close

Вход

Забыли?

вход по аккаунту

?

JPH0250698

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH0250698
[0001]
The present invention relates to a stereophonic audio device having left and right channels, and
more particularly to a sound field expansion circuit. (B) Conventional technology Recently, an
audio device called a radio tape recorder with a combination of a radio receiver and a Table
hooder has become widespread, but most of them are stereo type having left and right channels,
and are for left and right channels. Speakers are arranged on the left and right of the front plate
that constitutes the cabinet. In such a stereophonic sound device, it is difficult to obtain a good
stereo feeling because the distance between the left and right channel speakers can not be
increased. Also, recently, an acoustic device provided with a sound field expansion device called
surround has become widespread, and there is a device using a matrix circuit as disclosed in, for
example, Japanese Utility Model Laid-Open Publication No. 61-146097. . And, in the abovementioned tape recorder with radio as well, the amplification circuit is increased in output power,
and there is a method of connecting two amplification circuits (referred to as ?Halanst,
transformerless lt BTL)? as means for increasing the output power. As such a technique, there is
one disclosed in, for example, Japanese Patent Publication No. 55-28246. (C) Problems to be
Solved by the Invention In a stereophonic audio device incorporating a BTL-connected amplifier
circuit, when the sound field expansion circuit disclosed in the above-mentioned publication is
incorporated, the volume of the front speaker is backward. The problem is that the volume of the
speakers is reduced. In addition, the sound device in which such a sound field expansion circuit is
incorporated has poor operability because the operation / non-operation of the sound field
expansion circuit is performed by switching the operation switch. The present invention seeks to
provide a sound field enlargement circuit which improves such points. (D) Means for Solving the
Problem The sound field expansion circuit of the present invention amplifies the right channel
signal and amplifies the left channel first and second amplifier circuits and the left channel signal
that are BTL connected to each other. Forward right connected between the output terminals of
10-05-2019
1
the left channel first amplifier circuit and the output terminal of the right channel second
amplifier circuit. A front left channel speaker connected between the channel speaker, the output
terminal of the left channel first amplifier circuit, and the output terminal of the left channel
second amplifier circuit; and the right channel first amplifier circuit A plug of a speaker
connected between the output terminal and the output terminal of the left channel first / first
amplifier circuit and disposed at the rear is inserted, and the switching contact A plug of a
speaker connected between the output terminal of the first speaker jack and the output terminal
of the second channel amplifier for the right channel and the output terminal of the second
channel amplifier for the left channel. A second speaker jack, a circuit for expanding a sound
field provided between the first amplifier circuit for the right channel and the first amplifier
circuit for the left channel, and controlling an expansion operation by the circuit for expanding
the sound field And a switching element connected to the
(*) Operation The present invention is to control the operation / non-operation of the sound field
expansion circuit using the DC voltage output to the output terminal of the amplifier circuit
connected in BTL. (F) Embodiment The circuit shown in the drawing is an embodiment of the
sound field expansion circuit of the present invention. (1) is a right channel input terminal to
which a right channel signal is applied, and (2) is a right channel signal to which the right
channel signal applied to the right channel input terminal (1) is input and the signal is amplified
right A first amplifier circuit for a channel, the first input terminal connected to the output
terminal (3) and the right channel input terminal (1) and in phase with the signal output to the
output terminal (3) (4) and a second input terminal (5) in reverse phase to the signal output to
the output terminal (3). (6) is a second amplifier circuit for the right channel that is BTLconnected to the first amplifier circuit for the right channel (2), and is output to the output
terminal (7) while being grounded and connected to the output terminal (7) And the output
terminal (3) of the first amplifier circuit (2) for the right channel are connected via a resistor (9)
and the output terminal (7) And a second input terminal (10) in reverse phase to the signal that
can be output. (11) is a resistor connected between the second input terminal (10) of the right
channel second amplifier circuit (6) and the ground, and the voltage division between the resistor
9) and the right channel It has an operation of setting the level of the signal output to the output
terminal (3) of the one amplifier circuit (2) and input to the second input terminal (10). (12) is a
left channel input terminal to which a left channel signal is applied, and (13) is a left channel
signal to which the left channel signal applied to the left channel input terminal (12) is input and
which amplifies the signal A first amplifier circuit for a channel, the first input terminal
connected to the output terminal (14) and the left channel input terminal (12) and in phase with
the signal output to the output terminal (14) (15) and the second input terminal (16) in reverse
phase to the signal output to the output terminal 14). (17) is a second amplifier circuit for the left
channel which is BTL-connected to the first amplifier circuit for the left channel (13), which is
connected to the output terminal (18), grounded and outputted to the output terminal (18) And
the output terminal (14) of the left channel first amplifier circuit (13) through a resistor (20) and
10-05-2019
2
the output terminal (18). ) And a second input terminal (21) in reverse phase to the signal that
can be output.
