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JP2007116643

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DESCRIPTION JP2007116643
In a high fidelity audio reproducing apparatus for driving a speaker by a plurality of signal
processing apparatuses such as a bi-amplifier and a multi-amplifier system, a high fidelity signal
processing circuit is used and multi-channel signals are controlled in conjunction. There has been
no method which has a function and can arbitrarily change the combination of signal processing
circuits. An audio signal processing apparatus is provided with a plurality of signal processing
circuits and has a function of arbitrarily switching signal processing circuits to be used. An audio
signal processing apparatus characterized in that a combination of a plurality of signal
processings can be performed arbitrarily and easily because the signal processing circuits can be
connected in series or in parallel with other signal processing circuits. [Selected figure] Figure 1
Audio signal processor
[0001]
The present invention is an audio signal processing apparatus that inputs an audio signal,
processes the volume of the audio signal, the sound quality, the frequency characteristic, etc., and
outputs the selected signal processing circuit, selecting and combining arbitrary signal
processing circuits. The present invention relates to an audio signal processing apparatus
capable of performing adjustment and control of frequency characteristics.
[0002]
As a device for reproducing high fidelity audio, a signal generator such as a compact disc player,
a preamplifier for controlling the volume and sound quality of a signal output from the signal
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processing device, and a speaker are driven. An audio playback device has been used which
comprises a power amplifier, a speaker system and the like.
Furthermore, in order to perform audio reproduction with higher fidelity, the so-called biamplifier drive system in which the reproduction band of the speaker is divided by frequency
band by the network and each is driven by two power amplifiers, and the frequency band by
channel divider A multi-channel amplifier system has been proposed in which a speaker is driven
by a power amplifier for each band after division.
[0003]
FIG. 7 shows an example of a conventional bi-amplifier-driven audio reproduction apparatus. In
FIG. 7, 77 is an audio signal generator such as a compact disc player, 71 is an audio signal
processor with a first volume controller, 72 is an audio signal processor with a second volume
controller, 73 is a second One power amplifier 74 is a second power amplifier, 75 is a bass
speaker, and 76 is a treble speaker. Here, the 75 low-pitch speaker and the high-pitch speaker 76
are provided with frequency limiting elements called dividing networks at the input section, but
they are omitted in the figure.
[0004]
The audio signal from the signal generator 77 is input to the first signal processing device 71.
The sound quality is adjusted as necessary in addition to the volume adjustment, and then the
first power amplifier 73 drives the bass speaker system 75. . On the other hand, the output of the
first audio signal processing unit 71 is input to the second signal processing unit 72, and by
setting the second volume controller appropriately here, the relative volume to the high
frequency range of the high tone side is obtained. Adjust. The output of the second audio signal
processor 72 is input to the second power amplifier 74 to drive the treble speaker system 76. As
shown in this example, in the bi-amplifier system, two volume regulators are required according
to the function of the main volume adjustment and the function of relative level adjustment, and
usually, audio signal processing devices such as two preamplifiers are connected by cables
Methods have generally been used.
[0005]
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As described above, when constructing an audio reproducing apparatus by the bi-wiring system
or the multi-channel amplifier system for high fidelity reproduction, it is necessary to
interconnect them using a plurality of conventional single-piece audio processing apparatuses.
The In addition, in order to change the configuration of the signal processing device or the power
amplifier, it is necessary to turn off the power supply and then reconnect the cable connection of
the device each time, and it was not possible to switch instantly. Therefore, as a matter of course,
it is difficult to switch the signal processing device according to the use situation or the music
signal source, and it is not easy to compare the signal processing device and the power amplifier
alone.
[0006]
Also, with the recent advancement of multi-channel audio reproduction technology, a method of
controlling a plurality of electronic volumes by digital signals has also been proposed, as shown
in, for example, Patent Document 1 as an example of performing a plurality of volume control
functions by one unit. There is. As a further advanced control technology, there is also proposed
a method of selecting a signal processing circuit to be used as needed by using a network
technology as shown in the example of Patent Document 2.
