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JP2004328519

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DESCRIPTION JP2004328519
The present invention provides an audio reproduction apparatus capable of reproducing
surround audio signals such as 5.1 channels by using an external speaker and reproducing the
surround audio signals via an external apparatus. An extraction unit (41) receives an input signal
and extracts and outputs a main audio signal and a surround audio signal therefrom, and a
surround audio signal from the extraction unit is amplified to be supplied directly to an external
speaker This audio playback device has an audio processing unit 15 that outputs the output to
the output terminal 23 and further outputs the surround audio signal to the external device 24
so as to supply the surround audio signal to the external device. An audio signal can be
reproduced. [Selected figure] Figure 4
Audio reproduction apparatus and video reception apparatus
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio reproduction apparatus and a video reception apparatus such as a digital television
incorporated in a digital television or the like, and more particularly to an audio reproduction
apparatus and a video reception apparatus handling surround audio. 2. Description of the
Related Art Recently, a wide variety of AV devices that handle digital signals have been developed
and manufactured and are becoming widespread. As such technology, there is known a
technology such as a so-called surround system or Dolby system which can easily reproduce a
realistic sound field using a plurality of speaker units. As a related art related to this, there is an
example in which a surround system is constructed with a plurality of speakers, and the level of
the audio signal of each speaker is varied according to the listener's listening point (for example,
see Patent Document 1) . This is a technology for creating an optimal sound field by
automatically adjusting the audio signal level according to the position of the listener even if the
listener moves from the center of the four speakers. [Patent Document 1] Japanese Patent
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Application Publication No. 05-122800. [0005] In such a surround system, for example, when it
is intended to wirelessly couple the sound device body and the surround speaker, it is desirable
to transmit a surround signal using a wireless transmitter. become. However, in the abovedescribed prior art, for example, even if the outputs for the left surround speaker and the right
surround speaker are respectively provided as the surround output of the digital television, the
speakers are directly connected to each other. If only a terminal is provided, even if a wireless
transmitter is connected to this, there is a problem that the output is too large to operate stably
because the output is a signal amplified for a speaker. According to the present invention, an
audio reproduction apparatus capable of providing an external apparatus for surround by
providing an output terminal for connecting an external apparatus exclusively for an output for
surround and an image receiving apparatus using the same Intended to be provided. SUMMARY
OF THE INVENTION According to the present invention, an input terminal to which an input
audio signal is supplied; and a main audio signal and a surround audio signal extracted from the
audio signal supplied to the input terminal and output Extracting the main audio signal output
from the extracting unit and outputting it to the first output unit, amplifying the surround audio
signal and outputting it to the second output unit for the external speaker, and further A signal
processing unit configured to output the surround sound signal to a third output unit for an
external device.
Further, according to the present invention, an input terminal to which an input signal including
a video signal and an audio signal is supplied; and a separation unit which separates the audio
signal and the video signal from the input signal supplied to the input terminal; An image
processing unit for processing the video signal from the separation unit and displaying it on a
display unit; and a pre-separated audio signal being input, and extracting and outputting a main
audio signal and a surround audio signal from the input audio signal An extraction unit;
amplifying the main audio signal output from the extraction unit and outputting it to a first
output unit; amplifying the surround audio signal; outputting it to a second output unit for an
external speaker; And a signal processing unit configured to output the surround audio signal to
a third output unit for an external device. The audio reproduction apparatus or the video
reception apparatus according to the present invention outputs an audio signal for surround to
an external speaker and an external apparatus dedicated to surround audio, for example, in a 5.1
channel sound system, by the above-described structure. Each possible output unit (output
terminal) is provided. Therefore, it becomes possible to connect, for example, a wireless
transmitter as an external device for surround sound. Thereby, while connecting a dedicated
surround speaker, it is possible to simultaneously reproduce surround sound using an external
device. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an audio reproduction
apparatus and a video reception apparatus according to an embodiment of the present invention
will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an
example of a video receiving apparatus having an audio reproducing apparatus according to an
embodiment of the present invention, and FIG. 2 is a block diagram showing an overall
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configuration of an audio reproducing apparatus according to an embodiment of the present
invention. FIG. 3 is a block diagram showing a main part of an audio processing unit as an audio
reproduction apparatus according to an embodiment of the present invention. FIG. 4 is an
external view of a video receiving apparatus having an audio reproduction apparatus according
to an embodiment of the present invention. Explanatory drawing which shows a connection with
a speaker etc., FIG. 5 is a block diagram which shows the principal part of the other example of
the audio processing part as an audio reproduction apparatus which is one Embodiment of this
invention. (Audio Reproduction Device and Video Reception Device) An audio reproduction
device according to an embodiment of the present invention is provided inside the video
reception device A as shown in FIG. 1, and an audio processing unit 15 for reproducing surround
sound. The main component is For example, the video reception device A shown in FIG. 1 is a
digital television device, and the audio processing unit 15 is built in the digital television device.
