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DESCRIPTION JP2007248918

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DESCRIPTION JP2007248918
PROBLEM TO BE SOLVED: To provide a noise control device capable of earning a sufficient noise
control amount by individually adjusting output levels of an audio signal and a noise control
signal. SOLUTION: A noise control signal generating unit for generating a noise control signal for
muting noise, a first amplification unit for amplifying a signal from an audio unit, a second
amplification unit for amplifying the noise control signal, and And an audio unit having mixing
means for mixing the signal from the first amplification means and the signal from the second
amplification means and supplying the mixed signal to the speaker as an audio signal.
Noise control device
[0001]
The present invention relates to a noise control device that actively removes the influence of
external noise on audio reproduction sound from radios, televisions, recording media and the
like.
[0002]
A conventional noise control device will be described with reference to FIG.
FIG. 5 is a block diagram showing the configuration of a noise control device according to an
embodiment of the prior art.
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[0003]
The noise control device is constituted by an audio head unit 60 and a separate ANC unit (active
noise processing unit) 70 as shown in FIG. In the audio head unit 60, an audio section selectively
outputting audio signals from the radio tuner 63 and the cassette deck 64, a mixer 65 for mixing
the signal from the audio section and the signal output from the ANC unit 70 , And a power
amplifier 60 for amplifying the audio signal from the mixer 65. Further, an ANC controller 71 is
incorporated in the ANC unit 70, and a noise canceller circuit or the like is mounted which
generates an audio signal of the opposite phase to the surrounding noise to cancel the noise.
[0004]
An audio signal output from the radio tuner 63 or the cassette deck 64 or the like is input to the
mixer 65 disposed at a position upstream of the power amplifier 66, and a mute is output from
the ANC controller 71 for the input audio signal. The signal is superimposed, amplified by the
power amplifier 66, and output from the speaker 67.
[0005]
In the noise control device, an audio head unit 60 having a noise control function is constructed
in order to control external noise and muffled sound of the engine.
These are speakers that simultaneously output an audio signal and a control sound signal, and
the user can listen to his / her favorite audio under a noise-controlled environment.
[0006]
The following are prior art documents relating to the invention of this application. Patent
document 1: JP-A-2001-282255
[0007]
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In the internal processing of the noise control device described above, since the output from the
ANC controller 71 and the audio signal use the same power amplifier 66, it is difficult to adjust
the noise control output level individually and sufficiently, and the noise control amount is
sufficient It is difficult to earn Further, since the audio signal and the noise control signal are
amplified by one power amplifier 66, the power amplifier 66 may be excessively burdened to
cause heat generation.
[0008]
The present invention solves the above-mentioned problems, and it is an object of the present
invention to provide a noise control device capable of individually adjusting the output levels of
an audio signal and a noise control signal and earning a sufficient noise control amount.
[0009]
The present invention achieves the above-mentioned object, and comprises a noise control signal
generation unit for generating a noise control signal for muting noise, a first amplification means
for amplifying a signal from an audio unit, and the noise control signal. An audio unit comprising:
second amplification means; and mixing means for mixing the signals from the first amplification
means and the second amplification means and supplying the mixed signal to the speaker as an
audio signal.
[0010]
Further, a noise control signal generating unit for generating a noise control signal for muting
noise, a first amplification unit for amplifying a signal from an audio unit, a second amplification
unit for amplifying the noise control signal, and the first amplification Means and a double voice
coil speaker unit for reproducing an audio signal from the second amplification means.
[0011]
Also, an audio unit having a first amplification means for amplifying a signal from an audio unit,
a noise control signal generation unit provided separately from the audio unit and generating a
noise control signal for muting noise, and the noise control A noise control unit having a second
amplification means for amplifying a signal; and a double voice coil speaker unit for reproducing
the sound signal from the first amplification means and the noise control signal from the second
amplification means. It is a feature.
[0012]
Also, an audio unit having a first amplification means for amplifying a signal from an audio unit,
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a noise control signal generation unit provided separately from the audio unit and generating a
noise control signal for muting noise, and the noise control It is characterized by comprising a
noise control unit having a second amplification means for amplifying a signal, and a plurality of
speaker units for reproducing audio signals from the first amplification means and the second
amplification means.
