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Address Osaka 22 Abeno-ku Nagaikecho No.22 Name C504) Sharp Corporation 4 Representative
Saeki Asahi 4 Agent Address Cloudy 545 Osaka-shi Abeno-ku Nagaikecho No.22-Sharp
Corporation Internal Telephone Osaka (621) 1221 ( 1) 1 specification (2) 1 drawing (3) proxy
letter 1-Japan Patent Office 0 JP-A-51-390140 published Japanese Patent Application 51. (1976)
4.1 Internal reference number 1, description of invention
Noise reduction method
3. Detailed explanation of the invention The book 9 is a tape recorder to be played on a tape
recorder (') various /' 7: (eg hiss noise, multipass noise, space noise, etc.) The noise is low,
especially threatening noise or easy-to-ear noise. The above various noises are to be processed by
performing monotonous reproduction. 0 Follow-up as a method to reduce noise in recording
tape. Takasaka cut filter, that is, high my cut and noise reduction when it comes between songs
■ ■ Gain control times @ reduce the output level of song f [f f, or ■ there is no sword with the
above high-cut filter The difference between the recording signal and the noise level is constant
and the bell below vc and the level of the treble range is raised and recorded, and the upper part
of the treble range is lowered during playback. If the noise component is low in the case of a high
frequency cut filter with a low frequency component, the wave number characteristic is flat and
there is a corner that lowers the high range at the time of noise and reproduction at a certain
level. There is no effect, and the sound level changes by dropping the output level in case of gain
control, and in the case of 8 if the 8 / N ratio of the tape vc recording source (eg tuner, player or
other) is bad No noise reduction EndPage: If there is no effect, and a tape I / l @ is sounded from
a record or the like, it is not negative to reduce it by the noise 1 contained in the record. ! 1 is an
improvement over the above-mentioned disadvantages 1 Detailed description of one embodiment
of the present invention will be given in detail in accordance with the drawings FIG. 1 is a noise
reduction system σ) block diadram shown in FIG. gI) r-7'deck, finish 2 from tapedeck, playback
amplifier to increase chipping, 5 noise reduction circuit according to the present invention, left
and right channels from tapedeck to 4 ° and i '4F 0 second factor is a block reduction loop of
the attenuation reduction circuit, which is both left and right from the tapedeck, both H channel
signals are blended in Matrices 1 path 11 <a)? , The audio signal of the sum of the output vcn, +
H is output, and the audio signal of the L + H phase is amplified by the amplifier 12 and the
amplified audio signal Ji +! The 1st roll i path 15 is to make the work roll [1 @ 16Q stereo or
mono playback work]. FIG. 6 is a diagram showing a specific noise reduction (a block diagram of
one path of the mouth). In the figure, the 228 (L, R) 2-channel signal from Chevitchi is applied to
the amplifier (2 of '@ 1') at the same time as the left and right of the noise reduction circuit 5, the
H input terminal AB [is also added, Reproduction of this R (right) and L (left) @ Ji + (* is the
headphone output) Fi R1 On and It C1?
Blended (synthesized) with each other via l '! The voice signal of the sum of fAfR + L is obtained.
The voice signal 8 of the sum of R + L is appropriately level-adjusted by the volume VR1, and the
transistors Q, Q, rcx are amplified. This volume vB is a control volume for a noise low M
(operation start level of the jjr path), and is rectified and smoothed by a diode p of the II path, ap,
Ilt and the capacitor C1. 9r shares will be taken out 2. Is a series diode for keeping the selfcurrent voltage level constant giving a base bias to the transistor Q, QSw as a #: t * f low [喰] path
11 operation (ON) or no operation (OFF) It is a subaru to do. Therefore, one circuit is made as a
noise low humidity circuit when it is in the on position, and when it is in the off position, the
power supply (eB, resistance R, resistance, C'7 ball, C'7 ball is always Kator Oonide7. Current
flows, transistor Qm? I-Always follow eK 0 0, J: 涜 [oi path small output 9 points I flow signal is a
time constant -1 M consisting of gate anti Rs and charge and discharge capacitor C6? M is added
to the base of transistor Q, The time constant ri of this time constant 1 pl route-normal point of
sound-break 'Eli is long, tune 1%! The voice signal converted into the above 0 area selected to be
shorter than 5 charges the capacitor ρ · 會, and makes one transistor Q41′′4 forward 7 <Ias,
turning on the transistor Q and 會; That's a tape tape, that is, the playback signal from the tape is
obtained! 4, transistor Q, tj turns on, one point σ)-11 '* EE, (collector voltage of-) IJ 17 VR VR, 會
4: 、, W-Over adjustment, the miso zero potential In this case 0 can be diode D, and Da11 reverse
10,000 times (Iasu and Cali, the sunbi dance between PH is more than a few megohms (MΩ),
this noise low '#, circuit output terminals P and 0 Between the transmission paths of the left and
right channel outputs of the tape deck 1 shown in FIG. 4 (1), the high-Sumbi dance 2 is inserted,
so that the output signal of the tape deck 1 can be completely isolated. lc recording f When the
signal on the tape can not be obtained or when it is between songs, there is no @ sign that is in
the (transistor Q, 1) base input as described above, and the tiger 7 is a transistor Q. Transistor Q,
the collector position of transistor Q, voltage E at point E rising at ON point electron elevation D,
D4, D4 is negative forward (B), diode D 訃 D4 c is a lump The pig output terminal P-Q, the
capacitor C @, and the capacitor 06 are valved to form a short circuit (FIG. 4 (i), the zero or no
signal for seven aural reproduction, or the meter q at a time) ) Runout will be zero, so check
visually with a meter and check EndPage: 2 can be done □, diode D ** D4ri output impedance
large # (channel separation at LJ birth y py 1x-waste Became.
