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JP2005094150

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DESCRIPTION JP2005094150
PROBLEM TO BE SOLVED: To reduce an occupied band when an audio signal is wirelessly
transmitted to a speaker and reproduced. SOLUTION: In a reproducing apparatus main body 1,
an audio signal is separated into a high frequency component and a low frequency component,
the high frequency component is reproduced by the speakers 10a and 10b, and the low
frequency component is wirelessly transmitted to the subwoofer apparatus 2 The device
reproduces only low frequency components. [Selected figure] Figure 1
Audio playback device
[0001]
The present invention relates to an audio reproduction apparatus that transmits an audio signal
to a speaker wirelessly and reproduces it.
[0002]
For example, by transmitting audio signals of two stereo channels (also referred to as channels)
or multichannels wirelessly to a speaker and reproducing them, wiring to the speaker can be
omitted, or power higher than that of an existing speaker can be eliminated. Speakers can be
used.
In this case, all bands of the audio signal to be reproduced are divided as they are or into a
plurality of bands and digital radio transmission is performed. Further, as a reproducing
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apparatus which can continuously listen to the demodulated audio signal without interruption
even at a weak input, there is a wireless reproducing apparatus described in Patent Document 1
below. JP-A-9-116979
[0003]
However, particularly when transmitting high-quality audio signals in real time, the digital radio
transmission band that is always occupied is large, and this poses a serious problem in practice,
such as affecting other coexistent radio devices. In the limited radio frequency band, when a
reproduction device for digital wireless transmission of an audio signal in real time coexists with
another wireless device, a band which is always occupied by the reproduction device is secured,
and the remaining portion is Since the device uses it, it is preferable that the band always
occupied be as small as possible.
[0004]
The present invention has been made in view of the above points, and provides an audio
reproducing apparatus capable of performing digital wireless transmission which is less likely to
be a problem even when coexistence with other wireless devices is considered within a limited
wireless band. The purpose is to
[0005]
In order to achieve the above object, the present invention comprises an audio reproducing
device main body and an external speaker device, and the audio reproducing device main body
extracts high frequency components for extracting high frequency components higher than a
first frequency in a digital audio signal. A speaker for reproducing the high frequency
component, and a low frequency component extraction unit for extracting a low frequency
component lower than a second frequency which is the same as or different from the first
frequency from the digital audio signal. Digital radio transmission means for digitally radio
transmitting the low frequency component lower than the second frequency to the external
speaker device, the external speaker device comprising: digital radio reception means for digital
radio reception of the low frequency component; And a speaker for reproducing the low
frequency component.
[0006]
With this configuration, only the low frequency component is transmitted, so the occupied band
can be reduced.
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2
[0007]
According to the present invention, since only low frequency components are transmitted, the
occupied band can be reduced.
[0008]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
FIG. 1 is a block diagram showing an embodiment of an audio reproduction apparatus according
to the present invention, and FIG. 2 is a flowchart for explaining the processing of the audio
reproduction apparatus of FIG.
[0009]
In FIG. 1, the audio reproducing apparatus comprises a reproducing apparatus main body 1 and
a subwoofer apparatus 2.
In this example, the reproducing apparatus main body 1 is a notebook computer, and has
speakers 10a and 10b for reproducing the L and R channels, respectively, and audio signals
extracted from internal or external storage devices etc. And a high frequency component
extraction device 12 for extracting components of a predetermined frequency of 0 Hz to 20 kHz,
for example, 200 Hz or more, and outputting the component to the speakers 10a and 10b; A low
frequency component extracting device 13 for extracting a low frequency component having a
frequency lower than the second frequency, which is approximately 1 kHz or less, preferably
500 Hz or less, and low frequency components extracted by the low frequency component
extracting device 13 The digital wireless transmitting device 11 for digital wireless transmission
to the subwoofer device 2 It is.
The subwoofer device 2 comprises a digital radio reception device 20 that receives only low
frequency components in digital radio and a low frequency component reproduction device
(subwoofer / speaker) 21 that reproduces the low frequency components received by the digital
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radio reception device 20 Be done.
The reproducing apparatus main body 1 and the subwoofer apparatus 2 are disposed in the
same room or the like for reproducing music and the like.
[0010]
Next, the operation of the present embodiment will be described with reference to the flowchart
of FIG. When reproduction is started in the reproduction apparatus main body 1, an audio signal
is read out from the storage device or the like of the inside of the reproduction apparatus main
body 1 or an external device in step 101. In step 201, an audio signal is input to the high
frequency component extraction device 12, and high frequency components to be reproduced by
the speakers 10a and 10b are output. Then, at step 202, the audio signals of high frequency
components are reproduced by the speakers 10a and 10b.
[0011]
Further, at step 301, an audio signal is inputted to the low frequency component extraction
device 13, and the low frequency component to be received and reproduced by the subwoofer
device 2 is extracted. In the following step 302, only this low frequency component is
transmitted by the digital radio transmitter 11. In the following step 303, only this low frequency
component is received by the digital radio receiver 20 on the subwoofer 2 side and supplied to
the low frequency component regenerator 21. Then, at step 304, the low frequency component
reproducing device 21 on the subwoofer device 2 side reproduces the audio signal of the low
frequency component. Upon completion of steps 202 and 304, it is determined in step 102
whether or not the continuation of reproduction is necessary. If necessary, the process returns to
step 101. If not, the reproduction is ended.
[0012]
FIG. 1 is a block diagram showing an embodiment of an audio reproduction device according to
the present invention. It is a flowchart for demonstrating the process of the audio reproduction
apparatus of FIG.
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Explanation of sign
[0013]
DESCRIPTION OF SYMBOLS 1 playback apparatus body 2 subwoofer apparatus 10a, 10b
speaker 11 digital wireless transmission apparatus 12 high frequency component extraction
apparatus 13 low frequency component extraction apparatus 20 digital wireless reception
apparatus 21 low frequency component reproduction apparatus (subwoofer / speaker)
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