(22) is a resistor connected between the second input terminal (21) of the second amplifier (17)
for the left channel and the ground, and the voltage division of the resistor (20) makes the
second channel It has an action of setting the level of the signal output to the output terminal
(14) of the one amplifier circuit (13) and input to the second input terminal (21). (23) and (24)
transmit the signal output to the output terminal (14) of the left channel first amplifier circuit
(13) to the second input terminal (5) of the right channel first amplifier circuit (2) A resistor (25)
connected between the output terminal (14) and the second input terminal (5) for input, the
second input terminal (5) of the right channel first amplifier circuit (2) And a resistor connected
between the ground and the ground, which is output to the output terminal 14) of the left
channel first amplifier circuit 13) by voltage division with the resistors (23) and (24), and the
second input terminal (5) has the function of setting the level of the signal input. (26) and (27)
transmit the signal output to the output terminal (3) of the first amplifier circuit for the right
channel (2) to the second input terminal (16) of the first amplifier circuit for the left channel (13)
A resistor 28 connected between the output terminal (3) and the second input terminal (16) for
input is a second input terminal (16) of the left channel first amplifier circuit (13). And a resistor
connected between the ground and the ground, which is output to the output terminal (3) of the
first amplifier circuit (2) for the right channel by voltage division with the resistors (26) and (27),
and the second input terminal (16) has the function of setting the level of the signal input. (29) is
a front right channel speaker disposed on the front right side, and its child terminal is connected
to the output terminal (3) of the right channel first amplifier circuit (2) and one terminal is the
right It is connected to the output terminal (7) of the channel second amplifier circuit (6). (30) is
a front left channel speaker disposed on the front left side, and its child terminal is connected to
the output terminal (14) of the left channel first amplifier circuit (13) and one terminal is the
above It is connected to the output terminal (18) of the left channel second amplifier circuit (17).
(31) is a jack for the first speaker into which the plug of the speaker disposed on the rear right
side is inserted, and is connected to the child terminal of the speaker and connected to the output
terminal of the first channel first amplifier circuit (2) 3) a first signal terminal (32) connected to
the second signal terminal, a second signal terminal connected to one terminal of the speaker
and a second signal terminal connected to the output terminal <14 of the left channel first
amplifier circuit (13) (33) The switch contact piece (34) is separated from the first signal
terminal (32) when the plug of the speaker is completely inserted.
(Good 5) is a jack for the second speaker into which the plug of the speaker disposed on the rear
left side is inserted, which is connected to the child terminal of the speaker and is the output of
the second amplifier circuit for the right channel (6) A first signal terminal (36) connected to the
terminal (7), a second terminal connected to one terminal of the speaker, and a second output
10-05-2019
3
circuit (18) of the left channel second amplifier circuit 17> A signal terminal (37) and a switching
contact (38) are provided. (39) is a resistor connected between the output terminal (14) of the
left channel first amplifier circuit (13) and the second input terminal (5) of the right channel first
amplifier circuit (2) 23) A first switching transistor whose collector is connected to the
connection point (A> of (24) and whose emitter is grounded, the base of which is connected via
the resistors (40) and (41) It is connected to the switching contact (34) of the first speaker jack
(31). (42) is a resistor connected between the output terminal (3) of the right channel first
amplifier circuit (2) and the second input terminal (16) of the left channel first amplifier circuit
(13) 26) A second switching transistor in which the collector is connected to the connection
point (B) of (27) and the emitter is grounded, and the base of the second switching transistor is
connected via the resistors (43) and (41) It is connected to the piece (34). (44) is a capacitor
connected between the ground and the bias current supply path (45) to the bases of the first and
second switching transistors (39) and (42), and shunts an AC signal and It has the function of
blocking the rapid inversion operation of the transistors (39) and (42). In such a circuit
configuration, the first amplifier circuit for right channel (2), the second amplifier circuit for right
channel (6), the first amplifier circuit for left channel (13), and the second amplifier circuit for
left channel (17) The gains are all the same and the output terminals (3), (7), (14) and (18) are
configured to output the same DC voltage. Also, the level of the signal input to the first input
terminal (4) of the first amplifier circuit for the right channel (2) and the second input terminal
(10) of the second amplifier circuit for the right channel (6) And the level of the signal input to
the first input terminal (15) of the left channel first amplifier circuit (13) and the second channel
second amplifier circuit (17). The value of each resistor is set so that the level of the signal input
to the second input terminal (21) of the same becomes the same.
