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JPS57131090

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DESCRIPTION JPS57131090
BRIEF DESCRIPTION OF THE DRAWINGS The illustrated circuit is one embodiment of the control
circuit of the present invention. Description of main-da number, 3 иии first amplification circuit, 4
иии second amplification circuit, 7 иии head front jack, 10.11 и и и и и и и и и Negative feedback circuit, 12
и и и 1st control switch, 13 и и и и 2nd control switch, 16 и и и и и 1st sound field expansion circuit, 19 и
и и иии Second sound field enlargement circuit, 18 и и и First selection switch, 21 и и и и и Second
selection switch.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control circuit of
an audio device, that is, a stereophonic audio device having left and right channels. Hate '! ??
H. Near, an audio device called a tape recorder with a radio in which a radio receiver and a tape
recorder are combined is popularized, or a large number of such audio devices (a stereo type
having left and right channels). In the case of the portable type acoustic device, it is difficult to
obtain good stereo feeling because the distance between the left and right speakers is narrow,
and such an acoustic device expands the sound field expanding circuit which electrically expands
the left and right sound fields. Have. As such a sound field expansion circuit, it is common to
change the phase of the signals of the left and right channels and add them to the other channel
773. Although such a system can be easily configured, it has a drawback that the central sound is
missed, and in particular, when listening to music by turning on the head 7, it gives the listener a
very unnatural feeling. The present invention has been made in view of the foregoing points, and
will be described in detail with reference to the illustrated embodiments. In the circuit shown, (1)
and (2) are input terminals to which left and right signals such as reproduction signals from the
tailor recorder are input), (3) and (4) are the input terminals) and (2) First and second
amplification circuits for amplifying a signal input from the left and right speakers connected as
loads of the first amplification circuit (3) and the second amplification circuit (4) (5) and (6) , (7)
is a stereo head-on plug or a head-on jack to be inserted, and is configured to cut off the signal
supply path to the speakers (5) and (6) when the head 7 on-plug is inserted. There is. (8) and (9)
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are first and second feedback circuits connected in the negative feedback circuit section and
(company) to determine the gains of the first amplifier circuit (3) and the second amplifier circuit
(4) It is resistance. 1 and 784 and ?3 are first and second control switches that are opened
when the head-on plug is inserted into the headphone jack (7), and a? and ?9 are the first
control switches ? and 2 The third and fourth feedback resistors are connected in parallel to the
second feedback resistor (9) and the first feedback resistor (8) when the control switch a3 is in
the open state. ?e is a first sound field expansion circuit connected between the output terminal
of the first amplifier circuit (3) and the negative feedback circuit ?? of the second amplifier
circuit (4), and the resistance ?? and the sound field expansion operation It is configured by a
time-limited port 1 selection switch ?. Ql is a second sound field expansion circuit connected
between the output terminal of the second amplifier circuit (4) and the negative feedback circuit
?G of the first amplifier circuit (3), and includes a resistor (company) and a sound field
expansion It is comprised of a second selection switch (2) which is closed at the time of
operation.
The present invention is configured as described above, and the operation will be described next.
In the illustrated state, the first control switch and the second selection switch (company) are
opened and the first sound field expansion circuit aQ and the second sound field expansion
circuit ?S are in the inoperative state. In such a state, the reproduction signal 795 or the like of
the tape recorder input to the input terminals (1) and (2) is amplified by the first amplifier circuit
(3) and the second amplifier circuit (4) and then the speaker ( 5) and (6) are applied and emitted.
In such a state, since the sound field expansion circuits ? and a9 do not operate, a good stereo
feeling can not be obtained by the sound emission of the speakers (5) and (6). If a reproduction
signal or the like which is an output signal of the amplifier circuit +31 + 41 is listened to by
inserting the head in 7) and the head is turned on, it is possible to obtain a good sense of
stability). In addition, since the first control switch @) and the second control switch ?3 are open
in the state of listening with such a head type, the third feedback resistance a? and the fourth
feedback resistance ?9 are negative feedback circuits ?? and (1G It is in a more disconnected
state. Therefore, the gain of the first amplifier circuit (3) and the second amplifier circuit (4) is
reduced to seven as compared with the speaker (51 (the signal emitted by the A signal of an
appropriate level is applied and turned on. Closing the first control switch @ 1 and the second
selection switch (company) while listening to the reproduction signal etc. by the speaker + 51 +
61 activates the first child field 806 enlargement circuit +161 and the second sound field
enlargement circuit It will be in the state. When the first sound field expansion circuit ?e and
the second sound field expansion circuit ?l are activated, phase control of the signals of the left
and right channels is performed, and the signals emitted from the speakers (5) and (6) are
expanded. As a result, the user can obtain a good stereo feeling. Next, the first selection switch
and the second selection switch (company) are closed, that is, when the first sound field
enlargement circuit a? and the second sound field enlargement circuit ?l are in the operating
state, the head-on plug is headed A description will be given of the operation in the case of
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insertion into the 7-on jack (7). When the head-on plug is inserted into the head 7 on-hook (7),
the "? First control switch (2)" and the second control switch ?J are released. As a result, the 1st
f-field expansion circuit (d) and the second sound-field expansion circuit (1 g is disconnected
from the negative feedback circuits ?J and ?Q and the third return resistance ?? and 11!
4 feedback resistor ? 9 is disconnected from the negative feedback circuit ? and ? Q As a
result of such disconnection, there is no sound field expansion action, and the gains of the first
amplifier circuit (3) and the second amplifier circuit (4) decrease. Therefore, the level of the
signal 817 applied to the headphone is at an appropriate level, and good reproduced sound can
be heard without omission of the central sound. In this embodiment, mechanical switches are
used as the first control switch @, the second control switch (13, the first control switch @ second
and the second selection switch (company), but switching elements such as transistors are used.
It can also be done. As described above, according to the control circuit of the present invention,
when the head 7 is used in an acoustic device provided with a narrow space between the left and
right speakers and provided with the sound field expansion circuit 7, the function of the sound
field expansion circuit Not only is it possible to reduce the gain of the amplification circuit, not
W, so that the problem that the central sound falls off is eliminated, and listening to the signal
sound at an appropriate level without adjusting the volume It can.
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