[0007]
Patent Publication No. 2003-298371 Patent Publication No. 9-130716
[0008]
However, using such an electronic circuit has the following problems as an audio reproducing
apparatus for the purpose of advanced high fidelity reproduction.
Here, focusing on the volume control function in particular will be described in detail below.
Those that simply use a variable resistor (volume), those that use an attenuator that combines a
resistor and a rotary switch, or those that use a resistor and an analog switch as functional
elements for achieving volume control Furthermore, as a variable resistance element, one using a
source-drain resistance of a field effect transistor, and one that controls gain by other electronic
circuits are proposed. However, when an analog switch is used, there are effects such as residual
resistance at the time of switch ON and capacitance at the time of OFF, and volume control
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mechanisms using other electronic devices have similar disadvantages, and they are not
necessarily required for high fidelity reproduction. The ideal volume control function was not
obtained. Among them, what is considered to be superior from the viewpoint of high fidelity
reproduction is considered to be a method of selecting the resistance value with a rotary switch
to determine the amount of signal attenuation, and the highest grade audio signal processing
This method is preferably used for the device. However, since this type of volume controller can
not be used in the above-mentioned conventional automatic control by digital signal, it is used
only in a single-piece audio signal processing apparatus having a classical configuration, and the
above-mentioned problem of connection switching is not easy. was there.
[0009]
Also, in the above-mentioned bi-amp system, two audio signal processing circuits are required,
but the main purpose is the volume control function, and if there is an audio signal processing
device equipped with two volume controllers, Although it should be very efficient because it can
share cases, power supplies, etc., such audio signal processing devices are not at all widespread.
The reason is that even if two units of volume control are provided in one unit, there is no
freedom in the combination of their interconnections, and the method of use is limited, so it is
used especially as a high fidelity audio playback device. It is thought that there is a difficult side.
[0010]
Again, there is an example of improvement in combination with the network technology as in
Patent Document 2 with regard to the diversity of combinations, but the performance of the
signal processing device used there is also high-fidelity audio It can not be said that it has
sufficient performance from the viewpoint of the playback device.
[0011]
Further, in the examples of Patent Document 1 and Patent Document 2 described above, since
the digital signal for control is present inside the audio signal processing apparatus, these digital
signals may interfere with the analog signal, which may cause deterioration of the analog signal.
there were.
As described above, the signal processing circuit such as an electronic volume and the signal
processing device by digital control are not inherently good methods as a method of a high
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fidelity audio reproducing device.
[0012]
As described above, in a high fidelity audio reproducing apparatus, there has been no way to
satisfy the contradictory conditions for maintaining the diversity of apparatus combinations and
the high quality that can withstand high fidelity reproduction. Therefore, it is still necessary to
change the connection between the audio signal processing apparatus main body and the audio
reproduction apparatus such as a power amplifier and a signal source such as a CD player, in
order to comprehensively optimize the apparatus or cope with the situation. I had no choice but
to turn off the power and reconnect. As a result, not only the method of use becomes complicated
but also accurate audition comparison can not be performed, which is an obstacle to the
improvement of the overall system performance. The present invention has been made to solve
these problems.
[0013]
An audio signal processing apparatus comprising: a plurality of signal processing circuits, and a
function of arbitrarily switching signal processing circuits to be used, wherein the one signal
processing circuit is provided. An audio signal processing apparatus characterized in that a
combination of a plurality of signal processings can be performed arbitrarily and easily by being
connected after other signal processing circuits.
In the audio signal processing apparatus, since the signal processing circuit or the signal
processing apparatus can be switched instantaneously, the signal processing circuit can be
changed to a necessary one according to the situation, and the performance comparison of the
main body of the signal processing apparatus can be easily compared. Will be clearly understood.
Moreover, even if the overall configuration of the audio system is changed, it can be coped with
only by switching the switch, and the combination of audio devices can be easily changed only by
the switch, so that the best audio system configuration can be optimized accurately and easily. it
can.
