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JP2007036614

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DESCRIPTION JP2007036614
PROBLEM TO BE SOLVED: To provide a bass reproduction device for generating and outputting a
low frequency component from each audio signal supplied from a plurality of audio signal input
devices. SOLUTION: Each input signal subjected to unique signal processing by each signal
processing portion is inputted to a mixing unit (mixer block) 4 of the next stage. The mixing unit
4 mixes the audio signal processing outputs subjected to the audio signal processing specific to
each of the plurality of audio signal processing units, and generates a low frequency component
of the audio signal. A plurality of audio signal processing outputs supplied to the mixing unit 4
have already been filtered in each signal processing unit and desired low-frequency components
have been extracted, and the mixing unit is low based on the adjustable mixing ratio. Generate a
range component. [Selected figure] Figure 1
Bass reproduction apparatus and sound reproduction system
[0001]
The present invention relates to a bass reproduction apparatus that receives each audio signal
supplied from a plurality of audio signal input devices and reproduces a bass signal based on
each audio signal. The present invention also relates to a sound reproduction system comprising
a plurality of audio signal input devices sharing the above-described bass reproduction device.
[0002]
09-05-2019
1
With the spread of Digital Versatile Disc (DVD), etc., 5.1 ch playback of movies is becoming
common at home as well. The 5.1ch “.1” ch is a low band dedicated signal. A super woofer is
installed separately from the main speaker, and it is used to reproduce low frequencies below
100 Hz or 200 Hz.
[0003]
In the above-mentioned systems, the low-frequency playback device such as a super woofer is
disposed apart from the main system so as to be spatially separated, since the sound generation
position can not be clearly detected in many cases with respect to the bass. It can be installed
relatively freely. If only one sound reproduction device exists in one room, one low frequency
reproduction device is sufficient.
[0004]
Furthermore, in an environment where there are a plurality of sound reproduction devices such
as a DVD player, a plurality of sound reproduction devices are connected to an AV amplifier
having a plurality of input terminals, and input sources are switched for reproduction. The AV
amplifier switches, selects, processes and amplifies each audio signal input from a plurality of
sound reproduction devices, and then supplies the amplified signal to a plurality of spatially
separated speakers.
[0005]
FIG. 5 is a block diagram of an AV amplifier 50 conventionally known. The AV amplifier 50
includes an input unit 51 for inputting a plurality of types of audio signals supplied from a
plurality of audio signal input devices (sound reproduction devices) connected to the outside.
Types of audio signals input from the input unit 51 include digital audio data in addition to 2
channels of analog and 5.1 channels of analog. As digital audio data, there are IEC60958,
IEEE1394, HDMI, etc., and all include 2ch and 5.1ch multichannel audio.
[0006]
Further, in recent years, devices supporting Ethernet Ethernet (registered trademark) and the like
and wireless input have been commercialized, and an input unit for inputting these input audio
09-05-2019
2
signals has also been provided.
[0007]
Each audio signal input from the input unit 51 for inputting the plurality of audio signals is
switched by the input selector 52 according to the user's request.
The audio signal selected by the switching of the input selector 52 is supplied to the signal
processing unit 53.
[0008]
The signal processing unit 53 performs predetermined signal processing for the front LRC
speaker, the surround speaker, the super woofer, etc. on the audio signal switched and selected
by the input selector 52. For example, the level adjustment, the low pass frequency setting
adjustment of the low pass filter, the high band cutoff amount adjustment, the delay amount
adjustment, the phase adjustment, and the like. The signal processing unit 53 supplies the power
amplifier (power amplification unit) 54 with an output for the front LRC speaker, the surround
speaker, and the super woofer.
[0009]
The power amplification unit 54 amplifies the output for the front LRC speaker, the surround
speaker, and the super woofer supplied from the signal processing unit 53, and outputs the
amplified output to each speaker.
[0010]
Here, the super woofer, which is a bass-only reproduction device connected to the AV amplifier
50, is driven by the AV amplifier 50.