As described above, the sound field expansion circuit of the present invention is completely
configured, and the operation of such a circuit will be described next. First, the operation of the
case where the first speaker jack (31) and the second speaker jack (not inserted in the third) will
be described. When in this state, the DC voltage output to the output terminal (3) of the right
channel first amplifier circuit (2) passes through the switching contact (34) provided in the first
speaker jack (31). The transistors (39) and (42>) are conductive since they are applied to the
bases of the first switching transistor (39) and the second switching transistor (42). Therefore, in
such a state, the signal output to the output terminal (14) of the left channel first amplifier circuit
(13) is bypassed by the first switching transistor (39), so that the right channel It is not input to
the second input terminal (5) of the one amplifier circuit (2). Similarly, since the signal output to
the output terminal (3) of the right channel first amplifier circuit (2) is bypassed by the second
switching transistor (42), the left channel first amplifier circuit ( No input is made to the second
input terminal (16) of 13). The gain of the first amplifier circuit for right channel (2), the second
amplifier circuit for right channel (6), the first amplifier circuit for left channel (13), and the
second amplifier circuit for left channel (17) is K, the right channel The signal input to the first
input terminal (4) of the right channel first amplifier circuit (2) through the input terminal (1) is
10-05-2019
4
passed through the R5 left channel input terminal (12) and the left channel first amplifier circuit
(13 Of the right channel first amplifier circuit (2) and the output terminal (14) of the left channel
first amplifier circuit (13). , KR and KL are output respectively. Therefore, the signal of R is input
to the second input terminal (10) of the second amplifier circuit for right channel (6), and the
signal of -KH can be output to the output terminal (7). Further, the signal of L is input to the
second input terminal (21) of the second amplifier circuit for left channel (17), and the signal of KL can be output to the output terminal (18). As a result, the front side where ten terminals and
one terminal are respectively connected to the output terminal (3) of the right channel first
amplifier circuit (2) and the output terminal (7) of the right channel second amplifier circuit (6)
Assuming that the signal applied to the right channel speaker <29> is FR, FR-KR-(-KR) snow 2 KR.
The front left channel has ten terminals and one terminal connected to the output terminal (14)
of the left channel first amplifier circuit (13) and the output terminal (18) of the left channel
second amplifier circuit (17). Assuming that the signal applied to the speaker (30) is FL, it
becomes FL-KL-(-KL) 2KL. The front right channel speaker (29) and BTL connection connected as
a load between the right channel first amplifier circuit (2) and the right channel second amplifier
circuit (6) thus BTL connected The front left channel speaker (30) connected as a load between
the left channel first amplifier circuit (13) and the left channel second amplifier circuit (17) has
2KR and 2KL respectively. Since a signal is applied, a large output can be obtained as compared
with the case of using one amplification circuit. As described above, although the sound emitting
operation, that is, the normal stereo reproduction operation is performed only by the speaker
(29) <30 disposed at the front, the plug of the speaker disposed at the rear at the jack for the
first speaker (31) The operation in the case of being inserted into the second speaker jack (35)
will be described. When the plug is inserted into the first speaker jack (31), the switching contact
piece (34) is disconnected from the first signal terminal (32), so the first switching transistor (39)
and the second switching transistor ( When the bias current to 42> is cut off, the transistor <39>
(42) becomes nonconductive. Therefore, in such a state, the signal output to the output terminal
(14) of the left channel first amplifier circuit (13) and the signal output to the output terminal (3)
of the right channel first amplifier circuit (2) The signals are input to the second input terminal
(5) of the first right channel amplifier circuit (2) and the second input terminal (16) of the left
channel first amplifier circuit (13). The signal is input from the output terminal (14) of the left
channel first amplifier circuit (13) to the second input terminal (5) of the right channel first
amplifier circuit (2) through the resistors (23) and (24). And the second input terminal (16) of
the left channel first amplifier circuit (13) from the output terminal (3) of the right channel first
amplifier circuit (2) through the resistors (26) and (27). Assuming that the signal input to? is
?R, the output terminal (3) of the first amplifier circuit for the right channel (2) and the output
terminal (14) of the first amplifier circuit for the left channel <13) Signals of (R??L) and K
(L??R) are output.
