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JP2002112382

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DESCRIPTION JP2002112382
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
sound reproducing apparatus having a multi-channel sound reproduction signal reproduction
function and configured to be able to connect multi-channel headphones and 2-channel
headphones.
[0002]
2. Description of the Related Art In recent years, multi-channel audio signals represented by
audio coding systems such as Dolby AC-3 and DTS have come to be handled in reproduction
apparatuses such as DVD (VIDEO, AUDIO). For reproduction of this multi-channel audio signal, a
plurality of speakers are usually used in front of and behind the viewer (one speaker for each
channel signal).
[0003]
For example, in the case of speaker reproduction of a 5.1 channel audio signal such as Dolby AC3 or DTS, six speakers are required.
[0004]
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However, for reasons such as housing circumstances, it is not always the case that all the viewers
can arrange six speakers (including an amplifier for driving the speakers).
Since conventional audio devices such as CDs are generally based on left and right two-channel
signals, most viewers can be aligned with at least two speakers. However, even if the
multichannel signal is reproduced by two speakers as it is, the desired sound field effect can not
be obtained.
[0005]
Further, for example, when enjoying a DVD at midnight, it may be considered that loud sound
reproduction can not be performed by the speaker for reasons of neighborhood trouble or the
like. In this case, although the volume problem can be solved by using headphones, the
multichannel signal must be reproduced by the two left and right speakers of the headphones,
and the desired effect can not be obtained. Furthermore, the problem of localization in the head
of a sound image specific to headphones occurs.
[0006]
Therefore, various sound reproducing apparatuses having a signal processing apparatus for
reproducing multi-channel audio signals such as Dolby AC-3 and DTS with two speakers or twochannel headphones have been proposed.
[0007]
Moreover, what was comprised so that it might reproduce ¦ regenerate was also proposed by the
multi-channel headphone of the structure which provided the speaker on either side of the
headphone in front and behind.
[0008]
SUMMARY OF THE INVENTION In such an audio reproducing apparatus, in order to obtain an
optimal sound field effect by means of headphones, the sound signal of the multi-channel sound
source is localized at a distant position outside the head of the sound signal. It is required that
signal processing be performed so that reproduction can be performed also by a normal twochannel headphone, even by a multi-channel headphone having a structure in which the left and
right speakers of the headphone are provided before and after.
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[0009]
The present invention has been made to address such a demand and to provide an audio
reproduction apparatus capable of obtaining an optimum sound field effect by multi-channel
headphones and by two-channel headphones.
[0010]
SUMMARY OF THE INVENTION In order to solve this problem, the sound reproducing apparatus
according to the present invention is, in claim 1, a sound reproducing apparatus configured to be
connectable to multi-channel headphones and 2-channel headphones. Signal processing means
for processing the reproduction signal corresponding to the sound source of the channel to
output multi-channel or two-channel sound reproduction signal, and multi-channel for amplifying
the multi-channel sound reproduction signal output from the signal processing means An
amplifier, a first output connection means connected to the output of the multi-channel amplifier,
a two-channel amplifier for amplifying a two-channel audio reproduction signal, and a second
output connection connected to the output of the two-channel amplifier Means, and control
means for controlling the signal processing means, the control means comprising a multi-channel
head If a phone is connected to the first output connection means, this is detected, and if a twochannel headphone is connected to the second output connection means, this is detected,
corresponding to each connection It is configured to selectively control the reproduction signal
state of the signal processing means.
[0011]
Thereby, in response to the connection of the multi-channel headphone and the two-channel
headphone, it is possible to obtain an optimum sound field effect as a reproduction state
according to the acoustic characteristic of each headphone.
[0012]
The invention according to claim 2 is the method according to claim 1, wherein the control
means localizes the multi-channel sound reproduction signal output from the signal processing
means at a position where the sound image is separated when listening with headphones. As
described above, sound image localization control is possible, and by setting the reproduction
signal to the sound image localization control state, the sound image is controlled to be localized
at a distant position outside the head while being reproduced by the headphones. It has the effect
that the sound field effect can be further enhanced.