コンチン? C, beam, it is a signal gap that is more prominent than the R channel, channel
separation sound is longer, the value of the capacitor C6 is also used to cut the high range
between songs, and therefore it is possible to use a tape from σJ @ No eclipse, ie the output
signal from the tape eclipse, eclipse, re-diode D ,. D、? Cut off and insert a high impedance
between both channels and separate the signal (Side re-tf, do not get out of the tape when there
is no signal or between tracks, the above diode I), I) , TJIIJi, insert one into a capacitor (c, + C @)
between both separations to make 7 / − ral reset, and noise contained in @ source (even to i :::::
Fi multi Pass noise, space) l's) and tape # 'i: i hi x / J x 2 Multi-Bayu, noise "Jul-ju-lul" and other
noises of the tape Hiss ヒ noise · Level error is large When these noises are canceled as follows
Generally, the signal noise (contamination noise on the broadcasting station side, spatial noise ,
Multi-noise), and histo noise etc. of the magnetic tape are controlled by the 7M multiplex
demodulation circuit, and increased by separating into H stereo signal 4 + (generally 18 to 20
dB). The noise components are in opposite phase to each other, and therefore can be canceled by
noise components of mutually bK opposite phase by blending (synthesizing) both channels (L, R).
FIG. 4 shows an equivalent circuit of the noise reduction circuit of the present invention. Fig. 4
(b) shows the case of ordinary stereo reproduction in the case of seven aural reproduction at the
time of no signal detection between aa 9 (a) tSt songs or Fig. 4 (b) shows the appearance of tape
deck 1 at the time of inter-piece detection. Terminal PQ, capacitor c8 in the dark. The dentition
capacity C or inserted Vc first, raw high frequency noise mutually as both channels F F [fi 7,
especially S / N ratio σ) worse than 1 between 1 or S signal If you want to make seven norals
reminiscent f? It is possible to make the low m large. 10,000, the signal obtained from the tape
(song) It is playing during playback. Ri, the output terminal P-Q of the tape data P1 is inserted
between the high heights and the separation between 7L and R channels is complete. It is
intended to be As shown in FIG. 1r5 in the capacitors C8 and C9 described above, the discharge
current of the capacitor C9 (when the capacitor Cs is charged) flows through the diodes D, D and
The length of 7 n-aural playback time between songs on the tape can not be selected largely. The
value of L can not be selected L L7)-The value of capacitor C9 can be large but the example of 2
channel stereo playback can be performed. However, what can be done with 4-channel or multichannel stereo reproduction is of course how you can do it on 01 叙 (water valve I! 1) Re-'4 E
communication 8 from the tape is obtained-at the time of stereo reproduction where both
channels are π high interference r inserted between the two channels and separation separation
between the channels and separation separation between the channels,-from the sword tape σ)
Is it a capacitor between two thousand channels when no signal or song can not be obtained
from the playback signal? Since it is made to be inserted and processed into seven aural
reproductions, there is an effect that it is possible to reduce L (a signal source noise at the time of
no signal, a table noise, etc.) between two pieces of music.
4. Brief description of the drawings @ 1 shows the noise reduction system σ] of the present
invention-a block diagram showing an example of a harmful example, FIG. 2 shows a noise
reduction of one embodiment used in the same system as the above 1 system, Same as 3 [F] on
the low noise circuit of the low noise traveling circuit. FIG. 4 shows an equivalent circuit r of the
above system. In the figure, 1: tape deck 2: reproduction amplifier (amplifier) 5: noise low Q ml
path 4 '= reproduction speaker 11: matrix circuit 12: amplifier 15: rectifier circuit 14: time
constant 11 path 15: switch EndPage: 3
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