c, c "C amplifier 112 is
supplied, sixth matrix, C out (L, = L,)-(RF-R1) Are supplied by the amplifier 114 ≦ line 114, and
the I 84 matrix output (Lp−Rx) + (′ / − RJ) EndPage: 6 is supplied by the line 118 to the
amplifier 120 gm. The Easton Bridge 64, 76 amps 2 amplifiers 81.87.93 and 99's plus provide
matrix means 122, which provide 4 audio files, 4 audio outputs, 4 audio outputs, L ,. ! , And F, i,
in response, each of which is at least one, in this preferred embodiment four input functions O
FIGS. 4a and 4h (as indicated by the letters A-, G) In order to generate a control signal T that is
combined with the subcarrier, the pilot signal and the outputs of the amplifiers 108, 112, 116,
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120), the TV indication TO 152, 000 nlz crystal oscillator 122 A temperature stable heater
(heater) & 60 Hg, power supplied from a 117 V voltage source;
The output of the oscillator 122 is two motorollers MC 791 PD # / 4 J-K 79 rough 17 o rough
124.126 t = n 1 nd order (:, it is continuous L: frequency division n, phase shift n, Four motroller
MCI 709 C operational amplifier integrated circuit components are commercially available 5:
used. Therefore, we will not describe the internal operation of 7n et al. The outputs of flip props
124 and 126 are: 152KHz (1) about 76KHz which will be mentioned later. 5f 3 K 11 z and 19
KHz in phase relationship 6; some square waves. Operational amplifier 128.130, 1! 12 and 164.
Acts as an integrator that converts a square wave into a sawtooth shape a (two-way conversion.
The output of each operational amplifier is shaped into a sine wave by one C2 of the plurality of
field effect transistors 146, 148, 150 and 152. The outputs of these field effect transistors are
respectively it 76 KHz, 58 KHz and 19 KHz. I The 5f3 KHz output of field effect transistor 150 is
90 degrees slower than the 5f3 KHz output of field effect transistor 148. The output of the
transistor 14B and the output of the transistor 146 are both one-half of the 152 kHz oscillator
frequency 6 times 1/2 19 kHz, which is the output of the transistor 152-its harmonics The base
currents of the first transistor stages of .156 and 158 are each individually adjusted by one of a
plurality of variable capacitors 162. 164 and 166 to provide phase matching with the input to
amplifier 160 Be done. Amplifier 16 CH: Relatedly, it is not necessary to provide a variable
capacitance. What n is, because it is a reference point (reference point) to which the other branch
is adjusted. The outputs of the circuits shown in FIGS. 3h and 4h. Figures 5g and 54C: Input
terminal 6 of the circuit shown; the 19 KHz output of the supplied 0 amplifier 160 is supplied by
a pilot amplifier 184C for providing a pilot signal by the input terminal 168 o Level of this pilot
signal And the phase is adjusted by II adjustable resistors 185 and 186, respectively, equal to
10% of the maximum degree of modulation of the main carrier. The output of pilot amplifier 184
is the first matrix from amplifier 108 at node 187c. Output 5; added. A "triple amplifier 188" (supplied-rL, including transistor 189 and impedance matching resistor 190).
The combined pilot and pre-amplifier 188 matrix output, the output of the multistage low pass
filter and delay means 191 is supplied as the first power source transistor 192g: 6 by transistor
192 and the other two transistors 196.198. The 3811z output of amplifier 156 is supplied to
input terminal 172, and the $ 2 matrix output from amplifier 112 is supplied to input terminal
174. These terminals are zero. Mo) 0-la MC 1596 GBalanced Mmtdator Dmwc Lulatey 200 (: give
insert. A similar balanced modulator 202 is The 68 KHz output of amplifier 158 and the sixth
matrix output from amplifier 116 are provided through input terminals 176 and 178Y. Each of
balanced modulators 200 and 202 provides two outputs, which are respectively converted into a
single output by summers 204, 2061; The outputs of the adders 204 and 206 are supplied to the
other adder 208t: supplied 〇 amplifier 156 and 158 158) out cover, 58ffj! C. The means for
generating these subcarriers which provide subcarriers which are in a first and second
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quadrature phase relationship with the C * signal is a quartz oscillator 122. Flip flop divider drain
(EndPage: 7diwidgrcLraix) 124, 126-operational amplifier 160 and 162. Field effect transistors
148 and 150. And amplifier 156.158. Balanced modulators 200, 202 are coupled to the first two
of amplifiers 112, 116. Each of the 3 rd matrix outputs co-respectively: these 1 s. Form means
for modulating the second subcarrier. The first subcarrier taken out of the amplifier 158 and fed
to the input terminal 172 is advanced by 90 degrees from the f′L taken out of the amplifier 156
and the terminal 176g = the second subcarrier fed. Balanced modulators 200, 202 are also each
one of the first. A means for suppressing $ 2 sub-carrier W is configured. The output of summer
208 is the sidebands of the modulated n first and second subcarriers. Et al are supplied to the
26-53 KHz band pass filter 210 and to the delay means 212. The 76 KHz output of the amplifier
154 constituting the sixth IiIl carrier is supplied to the input terminal 180i, the fourth matrix
output of the amplifier 120 is supplied to the input terminal 182, and the other is supplied to the
0 terminal. Controller 214c is connected. It is similar to the balanced modulator 200. 202
described above.