Further, the signal processing unit 53 supplies a line level output for a super woofer via a
dedicated output terminal, without passing through the power amplifier 54, to an active amplifier
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3
in the super woofer apparatus. This causes the active amplifier in the superwoofer device to drive
the line level output for the superwoofer.
[0011]
The AV amplifier 50 simultaneously reproduces not only the super bass (for super woofer) but
also the main LRC signal and the rear and surround signals that are main, so switching between
multiple input sources results in all speakers The signal is switched and used.
[0012]
By the way, there is a situation where a plurality of sound reproducing apparatuses such as a
television receiver (TV) and an audio system, a portable game machine are mixed in one room,
and two or more sound reproducing apparatuses are operated at the same time. It came to be
assumed.
In this case, the AV amplifier 50 shown in FIG. 5 which selects and switches a plurality of input
audio signals can not cope with it.
[0013]
Of course, it is desirable to satisfy the requirement that each sound reproducing apparatus
reproduce ultra-low-pitched sound to give a sense of presence even in a portable system such as
a portable game machine.
[0014]
However, it is uneconomical that a plurality of sound reproducing devices, each of which requires
a low frequency reproduction device.
In addition, TV and portable systems have a main speaker and can reproduce the main LR signal
etc. of the signal to be reproduced, but those low frequency components and the low frequency
dedicated signal of ".1 ch" Since the aperture is generally small, reproduction can not be
performed satisfactorily, and if there is a low-range dedicated reproduction device that can be
used for each, reproduction with a wider reproduction frequency band becomes possible, and the
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4
quality of reproduction increases.
[0015]
Also, the input means has been diversified into analog, digital, wired and wireless, and devices
corresponding to each have been required.
[0016]
Conventionally, Patent Document 1 below discloses a speaker device whose task is to realize a
subwoofer system without adding an amplifier even when all channels of a head unit are
connected to a full range speaker. There is.
[0017]
The speaker apparatus of the following patent document 1 is a car audio system as a specific
example, and is described as follows with reference to FIG.
The audio signals input from the input terminals 12R and 12L are divided into two systems,
which are respectively output to the low pass filters 13R and 13L and the high pass filters 14R
and 14L.
Then, the audio signal whose middle and high frequency range is attenuated by the low pass
filters 13R and 13L is output to the subwoofers 15R and 15L, and the subwoofers 15R and 15L
emit a low frequency range. Further, audio signals whose bass range is attenuated by the highpass filters 14R and 14L are output to the rear speakers 5R and 5L through the output terminals
16R and 16L, and middle to high range is emitted from the rear speakers 5R and 5L.
[0018]
Further, in the case of using a small speaker poor in bass reproduction ability as a speaker other
than the subwoofer, for example, in the following Patent Document 2, when the bass component
is included only in the channels other than the subwoofer, this bass A multi-channel playback
device has been disclosed that solves the problem that components can not be played back and a
realistic playback sound can not be obtained.
09-05-2019
5
[0019]
The multi-channel reproduction device of Patent Document 2 below extracts low-pass signals in
the addition signal of front L channel signal, front R channel signal, front center channel signal,
rear L channel signal, rear R channel signal, and subwoofer signal, A signal processing device 30
for outputting to the subwoofer is provided.
This makes it possible to reproduce the bass component from the subwoofer if any of the
channels contains a bass component, and even if a small speaker other than the subwoofer is
included in the sound source It is possible to reproduce some bass components.
[0020]
Further, Patent Document 3 below discloses an audio reproducing apparatus, which has a task of
reducing an occupied band when transmitting an audio signal to a speaker wirelessly and
reproducing the audio signal.
[0021]
According to Patent Document 3 below, in the reproducing apparatus body 1, the audio signal is
separated into high frequency components and low frequency components, the high frequency
components are reproduced by the speakers 10a and 10b, and the low frequency components
are wirelessly transmitted to the subwoofer apparatus 2. The subwoofer device reproduces only
low frequency components.