[0013]
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Further, in the invention according to claim 3, when the sound image localization control is on,
the control means is the signal processing means in the case where the connection of the first
output connection means is detected. Is controlled to be a sound image localization control
coefficient matched to the characteristics of the multi-channel headphone, and the controlled
acoustic reproduction signal is output through the multi-channel amplifier, and the connection of
the second output connection means is detected. In this case, the signal processing means is
controlled to be a sound image localization control coefficient matched to the characteristics of
the two-channel headphone, and the controlled acoustic reproduction signal is output via the
two-channel amplifier, and the connection state of each headphone Is configured to output an
acoustic reproduction signal corresponding to the sound source, and control of sound image
localization can be performed regardless of multi-channel and two-channel, and sound Such an
action can be performed in accordance with the characteristics of each of the headphones are
connected to localization control.
[0014]
Also, in the invention according to claim 4, when the control means detects the connection of
both the first output connection means and the second output connection means in the sound
image localization control state, the signal is transmitted. The processing means is controlled to
become a sound image localization control coefficient matched to the characteristics of the multichannel headphone, and the controlled sound reproduction signal is outputted to the first output
connection means through the multi-channel amplifier, and The multi-channel audio
reproduction signal is output to the front left and right channel speakers through the twochannel amplifier as the acoustic reproduction signal of the channel whose sound image
localization state is controlled is output to the output connection means of In particular, it has
the effect that the sound field in the forward direction can be reproduced by the characteristics
of multi-channel headphones in which the sound field effect of sound image localization is
remarkable. .
[0015]
In the invention according to claim 5, the control means performs signal processing of mixdown
of the input multi-channel signal while the signal processing means performs signal processing
of the input multi-channel signal when the sound image localization control is off. It is configured
to perform control to convert into an audio reproduction signal of two channels in accordance
with the acoustic characteristic of and output, and has an effect that reproduction by a stereo
sound field effect by two channels can be performed.
[0016]
The invention as set forth in claim 6 is such that the two-channel sound reproduction signal
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output from the signal processing means is output to the front left and right channel speakers of
the first output connection means. And has the same action as in claim 5.
[0017]
In the seventh aspect of the present invention, the control of the signal processing means by the
control means is a position at which a sound image is separated when listening to a multichannel sound reproduction signal output from the signal processing means by headphones. To
be able to localize the sound image so that sound image localization can be controlled, and when
the connection of only the second output connection means is detected, the input multi-channel
signal is subjected to signal processing of mixdown, and two channels It is configured to perform
control to convert into a two-channel audio signal according to the acoustic characteristics of the
headphone and output it, and only the second output connection means is connected regardless
of on / off of sound image localization control It has an effect that it is possible to perform
reproduction by stereo sound field effect by usual two channels.
[0018]
Further, in the invention according to claim 8, the control of the signal processing means by the
control means is a position at which a sound image is separated when listening to a multichannel sound reproduction signal output from the signal processing means by headphones.
Sound image localization control is possible, and connection of the first output connection means
is detected, or connection of both the first output connection means and the second output
connection means is detected. In this case, the control is performed so that the sound image
localization control coefficient matched to the characteristics of the multi-channel headphone is
set, and the initial value is set to the center of the sound image localization position. By being
connected, it is possible to set the state of sound image localization control to a predetermined
control state at the center.
[0019]
Also, in the invention according to claim 9, the signal processing means decodes a digital multichannel audio signal so as to process the reproduction signal corresponding to a plurality of
multi-channel sound sources, and an analog multi-channel It comprises an A / D converter for
converting an audio signal to a digital signal, and a DSP (digital signal processor) for converting
an input multi-channel audio signal to a predetermined multi-channel audio signal or a twochannel audio signal. It is configured to change the processing of reproduction signal
corresponding to the connection of channel headphone or 2-channel headphone, and supports
both digital multi-channel audio signal and analog multi-channel audio signal as a source of
multi-channel audio signal. Can handle DS By changing the processing depending on the type of
headphone, since always be signal processed in the vicinity of the maximum amount of
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computation, when a small number of input channels has the effect of being able to improve the
accuracy and effectiveness of the signal processing.
[0020]
In the invention according to claim 10, the DSP is installed at a predetermined position, a
transfer function correction circuit mainly reproducing the acoustic characteristics of the direct
sound component from the plurality of speakers installed at the predetermined position to the
listener's ear A reflected sound addition circuit that mainly reproduces the acoustic
characteristics of the reflected sound component from the multiple speakers to the listener's ear,
an addition / subtraction circuit that adds / subtracts each signal of the multichannel, and Front
left, front right, rear left, rear right acoustic playback signals can be output corresponding to the
speakers of multi-channel headphones that have a delay circuit that outputs through a filter and
have speakers on the left and right respectively In sound image localization control, in particular,
when the number of channels is small, the number of taps of each digital filter constituting the
transfer function correction circuit is large. It can be, or can increase the number of reflection
sounds by reflected sound adding circuit, an effect that the sound image localization effect and
sound quality, the sense of distance, spaciousness can be improved.