[0013]
In addition, the plurality of speaker units comprises a treble band, a midrange band speaker unit,
and a double voice coil speaker unit, and the audio signal from the first amplification means is
the loudspeaker unit for the high range band and the midrange band. And the double voice coil
speaker unit, and the noise control signal from the second amplification means is input to the
double voice coil speaker unit.
[0014]
As described above, according to claim 1 of the present invention, the amplification degree of the
audio signal and the amplification degree of the noise control signal can be adjusted separately,
so that the noise control signal can be controlled without being interlocked with the amplification
of the audio signal. Therefore, noise can be silenced more effectively.
[0015]
According to the second aspect, by using the double voice coil speaker, the mixing circuit
provided inside the audio unit can be omitted, so the system of the noise control device can be
simplified (reduced).
[0016]
According to the third aspect of the present invention, by providing the second amplification
means in the noise control unit, the configuration becomes independent from the audio unit, so
even when the audio unit is replaced with another audio unit, the noise control amount by the
replacement Can prevent the deterioration of
Further, by using the double voice coil speaker, the audio unit can be easily connected to the
speaker, so that the user can freely exchange the audio unit, and the mixing circuit can be
omitted.
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[0017]
According to the fourth and fifth aspects of the present invention, in a speaker system that
reproduces signals divided into a plurality of sound range bands from the audio unit, the system
can be incorporated into a speaker that matches the sound range band of noise and can be
controlled.
Also, in the case of a system composed of a plurality of speakers, it can be applied to all output
channels, and can be applied to only a part.
[0018]
A part of the case where the noise control device of the present invention is applied to an onvehicle audio apparatus will be described with reference to FIGS. 1 to 4.
First Embodiment A first embodiment of the present invention will be described with reference to
FIG.
FIG. 1 is a block diagram showing a configuration of a noise control device according to a first
embodiment of the present invention.
[0019]
The noise control device is configured by an audio unit 10 and a separate noise control signal
generator 30 as shown in FIG.
In the audio unit 10, an audio unit 20 for selectively generating and outputting an audio signal
from an FM, AM radio tuner, CD, MD deck or the like by a changeover switch (not shown), and
output from the audio unit 20 Power amplifier (corresponding to a first amplification means) 21
for amplifying an audio signal, and a second power amplifier (corresponding to a second
amplification means) 22 for amplifying a noise control signal from a noise control signal
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generation unit 30 described later. And a mixer 23 configured to superimpose (mix) the noise
control signal amplified by the second power amplifier 22 on the audio signal amplified by the
first power amplifier 21.
[0020]
The noise control signal generation unit 30 is equipped with a noise canceller circuit that
generates a noise control signal having a phase opposite to that of the surrounding noise (noise)
to cancel the noise, and the generated noise control signal having the opposite phase is an audio
unit. The second power amplifier 22 is amplified by a second power amplifier 22 provided in FIG.
Next, an audio signal obtained by superimposing the noise control signal of the opposite phase
amplified by the second power amplifier 22 by the mixer 23 on the audio signal amplified by the
first power amplifier 21 is input to the speaker 40 and the surrounding noise Is muted and
output.
[0021]
As described above, according to the noise control device of the first embodiment of the present
invention, the amplification degree of the audio signal and the amplification degree of the noise
control signal can be separately adjusted. It becomes possible to amplify to an optimal noise
control signal, and the user can listen to his / her favorite audio under an environment where
noise such as external noise and engine squeaky noise is controlled (muted).
Although the noise control apparatus according to the present invention has been described for
the on-vehicle audio apparatus, the present invention is applicable to any audio apparatus used
in an environment where external noise is added.
Second Embodiment A second embodiment of the present invention will be described with
reference to FIG. FIG. 2 is a block diagram showing a configuration of a noise control device
according to a second embodiment of the present invention. The second embodiment is a
modification of the first embodiment, and the same reference numerals are given to the same
configuration as the first embodiment and the description will be omitted. As shown in FIG. 2, the
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noise control device is configured by an audio unit 11 and a separate noise control signal
generation unit 30. In the audio unit 11, an audio unit 20, a first power amplifier 21, a second
power amplifier 22, and the like are configured. The audio signal amplified by the first power
amplifier 21 and the noise control signal of the opposite phase amplified by the second power
amplifier 22 are input to the double voice coil speaker 41 and the surrounding noise is silenced
and output.
