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JPH01149698

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DESCRIPTION JPH01149698
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio apparatus configured to set a speaker for direct sound and a speaker for indirect sound on
the entire surface of a listener to obtain a surround phonic effect. [Prior Art] A recent TV receiver
has come to use an audio device capable of obtaining a surround onk effect. In this surround
phonic sound device, as shown in FIG. 7, a direct sound speaker (3) (4) is attached on the left and
right sides of the TV receiver (1) toward the front of the listener (2) A speaker box (5) (6) is
provided, and a speaker indirect sound speaker (7) (8) for surround is attached behind the left
side and the right side of the listener (2) (9) (10) Was a four speaker system. Then, among the
direct sound speakers (3) (4), the left side speaker (3) adds a slight right side component (βR) to
the left side component (L) of the stereo audio signal in order to make the sound image inside L +
βR) is output, and the right speaker (4) similarly outputs (R + βL) obtained by adding a slight
left component (βL) to the right component. さらに。 Among the indirect sound speakers (7)
and (8), the left speaker (7) has removed the right component (αR) slightly included in the left
component (L) from the left component (L) of the stereo audio signal. The right speaker (8)
outputs (L-αR) (which is substantially only a pure L component), and similarly removes the left
component (αL) from the right component (R) (R-αL) ( Similarly, the pure R component was
output to obtain the surround effect. The circuits for processing the signal components of the
direct sound speakers (3) and (4) and the indirect sound speakers (7) and (8) and the
amplification circuits are all built in the TV receiver (1), and these circuits And the direct sound
speakers (3) (4) are connected by short cords (11) (12), and the indirect sound spikers (7) (8) are
long cords (13) (14) provided outside It was connected by. [Problems to be Solved by the
Invention] The above-mentioned surround sound signal type sound device is an indirect sound
speaker speaker box independent from the direct sound speaker of the front TV receiver
separately from the listener. Since it is necessary to install at the position and it is necessary to
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connect the amplifier circuit built in the TV receiver and the indirect sound speaker with a long
code, there is no installation place for the indirect sound speaker box, or the wiring cord There
was a problem that would be in the way. Furthermore, there was also a problem that the
appearance was bad.
In order to solve the above-mentioned problems, the present invention processes the stereo
sound signal by the direct sound control amplifier circuit and outputs it from the sound speaker
in the substantially front direction of the left and right. Apparatus, an indirect sound speaker
provided outward from the same structure to which the direct sound speaker is attached, a
surround sound signal conversion circuit for converting the stereo sound signal into a saroon
sound signal, and the surround sound signal conversion It comprises an indirect sound control
amplifier circuit connected to a circuit and controlling the indirect sound speaker. [Operation]
Since the present invention is constituted by the above means, the stereo audio signal extracted
by the stereo signal circuit from the television signal received by the TV receiver is amplified and
controlled by the direct sound control amplifier circuit and directly from the speaker for sound It
is output. The sound output from the direct sound speaker sounds as a stereo sound over a wide
range. At the same time, the stereo sound signal taken out by the stereo sound signal circuit is
converted to a surround sound signal by the surround sound signal conversion circuit, amplified
and controlled by the 1 indirect sound control amplifier circuit, and output from the indirect
sound speaker. The sound from the indirect sound speaker is reflected by the left and right walls
or is diffracted to make the listener sound as if there is a sound source on the side and the back,
and the surround effect along with the stereo sound from the direct sound speaker. Demonstrate.
Embodiment An embodiment of the present invention applied to an audio system of a TV
receiver will be described based on FIGS. 1 to 4. FIG. In FIG. 2, (1) is a TV receiver, and direct
sound speakers (3) and (4) are attached to the speaker box (5) and (6) substantially in the front
direction on both sides of the TV receiver (1). In addition, the indirect sound speakers (7) and (8)
are directed to the side projections (15) and (16) of the speaker box (5) and (6) respectively by
about 90 degrees outward and sideways with respect to the front. It is attached. Next, FIG. 1
shows drive circuits for these speakers (3) (4) (7) (8). In FIG. 1, (17) is a stereo audio signal
circuit, and the sound output terminal (18) and the R side output terminal (19) of the stereo
audio signal circuit (17) are direct sound control amplifier circuits (20) respectively. The
respective direct sound speakers (3), (4) are connected via (21). A conversion circuit (R-α L, L-a
R processing and conversion to a surround sound signal, respectively, of the L-side output stride
(18) and the R-side output terminal (19) of the stereo sound signal circuit (17) 22), and the
indirect output terminal (23) and the right output terminal (24) of the surround sound signal
conversion circuit (22) are connected to the indirect sound control amplifier circuits (25) and
(26), respectively, for the indirect sound Connected to the speakers (7) (8).