[0021]
In the invention according to claim 11, each of the first output connection means and the second
output connection means is singly, or plural, or one is single and the other is plural, and in the
case of plural, each is individual. The amplifier is connected in parallel with the above-mentioned
amplifier, and the output connection means can be appropriately increased and used according
to the use form of the sound reproducing apparatus.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to FIGS. 1 to 4. FIG.
[0023]
(First Embodiment) FIG. 1 is a block diagram of a sound reproducing apparatus according to a
first embodiment of the present invention, FIG. 2 is a block diagram showing the connection of
main parts thereof, and FIG. 3 is a block diagram showing a configuration in a DSP. FIG. 4 is a
flowchart for explaining the setting of signal processing characteristics corresponding to the
connection state.
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[0024]
In FIG. 1, reference numeral 1 denotes a sound reproducing apparatus main body, which receives
a multi-channel audio signal from a sound source such as a DVD player (video or audio),
performs signal processing, amplifies and outputs the signal.
For example, 2 is a multi-channel headphone composed of four speakers having speakers at the
front and back respectively in the left and right, and 3 is a two-channel headphone composed of
one speaker on the left and right. It is connected to the main unit 1 to reproduce the output
audio signal.
[0025]
In the sound reproducing apparatus body 1, 4 is an input circuit for inputting digital multichannel audio signals and analog multi-channel audio signals from a plurality of multi-channel
sound sources, 5 is a decoder for decoding digital multi-channel audio signals, 6 is an analog
multi-channel A / D converter for converting audio signals into digital signals, 7 (DSP) (digital
signal processor) for converting input multi-channel audio signals into predetermined multichannel audio signals or 2-channel audio signals, 8 by DSP 7 Is a D / A converter that converts
the digital audio signal into an analog audio signal.
Here, a signal processing device is configured by the decoder 5, the A / D converter 6, the DSP 7,
and the D / A converter 8.
[0026]
A multi-channel amplifier 9 amplifies a multi-channel audio signal output through the D / A
converter 8. The amplified signal is output to a first output connection means 10 comprising a
connector. In the example, two first output connection units 10 are connected in parallel, and
outputs of multi-channel signals are configured to be connectable to two multi-channel
headphones 2 simultaneously.
A two-channel amplifier 11 amplifies a two-channel audio signal output via the D / A converter 8.
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The amplified signal is output to a second output connection unit 12 formed of a jack.
In this example, two first output connection means 10 and one second output connection means
12 are provided. However, each of the first output connection means 10 and the second output
connection means 12 may be individually or in combination. In the case of a plurality of circuits,
they are connected in parallel to the outputs of the respective amplifiers 9 and 11.
[0027]
Reference numeral 13 denotes control means comprising a microcomputer, which controls the
DSP 7 constituting the signal processing apparatus, controls switching of the sound source input
to the input circuit 4, controls the multichannel amplifier 9, controls the two channel amplifier
11, etc. To do.
A memory 14 stores sound image localization control coefficients and the like according to the
characteristics of multi-channel headphones or 2-channel headphones, and corresponds to
selection of multi-channel headphones or 2-channel headphones at the time of signal processing
in DSP 7 described later. Sound image localization control coefficients matched to the
characteristics of the headphones are read into the DSP 7 through the control means 13.
Reference numeral 15 denotes operation means including a push button switch, a key, etc., and
performs operations such as input switching of a plurality of sound sources, sound image
localization control mode switching, distance control of sound image localization positions, and
power supply switching.
A display means 16 displays a switching mode, a sound level, a sound image localization state
and the like.
[0028]
The multi-channel headphone 2 is composed of four speakers 2a, 2b, 2c, and 2d disposed at the
front and the back respectively corresponding to the left and right sides of the head of the
listener A, and the end of the headphone cord 2e The connector 17 is connected to the connector
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17, which is connectable to the connector 10 described above.
Therefore, by connecting the connector 17 of the multi-channel headphone 2 to the connector
10, the multi-channel audio signal output through the multi-channel amplifier 9 can be
reproduced by the multi-channel headphone 2.
