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JPH02296499

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DESCRIPTION JPH02296499
[0001]
TECHNICAL FIELD The present invention relates to a television set with a built-in sound
reproducing device capable of localizing a sound image in the center of a Braun tube by creating
a virtual sound source of a center speaker for reproducing input audio signals in the center of the
Braun tube. . In recent years, a lot of movie software has been on the market, as represented by
video and laser discs. In addition, as the screen size of television has progressed, the video has
become as powerful as a cinema as it can be experienced at home. Along with that, development
of a television sound reproduction device matched with a large screen size image is in progress.
The configuration of a conventional sound reproducing device television set will be described
below with reference to the drawings. FIG. 2 shows the structure of a conventional television set
with built-in sound reproduction apparatus. In FIG. 2, 1 is an audio signal input means, 2 is an
amplifier, 3 is a center speaker, 8 is a television box, and 9 is a cathode ray tube. The operation
of the conventional sound reproduction apparatus built-in television set configured as described
above will be described below. The audio signal input by the audio signal input means 1 is
amplified by the amplifier 2 and reproduced by the center speaker 3 placed below the CRT 9. By
reproducing the audio signal from the center speaker installed below the center of the television
cathode ray tube in this manner, the sound image can be localized at the center in the left-right
direction. SUMMARY OF THE INVENTION However, in the configuration as described above,
when a person is mainly displayed at the center of the screen as in a television broadcast or the
like, localization in the left and right direction can be made to coincide with the image. The
problem is that the sound image is localized at the position of the center speaker (in this case,
below the center of the Braun tube), the image is at the center of the Braun tube, the sound
image is below the center of the Braun tube, etc. Had. SUMMARY OF THE INVENTION In view of
the above problems, the present invention provides a sound reproduction apparatus built-in
television set capable of localizing a signal reproduced from a center speaker at the center of a
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cathode ray tube and matching the position with an image. Means for Solving the Problems In
order to solve the above-mentioned problems, the television set with a built-in sound
reproduction device of the present invention is configured as follows. A signal input means for
receiving an audio signal, a virtual sound source control means for digitally processing an input
signal to localize a sound image in the center of the television, and under or at the center of the
television. Alternatively, both of them are provided with a center speaker having an acoustic
radiation surface, and the output of the virtual sound source control stage is applied to the center
speaker.
By providing virtual sound image control means for digital signal processing of a signal to be
reproduced from the action center speaker, it is possible to localize the sound image at the center
of the Braun tube and to match the position of the image. Embodiments Hereinafter, one
embodiment of the present invention will be described with reference to the drawings. FIG. 1
shows a television cent with built-in sound reproduction apparatus according to the present
invention. In FIG. 1, ▪ indicates audio signal input means, 2 indicates an amplifier, 3 indicates a
center real speaker (hereinafter referred to as a real speaker), 4 indicates a center virtual speaker
(hereinafter referred to as a ring speaker), and 5 indicates an input signal. The virtual sound
source control means for signal processing to make the ring speaker 4, 8 is a television set, 9 is a
cathode ray tube. Assuming that the listener points at the center of the CRT 9, the transfer
function from the real speaker to the left ear and the transfer function to the right ear are equal.
The same is true for the transfer function from the ring speaker. 6 is a transfer function from the
real speaker 3 to the listener's left and right ears. The transfer function R from the ring speaker 4
located at the center of the Braun tube is shown as 7 in the drawings. In order to realize the
effect that the signal S input by the audio signal human power means 1 is reproduced as if it
were the ring speaker 4 using the real speaker 3, the virtual sound source control means 5
transmits the signal ED to the manually input signal. The characteristic processing is performed,
and the signal is amplified by the amplifier 2 and output from the real speaker 3. At this time, the
signals PRL and PRR at the left and right ears of the listener are PRL = PRR = S * E, * HD (1). Also,
the signal PIL at the ear of the listener's left and right ears when the signal S is reproduced by
the ring speaker 4. PrR is P1 = PIR = S * R (2), the signal PRL at the listener's left ear, PIL is equal,
and the signal PRR at the listener's right ear. If PIR is equal, even if reproduction is performed by
the actual speaker 3, the same effect as obtained when reproduction is performed by the ring
speaker 4 can be obtained. Therefore, from the above equation, E, = R / HD (E) as (3). Is
determined. The ring speaker 4 can be made by realizing the ED represented by the formula (3)
in the virtual sound source control means 5, and the signal reproduced by the real speaker 3 can
be localized at the center of the Braun tube. Also, the transfer characteristic E realized by the
virtual sound source control means 5 when the real speaker is installed on the center of the
cathode ray tube.
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Is expressed by equation (4). EU = R / H, = --- · - (4) HIJ Niburaun tube when installed a transfer
function also real speaker reaches the ears CRT bottom center and top from the real speaker
installed on a central, E to the input signal The signal subjected to the processing of the transfer
characteristic of may be reproduced from the lower center speaker, and the signal subjected to
the processing of the transfer characteristic of E may be reproduced from the speaker located on
the center. Also in these cases, the signal reproduced by the real speaker can be localized at the
position of the imaginary speaker at the center of the Braun tube. Effects of the Invention By
providing virtual sound image control means for digital signal processing of a signal to be
reproduced from the center speaker, it is possible to localize the sound image at the center of the
cathode ray tube and to match the position of the image.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram of a television set with a built-in sound reproduction device according
to an embodiment of the claims of the present invention, and FIG. 2 is a block diagram of a
television set with a built-in sound reproduction device according to the prior art.
1 · · · · · · · · · audio signal input means, 2 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
·······················································································
3 Virtual sound source control means, 6 · · · · · · Transfer function from the real speaker, · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · TV box, 9 · · · CRT .
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