The two outputs n of the balanced modulator 214 are coupled to differential amplifiers. The
differential amplifier then forms, together with the transistor 222, limiting means 224 for
limiting the degree of modulation of the sixth subcarrier by the fourth matrix output to a
maximum value C2 below the other highest possible level. The function of this limiting means
224 is to determine the amplitude of the maximum output of the transistors 218, 220 according
to the bias level established by the variable resistor 225, the 76 KHz 3 out of band modulation to
prevent the out-of-band radiation is an undesirable high level C 2 か C C 二 制 限 制 限 制 限 制
限 制 限 制 限 制 限 制 限 制 限 制 限 制 限 制 限 制 限 制 限 制 限 制 限 Although the limiting
means will be a compressor I will. Most Effective &: To achieve this purpose the maximum degree
of modulation should be limited to the highest level of 60-90 qb available elsewhere. It has been
found that limiting approximately to a maximum value of 60 近似 results in many objectives ≦;
optimum C 2. Of course, there are many circuit arrangements that can be used to limit the degree
of modulation of the sixth subcarrier 0, eg, limiting the fourth matrix output before it is applied
to the balanced modulator 214. It would be possible to limit the sixth subcarrier to 1 as
important (5iPifieant) as K, not effective on the sound quality produced by V stem C 2 if 0 n
otherwise, definition of matrix output C: The degree of modulation according to the fourth matrix
output often exceeds the maximum value which is limited, and it is generally a short time when a
limitation occurs. The output of limiter 224 is applied to a 46 fez-76 KHz filter 228 which is
suppressed, ..., a relatively small portion of the sideband above the third subcarrier being
suppressed. Remove all but the top part of the lower sidebands. In order to create an energy
distribution, shown schematically as frequency band 42 in FIG. 1C, filter 228 has a low 4 (5 KHz
ji @ number of passes but lower a-wave bands. It should be noted that the single t = 611 Jzt =
extending is not exactly ◎ The transmitter 20 has one synthetic signal divided into two separate
stereophonic audio frequencies input according to the invention of the present invention Means
268 for generating a 76 KII z control signal indicating. This control signal generating means 238
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is similar to the pilot amplifier 184 and receives 76 KHz input from the connected Am line 240
through the line 242 k from the switch 248 gm.
And the line 242 is connected to the input terminal 180 ヲ balanced modulator 214C
sequentially. The output of the control signal generating means 268 is supplied by the line 244 &
the output of the additional delaying means 262 (at: node 2464). The switch 248 is ≦ 2 to
disconnect the control signal generating means 268. The four matrix outputs, the 19 ffz pilot
signal and the control signal are in one sense added to the broadcast signal, so their phase
relationship is critical to one another. If the proper phase relationship can not be maintained,
crosstalk between channels will occur. The second and sixth matrix output signal generators
increase the transit time to be equal to that of the $ 4 matrix output 0, since a complex path
through them has been added 1; Has the longest running time. EndPage: It is desirable to have 8
time 1-time equalization means 260, which receives the output of the filter 228-the function of 0
1-time equalization means 260 is an all-pass filter, Filter means 2281 Equalization means 260v
Equalize transit time signals of different frequencies to pass through 0 Zero-intelligent time delay
means 262 sympathize with the output of one equalization means 260 Given to provide fine
adjustment of time. The output of the additional time delay means 232 is fed to an adder 194,
whose function is to combine the four matrix outputs and the output of the zero adder 194.
