JPS53123901

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DESCRIPTION JPS53123901
Specification I Title of Invention
Speaker augmentation 1 device device for car stereo
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker
expansion device for a two-channel car stereo in a car room. In general, speakers for car stereos
are mainly composed of a rear two-speaker system which is installed one by one on the left and
right in rear parcill ton etc. behind the seat in the car room of its own. However, in addition to
this speaker, there are many cars with a single speaker for mono car radio installed near the dash
board in front of the seat. Therefore, there is a speaker expansion device for Tsuka stereo in
order to richly reproduce the realism of eight speakers by using the front radio speaker at the
time of car stereo reproduction. However, in this case, switching between the reproduction of the
car stereo and the reproduction of the mono car radio was troublesome, and it was possible to
reproduce only from the conventional front speaker in the reproduction of the uneasy car radio.
Therefore, the present invention solves the above-mentioned various drawbacks, and enables
simple operation to a car stereo or a car radio with one switch operation, and further reproduces
a monaural car radio with three speakers. It is an object of the present invention to provide a
speaker expansion device for a car stereo. Next, the details of the present invention will be
described with reference to the attached drawings. FIG. 1 is a basic circuit block diagram of the
present invention, wherein the changeover switch 1 is used to supply power to the stereo
amplifier A and power to the radio amplifier B. It is what changes. The terminals of the left
speaker C and the right speaker D for stereo are connected to both terminals of the radio speaker
E, respectively. It is possible to switch between the left and right outputs and the output of the
radio amplifier B. The changeover switch 4 can be switched to the e terminal side of the radio
speaker E, the right output circuit of the stereo amplifier A, and the white output of the radio
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amplifier B. The punishment and changeover switch 2.8.4 are both operated in conjunction with
the changeover switch 1. FIG. 2 is a circuit diagram showing a first embodiment of the present
invention, in which left and right output attenuation circuits F and G each comprising a resistor
are inserted in the left and right speaker circuits of FIG. That is, interlocked rotary switches
5.67.8 are provided as left and right output attenuation circuits F and G of the amplifier so that
the outputs of the left and right stereos or the outputs of the radios are connected to the
respective movable contact sides. The terminals of the left and right speakers C1D are connected
to the middle contacts of .6, and the e terminal of the radio speaker E is connected to the middle
contacts of the rotary switch 7 which is a small size.
The e terminal of the radio speaker E is switched to the middle contact of the rotary switch 8 or
the e output side of the radio amplifier B by the changeover switch 4. In addition, fixed resistors
9.10.11.12 are respectively attached to the left side contact from the middle contact of the rotary
switch 5.6, and the middle contact and the right side contact are connected resistancelessly with
each other. And, conversely to the above, the left side of the middle contact of the rotary switch
7.8 is connected with each other without resistance (5), and the right side thereof is attached
with the fixed resistor 13.14.15.16. Next, the coil side of the electromagnetic relay 17 having a
three-contact circuit is connected to the power supply circuit of the radio amplifier B of the
changeover switch 1, and the three-contact circuit is connected to the changeover switch 2.3.4. It
was used in a close manner. FIG. 3 shows the main part of the second embodiment. In the first
embodiment, depending on the position of the actuating contact of the changeover switch 1,
either the power source of the stereo amplifier A or the radio amplifier B can be used. No, the
user must keep track of this contact level. Therefore, a pilot lamp is inserted in the power supply
circuit in order to make it very easy to check whether the operating contact position of the
changeover switch 1 is on the stereo side or the radio side. In FIG. 3, a light bulb 18 is inserted as
a pilot lamp in a radio power supply circuit, and in FIG. 4, a light emitting diode 19. 20 is used in
both radio and stereo power supply circuits. The present invention is configured as described
above / A1 <. Next, the operation of (6) EndPage: 2 will be described. In FIG. 2, when the
changeover switch 1 is in the position as shown in the figure, that is, when the power source B of
B is connected to the power supply side of the stereo amplifier person, the electromagnetic relay
17 is not made and hence the changeover switch 2.3. The 4.0 contacts are connected to the
positions shown in the figure. Now, assuming that the knob of the rotary switch is in the middle,
that is, if the movable contact is at the position of the middle contact as shown in the figure, both
the output of the stereo amplifier A and the terminals of the left and right speakers C and D and
the radio speakers It is directly connected to both terminals of E, and eight speakers are driven at
maximum output respectively. Next, assuming that the knob of the rotary slide is turned to the
left, the rotary switch 5.6 supplies stereo output to the left and right speakers C, D through the
left and right fixed resistors 9, 0 or 11.12 respectively. 1.
