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JPS63230000

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DESCRIPTION JPS63230000
[0001]
The present invention relates to a stereo reproduction apparatus for reproducing left and right
channel signals with a multiway speaker and reproducing realistic sound. (B) Prior Art Various
circuit configurations have been proposed to improve the realism of stereo reproduction signals.
As one of them, for example, in Japanese Utility Model Laid-Open Publication No. 52-124703
(HO4R5100), a sound field expansion circuit is closely read between the signal path of the left
channel amplifier and the signal path of the right channel amplifier. A stereo reproduction circuit
is described. Also, in a general stereo playback apparatus, multiway speakers are connected to
the output side of the left and right channel amplifiers, for example, the playback frequency
range of 100 Hz to 10 kHz is played back by the first speaker, and the playback frequency range
of 500 Hz to 10 kHz is It is known that by reproducing with the second speaker and reproducing
the reproduction frequency range of 10 kHz or more with the third speaker, it is possible to
reproduce without causing distortion of sound. (C) Problems to be Solved by the Invention In the
case described in the above-mentioned conventional Japanese Utility Model Application
Publication No. 52-124703, when the left and right channel signals are (L) and (R), the phases
are mutually different. The shifted (ΔR) component and (ΔL) component are mixed, the (L +
ΔR) signal is output from the left speaker built into the stereo reproduction apparatus, and the
(R + ΔL) is built up from the same built-in right speaker. The internal speakers are separated by
connecting the left and right external speakers, and the left and right channel signals (L) and (R)
are output from the external speakers. When reproducing the left and right channel No. 16
whose sound field has been expanded by the built-in speaker, the signal components (ΔR) and
(ΔL) for sound field expansion are constant amounts, and the signal component is listened to by
the listener Can not be it to any. Also, since there is only one built-in speaker on each side, the
sound field is expanded in the entire reproduction frequency range. Therefore, it is not possible
to perform sound field expansion emphasizing the reproduction frequency range. (D) Means for
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Solving the Problems In view of the above-described conventional problems, the present
invention provides a method for generating a signal between the signal path of the right channel
amplifier and the signal path of the right channel amplifier. In a stereo reproduction circuit
connected to a sound field expansion circuit that inputs a part as a difference signal, a plurality
of speakers with different reproduction frequency ranges are connected to the output side of the
left channel amplifier, and the output of the right channel amplifier A plurality of speakers
having different reproduction frequency ranges are connected to 1 and each speaker for
reproducing at least the middle range among the plurality of speakers of the left and right
channels is directed outward with respect to the other adjacent speakers on the left and right of
the apparatus main body At an angle, and when operating the sound field expansion circuit, the
speakers that reproduce at least the midrange are connected in reverse phase to output the
sound field expansion signal outward There is provided a stereo reproduction device,
characterized in that configuration was.
(E) Operation When the stereo reproduction circuit of the present invention is switching the ON /
OFF switch to OFF, the outputs of the left and right channel amplifiers are respectively led to a
plurality of speakers having different reproduction frequency ranges, and the multi-way stereo
signal Can be played. When the ON / OFF switch is switched ON, the sound field expansion
circuit is connected between the signal paths of the left and right channel amplifiers via the
difference signal adjusting means, and the midrange of the plural speakers in the left and right
channels is selected. At least each speaker to be reproduced is connected in reverse phase, and a
(<LR) + Δ (LR) is output from the left speaker connected in reverse phase, and a ((RL)) is output
from the right speaker It acts to output + Δ (R−L)). At this time, since each speaker is disposed
at an angle outward in the left and right of the apparatus main body, the sound field expansion
signal is emphasized and output outward compared to the other speakers. The embodiment of
the stereo reproduction apparatus of the present invention shown in the drawings will be
described below. In FIG. 1, (1) is a left channel signal input terminal, <2) is a left channel
amplifier, (3), (4) and (5) are voice coils at the output side of the left channel amplifier (2). The
first, second and third speakers are connected to one terminal. (6) is a left channel signal input
terminal, (7) is a right channel amplifier, (8), (9) and (10) are connected to the output side of the
right channel amplifier (7) and one terminal of the voice filter is connected. These are the first,
second and third speakers. The first speakers (3) and (8) have a characteristic of reproducing a
reproduction frequency range of, for example, 100 Hz to 10 kHz as shown in FIG. 2 (A), and the
second speakers (4) and (9) are shown in FIG. As shown in (B), for example, it has a characteristic
of reproducing a reproduction frequency range of 500 Hz to 10 kHz, and as shown in FIG. 2 (C),
the third speaker (5) Do has a reproduction frequency range of 10 kHz or more. Have a
characteristic of reproducing The voice coil other terminals of the first and third speakers (3) (5)
on the left channel side are grounded in common, and the voice coil other terminals of the first
and third speakers (8) (10) on the right channel side Are also commonly grounded. The voice coil
other terminal of the second speaker 4) on the left channel side and the voice coil other terminal
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of the second speaker 9 on the right channel side are interlocked with the sound field expansion
ON / OFF switch described later (11) The selection switch (11) has a first ON terminal (b) and a
second ON terminal (c) in an open state, and the movable contact piece is grounded.