[0022]
JP 2002-345099 JP 2003-037900 JP 2005-094150 JP
[0023]
By the way, in the above-mentioned patent documents 1-patent document 3, one sound
reproduction device is assumed, and a plurality of sound inputs are supplied from a plurality of
sound reproduction devices, and one sound reproduction device is simultaneously reproduced. It
is not intended to produce, for example, the bass of the desired sound reproduction device from
the low-range reproduction device.
[0024]
09-05-2019
6
The present invention has been made in view of the above-mentioned circumstances, and an
object thereof is to provide a bass reproducing apparatus capable of generating and outputting a
low frequency component from each audio signal supplied from a plurality of audio signal input
devices. .
[0025]
In addition, in an environment where a plurality of sound reproducing apparatuses coexist, the
reproduction frequency range of each sound reproducing apparatus can be expanded by sharing
the dedicated sound reproducing apparatus as compared with the case where the dedicated
sound reproducing apparatus is installed in each of them. An object of the present invention is to
provide a sound reproduction system capable of reducing the overall cost.
[0026]
In order to solve the above problems, the bass reproduction apparatus according to the present
invention receives each audio signal supplied from a plurality of audio signal input devices by an
input unit, and each input from the input unit by an audio signal processing unit. The audio
signal processing is performed on the audio signal, and the audio signal processing outputs of
the audio signal processing units are respectively mixed by the mixing unit. A low frequency
component of the audio signal generated by the mixing unit is generated by the amplification
unit, and a unique audio signal processing on each audio signal of the plurality of audio signal
processing units is controlled by the control unit.
[0027]
In the sound reproduction system according to the present invention, in order to solve the above
problems, a supplied bass reproduction device shared by a plurality of sound signal input devices
receives each sound signal supplied from a plurality of sound signal input devices by an input
unit. The audio signal processing unit performs unique audio signal processing on each audio
signal input from the input unit, and the mixing unit performs unique audio signal processing on
each of the plurality of audio signal processing units. The audio signal processing outputs are
mixed to generate a low frequency component of the audio signal, and the low frequency
component of the audio signal generated by the mixing unit is amplified by the amplification
unit, and the control unit Control unique voice signal processing for each voice signal.
[0028]
According to the bass reproduction apparatus according to the present invention, it is possible to
generate and output a low frequency component from each audio signal supplied from a plurality
of audio signal input devices.
09-05-2019
7
[0029]
According to the sound reproduction system of the present invention, in an environment in
which a plurality of sound reproduction devices coexist, the reproduction frequency range of
each sound reproduction device can be expanded by sharing the sound reproduction device
exclusively, and The overall cost can be reduced as compared to the case of installing the
playback device.
[0030]
Hereinafter, the best mode for carrying out the present invention will be described with
reference to the drawings.
[0031]
This embodiment is a dedicated bass reproduction apparatus which receives each audio signal
supplied from a plurality of audio signal input devices and reproduces a bass signal based on
each audio signal.
[0032]
FIG. 1 is a block diagram showing a schematic configuration of the low-tone dedicated
reproduction apparatus 1. As shown in FIG.
The bass-specific reproduction device 1 includes an input unit 2 for inputting a plurality of audio
signals, and a plurality of audio signal processing units 31, 32, 33, 34, 35 and 36 for performing
unique audio signal processing on each audio signal. And a mixing unit (mixer) 4 that mixes the
processing outputs from the plurality of audio signal processing units 31, 32, 33, 34, 35, and 36
to generate low-frequency components of the audio signal.
[0033]
Further, the low-pitched sound reproduction apparatus 1 further includes an amplification unit 5
for amplifying the low-frequency component generated by the mixing unit 4 and the sound
signals of the sound signal processing units 31, 32, 33, 34, 35 and 36. And a control unit
(controller) 6 that controls unique audio signal processing.
09-05-2019
8
[0034]
The input unit 2 is, for example, an input terminal based on standards such as 2 channels of
analog, 5.1 channels of analog, digital IEC60958, IEEE1394, HDMI, etc., and a plurality of
acoustic signals for outputting each audio signal based on these standards It is connected to the
output terminal of the playback device by wire or wirelessly.