10-05-2019
5
Therefore, the signal of R-?L is input to the second input terminal (10) of the second channel
second amplifier circuit (6), and the signal of -K (R-?L) is output to the output terminal (7) Be
done. In addition, a signal of L-?R is input to the second input terminal (21) of the second
amplifier circuit (17) for the left channel, and a signal of -K (L-?R) is output to the output
terminal 18 thereof. It will be done. As a result, the positive terminal and one terminal are
connected to the output terminal (3) of the right channel first amplifier circuit (2) and the output
terminal (7) of the right channel second amplifier circuit (6). Assuming that the signal applied to
the right channel speaker (29) is FR, FR-K (R-.DELTA.I)-(-K (R-.DELTA.L))-2K (R-.DELTA.L) is
obtained. Moreover, the front left where ten terminals and one terminal are respectively
connected to the output terminal (14) of the left channel first amplifier circuit (13) and the
output terminal (18) of the left channel second amplifier circuit (17) Assuming that a signal
applied to the channel speaker (30) is FL, FL-K (L-.DELTA.R)-(-K (L-.DELTA.R))-2K (L-.DELTA.R) is
obtained, and thus, it is disposed forward From the right channel speaker (29) and the left
channel speaker (30), 2K (R-H) and 2K (L-.DELTA.R) signals are emitted, respectively. Although
the sound emitting operation of the front right channel speaker (29) and the front left channel
speaker (30) arranged as described above is performed, the jacks for the first speaker (31) and
the jacks for the second speaker are performed next. The operation of the rear right channel
speaker and the rear left channel speaker respectively connected to (35) will be described. The
output terminal (3) of the right channel first amplifier circuit (2) and the output terminal (14) of
the left channel first amplifier circuit (13) are connected via the first speaker jack (31) When the
signal applied to the rear right channel speaker disposed on the rear right side is RR, then, RR
processing K (R??L) ?K (L??R) = K (R?L + ?R??L). Further, it is connected to the output
terminal (7) of the right channel second amplifier circuit (6) and the output terminal (18) of the
left channel second amplifier circuit (17) via the second speaker jack (?). And the signal applied
to the rear left channel speaker disposed on the rear left on the left is RL-K (R-.DELTA.L>-(-K (L.DELTA.R))-K (L-R + .DELTA.L). It becomes-(DELTA) R.
In this way, the signals of K (R-L + ?R-?L) and K (L-R + ?L-?R) are respectively applied to the
rear right channel speaker and the rear left channel speaker disposed on the rear right and left
sides to emit noise As a result, the surround effect can be obtained. On the real tree side, the
switching contacts (34) provided on the first speaker jack (31) control the operations of the first
switching transistor (39) and the second switching transistor (42). However, it may be configured
to be controlled by the switching contact (38) provided in the second speaker jack (35). (G)
Effects of the Invention In the sound field expansion circuit of the present invention, the speakers
of the left and right channels arranged forward are connected between the output terminals of
the BTL-connected amplification circuits, respectively, and the plug of the speaker arranged
behind is inserted. Since the speaker jacks to be used are connected between the output
terminals of the amplification circuits of the left and right channels, the output can be increased
and a good surround effect can be obtained. Further, according to the present invention, the
10-05-2019
6
operation / non-operation of the sound field expansion circuit is controlled using the DC voltage
output to the output terminal of the BTL-connected amplifier circuit and the plug attachment /
detachment operation to the speaker jack. Therefore, not only the operability is improved, but
also the circuit configuration is simplified, and in particular, it has the advantage of being
inexpensive compared to the technology using a jack with a switch.
[0002]
Brief description of the drawings
[0003]
The circuit shown is one embodiment of the sound field expansion circuit of the present
invention.
(2) ... first amplifier circuit for the right channel, (6) ... second amplifier circuit for the right
channel, (13) ... first amplifier circuit for the left channel, (17 ) иии Second amplifier for left
channel, (29) иии Speaker for front right channel (30) иии Speaker for front left channel (31) иии Jack
for first speaker, (34) и и и и Switch contact piece, (35) и и и jack for the second speaker, (39) и и и first
switching transistor (42) и и и second switching transistor
10-05-2019
7
Документ
Категория
Без категории
Просмотров
0
Размер файла
17 Кб
Теги
jph0250698
1/--страниц
Пожаловаться на содержимое документа