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1 MM book 1 name of invention
3. Detailed Description of the Invention The present invention is an automobile for which auto
radio and car stereo switching are properly performed by combining an auto radio with 27 amps,
a car stereo with four speakers and two amps in front, rear, left and right. It relates to an audio
system. It is conventional practice to add a car stereo to an autoradio so that both the autoradio
and the car stereo can be enjoyed, and various combinations of auto radio amplifiers, speakers
and car stereo or their selective use. Has been devised. For example, the radio section is made up
of 2 amps and 4 speakers, and 2 Ang car stereos are added to make it 4 amps and 4 speakers, or
the radio section is made up of 47 amps and 4 speakers, and 2 ans car stereo is added to this to
make a stereo In this case, the above four speakers are driven by the two angs, and so on are two
examples. The problem with such a case is that there is play in the parts of EndPage: 1. For
example, in the latter case, in the case of stereo, four amplifiers in the radio section are not used.
Also, in the multi-speaker system such as 4-speaker, it is necessary to balance the front and rear,
right and left, and its adjusters (left and right balance, front and rear fader) are provided. In order
to adjust the volume of the front and rear speakers, it is necessary to set the radio fader in the
case of a radio or rA in the case of a stereo. The occurrence of duplication of functions and
idleness between the auto radio and the car stereo in this way not only reduces the operability of
the user, but also has the drawback of causing an increase in cost. The present invention has
been made in view of the above points, and it is a combination of a 2-amplifier autoradio, a 4speaker and a 2-amplifier car stereo, 27 radios with 4 radios, and 3 stereos with these radios. All
amplifiers and speakers are used as 4 amplifiers and 4 speakers. Furthermore, front / rear
balance of front and rear speakers when using a single radio and front / rear balance of front and
rear speakers when using car stereo can be adjusted with faders always provided in the auto
radio section It is an object of the present invention to provide an audio system with improved
operability and cost reduction.
Hereinafter, the present invention will be described in detail with reference to an embodiment
shown in the drawings. In the figure, 1 is an auto radio (car radio receiver), 2 is a car stereo (car
cassette tape player) additionally connected to it, ANT is a receiving antenna, FL is a left front
speaker, and BL is a left rear The speaker, PR is a front right speaker, and BR is a rear right
speaker. Of the signals selected and received and demodulated by the auto radio 1 channel 11,
the left channel audio signal SLl is led to the left channel level adjustment polyneim 13L through
the left tone control circuit 12L, and at the same time the right channel audio The signal 8R + is
led to the right channel level adjusting polymime 13m through the right tone control circuit
12m. A volume 14 connected in parallel between the output terminals of the tone control circuit
12c + 121 and having a slider grounded is a balancer for adjusting the volume ratio (left-right
balance) all of the speakers FL (BL) and FR (BR). The sliders 13i and 13 'are connected to the
input ends of two power amplifiers 15L 115m. The output terminal of the left channel power
amplifier 15L (the output terminal on the high potential side because this amplifier is a BTL
connection) L One of the variable resistors (faders) 16a of the fader control 16 having 12
variable resistors 16a and 16b Connected to One end of the fader 16m is connected to one end
of the drive coil of the left front speaker FL, and the other end of the variable resistance portion
16m is connected to one end of the drive coil of the left rear speaker BL via the switching contact
17a of the switching portion 17. Ru. The other end of the drive coil of the speaker FL is directly
connected to the low potential output end of the power amplifier 15L, and the other end of the
drive coil of the speaker BL is connected to the low potential output end via the switching contact
17b. The other fader 16b changes the attenuation amount in conjunction with the fader 16aK. In
each of these faders 16a and 16b, a pair of sliders are connected in common at a certain angle,
and when the rotation axis is at the center position, each pair of sliders is fixed at the center with
conductor portions at both ends. It is located at both ends of the resistor part, so that the
attenuation of the branch paths to the two speakers is both zero. Then, when the rotation axis is
rotated in one direction, the attenuation amount of one of the branch paths is increased, and the
attenuation lid of the other branch path is maintained at zero. The fader 16b of the fader control
16 is controlled by the variable resistance portion 16m to balance the front and rear of the auto
radio 1 driven speakers FL and BL.