[0015]
Further, in the case of a signal processing circuit having a plurality of components, for example,
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in the case of a volume controller, interlocked output can be easily obtained, so that connection
of a bi-amplifier and a multi-amplifier can be coped with.
[0016]
Furthermore, not only the circuit becomes simple because it is well matched with the
conventional high-fidelity signal processing circuit, does not include digital circuits that cause
deterioration of sound quality, and does not use complicated electronic control. There is an effect
that there is no concern about the deterioration of the sound quality and unnecessary costs can
be suppressed.
Hereinafter, embodiments of the present invention will be described in detail with reference to
the drawings.
[0017]
FIG. 1 is a circuit diagram for explaining the first embodiment of the audio signal processing
apparatus of the present invention.
In FIG. 1, 11 is a first signal processing circuit, 12 is a second signal processing circuit, 13 is a
signal processing circuit selection switch, 14 is an input signal selection switch of the first signal
processing circuit 11, 15 is a second signal It is an input signal selection switch of the processing
circuit 12.
Here, the signal processing circuit 11 is, for example, a signal processing circuit configured of a
volume controller and an amplifier, or may be a signal processing circuit simply including a
single volume controller such as a volume.
[0018]
When the signal processing circuit selection switch 13 is on the first signal processing circuit 11
side, the signal input from the signal input terminal 16 passes through the signal processing
circuit 11 and a signal is output from the main signal output terminal 17. When the signal
processing circuit selection switch 13 is on the side of the second signal processing circuit 12, a
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signal is output through the second signal processing circuit 12. By switching the signal
processing circuit selection switch 13 in this manner, it is possible to instantaneously switch the
signal processing circuit to be used.
[0019]
Furthermore, with the signal processing circuit selection switch 13 on the first signal processing
circuit 11 side, the input signal selection switch 15 is on the output side of the first signal
processing circuit. An audio signal having a size interlocked with the first signal processing
circuit 11 is output to the auxiliary signal output terminal 19, and the relative magnitude of the
signal can be independently controlled by the second signal processing circuit 12. Although FIG.
1 shows an example in which a rotary switch is used as the selection switch of the signal
processing circuit and the input signal selection switch, it goes without saying that any other
switch such as a relay or an analog switch can be used.
[0020]
FIG. 2 is a block diagram for explaining the use of the first embodiment of the audio signal
processing apparatus of the present invention. In FIG. 2, 20 is an audio signal processing
apparatus of the present invention, 27 is a signal source such as a CD player, and 21 and 22 are
a first signal processing apparatus and a second signal processing apparatus of the present
invention, respectively. Here, the first and second signal processing devices can be simply
considered as volume controllers. Further, power amplifiers 23 and 24 are respectively
connected to the bass speaker 25 and the treble speaker terminal 26 of the speaker system, and
are connected in a so-called bi-amplifier drive.
[0021]
Here, in a state where the setting of the selection switch of the signal processing circuit is the
first signal processing circuit 21, the input signal selection switch of the second signal processing
circuit 22 is set to the output side of the signal processing circuit 21. . In this state, the output of
the second signal processing circuit 22 is a signal interlocked with the first signal processing
circuit 21. That is, when the first signal processing circuit 21 is adjusted, the main signal output
and the sub signal output can be adjusted in conjunction with each other, and the signal
processing circuit 22 is adjusted to adjust the signal level of the sub signal output to the main
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signal. It can be set arbitrarily. By this, the main signal output is connected to the bass side 23 of
the bi-amplifier drive power amplifier, and the sub-signal is similarly connected to the high-tone
amplifier 24 for the bi-amplifier drive power amplifier, thereby processing the entire volume
during bi-amplifier drive. At 21, the level adjustment on the treble side can be performed by the
signal processing circuit 22. Of course, as a selection switch of the signal processing circuit used
here, any switch such as a rotary switch, a slide switch, a relay, and an analog switch can be used.
