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JPH05244685

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DESCRIPTION JPH05244685
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
television receiver having an external input / output terminal for audio, and more particularly to
a multichannel audio signal processing.
[0002]
2. Description of the Related Art In recent years, the widespread use of television receivers
equipped with external input / output terminals for video and audio signals has been remarkable,
and television receivers have also come to be used in combination with external audio devices. As
described above, when the video source system and the audio source system are integrated and
used, for example, a video disk or a video tape recorder is used as a source of the audio visual
system, but the audio system is an audio system or an image system. Can be enjoyed by a
television receiver.
[0003]
However, recently, the audio signal has also been multi-processed, and not only a simple stereo
signal (L, R signal) but also a center signal (C signal), a surround signal (S signal), Multi-output
type is rapidly becoming popular. As the multi-output type, there are a Dolby Pro Logic system, a
Hi-Vision 3-1 stereo system, and the like, and their reproduction methods and enjoyment ways of
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watching are also diversified. In particular, when enjoying a Dolby Pro Logic system, a highvision 3-1 stereo system, etc. in a television receiver, as shown in FIG. 3, a center speaker 29 is
required. In FIG. 3, reference numerals 26 and 27 denote left and right speakers, and 28 denotes
a television receiver main body. The arrangement of the center speaker 29 requires a device.
Although there is also a television receiver in which the center speaker 29 is built in from the
beginning, the reproduction speakers of L signal, C signal and R signal are close to each other, as
shown by localization of sound and sound spreading 30, 31, 32. There is a defect that lacks a
sense of separation. This means that you won't be able to make the most of high-end audio
sources.
[0004]
However, on the other hand, when enjoying a regular program broadcast (simple stereo,
monaural broadcast), the above-described large-scale sound production is not necessarily
required, and the built-in speaker of the television receiver may be sufficient.
[0005]
For this purpose, there are cases from playing high-quality sound fields such as Dolby Pro Logic
system and Hi-Vision 3-1 stereo system, to the case of simply listening to general stereo
broadcasting and monaural broadcasting, and one television with video system In order to realize
using a television receiver, it is necessary to change the connection of audio signals, to change
the arrangement of speakers, etc., and there are problems with operability and mobility.
[0006]
Therefore, it is an object of the present invention to provide a television receiver capable of
realizing various types of sound field reproduction environments by simple means without
changing the wiring between devices, changing the arrangement of the devices, and the like.
[0007]
According to the present invention, a left input terminal to which a stereo left channel signal is
supplied and a right input terminal to which a stereo right channel is supplied are provided to a
vision receiver main body provided with left and right speakers. The center input terminal to
which the center signal is supplied and the left input terminal and the right input terminal are
independently connected to the left and right speakers at the time of stereo signal reproduction,
and at the time of center signal reproduction, the center input terminal And a switch which can
be switched to connect the left and right speakers in common.
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[0008]
[Function] Simple switching of operability and mobility for easy switching between an
environment that realizes an upscale sound field that emphasizes a sense of reality, a sense of
force, and a sense of localization and an environment that realizes a simple sound field by the
above means. Can be selected.
[0009]
Embodiments of the present invention will be described below with reference to the drawings.
[0010]
FIG. 1A is a basic configuration diagram of the present invention.
An input terminal 1 receives a left channel audio signal, an input terminal 2 receives a center
signal, and an input terminal 3 receives a right channel audio signal.
The hot line and the cold line of the input terminal 1 are connected to the input terminals a1L
and a2L of the changeover switch 4, and the hot line and the cold line of the input terminal 3 are
connected to the input terminals a1R and a2R of the changeover switch 4. .
The hot line and the cold line of the input terminal 2 are connected to the input terminals b1L
and b2L of the switch 4, and the hot line and the cold line of the input terminal 2 are connected
to the input terminals b1R and b2R.
The L-side output terminal of the switch 4 is connected to the speaker 5, and the R-side output
terminal is connected to the speaker 6.
The speakers 5 and 6 are speakers built in the television receiver main body.
[0011]
The switching terminals on the L side and the R side of the switch 4 are interlocked, and it is
possible to selectively switch between the input terminal group side with the symbol a and the
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input terminal group side with the symbol b.
[0012]
FIG. 1 (B) also shows a more specific circuit.
The left channel audio signal input terminal 7 is connected to the terminal aL of the switch
circuit 11, the right channel audio signal input terminal 9 is connected to the switch circuit 11
terminal aR, and the center signal input terminal 8 is a buffer It is connected to the circuit 10.
The distribution output terminals of the buffer circuit 10 are connected to the terminals bL and
bR of the switch 11. The output terminals Lo and Ro of the switch 11 are connected to the
speakers 14 and 15 via the amplifiers 12 and 13, respectively. FIGS. 2A and 2B show examples
of the usage state of the above system.
[0013]
For example, when emphasis is on presence, feeling of force, and sense of localization as in the
Dolby Pro Logic system and Hi-Vision 3-1 stereo method, the changeover switch 4 (11) is
switched to the terminal with the letter b. Be Then, the center signal is supplied to the speakers 5
(14) and 6 (15) built in the television receiver main body, and is used exclusively for reproducing
the center signal. The signals of the left and right channels are respectively supplied to the left
and right external speakers 16 and 19 (FIG. 2 (A)). In FIG. 2A, reference numeral 20 denotes a
television receiver main body. When the localization and the spread of the sound at this time are
schematically shown, the left sound 21, the center sound 22, and the right sound 23 are
obtained. The sound 22 output from the speakers 14 and 15 is output in the same phase, so that
the sound is localized at the left and right center of the television receiver main body. As a result,
reproduction of sound full of sense of reality, feeling of force and sense of localization can be
obtained. Although not shown, a switch for turning on / off the external speaker 16 and the
terminal 1 (7) and the external speaker 19 and the terminal 3 (9) is also provided in conjunction
with the switch 4.
[0014]
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Next, when it is not necessary to place special emphasis on feeling of presence, feeling of force,
feeling of localization, etc., as when receiving a broadcast of a general program (in particular, a
Dolby Pro Logic system or a broadcast that is not Hi-Vision 3-1 stereo) Then, the changeover
switch 11 (4) is switched to the terminal with the symbol b. Then, the audio signal of the left
channel is independently supplied to the left speaker 14 (5), and the audio signal of the right
channel is separately supplied to the right speaker 15 (6). As a result, the localization and the
spread of the sound are as shown in FIG. 2 (B). At this time, the external speaker is not used, and
the state is the same as that of a normal television receiver.
[0015]
As described above, according to the present invention, it is easy to switch from a normal sound
field reproduction environment to a full-scale directional sound field reproduction environment
with good operability and with high mobility simply by providing a simple switch circuit. Can.
Therefore, one television receiver can be used for various applications, and the application range
is expanded. Furthermore, also in terms of design, there is also an advantage that model
development can be achieved with a common appearance design, which is also advantageous in
terms of cost.
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