The above-described fader control 16 and switching unit 17 have the right channel power
amplifier 151 and the speakers FR, BR. ! Although it also intervenes in the relation of:, since the
configuration is completely the same, it is omitted in the drawing. Note that the operation axis of
the fader control provided at the power amplifier output end of the right channel is linked to that
of the left channel, and the fader control may be either left or part including O tone control
circuits 12L and 12i + from EndPage External connection terminals 19+ and 19m led to the
outside from the external connection terminals 18L and j8R led to the outside and the sliders of
the volumes 13L and 13R are the second external connection terminals 21L and 21m for the カ
ー ス テ レ レ, respectively. Corresponds to 22L, 22mK, both are connected at the time of stereo
installation. Further, the external connection terminal 20 'derived from the sliding end of the 7
ader 16b and the external connection terminal 20b derived from the other fixed terminal of the
switching contact 17b correspond to the external connection terminals 25g and 25b of the
cassette 2, respectively. , Stereo attached at the time of installation. The second left and right
channel reproducing heads 24L and 24m of the caster are connected to the external connection
terminals 21t and 21m via the equalizer 25. The 26 and 26 wings are a left channel power
amplifier and a right channel power amplifier on the car stereo side, and their input ends are
connected to the external connection terminal 22L122xK. The output end (high potential m1ll) of
the power amplifier 26L is connected to the external connection terminal 26 &, and the low
potential side is connected to the external connection terminal 23b. The same applies to the
power amplifier 26 blade, but the illustration is omitted as described above. The illustrated state
is when the auto radio alone is used, and the left channel signal SL + from the tuner 11 is
amplified by the power channel / '15L and then distributed to the speakers FL and BL by the 7
ader L6a. Similarly, in the right channel signal picker system, the left / right balance of the left
channel can be adjusted by operating the rotation axis of the fader control 16 to move its 7 ader
16 a (the fader 16 b also moves simultaneously but is invalid in this case) It is. The volume
balance of the left and right speakers is the balancer 14, and the volume adjustment of the left
and the right speaker is volume 13 L, 1! Next, the case of stereo performance with four
amplifiers and four speakers will be described. In this case, the power supply of the auto radio
1's TU is turned off, and instead, the second car power is turned on. Further, the contacts 17a
and 171) of the switching unit 17 are switched to the side opposite to the illustrated state.
This switching is automatically performed by mounting a cassette or the like. By switching, the
left channel audio signal SL from the equalizer 25 and the right channel audio signal Sat are
respectively led to the tone control circuits 12L and 121, and the output of the volume 13L is to
the power amplifiers 15L and 26L and the output of the volume 13B is It is led to the power
amplifier 151.261. In addition, the output of the amplifier 15L is led only to the speaker FL
through the 7 ader 16a by the contact 17a of the switching s17, and the output of the amplifier
26L is led only to the speaker BL through the fader 16b and the contact 17m. Furthermore, the
outputs of the 15 m, 26 wings are likewise led individually to the loudspeakers FR, BR. In such a
47-amp 4-speaker system, as described above, the power supply of the channel 11 is turned off
when the cassette pack is inserted, and the tone control circuit 12L. The human power of 12R is
the signal SL from Carster 2nd! ,island! On the contrary, when the cassette pack is discharged,
the power of the equalizer 25 is cut off, and the tone control circuits 12b and 12a have only the
signal 814rSR + from the tuner 11. In any case, one source of power A 7 ′ ′ 15 L, 15 H is
turned on, and from the four speakers FL, BL, PR, BR, the tape reproduction amplified by the
respective amplifiers 15 i, 15 K, 26 L, 26 wings Sound is emitted. Even at the time of this 4 amps
4 speakers, it is adjusted with the speaker FL, (FR) and BI, (BR) volume ratio (front and rear
balance) fader control 16 of the company. That is, when the contacts 17m and 17b are switched
to the reverse of the illustrated state, only the speaker FL side (upper side in the drawing) of the
pair of sliders of the 紘 fader 16m is effective, and the pair of sliders of the fader 16b Is valid
only at the contact 17a side (lower side in the figure). Then, since both effective sliders move in
the same direction on the common rotation axis, if the amount of attenuation between the
amplifier 15t and the speaker FL increases (decreases), the amount between the amplifier 26L
and the speaker BL increases accordingly. The amount of attenuation decreases (increases). Thus,
the front-rear balance is adjusted in the same manner as in the 27-amp 4-speaker system. The
left, right balance and volume adjustments are exactly the same as at radio. The audio system
according to the present invention described above can reduce the cost of the audio system
because it does not have EndPage: 3 such as function balance, volume control, 7 ada etc.
overlapping with the auto radio on the car stereo side. Because the user can always adjust the
system characteristics including the front / back balance with the operation knob on the auto
radio side regardless of the 27 amp 2 speaker system or 4 amplifier 4 speaker system, the
operability declines due to the addition of the car stereo There is no advantage at all.
In addition, when attaching an auto 2 geo and a car stereo at the same time, when an idle part is
generated, the knob of the part is removed to eliminate the shakyness, but in this case the cover
is exposed because the operation axis is exposed. Although extra processing such as provision is
required, it is needless to say that the present invention does not take out idle parts and does not
require processing. .
4. Brief Description of the Drawings The drawing is a system configuration diagram showing an
embodiment of the present invention. DESCRIPTION OF SYMBOLS 1 ... Auto radio, 2 ... Car stereo,
ANT -... receiving antenna, PL, FR, ilL, BB ... Speaker, 15L, 15 凰, 26L, 26m ... Power amplifier, 1'6
● •• Fader control film-16 m. 16b-variable resistance unit, 17 ... switching unit, 24. 24L ...
playback head, 25φ · · · Equalizer applicant Fujitsu Ten Ltd. (TL or 1 person) agent patent
attorney Atsushi Aoyagi EndPage: 4