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JP2001359199

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DESCRIPTION JP2001359199
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio signal reproduction apparatus such as a television receiver and a display apparatus.
[0002]
2. Description of the Related Art Recently, as symbolized by DVD, an audio reproducing
apparatus capable of reproducing a large capacity surround audio signal has appeared, and there
is a demand for home theater-surround audio reproduction. The necessity is the same in a
television receiver and the like.
[0003]
For example, Japanese Patent Application Laid-Open No. 10-191203 has been proposed as a
home theater surround sound reproduction apparatus. In JP-A-10-191203, an external speaker
is prepared as a speaker for L (left), R (right) and S (surround) separately from the built-in
television receiver, and a television receiver is prepared. It has been proposed that a C (center)
signal be input to the L and R speakers built into the machine to be used as a center speaker.
[0004]
10-05-2019
1
However, in Japanese Patent Application Laid-Open No. 10-191203, since the speaker with a
built-in television receiver functions as a center speaker, other than that, the L, R speaker for
external use can also be used. A speaker for mosquitoes and S is required. Further, when a set
built-in L or R speaker is used as a center speaker, it is difficult for the sound image to spread
laterally and to be localized at the screen center. From this point as well, there has been a strong
demand for a proposal that allows the user to enjoy surround sound and complete accurate
sound image localization only with a television receiver.
[0005]
An object of the television receiver according to the present invention is to solve the abovementioned problems, and to make it possible to enjoy a surround in which a sound image is
accurately localized with only a speaker built in the television receiver.
[0006]
A two-channel audio signal Lt, Rt is formed by encoding L (left), R (right), C (center), S (surround)
signals of a sound reproducing apparatus. Means for decoding the two-channel audio signal Lt,
Rt into audio signals L, R, C, S, means for connecting the decoded C signal to a C speaker via an
amplifier, and a head Means for forming 2-channel audio signals Ls and Rs from the L, R and S
signals decoded by the sound image localization creating means having transfer function adding
means, adders / subtractors and phase shifters, and said 2-channel audio signals Ls and Rs A
television receiver characterized in that it comprises means for connecting to speakers for L and
R via an amplifier.
[0007]
In addition, speakers for L, R and C were disposed on the same plane at the bottom of the CRT
constituting the television receiver.
Furthermore, a second spi can be connected which connects the sound conduit arranged in front
of the first speaker and the sound conduit arranged in the lower part of the CRT, and has means
for emphasizing and reproducing the sound of 4 kHz or more inside the connected sound
conduit. -Place a power source, and tilt the second speaker in the sound channel downward or
upward to reflect the sound so that the sound image can be changed.
10-05-2019
2
[0008]
With the above-described configuration, it is possible to enjoy a surround image in which the
sound image is accurately localized with only the speaker built in the television receiver without
using an external speaker.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION A television receiver according to an
embodiment of the present invention will be described below with reference to the drawings.
[0010]
(First Embodiment) FIG. 1 shows a block diagram of a television receiver according to a first
embodiment of the present invention.
In FIG. 1, reference numeral 1 is a sound reproducing device, 2 is a decoding means, 3 is a head
related transfer function adding means, 4 is a phaser, 5 is a sound image localization creating
means, 6 is an L amplifier, and 7 is a C amplifier. An amplifier 8 is an amplifier for R, 9 is a
speaker for L, 10 is a speaker for C, 11 is a speaker for R, and 12 is a CRT.
[0011]
Next, the operation of FIG. 1 will be described, for example, in the case where the sound
reproducing apparatus 1 outputs 2 CH sound.
The 2 CH audio signals Lt and Rt output from the sound reproducing apparatus 1 are decoded by
the decoding means 2 into L, R, S and C component signals, respectively.
In the present invention, the C signal is output as it is by the C speaker 10 through the C
amplifier 7. The speaker for C 10 is fixed at the lower center of the CRT 12 so that the sound
image of the center is surely localized at the center of the screen. The respective signals of L, R
and S are sent to the head related transfer function addition means 3. The S component is
processed by the head related transfer function addition means 3 and converted into 2CH signals
10-05-2019
3
Lh and Rh by applying L and R components and addition / subtraction processing. Furthermore,
the spreader is adjusted by the phase shifter 4. The Ls and Rs signals thus produced are output
by the L speaker 9 and the R speaker 11 through the L amplifier 6 and the R amplifier 8.
According to this configuration, since the C speaker outputs a signal of only the C component, a
sound image can be obtained as if the sound can be heard from the center of the screen. The L
component, R, and S components excluding the C component from the L speaker 9 and the R
speaker 11 are processed by the head related transfer function addition means 3 so that the S
component is localized backward as it is Can. By positioning the C speaker 10, the L speaker 9
and the R speaker 11 on the same plane, more accurate localization control is possible. Second
Embodiment A television receiver according to a second embodiment of the present invention
will be described with reference to FIGS.
[0012]
2 and 3 are cross-sectional views of the main part of the television receiver according to the
second embodiment of the present invention as viewed from the side, and FIG. 4 is a crosssectional view of the main parts of the television receiver according to the second embodiment of
the present invention. It is. In FIGS. 2 to 4, reference numeral 12 denotes a CRT, 13 denotes a
cabinet, 13a denotes a cabinet sound conductor, 14 denotes a horn, 15 denotes a first speaker,
16 denotes a second speaker, and 17 denotes sound absorption. Reference numeral 18 denotes a
rib and 19 denotes a back cover.
[0013]
As shown in FIGS. 2 to 4, a horn 14 having a first speaker 15 fixed to a sound guiding portion
13a formed in a cabinet 13 is connected to the lower portion of the CRT 12. A sound absorbing
material 17 is fitted in the magnet portion of the first speaker, and the rib 18 prevents the falling
off. The sound absorbing material 17 absorbs the sound from the rear surface of the first speaker
15, so that the sound image localization of L and R on the front surface is improved. Further, a
second speaker 16 is mounted obliquely downward in the horn interior 14. The second speaker
16 is a tweeter capable of emphasizing and outputting a frequency of 4 kHz or more. By
mounting the second speaker 16 obliquely downward, the sound reflected by the cabinet sound
guiding portion 13a is emitted forward obliquely upward. With this configuration, the sound
image can be raised. Depending on the state of the cabinet sound hole 13b, as shown in FIG. 3, it
is effective to mount the second speaker 16 obliquely upward.
10-05-2019
4
[0014]
As described above, according to the television receiver of the present invention, it is possible to
enjoy the surround completely by only the television receiver and to obtain the correct sound
image localization.
10-05-2019
5
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