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The volume of the left and right speakers C and D decreases as it rotates further to the left while
the left side of the rotary switch 7.8 connected to the geo-speaker E is connected with each other
in a non-resistive manner to drive the beaker E. It becomes. Next, when the knob of the rotary
switch is turned to the right from the middle contact position, the low-cramble switch 5.6
supplies no resistance and supplies stereo output to the left and right speakers CD and the rotary
switch 7.8 has fixed resistance. The stereo output is to be supplied to both terminals of the radio
speaker E through the units [3], [4], 15. 16 and only the volume of the radio speaker E is
reduced. Next, when changeover switch 1 is switched to the opposite position as shown in the
figure, that is, when the power supply of B is switched to the power supply side of radio amplifier
B, the power supply to stereo amplifier A is turned off and the power supply circuit to radio
amplifier B is turned on. It becomes. Therefore, the current flows through the coil of the
electromagnetic relay 17 connected to the radio amplifier power supply circuit to operate, and
the 8-contact circuit, that is, the changeover switch 2.3.4 is switched to the opposite position to
the figure. Therefore, the speaker circuit is turned off from the left and right stereo e outputs,
and is connected to the radio amplifier B's e output. Also, the e terminal side of the radio speaker
E is turned off from the right speaker -D on the stereo side and the right output, and is connected
to the θ output of the radio amplifier B, that is, grounded, and the monaural radio amplifier B
Three speakers will be driven simultaneously. At this time, the volume control of the rear left and
right speakers C and D and the front radio speaker E is made possible by the rotary switch 5.6.7.
In FIG. 3, when the contact position of the changeover switch 1 is switched to the radio power
supply side, the light bulb 18 is turned on as a pilot lamp, and the user is surely notified that
switching is to the radio side. Also, in FIG. 41, a light emitting diode as a pilot lamp, 20, operates
to notify. In addition, since it is also attached to the stereo side, the division of the switching
position becomes more reliable. According to the present invention, as described above, the car
stereo and the car radio can be easily switched by one operation of the B power switch 1. (9) The
car stereo has two rear speakers 2 In addition to the channel, the front radio speaker works as a
matrix 3 channel, so the present invention can be particularly narrow because the monaural
radio can be played back by the front and back 3 speakers together with the vine 7 with full
presence feeling In the room, it provides a very excellent sound field expansion effect.
Furthermore, the use of a radio speaker as the front speaker is also extremely economical. In
addition, the pilot lamp for confirming the position of the power switch of B, which is easy to
confirm whether it is the stereo side or the radio side, has an aesthetic appearance due to the use
of the lamp, and there is no malfunction and it is convenient in use. ■ Simple 11 of the drawing1 theory! 1 is a basic circuit diagram small 2 Figure 1 shows the first embodiment of the circuit
diagram Figure 3 is a circuit diagram showing the main part of the second embodiment 4 Figure
is a recess of the third embodiment Circuit configuration shown (10) EndPage: 3A-stereo
amplifier E · · · radio speaker B · · radio amplifier F · · right output attenuation circuit C · · · right
speaker-G · · left output attenuation circuit D · · left speaker ■ · · · Changeover switch 9 · · · Fixed
resistor 2, / / 10 · · · · · · · · · · · · · · · · · · · · · · · · 12 rotary switch 13 · · · / 6-t14 · · · · · · · · · · · · · · · · · · · ·
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· · · Patent applicants 1) Jiri 1) ((11) EndPage : 4
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