However, it may be provided as a single audio reproduction device. In FIG. 1, a video receiving
apparatus A includes a tuner unit 11 connected to an antenna, an image processing unit 12 for
processing a video signal, and processing such as brightness adjustment and contrast adjustment
in the image processing unit. For example, a broadcast program is displayed on the display 13 to
which the applied video signal is supplied. Furthermore, it has input terminals 26 and 27 to
which signals from external devices such as a DVD player and a VTR are supplied. These input
terminals 26 and 27 receive, for example, an optical signal via an optical fiber, and the input
signals from these input terminals 26 and 27 or the tuner unit 11 are respectively input to the
selector unit 14 and any one of the input signals Selectively output video and audio signals
corresponding to The video signal from the selector unit 14 is output to the image processing
unit 12, and the audio signal is output to the audio processing unit 15. In addition, in order to
control the overall operation of the video reception device A, a control unit 16 comprising a
microprocessor is provided. The control unit 16 is configured to be given a user's instruction via
a remote controller or the like. Furthermore, the video reception device A includes speakers 21
for L (left) and R (right) built in a housing, and these speakers 21 are connected to the audio
processing unit 15. Further, the audio processing unit 15 is provided with an external speaker
output terminal 22, an external surround speaker output terminal 23, an external surround
output terminal 24, and an output terminal 25 for bass reflex. The output terminals 22, 23, 24
are constituted by a pair of L and R terminals. Here, as shown in FIG. 1 or 2, external speakers 31
and 32 are connected to the external speaker output terminal 22 of the video receiving device A,
and an external surround speaker 33 is connected to the external surround speaker output
terminal 23. , 34 are connected, a wireless transmitter (Wireless Transmitter) WT (or simply an
external amplifier device) is connected to the external surround output terminal 24 as an
example, and a bass reflex speaker 35 is connected to the bass reflex output terminal 25. It will
be. In the video receiving apparatus A having such a configuration, a broadcast signal selected
and demodulated by the tuner unit 11 or a video / audio signal input from a DVD player or VTR
via the input terminals 26 and 27 The selector unit 14 is supplied, one of the video and audio
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signals is selected under the control of the control unit 16, the selected video signal is supplied to
the image processing unit 12, and the selected audio signal is an audio processing unit. Supplied
on 15.
In the image processing unit 12, the video signal is appropriately processed under the control of
the control unit 16, and the video is reproduced on the display 13. The audio processing unit 15
appropriately processes the audio signal, and the built-in speaker 21 reproduces the audio.
Furthermore, in the audio processing unit 15, the surround signal is reproduced and the like, and
supplied to the external speaker output terminal 22, the external surround speaker output
terminal 23, the external surround output terminal 24, and the bass reflex output terminal 25
respectively. (Detailed Description of Audio Processing Unit) Next, an audio processing unit 15 as
an audio reproduction apparatus according to an embodiment of the present invention will be
described. The audio processing unit 15 is composed of, for example, a Dolby Surround decoder,
and reproduces audio signals of 5.1 channels which are Dolby Digital or four channels of Dolby
Pro Logic. In the following description, it is assumed that the L channel and R channel signals of
the Dolby Digital signal or Dolby Pro Logic signal are main audio signals, and the surround
signals of the L channel and R channel are surround audio signals. The details and usage of the
audio processing unit 15 will be described in detail below with reference to FIG. 3 and
subsequent drawings. FIG. 3 shows an embodiment of the main part of the audio processing unit
15, and the audio signal selected by the selector unit 14 is given to the audio processing unit 15.
The audio processing unit 15 extracts the surround signals SR and SL by the surround decoder
41 when the signal is a 5.1ch signal that is Dolby Digital or a 4ch signal that is Dolby Pro Logic.
The surround signals SR and SL are supplied with necessary gains by the buffer circuits 42 and
43, respectively, and supplied to the audio processor 44 to adjust the input volume. Furthermore,
the gain necessary for this output signal is given again by the buffer circuits 45 and 46 and
supplied to the external surround output terminal 24. The buffer circuits 45 and 46 are for
obtaining conditions (correction of low impedance and output amplitude) suitable for connection
to an external device. Here, the surround sound signal output from the external surround output
terminal 24 is a variable output whose volume is adjusted by the audio processor 44, and the
operation of adjusting the surround level of the TV set without operating the external device. Can
be adjusted to an appropriate volume level.