The operation in the above configuration will be described. The L side component and the R side
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component of the signal output from the ladder side output terminal (18) and the R side output
terminal (19) of the stereo signal circuit (17) are respectively amplified by the direct sound
control amplifier circuit (20) (21) And output from the direct sound speakers (3) and (4). The
sound emitted from these direct sound speakers (3) and (4) sounds as stereo sound over a wide
range as shown by the solid line (27) in FIG. The stereo sound signal from the stereo sound signal
circuit (17) is also input to the surround sound signal conversion circuit (22). The surround
sound signal conversion circuit (22) adds some opposite components (-aR) and (-.alpha.L) to the L
component and the R component, respectively, in order to remove the signal of the opposite
component contained slightly. It processes (L-aR) and (R-.alpha.L). As a result, the audio signal
output from the surround audio signal conversion circuit (22) is pure, becomes close to the R
component, and becomes a sound with which a surround effect can be obtained. This signal is
amplified by the indirect sound control amplification circuit (25) (26), and the sound output from
the indirect sound speaker (7) (8) is outputted from the indirect sound speaker (7) (8) as a
surrounding sound. When the sound is reflected or diffracted by a wall or the like to be heard by
the listener, the left component sound is heard from the left, and the right R component sound is
heard from the right. Therefore, a listener who is listening simultaneously to the sound of the
direct sound speakers (3) and (4) and the sound of the indirect sound speakers (7) and (8) can
obtain a feeling of surrounding like being surrounded by a large number of speakers . In the
embodiment of FIG. 1, since the direct sound speakers (3) and (4) have a circuit configuration
that outputs the L component and R component sounds as they are, the sound spreads to the
outside, and the indirect sound speaker (7) Fully overlap with the sound from (8), and a sense of
Go is sufficiently obtained. However, when the sound processed by (L−aR) (R + βL) is output
from the direct sound speakers (3) and (4), as shown by the two-dot chain line (28) in FIG. The
direct sound speaker (3) (4) is as pure as possible and outputs R, as indirect sound may not get
into the direct sound area sufficiently and a sound gap may occur and discrete sounds may be
heard. Is desirable. Further, in the above embodiment, since the indirect sound speakers (7) and
(8) are attached laterally outward and slightly upward, as shown in FIG. 4, the indirect sound
speakers (7) and (8) are walled (29). Even when they are installed facing each other, most of the
sounds from the indirect sound speakers (7) and (8) fall upward as shown by arrows, so that a
sufficient surround phonic effect can be obtained.
It should be noted that even if the indirect sound speakers (7) and (8) are directed to the outside
just sideways and are not facing upward as shown in FIG. 5, the surround horn effect can be
obtained, but the indirect sound speaker (7) (8) ) Is placed facing the wall (29), the sound from
the indirect sound speaker (7) facing the wall (29) repeatedly interferes between the wall (29)
and the speaker box (5) May reduce the honic effect. In the above embodiment, the surround
sound signal conversion circuit (22) removes some of the opposite side components (aR) and
(αL) from the L side component and the R side component (L−aR), (R−αL) (7) (5) If phase shift
circuits (25) and (26) are provided as shown in FIG. 5 and processed so as to have a phase
difference (Δt) respectively, a reverberation effect occurs, and the surround photonic The effects
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are emphasized further. In the above embodiment, the case where the speaker box is integrally
attached to both sides of the TV receiver has been described, but the speaker box is separated
from the TV receiver, and only the speaker box having no TV receiver. It may be [Effects of the
Invention] The present invention provides the indirect sound speaker and the direct sound
speaker on the same speaker box, so the speaker box for the indirect sound speaker is provided
separately from the installation place of the TV receiver etc. There is no need, and no i-line for
that purpose. Accordingly, space can be saved, installation is facilitated, and the entire apparatus
can be made compact and inexpensive. Furthermore, when the phase shift circuit is provided in
the surround sound signal conversion circuit, the Hall effect is also synergistically enhanced to
emphasize the one-piece surround phonic effect.
[0002]
Brief description of the drawings
[0003]
1 to 6 show an acoustic device according to the present invention, and FIG. 1 is a block diagram
showing an embodiment of a drive circuit, FIG. 2 is a perspective view, and FIG. 3 is a layout
diagram.
FIGS. 4 and 5 are layout diagrams when the speaker is facing the side wall, FIG. 6 is a block
diagram of another embodiment of the present invention, and FIG. 7 is a layout diagram of a
conventional acoustic device. (1) ... TV receiver, (2) ... listener, (3) (4) ... speaker for direct sound,
(5) (6) (9) (10) ... speaker box , (7) (8) ... speaker for indirect sound, (11) (12) (13) (14) ...
connection cord, (17) ... stereo audio signal circuit, (22) ... Surround sound signal conversion
circuit, (20) (21) ... direct sound control amplification circuit, (25) (26) ... indirect sound control
amplification circuit, (30) (31) ... phase shift circuit. Applicant: Fujitsu General Ltd. Figure 3
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