[0022]
As described above, by combining the audio signal processing device of the present invention
and two power amplifiers, bi-amplifier driving can be performed without any problems. Also, by
appropriately switching the signal processing circuit selection switch and the input signal
switching switch, the signal processing circuits responsible for main volume adjustment and sub
volume adjustment can be interchanged, so signal processing circuits of different types for signal
processing circuits 21 and 22 It goes without saying that the optimization of the entire audio
reproduction apparatus can be easily performed using
[0023]
Next, a second embodiment of the present invention will be described using the circuit
configuration diagram of FIG. FIG. 3 is a circuit wiring diagram when the number of signal
processing circuits is three. In FIG. 3, 301 is a first signal processing circuit, 302 is a second
signal processing circuit, 303 is a third signal processing circuit, 304 is a signal processing
circuit selection switch, and 305 is an input of the first signal processing circuit 301 A signal
selection switch 306 is an input signal selection switch of the second signal processing circuit
32, and 307 is an input signal selection switch of the third signal processing circuit 303.
[0024]
When the signal processing circuit selection switch 304 is on the first signal processing circuit
301 side, the signal input from the input terminal 308 passes through the signal processing
circuit 301 and is output from the main signal output terminal 310. Similarly, when the signal
processing circuit selection switch 304 is on the second signal processing circuit side, a signal is
output through the second signal processing circuit 302. Similarly, the third signal processing
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circuit 303 can be selected by switching the signal processing circuit selection switch 304.
[0025]
In addition to the output of the first signal processing circuit 301, the second input signal
selection switch 306 can select the output of the third signal processing circuit 303. Likewise,
the first signal selection switch 305 and the third signal selection switch 307 can arbitrarily
select the output signals of the other two signal processing circuits.
[0026]
Further, in FIG. 3, the first to third signal input switches 305, 306, and 307 are provided with
contacts for connecting the signal from the signal input terminal 308, and by combining with
this, the signal processing circuit selection switch In addition to the signal processing circuits
selected in 304, signal processing circuits can be connected in parallel. When the signal
processing circuit is, for example, a volume controller, the volume processing circuit selected by
the signal processing circuit selection switch 304 and the volume controller connected by the
input signal selection switch can change the volume independently.
[0027]
FIG. 4 is a block diagram for explaining the use of the audio signal processing apparatus
according to the second embodiment of the present invention. In FIG. 4, 400 is an audio signal
processing apparatus of the present invention, 414 is a signal generator such as a CD player, and
407 is a main signal output 404, sub signal output 405, and sub signal output 406 of the audio
signal processing apparatus of the present invention. Channel dividers. Further, power amplifiers
408, 409 and 410 are respectively connected to the bass speaker system 411, the mid tone
speaker system 412 and the high tone speaker system 413 through channel dividers 407, and
so-called multi-amplifier type audio playback apparatus Configured.
[0028]
Here, in a state where the selection switch of the signal processing circuit is the first signal
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processing circuit 401, the input signal selection switch of the second signal processing circuit
402 is set to the output side of the signal processing circuit 401. The output of the signal
processing circuit 402 is a signal interlocked with the first signal processing circuit 401.
Similarly, by setting the input signal selection switch of the signal processing circuit 403 to the
output side of the signal processing circuit 401, the output of the third signal processing circuit
402 becomes a signal interlocked with the first signal processing circuit 401. As a result, the
main signal is connected to the bass side of the multi-amplifier, the sub signal 405 is connected
for the mid tone of the multi amplifier, and the sub signal 406 is connected for the high tone of
the multi amplifier. With the signal processing circuit 401, the volume adjustment can be
performed by the signal processing circuit 402, and the level adjustment for high-pitched sound
can be performed by the signal processing circuit 403.
[0029]
Further, although the example in which the main signal processing circuit is the signal
processing circuit 401 has been described above as an example, it is needless to say that it is also
possible to set the adjustment of the main volume to 402 or 403. The signal processing circuits
do not have to be the same ones, and it is possible to install different kinds of ones and freely
change the combination. As described above, by combining the audio signal processing device of
the present invention, three power amplifiers, and a three-band speaker system, multi-amplifier
driving can be performed without any problems.