(L2) passes the output signal of the left channel amplifier (2) through the resistors (13, 14) and
the variable resistor (15) and the first ON terminal (b) of the sound field expansion ON / OFF
switch (16) or Input to the negative input terminal (17) of the right channel amplifier (7) through
the second ON terminal (C), and the output signal of the right channel amplifier (7) is resistance
(18) (19) and variable resistor Input to the negative input terminal (22) of the left channel
amplifier <2) via the first ON terminal (b) or the second ON terminal (c) of the sound field
expansion ON / OFF switch (21) Sound field expansion circuit. The OFF terminals (a) and (a) of
the respective 0N-OFF switches (1B) and (21) are in the open state. The variable resistors (15)
and (20) interlock with each other and are arbitrarily operated by the listener from the outside of
the stereo reproduction apparatus, and adjust the resistance value to adjust the feedback
component (ΔL) of the left channel signal and the right channel The feedback component (ΔR)
of the signal is tltL, the output signal component on the left channel side is a comb ΔR, and the
output signal component on the right channel side is (R−ΔL). (23) An external speaker
changeover switch linked to the sound field expansion 0N-OFF switch (16) (21), the changeover
switch <23) is a first ON terminal (b>, a second ON terminal (C) and an OFF terminal (A) The
movable contact piece is connected to the output side of the left channel amplifier (2). The first
ON terminal (b) and the OFF terminal (a) of the switching switch 7 <23) are in the open state.
<24) (25) is one terminal of the voice filter of the external speaker (26), a jack terminal
connected to the other terminal, and 27) (28) is connected to the other terminal of the voice filter
of the external speaker (29), one terminal The jack terminal (24>) is connected to the second ON
terminal (c) of the changeover switch (23), the jack terminals (25) and (27) are connected to each
other, and the jack terminal (28) is It is connected to the output side of the right channel
amplifier (7). FIG. 3 shows a speaker arrangement, and on the left side of the front face of a
stereo cassette player etc. (30), a first speaker (3), a second speaker (4) and a third speaker (5)
for left channel signals are shown. Are arranged, the first speaker (8), the second speaker (9) and
the third speaker (10) for the right channel signal are arranged on the right side of the front part,
and these respective speakers are built-in speakers. In this case, in particular, the left and right
second speakers (4) (9) are attached by the inclined attachment plates (31) (32) in a state of
facing the outside of the device.