On the other hand, as shown in FIG. 4, the surround signals SR and SL extracted by the coder 41
in surround are supplied to the amplifier unit 51 via the control switch 53 after passing through
the audio processor 44 and the external speaker 33 , 34 (for example, 8 Ω, 16 Ω, 32 Ω) and
amplified by an amplification factor of a gain (for example, about 20 dB to 26 dB) to be supplied
to the external surround speaker output terminal 23. Thereby, the surround sound signal can be
reproduced by the external speakers 33 and 34. The surround sound signal from the audio
processor 44 is output to the external surround output terminal 24 through the amplifier 45 (46)
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and the control switch 54, and the wireless speakers 36, 37 (see FIG. 2) using the wireless
transmitter WT etc. It becomes possible to reproduce by etc. The on / off of the control switches
53 and 54 is controlled by the control signal from the control unit 16 or the control signal from
the control unit in the audio processing unit 15, and the output of the external surround speaker
output terminal 23 is output. Also, one of the outputs of the external surround output terminal
24 is appropriately turned on, or both are turned on. Although only one amplifier 51, 45 and so
on are shown in FIG. 4, each of the amplifiers 51, 45, etc. is actually configured with circuits for
R and L channels. (Modification) Further, a modification of the audio reproduction device
according to the present invention is shown in FIG. In the example of FIG. 5, the L and R signals
which are main audio signals and the surround audio signal respectively drive the input gain
control unit 61, the gain balance control unit 62, the tone control circuit 63, and the external
speakers. An amplifier unit 64 is added to obtain a gain of As shown in FIG. 5, in accordance with
the control of the control unit, the gains of the L and R signals and the surround signal can be
controlled in conjunction with each other by the gain control unit 61. That is, when the L and R
signals are amplified by 1.2 times, the surround signal is also amplified by approximately 1.2
times. Furthermore, according to the control of the control unit, the gain balance control unit 62
can control the balance of the gains of the L and R signals and the surround signal. Furthermore,
for example, in a Dolby Digital 5.1ch or Dolby Pro Logic 4ch sound system, the signal may be (L,
R, SL, SR, LFE, C) or the like. In the receiving device A, the built-in speaker 21 can be used as a
center speaker by setting the operation mode under the control of the control unit 16.
That is, in this operation mode, the main audio signal output is supplied to the external speakers
31 and 32 through the output terminal 22. For the built-in speaker 21, 5.1ch of Dolby Digital or
4ch of Dolby Pro Logic is provided. The center output (C) can be automatically set to be supplied
and output. Further, by controlling the tone control circuit 63 of FIG. 5 under the control of the
control unit 16, it is possible to control to a tone suitable for output to the wireless transmitter
WT or the like. For example, noise can be suppressed by suppressing high-pitched sound by tone
control. Furthermore, the output for external speakers can be tone controlled with a unique value
according to the model. The present invention is not limited to the embodiments described
above. As described above in detail, according to the present invention, an external output
terminal is provided to supply a surround sound output to a speaker and an external device. The
device can be used to reproduce surround audio signals. BRIEF DESCRIPTION OF THE
DRAWINGS FIG. 1 is a block diagram showing an example of a video receiving apparatus having
an audio reproduction apparatus according to an embodiment of the present invention. FIG. 2 is
an explanatory view showing a connection with an external speaker etc. of a video receiving
apparatus having an audio reproduction apparatus according to an embodiment of the present
invention; FIG. 3 is a block diagram showing a main part of an audio processing unit as an audio
reproduction apparatus according to an embodiment of the present invention. FIG. 4 is a block
diagram showing another example of an audio processing unit as an audio reproduction
apparatus according to an embodiment of the present invention. FIG. 5 is a block diagram
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showing still another main part of an audio processing unit as an audio reproduction apparatus
according to an embodiment of the present invention. [Description of Code] A: Video receiving
device, 11: Tuner, 12: Image processing unit, 13: Display, 14: Selector unit, 15: Audio processing
unit, 16: Control unit, 21: Built-in speaker, 22: External speaker Output terminals 23: external
surround speaker output terminals 24: external surround output terminals 25: output terminals
for bass reflex 26: light input terminals 27: input terminals.
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