[0030]
Furthermore, the third embodiment will be described with reference to FIG. Although the
simplest example of selecting a plurality of signal processing circuits has been described so far,
as shown in FIG. 5, the unit part of the signal processing circuit may be a combination of the
signal processing circuit 501 and the amplifier 502. In addition to the signal processing circuit, a
band pass filter 503 or a graphic equalizer unit 504 may be combined.
[0031]
A fourth embodiment will be further described with reference to FIG. So far, the example of
incorporating a plurality of signal processing circuits has been described, but as shown in FIG. 6,
the signal processing circuit is provided externally, and as the signal processing circuit of the
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present invention, input and output for connecting the external signal processing circuit It may
be only provided with a terminal. Here, 601 and 602 are a preamplifier 1 and a preamplifier 2
connected from the outside, and 603 is a graphic equalizer connected to Akibe. In FIG. 6, the
main body of the present invention functions as a universal selector for selecting and
interconnecting a plurality of signal processing circuits.
[0032]
The circuit block diagram which shows the 1st Example of this invention The block diagram
explaining the usage form of the 1st Example of this invention The circuit block diagram which
shows the 2nd Example of this invention The 2nd example of this invention Block diagram for
explaining the use form of the circuit diagram showing the third embodiment of the present
invention circuit diagram showing the fourth embodiment of the present invention block diagram
of an audio reproduction apparatus using the conventional signal processing apparatus
Explanation of sign
[0033]
11 first signal processing circuit 12 second signal processing circuit 13 signal processing circuit
selection switch 14 input signal selection switch of first signal processing circuit 11 input signal
selection switch of second signal processing circuit 12 signal input terminal 17 main signal
output terminal 18 first auxiliary signal output terminal 19 second auxiliary signal output
terminal 200 audio signal processing device of the present invention 201 first signal processing
circuit 202 second signal processing circuit 203 main signal output terminal 204 auxiliary signal
Signal output terminal 205 First power amplifier 206 Second power amplifier 207 Loudspeaker
208 High frequency speaker 209 Signal source 301 First signal processing circuit 302 Second
signal processing circuit 303 Third signal processing circuit 304 Signal Processing circuit
selection switch 305 Input signal selection switch of first signal processing circuit 32 30 Input
signal selection switch of second signal processing circuit 307 Input signal selection switch of
third signal processing circuit 303 Signal input terminal 309 First sub signal output terminal
310 Main signal output terminal 311 First sub signal output terminal 312 second auxiliary signal
output terminal 312 third auxiliary signal output terminal 400 audio signal processing device of
the present invention 401 first signal processing circuit 402 second signal processing circuit 403
third signal processing circuit 404 main signal output 405 Sub-signal output 406 Sub-signal
output 407 Channel divider 408 Power amplifier for middle tone 409 Power amplifier for highpitched sound 411 Power amplifier for high-pitched sound 411 Speaker for low-pitched sound
413 Speaker for high-pitched sound Band pass filter 504 graph Iick equalizer 505 Signal
processing circuit selection switch 506 First input selector switch 507 Second input selector
switch 508 Third input selector switch 509 Signal input terminal 510 Secondary signal output
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terminal 511 Main signal output terminal 512 Secondary signal output terminal 513 Secondary
Signal output terminal 601 first preamplifier 602 second preamplifier 603 graphic equalizer 604
signal processing circuit selection switch 605 first input selector switch 606 second input
selector switch 607 third input selector switch 608 signal input terminal 609 sub signal Output
terminal 610 Main signal output terminal 611 Secondary signal output terminal 612 Secondary
signal output terminal 71 First audio signal processor 72 Second audio signal processor 73 First
power amplifier 74 Second power amplifier 75 Bass Speaker system 76 High-pitch speaker
system 77 Signal generator
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