[0035]
For example, wireless game data adapted to the Internet Protocol (IP) is sent from a portable
game machine to be described later.
The wireless data is received by the receiving unit 7, subjected to signal processing by the signal
processing unit 37 that performs unique audio signal processing according to the wireless data,
and then supplied to the mixing unit 4.
[0036]
For example, in addition to 2 channels of analog and 5.1 channels of analog, input signals based
on the standard of IEC60958, IEEE1394, HDMI, etc., which are input by the input unit 2, are
signal processing units 31, 32, 33, 34, 35, respectively. , 36 and 37.
[0037]
The plurality of audio signal processing units 31, 32, 33, 34, 35, 36 and 37 perform audio signal
processing on each audio signal input from the input unit 2.
These audio signal processing units 31, 32, 33, 34, 35, 36 and 37 may be operated only for the
input audio signal to be finally reproduced, and can be stopped when not in use. It is.
For example, if each audio input signal of analog 2 ch and IEC 60958 is input, only the signal
processing units 31 and 33 relating to these two input units need be operated.
09-05-2019
9
The operation of other signal processing units can be stopped.
Of course, if the signal processing is common to all the inputs, this block is not necessary since it
can be processed in the next block.
In addition, when the signal processing is performed digitally, the analog signal is AD converted
in this portion.
[0038]
Furthermore, if it is desired to use unique signal processing parameters for each input,
processing is performed in this part.
That is, unique audio signal processing can be performed.
The low-pass filter and the low-pass frequency of the filter, the high-pass cutoff amount, the
delay amount, the switching of the absolute phase, and the like are included therein.
Each of these parameters can be preset for the device by the user.
It can also be controlled by a remote control or the like.
Furthermore, it may be set through an input means capable of sending control information such
as IEEE 1394.
These are controlled by a system controller 6 in the apparatus.
Of course, the system controller 6 can make the control of each adjustment variable according to
the user's desire.
09-05-2019
10
[0039]
Each input signal subjected to the signal processing is input to the mixing unit (mixer block) 4 of
the next stage.
The mixing unit 4 mixes the respective audio signal processing outputs, each of which has been
subjected to unique audio signal processing by the plurality of audio signal processing units, to
generate a low frequency component of the audio signal. A plurality of audio signal processing
outputs supplied to the mixing unit 4 have already been filtered in each signal processing unit
and desired low-frequency components have been extracted, and the mixing unit is low based on
the adjustable mixing ratio. Generate a range component.
[0040]
The respective input signals are mixed in the mixing unit 4, but their mixing ratio can be
controlled by the system controller 6 and can be changed dynamically. The overall level after
mixing can also be controlled by the system controller 6, and it is also possible to perform limiter
processing or the like by signal processing.
[0041]
If the processing is performed digitally, the signal processing unit can convert the sampling
frequency to a lower one (such as 400 Hz) to reduce the size of the processing block, since the
final reproduction is bass.
[0042]
The low frequency component of the audio signal generated by the mixing unit 4 is poweramplified by the amplification unit 5 and converted into audio as a super woofer output.
In addition, the mixing unit 4 supplies a line level output for the super woofer through a
dedicated output terminal to the active amplifier in the super woofer apparatus without passing
through the power amplifier. This causes the active amplifier in the superwoofer device to drive
09-05-2019
11
the line level output for the superwoofer.
[0043]
FIG. 2 is a block diagram of a sound reproduction system including the bass-specific
reproduction device 1 of the above embodiment and a plurality of sound reproduction devices
such as the TV 11, the audio system 12, and the portable game device 13.
[0044]
The TV 11 is composed of, for example, a main body 11a having an LCD, a PDP, a CRT or the
like, and speakers 11L and 11R disposed on the left and right.
The audio system 12 includes a tuner & player unit 12a having a tuner for receiving AM and FM
broadcasts and a player for reproducing CDs and DVDs, an amplifier 12b such as a power
amplifier, and left and right speakers 12L and 12R.