Further, the two-channel headphone 3 constitutes one speaker 3a, 3b on the left and right, and a
plug 18 is connected to the tip of the headphone cord 3e, and this plug 18 can be connected to
the above-mentioned jack 12 doing.
Therefore, by connecting the plug 18 of the two-channel headphone 3 to the jack 12, the twochannel audio signal output via the two-channel amplifier 11 can be reproduced by the twochannel headphone 2.
[0029]
Here, by connecting the connector 17 to the connector 10, the connection state can be detected
by the control means 13, and the connection state of the plug 18 to the jack 12 is similarly
detected by the control means 13. It is configured to be able to.
By the detection of these connections, connection of the multi-channel headphone 2 or
connection of the two-channel headphone 3 can be detected by the control means 13.
[0030]
Next, the connection relationship shown in FIG. 2 will be described.
[0031]
The DSP 7 converts the input multi-channel audio signal into a predetermined multi-channel
audio signal or 2-channel audio signal, but the type of multi-channel of the input sound source
(ie, the type of audio coding system, sampling frequency or channel The content of the signal
processing is set according to the characteristics of the multi-channel headphone 2 or the 2-
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channel headphone 3 connected corresponding to the number.
The output of the signal processing result by the DSP 7 is output as four audio signals of the
front left audio signal FL, the front right audio signal FR, the surround left audio signal SL, and
the surround right audio signal SR for multichannel Left and right audio signals L and R are
output for the channel.
Then, each audio signal output from the DSP 7 is output from the D / A converter 8 to the
connector 10 and the jack 12 through the multichannel amplifier 9 and the two channel
amplifier 11.
[0032]
Here, the amplifier for the front left audio signal FL and the front right audio signal FR in the
multi-channel amplifier 9 is configured as a BTL amplifier and has two output terminals and has
a connection detection terminal, The connector 10 has eight terminals a to h.
That is, the terminals a and b for the signal FL, the terminals c and d for the signal FR, the
terminal e for the signal SL, the terminal f for the signal SR, the terminal g for connection
detection, and the terminal h for grounding It is connected to the first output connection means
detection input of the control means 13.
The connector 17 also has an 8-terminal configuration like the connector 10, and is connected to
the multi-channel headphone 2 as shown in the figure, and the connector 17 is connected to the
terminal g by connecting the terminal g and the terminal h on the connector 17 side. The
terminal g on the connector 10 side is connected to the ground terminal h when it is connected,
and the connection to the ground is detected by the control means, and as a result, the
connection of the connector 17 to the connector 10 (ie connection of the multichannel
headphone 2) ) Will be detected.
[0033]
Further, the signals L and R outputted from the DSP 7 are connected to the terminals a and b of
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the jack 12 from the D / A converter 8 via the two-channel amplifier 11, and the terminal c of the
jack 12 is connected to the control means 13. The second output connection means is connected
to the detection input, and the terminal d is used as a ground terminal.
The plug 18 has three terminals of a normal stereo plug, and has terminals a and b for signal
connected to terminals a and b of the jack 12 and a terminal c for grounding, and this terminal c
is a terminal of the jack 12 The terminals c and d are common terminals, and are connected to
the two-channel headphone 3 as shown in the figure, and when the plug 18 is connected to the
jack 12 by the common terminal c on the plug 18 side, the terminal c on the jack 12 side is
grounded. This connection to the ground is detected by the control means, and as a result, the
connection of the plug 18 to the jack 12 (i.e., the connection of the two-channel headphone 3) is
detected.
[0034]
Next, a configuration example of the DSP 7 shown in FIG. 3 will be described.
[0035]
A multi-channel audio signal (subwoofer signal SWi, center signal Ci, front left signal FLi, front
right signal FRi, surround left signal SLi, surround right signal SRi) input to the DSP 7 is
converted to a low pass filter 19 and transfer function correction circuit 20 The processing is
performed by the reflected sound addition circuit 21, the addition / subtraction circuit 22, the
high pass filter 23, and the delay circuit 24.
Then, the multi-channel audio signals (four audio signals of front left audio signal FL, front right
audio signal FR, surround left audio signal SL, and surround right audio signal SR) for output to
the multi-channel headphone 2 described above are output At the same time, the left and right
audio signals L and R are output for two channels.
Here, by the processing of the transfer function correction circuit 20 and the reflected sound
addition circuit 21, setting of the localization position (distance at the position outside the head)
of the sound image at the time of reproduction by the headphones 2 and 3 is performed. Control
coefficients are stored in the memory 14 described above.