Amplified by the transistor 250-two ordinary exciter 1: The source, where it is frequencymodulated by the transmitter 20, which modulates the frequency-modulated transmitter output
in a known manner Receiver 22 which has been designed to use the primary carrier C: No. 6.
Seventh. 8 and 9 straight; illustrative ≦; shown n こ の This receiver 22 is a common antenna 28
° high frequency amplifier 292. Mixer 294. The intermediate frequency amplifier 296, and this
circuit 1C, as described in detail, the 1M detector 298 has to be equipped with a speaker 60 In
order to reproduce four separate audio frequency inputs supplied by two sources, Regenerate the
second and third subcarriers and detect the four matrix outputs. Four matrixes, speech matrix
(dε- 屏 atriac) 1. なければならない。
Although the receiver 22 described here performs the functions of these: L is well suited, but as
with the transmitter 20, the receiver 22 has many within the scope of the inventive concept.
Change the page in a way. These functions may be appropriately ≦: 0. However, the receiver 22
is a part of a broadcasting system, and is specially designed to utilize a composite signal
generated by the cooperative transmitter 20; It must be done. Sixth. Seventh. 8 and 9; a portion
of the preferred receiver 22 shown is part of an integrated circuit design and detects four matrix
outputs by time division of the composite signal. These features of the receiver 22 are not
absolutely essential, and the four matrix outputs can be detected by more conventional tuning
circuits. However, such an arrangement does not provide many of the advantages of inductorless
integrated circuits useful for time division techniques. The signal from 1M detector 298 is
applied to input terminal 300 and passes through an amplifier (shown in FIG. 6: shown)
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containing transistors 302, 304, 308 and 308 to develop two separate signal channels. . This
configuration provides a signal to the integrated circuit for immediate use. A DC output is taken
from the transistor 306 by the line 310, and an AC out DC power is taken from the transistor
30g by the line 3 ''. Unwanted alternating current components are removed from the signal by
capacitor 314 before reaching the pace of transistor 306. The bias voltages generated in section
320 (shown in FIG. 6), which is a common arrangement, are utilized to provide the necessary
voltage levels to the various parts of the integrated path described below. Lines 310, 312 are
signals to the quadrature detector (q 塾 adrat word dmtmetsr) 326 (shown in FIG. 7) where the
signal is applied to the pace of the two transistors 328, 330 forming a differential amplifier. give.
This amplifier is connected to and driven by two pairs of transistors 332 and δ 334, 336 and
1338 which form a two pole, double throw switch. The state of this switch is determined by the
divider (fraqse * cydivider) i; Detector 326. Current control oscillator 348. The DC amplifier 35G
and the frequency divider 346 form a phase lock loop (phaselockad1 eap). The output of detector
326 is applied to the bases of transistors 352 and 354 which form a DC differential amplifier
350. The output of this amplifier 350 is thus converted from a voltage signal to a current signal
by the transistors 360, 362 'and then applied at the emitter of the transistor 363 to the EndPage:
9 current control oscillator 348.
Oscillator 348 is a modified emitter-coupled monostable multivibrator such that the charging
current is a function of the signal current applied through transistor 363 through capacitor 364
outside the integrated circuit. This current flows through diode 368 and parallel load resistor
376, transistor 378, capacitor 364 and transistor 372. This (a current of two forks is a diode 374
and a parallel load resistor 37G). It flows through capacitor 364 and transistor 380. Transistors
372 and 380 form a differential current switch that is responsive to the differential voltage
across transistors 371 and 378. Transistors 371 and 378 have cross-coupled collectors and
bases to provide the necessary feedback for monostable operation. The transistor voltage bias of
current controlled oscillator 348 is provided by line 386 from bias voltage generation portion
320. Free running frequency of oscillator 348 (/ rag? %% 11 & jfrmq% g% el) (approximate (= 16
KHz) is determined by the current. The output of the voltage controlled oscillator 348 taken from
the bases of the transistors 372 and 38G is a 75 KHz square wave applied to a pair of terminals
387 and 388. This is an input to the 1 divider 346. The splitter 346 comprises two modified
current mode logic, master slave flip flops (FF). A master-slave FF consisting of a pair of
transistors 392 and 394 and a pair of transistors 408 and 410 is elacked with a 75 KHz
oscillator 348 and 990 'to produce two phase 39f # z signals Thus, 's1. 1st. Create a carrier
wave. 311138 KHz sub-carrier line outputs @ 44B. It is taken out from 450. The second
subcarrier 38 KHz, which is behind the first by 90 degrees, is extracted from the pair of output
lines 458.degree. The transistor pair 412, 414 constitutes a gate switch means for gating the
master F 1392, 394, and the transistor pair 404, 406 constitutes a gate switch means for gating
the slave cages 408, 410. The output from the master FF is shifted to a DC level by transistor
resistor networks 396, 398, 400 and 397, 399, 401 driving output lines 458, 456.