[0045]
FIG. 3 shows the configuration of the portable game machine 13. The portable game device 13
connects the CPU 71 to the network communication unit 64, the codec processing unit 74, the
GDP (Graphics Display Processor) 78, and the VRAM 79 via the bus 72. Further, the CPU 71 is
connected to the ROM / RAM 73 and the LCD 63. Further, an input switch matrix unit 60 which
is an input operation unit is connected to the CPU 71.
[0046]
The network communication unit 64 performs wireless communication via an antenna 80
according to a predetermined protocol such as an access point for a wireless LAN, which will be
described later, and the protocol of the IEEE 802.11 system or its developed protocol.
[0047]
In response to a user input operation by the input operation unit (input switch matrix unit) 60,
the portable game machine 13 executes various game programs stored in the ROM / RAM 73
described later by the CPU 71.
09-05-2019
12
[0048]
The ROM / RAM 73 stores various game programs to be executed by the CPU 71, various
processing programs, and data necessary for processing.
The RAM portion of the ROM / RAM 73 is mainly used as a work area for various types of
processing, such as temporarily storing and holding data obtained in various types of processing.
[0049]
Of course, the portable game device 13 may include an EEPROM which is a non-volatile memory.
By providing this EEPROM, even if the power is turned off, the stored information is not lost, and,
for example, various setting parameters and the like can be stored and held.
[0050]
The codec processing unit 74 decodes video data and audio data according to each program
executed by the CPU 71. The decoded video information is subjected to video signal processing
by the GDP 78 and displayed on the LCD 63. Further, the audio information is amplified by the
amplifier 75 and then sent to the stereo 2ch speakers 13L and 13R and emitted from the
speakers 13L and 13R.
[0051]
FIG. 4 is a diagram showing a connection state of the sound reproduction system 10 included in
the home network 15. As shown in FIG. The TV 11 and the audio system 12 are connected to the
dedicated bass reproduction device 1 by a wired connection 15. The portable game device 13
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13
wirelessly communicates with the wireless LAN access point 14 of the home network 15 in
accordance with a predetermined protocol such as an IEEE 802.11 protocol or its developed
protocol.
[0052]
Even when the respective systems are exclusively used, only one bass-only reproduction device 1
may be used. Also, even when a plurality of people are in the same environment, one is watching
TV 11 and one is enjoying the portable game device 13, the respective bass components are
mixed and reproduced from the dedicated bass reproducing device 1 to each system Can be
enjoyed at the same time by adding sound.
[0053]
For example, although the portable game machine 13 is provided with the LRch speakers 13L
and 13R, it is difficult to reproduce the bass due to its small diameter. Therefore, the low-pitched
sound reproducing apparatus 1 generates low-pass audio using input audio signals from the TV
11 and the audio system 12 operating simultaneously and the input audio signal from the
portable game device 13, and leaves the portable game console 13. The bass is output from the
installation position of the bass dedicated reproduction device 1.
[0054]
Since the sound generation position can not be clearly detected in many cases with regard to the
bass, the low-range reproduction apparatus 1 such as a super woofer can be installed relatively
freely, for example, spaced apart from the main system.
[0055]
As mentioned above, although this invention was applied and demonstrated to the separate
reproduction | regeneration apparatus 1 only for the bass, this is a specific example and does not
limit this invention.
A configuration example may also be considered in which equivalent functions are implemented
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in a conventional AV amplifier.
[0056]
FIG. 2 is a block diagram showing a schematic configuration of a low-pitched playback device. It
is a block diagram of a sound reproduction system. It is a block diagram of a portable game
machine. It is a block diagram of the sound reproduction system contained in a home network. It
is a block diagram of AV amplifier conventionally known.
Explanation of sign
[0057]
1 bass dedicated reproduction apparatus, 2 inputs, 3 signal processors, 4 mixers, 5 amplifiers, 6
controllers, 7 receivers
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