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[0036]
The transfer function correction circuit 20 mainly performs processing to reproduce the acoustic
characteristics of the direct sound component from the plurality of speakers installed at a
predetermined position to the listener's ear, and is constituted by, for example, a plurality of
digital filters The number of taps of each digital filter is adjusted in accordance with the type of
coding scheme, sampling frequency or number of channels.
In addition, in response to the detection of the connection of the multi-channel headphone 2 and
the detection of the connection of the two-channel headphone 3 described above, the
characteristics can be similarly adjusted by adjusting the number of taps of each digital filter
according to the characteristics of the head-on. It is configured to correspond to
Here, for example, if the processing capacity as a whole is constant, if the number of channels
decreases, the number of taps of each digital filter can be increased, and the accuracy and effect
of signal processing can be improved.
[0037]
The reflected sound addition circuit 21 performs processing for mainly reproducing the acoustic
characteristics of the reflected sound component from the plurality of speakers installed at a
predetermined position to the listener's ear, for example, a plurality of delay units connected in
series The level adjusters are configured to adjust the number of delay units and level adjusters
in accordance with the type of audio coding scheme, sampling frequency, or the number of
channels. In addition, in correspondence with the detection of the connection of the multichannel headphone 2 and the detection of the connection of the two-channel headphone 3
described above, it is assumed that the characteristic is corresponded by adjusting similarly
according to the characteristic of the head on. It is composed of Here, for example, if the
processing capacity as a whole is fixed, the number of reflected sounds can be increased if the
number of channels is reduced, and sound image localization effect, sound quality, sense of
distance and sense of spread can be improved.
[0038]
Further, the addition / subtraction circuit 22 is inputted by addition / subtraction of the signals
of each of the six channels of 5.1 channels subjected to the input post-processing by the transfer
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function correction circuit 20 and the reflected sound addition circuit 21. The front left audio
signal FL and the front right audio signal FR for headphone input on which the respective signals
are reflected are output.
[0039]
Among the input multi-channel audio signals, the surround left signal SLi and the surround right
signal SRi are input to the transfer function correction circuit 20 through the low pass filter 19 to
process the signal, and further through the high pass filter 23 to further delay circuit 24. ,
Surround left audio signal SL and surround right audio signal SR.
That is, as the surround left audio signal SL and the surround right audio signal SR on the output
side, only high frequency components among the surround left signal SLi and the surround right
signal SRi on the input side are output, and The high frequency component is reflected on the
front left audio signal FL and the front right audio signal FR on the output side.
[0040]
Further, among the input multi-channel audio signals, the subwoofer signal SWi and the center
signal Ci are reflected on the output front left audio signal FL and front right audio signal FR, and
the front left audio signal FL and front right audio signal FL. In accordance with the
characteristics of the headphone to which the signal FR is input, in the case of the multi-channel
headphone 2, the sound signal of the center channel is also reproduced by the front speakers 2a
and 2b, and in the case of the two-channel headphone 3, the left and right It is similarly
reproduced by the speakers 3a and 3b.
[0041]
With the DSP 7 configured as described above, in particular by the processing of the transfer
function correction circuit 20 and the reflected sound addition circuit 21, setting of the
localization position of the sound image (distance at the extra-head position) at the time of
reproduction by the headphones 2 and 3 is performed. The setting of the sound image
localization, that is, the selection control of the reproduction state is performed by the control
means 13.
[0042]
The first of selection control by the control means 13 is input switching corresponding to the
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input multi-channel sound source, which is an output signal of a DVD player (video or audio), an
output signal of a digital broadcast receiver, etc. The multi-channel audio coding method is AC-3,
DTS, Dolby Pro Logic, etc., corresponding to the input, switching of the input circuit 4 by the
selection operation of the operation means 17 and setting of signal processing of the DSP 7 Do.
[0043]
Further, the second of the selection control is to perform on / off control of the sound image
localization control mode by the operation means for setting whether to perform sound image
localization control or not, with the sound image localization control being on. The processing of
the transfer function correction circuit 20 and the reflected sound addition circuit 21 in the DSP
7 is used to set the localization position (distance at the position outside the head) of the sound
image when reproducing with headphones. Control is performed so as to be the sound image
localization control coefficient.
When the sound image localization control is off, the DSP 7 performs signal processing of
mixdown of the input multi-channel signal, and converts it into a two-channel sound
reproduction signal matched to the sound characteristic of the two-channel headphone 3 and
outputs it. Take control.