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The DC level of the slave FF's output is left by the transistor network 407 ° 411, 409 and 412,
413, 415 which drives the output lines 448, 450. The transistor pair 389, 390 constitutes clock
switch means for driving the master slave IF from the oscillator 348. The second master slave jFF
is clocked from the 23174 KHz signal from the first master slave FF to produce two H) fJfz
signals in quadrature. The 119f # z signal is extracted from the pair of output lines 438 and 440.
The 's219f # z signal, which leads J1 by 90 degrees, is taken from a pair of output lines 434,
436. The operation of the second master slave FF including the gate switch means, the clock
switch means and the DC level shift means is identical to the first master slave FF. The 19 KHz
output is provided by output lines 434 and 436 (: by: transistors 334 and 332, respectively, of
detector 326 to complete the phase lock loop. One pair of output lines 438 and 440 supplies the
outputs of the FFs 430 and 432 to the bases of the transistors 542 and 544, 540 and 546 of the
19f # z / (slot detector 528 in FIG. FIG. 8 also shows means 442 for detecting the four matrix
outputs. The oscillator 348 (1) 75 KHz output is taken out from the output terminals 387 and
388 and supplied to a pair of input terminals 444 and 446 in the matrix output detection means
442. The 39 KHz first subcarrier generated by the FFs 408 and 410 is taken from the pair of
output terminals 448 and 450 of the splitter 346 and applied to the pair of input terminals 452
and 454 in the matrix output detector 442 (Reinserted). Similarly, the 39 KHz% 2 subcarrier
generated by J '7392, 394 delayed by 90 degrees from the output of FF 408, 410 is taken from
the pair of EndPage: 10 output terminals 456, 458 of the splitter 346, A pair of input terminals
460 ° 462 (two applied (reinserted) in the matrix output detection means 442). Thus, the
current control oscillator 348 forms a means for regenerating and reinserting the third
subcarrier which is 16 KHzH :. Minuteers 346 (DIFs 392, 394 and 408, 410) *, 1st in the 3 gffz.
A means is provided to regenerate and reinsert the second subcarrier.
Input terminals 452 and 454 g) A 36 KHz signal is applied to the gate consisting of transistors
464 and 466, and a 4-pole, double throw, double throw switch 468 is used to control time
division sampling of the composite signal. Operate. The combined signal is taken from the lines
322, 324 and applied to the pace of the two transistors 470, 472 by the two lines 469, 4701 =,
thereby forming a differential amplifier. In a similar manner, the late 3 ff-Hz signals from input
terminals 460 and 462 are applied to gate 474 which operates a two pole, double throw switch
476 to control the sampling of the signal applied to differential amplifier 478. . Gate 480
operates a two pole, double throw switch 482 which controls sampling from terminals 444, 446.
In this way, the signal is sampled for an appropriate time (::, given four matrix outputs as the
outputs of the swings 468, 476 and 482. The switch outputs include four transistors 488, which
divide each output of switch 468 into two outputs, four transistors 490, which divide each of the
two outputs of transistor 476 into two outputs, and a switch 482, respectively. A de-matrix
means 486 consisting of four transistors 492 is applied which divides the output into two
outputs. The outputs of the transistors 488, 490 and 492 have four output terminals 494 and
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496. At 498 and 500, the matrix outputs giving the original four audio frequencies human power
Ly, Lm, Ry, Rx are connected together to add and subtract. Reception @ 22 further comprises
means 528 (FIG. 8 (shown)) for detecting the presence of the 19 KHz pilot signal 43, which is
applied to the differential amplifiers 548, 550 (': thus: Four transistors 540, 542 arranged to
form a two pole, double throw switch to sample the signal. 544 and 546 are included. The switch
is operated at 19 KHz (9 ratio) by the 19 ffz signal from the splitter 346 so that the 19 KHz pilot
signal in the composite signal is detected and the DC voltage proportional to the amplitude of the
19 f # z pilot is two resistors 552 , 554 and the variable resistor 556. Capacitor 558 filters the
AC signal between these resistors. The resistors 552, 554 and 556, of course, are external
components with respect to the integrated circuit of the receiver ai 122.