The external speakers (26) and (29) are disposed to the left and right of the listener facing the
stereo playback device 30), and when the built-in speaker is referred to as a front speaker, the
external speaker is referred to as a rear speaker. It is Since the present invention is configured as
described above, when the 0N-OFF switches (16) and (21) are switched to the OFF terminals (a)
and (a), the sound field expansion circuit (.box-solid.) Is disconnected and operated. In addition,
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the voice coil other terminals of the left and right second speakers (4) and (9) are grounded by
the selection switch (11), and the external speakers (26) and (29) are jack terminals (24) (25), (
27) Even when connected to (28>), the external speakers (26) (29) are disconnected and do not
operate by the changeover switch <23). Therefore, in this state, the left channel signal (L)
outputted from the left channel amplifier (2) is shown in FIG. 2 (FIG. 2) by the first speaker (3),
the second speaker (4) and the third speaker (5). A) The right channel signal (R) reproduced from
the characteristics according to the frequency range of (B) and (C) and outputted from the right
channel amplifier <7) is also the first speaker (8), the second speaker (9) And the third speaker
(10) in the same manner. Next, when the movable contact piece of the 0N-OFF switch (16) (21) is
switched to the first ON terminal (b) (b) as shown in the figure, the sound field enlarging circuit (
The voice coil other terminals of the second speakers (4) and (9) of the left and right channels
are released from the ground by the selection switch (11) linked to this, and each second speaker
is connected. (4) (9) will be closely read in anti-phase relation. In this case, since the first ON
terminal (b) of the changeover switch (23) is open, the external speakers (26) and (29) are
disconnected. Therefore, in this state, since the sound field expansion circuit (.box-solid.) Acts, the
output .delta. (L-.DELTA.R) of the left channel amplifier (2) becomes the first speaker (3) and the
third speaker (5). And the output signal (R-.DELTA.L) of the right channel amplifier (7) is
reproduced by the first speaker (8) and the 1% 3 speaker (10). Since the second speaker (4) (9)
of this special number channel is connected in reverse phase relation, in the second speaker (4)
on the left channel side, the group ((L-ΔR)-(R-ΔL)) −g ((L−R) + Δ (L−R)) right channel (in the
second speaker (9) of jl), α ((R−ΔL) − (L−ΔR)) − α ((R−L) ) + Δ (R−L)).
In addition, night is an impedance ratio of a 1st, 3rd speaker and a 2nd speaker. Therefore, the
reproduction No. 2 output from the second speaker (4> (9) will be output larger as the Δ
component becomes larger, if a is made constant, and the sound field expansion signal
emphasizing the middle to high range component is It can be played back. Next, when the
movable contact piece of the 0N-OFF switch (16) (21) is switched to the second ON terminal (c)
(c), in addition to the aforementioned speaker reproduction operation, the second ON of the
changeover switch <23) The external speakers 26 (26> (, 29>) are connected in parallel with the
second speakers 4 (9) through the terminals (c), so that the external speakers 26 can be arranged
as shown in FIG. The sound field expansion signal can also be reproduced from (29). As
described above, when reproducing the field-of-field expansion dog δ, since the second speakers
(4) (9) are disposed at an angle toward the outside in the apparatus, the second speakers (4) (9) )
The signal output from the first speaker (3) (8) and the third speaker (5) (IQ) causes a slight time
delay, so that the signal from the first speaker and the third speaker A clearer sound field
expansion effect can be obtained without mixing with the components. (G) Effects of the
Invention Since the stereo reproduction apparatus of the present invention is configured as
described above, in addition to being able to perform normal stereo signal reproduction with a
multi-way speaker built in the stereo reproduction apparatus, the sound field is expanded. When
the circuit is operated, the sound field expansion signal can be emphasized and reproduced by a
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specific speaker (in the case of the embodiment, a speaker for reproducing middle to high
frequency range). Then, since the sound field expansion signal can be output outward from the
speakers disposed outward on the left and right of the stereo reproduction apparatus, it is
possible to execute realistic sound field expansion stereo reproduction with the multiway
speaker. It is possible.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a circuit diagram of the stereo reproduction apparatus of the present invention, the
second fi (A), (B) and (C) are characteristic diagrams showing reproduction frequency ranges of
the first, second and third speakers, and FIG. FIG.
(2) ... left channel amplifier, (7) ... right channel amplifier, (3) (8) ... first speaker, 4) (9) ... second
speaker, (5) ) (To) · · · third speaker, ■ ■ · · · · · sound field expansion circuit, (16) (21) · · · ONOFF switch, (11) · · · selection switch, (23) · · · · Switch, (26) (29) · · · external speakers, <31) (32) ·
· · inclined mounting plate.
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