JP4314727B2 - Television receiver - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an audio signal reproduction device such as a television receiver and a display device.
[0002]
[Prior art]
Recently, as symbolized by DVD, an audio reproducing apparatus capable of reproducing a large-capacity surround audio signal has appeared, and home theater surround audio reproduction has been demanded. The necessity is the same for television receivers and the like.
[0003]
For example, Japanese Patent Laid-Open No. 10-191203 has been proposed as a home theater surround sound reproducing apparatus. In Japanese Patent Laid-Open No. 10-191203, external speakers are prepared as L (left), R (right), and S (surround) speakers separately from the built-in television receivers, respectively. It has been proposed to input a C (center) signal to the L and R speakers built in the machine and use them as center speakers.
[0004]
[Problems to be solved by the invention]
However, in Japanese Patent Laid-Open No. 10-191203, a speaker built in a television receiver functions as a center speaker, so that there are other external L and R speakers and S speakers. Necessary.
Further, when the set built-in L and R speakers are used as the center speaker, the sound image spreads to the left and right, and it is difficult to localize to the screen center. For this reason, there has been a strong demand for proposals that can be enjoyed with only a television receiver to enjoy surround sound and achieve accurate sound image localization.
[0005]
An object of the television receiver of the present invention is to solve the above-described problems, and to enjoy surround sound with accurate sound localization only with a speaker built in the television receiver.
[0006]
[Means for Solving the Problems]
The L (left), R (right), C (center), and S (surround) signals of the sound reproducing device are encoded to form two-channel audio signals Lt and Rt, and the two-channel audio signals Lt and Rt are Means for decoding audio signals L, R, C, S; means for connecting the decoded C signal to a speaker for C through an amplifier; head-related transfer function adding means; adder / subtractor; phase Means for forming two-channel audio signals Ls, Rs from the decoded L, R, S signals by means of sound image localization creating means having a detector, and the two-channel audio signals Ls, Rs for L, R through amplifiers The television receiver is characterized by comprising means for connecting to each speaker.
[0007]
In addition, speakers for L, R, and C were arranged on the same plane below the CRT constituting the television receiver.
Furthermore, a sound pipe disposed on the front surface of the first speaker and a sound pipe disposed below the CRT are connected, and a second speaker having means for emphasizing and reproducing a sound of 4 kHz or more inside the connected sound conduit. -A sound is arranged, and the second speaker is tilted downward or upward in the sound conduit so that the sound is reflected and the sound image can be changed.
[0008]
With the above-described configuration, it is possible to enjoy surround with accurate sound localization using only a speaker built in the television receiver without using an external speaker.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a television receiver according to an embodiment of the present invention will be described with reference to the drawings.
[0010]
(Embodiment 1)
FIG. 1 shows a block configuration diagram of a television receiver according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 1 denotes a sound reproducing device, 2 denotes decoding means, 3 denotes head-related transfer function adding means, 4 denotes a phase shifter, 5 denotes sound image localization generating means, 6 denotes an L amplifier, and 7 denotes a C 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 reproduction device 1 is a 2CH audio output.
The 2CH 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 C speaker 10 is fixed to the center lower part of the CRT 12, so that the sound image of the center is surely localized at the center of the screen.
The L, R, and S signals are sent to the head related transfer function adding means 3. The head component transfer function adding means 3 processes the S component and performs addition and subtraction processing with the L and R components to convert it into 2CH signals Lh and Rh. Further, the spreader is adjusted by the phase shifter 4. The Ls and Rs signals created in this way are output by the L speaker 9 and the R speaker 11 through the L amplifier 6 and the R amplifier 8.