The voltage drop across the arrangement of resistors 552, 564, 556 and capacitor 558 is
proportional to the amplitude of the 19 KHz pilot signal 43. This voltage drop is applied to
differential DC amplifier 562 and to differential amplifier 564 which includes one pair of
transistors 566 and 568. The transistor 568 has a fixed voltage level that is applied to a resistive
voltage divider (γazsziar-diwid * r) 570e572 <: Jo's "C" 17). Thus, if amplified by detector 528
and DC amplifier 562 E, if the level of pilot 43 in the combined signal is higher than the dark
value determined by resistive divider 570, 572, then transistor 568 through resistor 561. The
transistor 566 is tuned and the transistor 568 is detuned by the regeneration action of the
transistor 564 connected to the pace of the transistor 566 of the When transistor 568 is
detuned, the voltage level at its collector rises, increasing the voltage level applied as feedback to
the pace of transistor 566 kept in tune. Conduction of the transistor 566 causes current to flow
to the transistor 576, increasing the voltage between the resistor 578 and forward biasing the
transistor 580 and the other transistor 582. Transistor j 582 operates a ramp 584 giving an
indication, 15 "indicating that the Igffz pilot is being received," indicating that it is strong enough
to reproduce two stereo channels. EndPage: The current that forward biases the 11 transistor
576 also forward biases the transistor 586. The collector current from this transistor is then fed
to the transistor 388, which will turn off if the pilot signal level is not high enough for 2f Yannel
reception, so that the appropriate part of the receiver @ 22 (FF 464, 466) )). The receiver 22
optionally includes switching means 6 o O (丞 y in FIG. 9), which is responsive to the presence of
the control signal 44 at 76 KHz in the composite signal. The function of the switching means 60G
is to provide an indication by means of a funpro 02 indicating the presence of four audio
frequency inputs. The switching means 600 is also arranged to disconnect part of the receiver 22
at the matrix output detector 442 when the display signal 44 is not present.
This part of the receiver 22 is a gate 48G (Knee controlled amplifier 484) which detects an
amplifier 478 controlled by a gate 474 which detects the 's4 matrix output and the s3 matrix. A
gate 48 is provided by a terminated line 604 connected to the rectifier. Switching means 600 is
similar to 19r # z pilot detector 52g (shown in FIG. 88), and transistor 606 and lamp 602 are
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operated in the same manner as transistor 586 and lamp 584. The 76 KHX control signal
indicates that four audio inputs can be extracted from the combined signal, so the lamp 602 is
fired and the transistor 606 is tuned only if it has sufficient amplitude. A switch 636 is provided
to connect the line 604 to ground so that the amplifiers 478, 484 can be manually disconnected.
Of course, the switching means 6oo is useful only if the weakened 79 KHz third subcarrier is not
suppressed but is only weak and transmitted to provide a control signal. The broadcast V-stem
described above provides transmission of a broadcast signal that includes audio frequency inputs
in four separate stereophonic relationships. This signal conforms to the standard (= standard
established method for 2-channel stereo FM broadcasting) and is completely compatible with the
existing monophonic and 2-channel stereo equipment. Although modulation at the transmitter
has been described in terms of suppressed carrier amplitude modulation, the generated signal is
essentially similar to the signal generated by AC channel time sampling considered equivalent
technology It is well known. Similarly ::, the two methods are internally modifiable at the receiver.
The embodiments are as follows.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 schematically shows the base band of the
synthesized signal used to modulate the main carrier transmitted and received according to the
present invention, and FIG. 2 shows the present invention according to the present invention. Fig.
6 is a pictorial representation of the broadcast system configured. Figures 3 @, 3h, 4 @, 44, 5a
and tF5bWJ # t, diagrammatically showing part of the transmitter which is part of the system of
FIG. 2, 3m 6, 7 8 and 9 FIG. 112 schematically illustrates a portion of a receiver that is part of
the system of FIG. Patent applicant General Elektrak Company Agent Patent Attorney Tamaku
Five Section EndPage: 134 List of attached documents; (I) 9I-no,-I amended procedure
(spontaneous)-October 1 '1 1 1 E1, title of the invention-title of the invention-channel 4-channel
stereo sound system Person address □ United States of America New York State 12305 Revere
6-No. 1 Name General Electric Company Representative Andon ・ Jie ・ Will Basic Etc. F / To,
Fig, 3 σ End Page: 19 Warning: Page
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