[0044]
Further, the third of the selection control is to detect the connection state of the headphones 2
and 3 in a state where the sound image localization control is on, and control so as to become a
sound image localization control coefficient matched to the characteristics of the multichannel
headphone 2 or Control is performed so as to obtain a sound image localization control
coefficient that matches the characteristics of the 2-channel headphone.
The setting control is performed as follows.
[0045]
That is, as shown in the flowchart of FIG. 4, first, in step S1, it is determined whether or not the
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multi-channel headphone 2 is connected by the connection of the connectors 10 and 17. If it is
connected, the process proceeds to step S2 and the jack 12 and It is determined whether or not
the 2-channel headphone is connected by the connection of the plug 18. If it is not connected in
step S1, the process proceeds to step S3 to similarly determine whether the 2-channel
headphone is connected.
If it is connected in step S2, the process proceeds to step S4, and even though both the
multichannel headphone 2 and the two channel headphone 3 are connected, the sound image
localization control coefficient matched to the characteristics of the multichannel headphone 2 is
obtained. To give priority to control. If the connection is not made in step S2, the process
proceeds to step S5, and control is performed so that the sound image localization control
coefficient matched to the characteristics of the multi-channel headphone 2 is obtained. Further,
if connected in step S3, the process proceeds to step S6, and control is performed so that the
sound image localization control coefficient matched to the characteristics of the two-channel
headphone 3 is obtained. And when not connected by step S3, and after processing of step S4step S6, it returns to step S1.
[0046]
In the case of control in step S4, the reproduction by the two-channel headphone 3 is set to the
sound image localization control coefficient matched to the characteristics of the multi-channel
headphone 2, and the front left and right channels among the multichannel acoustic
reproduction signals Signals equivalent to the audio signals FL and FR are output to the left and
right audio signals L and R for two channels.
[0047]
(Embodiment 2) In the above description, in response to the on / off control of the sound image
localization control mode by the operation means for setting whether to perform the sound
image localization control, the DSP 7 is inputted when it is off. While performing signal
processing of mixdown of a multi-channel signal, control is performed to convert into an audio
reproduction signal of two channels in accordance with the acoustic characteristic of the twochannel headphone 3 and output it.
[0048]
On the other hand, it is the same in that sound image localization control is possible so that the
multi-channel sound reproduction signal output from the signal processing means can be
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localized at a position where the sound image is separated when listening with headphones.
When the connection of only the jack 12, the plug 18, which is the second output connection
means, is detected, the DSP 7 mixes the input multi-channel signal regardless of the on / off state
of the sound image localization control mode. While performing signal processing of down, it is
constituted so that it may control to convert into a 2-channel sound signal according to the
acoustic characteristic of 2-channel headphone, and to output.
According to such a configuration, reproduction by in-head localization with normal two
channels can be performed only by connecting only the second output connection unit regardless
of on / off of sound image localization control.
[0049]
(Third Embodiment) In addition, similarly to the point that sound image localization control is
possible so that the multi-channel sound reproduction signal output from the signal processing
means can be localized at a distant position when listening with headphones. However, when the
connection of the connectors 10 and 17 which are the first output connection means is detected,
or when the connection of both the first output connection means and the second output
connection means is detected, The DSP 7 is controlled so as to obtain a sound image localization
control coefficient matched to the characteristics of the multi-channel headphone 2, and the
initial value of the sound image localization control is set at the center of the sound image
localization position.
According to this aspect, by connecting the first output connection means, the state of sound
image localization control can always be set to the central predetermined control state.
[0050]
As described above, according to the present invention, it is an acoustic reproduction apparatus
configured to be able to connect multi-channel headphones and 2-channel headphones, and
processing reproduction signals corresponding to multi-channel sound sources. Signal processing
means for outputting multi-channel or two-channel sound reproduction signals; multi-channel
amplifier for amplifying multi-channel sound reproduction signals output from the signal
processing means; A first output connection means, a two-channel amplifier for amplifying a twochannel audio reproduction signal, a second output connection means connected to an output of
the two-channel amplifier, and a control means for controlling the signal processing means
Control means are provided when multi-channel headphones are connected to said first output
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connection means In the case where a two-channel headphone is connected to the second output
connection means, this is detected, and the reproduction signal state of the signal processing
means is selectively controlled corresponding to each connection. An advantageous effect is
obtained.
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