According to such a configuration, since the signal of only the C component is output from the C speaker, it is possible to obtain a sound image as if sound is heard from the center of the screen. From the L-speaker 9 and the R-speaker 11, the S component is localized backward as if by the signal obtained by processing the L, R, and S components excluding the C component by the head related transfer function adding means 3. Can do. The C-speaker 10, the L-speaker 9, and the R-speaker 11 are positioned on the same plane, thereby enabling more reliable localization control.
(Embodiment 2)
A television receiver according to Embodiment 2 of the present invention will be described with reference to FIGS.
[0012]
2 and 3 are main part sectional views of the television receiver according to the second embodiment of the present invention as viewed from the side, and FIG. 4 is a main part sectional view of the television receiver according to the second embodiment of the present invention. It is. 2 to 4, reference numeral 12 denotes a CRT, 13 denotes a cabinet, 13a denotes a cabinet sound guide, 14 denotes a horn, 15 denotes a first speaker, 16 denotes a second speaker, and 17 denotes a sound absorption. The material, 18 is a rib, and 19 is a back cover.
[0013]
As shown in FIGS. 2 to 4, a horn 14 in which a first speaker 15 is fixed to a sound guide portion 13 a formed in the cabinet 13 is connected to a lower portion of the CRT 12. A sound absorbing material 17 is fitted in the magnet portion of the first speaker, and the ribs 18 prevent the falling off. Since the sound absorbing material 17 absorbs sound from the back surface of the first speaker 15, the sound image localization of L and R on the front surface is improved.
Further, a second speaker 16 is mounted in the horn interior 14 obliquely downward. The second speaker 16 is a tweeter that can emphasize and output a frequency of 4 kHz or higher. By mounting the second speaker 16 obliquely downward, the sound reflected by the cabinet sound guide 13a is radiated frontward obliquely upward. With this configuration, the sound image can be raised.
Depending on the state of the cabinet sound hole portion 13b, as shown in FIG. 3, it is effective to attach the second speaker 16 obliquely upward.
[0014]
【The invention's effect】
As described above, according to the television receiver of the present invention, it is possible to enjoy the surround sound only by the television receiver and to obtain a correct sound image localization.
[Brief description of the drawings]
FIG. 1 is a block configuration diagram of a television receiver according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of a main part of the television receiver according to a second embodiment of the present invention. FIG. 4 is a cross-sectional view of main parts of a television receiver according to a second embodiment. FIG. 4 is a cross-sectional view of main parts of a television receiver according to a second embodiment of the present invention.
DESCRIPTION OF SYMBOLS 1 Sound reproduction apparatus 2 Decoding means 3 Head-related transfer function addition means 4 Phase shifter 5 Sound image localization preparation means 6 L amplifier 7 C amplifier 8 R amplifier 9 L speaker 10 C speaker 11 R Speaker 12 CRT
13 Cabinet 13a Cabinet sound guide section 14 Horn 15 First speaker 16 Second speaker 17 Sound absorbing material 18 Rib 19 Back cover

Claims (1)

Decoding means for decoding the Lt audio signal and the Rt audio signal, which are outputs of the sound reproducing device, into an L audio signal, an R audio signal, a C audio signal, and an S audio signal;
A C speaker disposed at a lower portion of the CRT for outputting a C sound signal as an acoustic wave as an output of the decoding means;
An L speaker disposed at the lower part of the CRT for outputting as a sound wave an Ls audio signal obtained based on the L audio signal, the R audio signal and the S audio signal which are outputs of the decoding means;
An R speaker disposed at the lower part of the CRT that outputs an Rs audio signal obtained based on the L audio signal, the R audio signal, and the S audio signal, which are outputs of the decoding means, as a sound wave;
Have
At least one of the C speaker, the L speaker, and the R speaker is
A first speaker located at the bottom of the CRT;
A first sound conduit disposed in front of the first speaker;
A second sound conduit connected to the first sound conduit and disposed below the CRT;
A second speaker for emphasizing and reproducing a sound of 4 kHz or more disposed inside the sound conduit constituted by the connected first sound conduit and the second sound conduit and tilted downward or upward;
Television receiver, characterized in that it comprises a.

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