[0022]
As described above, according to the noise control device of the second embodiment of the
present invention, the audio signal amplified by the first power amplifier 21 and the second
power amplifier can be obtained by using the double voice coil speaker 41 as the speaker. Since
the noise control signal in reverse phase amplified at 22 is directly input to the double voice coil
speaker 41, the mixing circuit can be omitted from the audio unit 11. As a result, the system of
the noise control device can be simplified and miniaturized, and the cost can be reduced. Besides,
the same effect as the first embodiment can be obtained. Third Embodiment The third
embodiment of the present invention will be described with reference to FIG. FIG. 3 is a block
diagram showing the configuration of a noise control system according to a third embodiment of
the present invention. The third embodiment is a partial modification of the second embodiment,
and the same reference numerals are given to the same configuration as the second embodiment
and the description will be omitted.
[0023]
The noise control device is configured by an audio unit 12 and a separate noise control unit 35
as shown in FIG. The audio unit 12 includes an audio unit 20, a first power amplifier 21 for
amplifying an audio signal output from the audio unit 20, and the like. The noise control unit 35
includes a noise control signal generation unit 31 and a second power amplifier 22 for
amplifying the noise control signal of the opposite phase output from the noise control signal
generation unit 31. The audio signal amplified by the first power amplifier 21 and the noise
control signal of the opposite phase amplified by the second power amplifier 22 are input to the
double voice coil speaker 41 and the surrounding noise is silenced and output.
[0024]
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As described above, according to the noise control device of the third embodiment of the present
invention, by providing the second power amplifier 22 for amplifying the noise control signal of
the opposite phase in the noise control unit 35 Since the configuration is independent, even
when the audio unit 12 is replaced with another audio unit, deterioration of the noise control
amount due to replacement can be prevented. In addition, since the audio unit 12 can be easily
connected to the speaker by using the double voice coil speaker 41, the user can easily replace
the audio unit 12 with another audio unit and freely exchange it. it can. Besides, the mixing
circuit can be omitted. As a result, the system of the noise control device can be simplified and
miniaturized, and the cost can be reduced. Besides, the same effect as the first embodiment can
be obtained. Fourth Embodiment A fourth embodiment of the present invention will be described
with reference to FIG. FIG. 4 is a block diagram showing the configuration of a noise control
system according to a fourth embodiment of the present invention. The fourth embodiment is a
modification of the third embodiment, and the same reference numerals are given to the same
configuration as the third embodiment and the description will be omitted.
[0025]
The noise control device is configured by an audio unit 12 and a separate noise control unit 35
as shown in FIG. The audio signal amplified by the first power amplifier 21 provided in the audio
unit 12 is input to each of the double voice coil speaker 41, the mid band speaker 42 and the
high band speaker 43. In addition, the noise control signal in reverse phase amplified by the
second power amplifier 22 provided in the noise control unit 35 is input to the same double
voice coil speaker 41 as the speaker to which the audio signal is input, and the surrounding noise
is silenced. Is output.
[0026]
As described above, according to the noise control device of the fourth embodiment of the
present invention, the double voice coil speaker matched with the sound range band of noise to
the speaker that reproduces the signal divided into a plurality of sound range bands from the
audio unit 12 By incorporating and controlling 41, the mid-range band speaker 42 and the highrange band speaker 43, it is possible to enjoy a realistic sound with a balanced sound from bass
to treble, with surrounding noise muted.
[0027]
It is a block diagram which shows the structure of the noise control apparatus of Embodiment 1
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of this invention.
It is a block diagram which shows the structure of the noise control apparatus of Embodiment 2
of this invention. It is a block diagram which shows the structure of the noise control apparatus
of Embodiment 3 of this invention. It is a block diagram which shows the structure of the noise
control apparatus of Embodiment 4 of this invention. It is a block diagram which shows the
structure of the noise control apparatus of one Embodiment of prior art.
Explanation of sign
[0028]
10, 11, 12 ... audio unit 20 ... audio unit 21 ... first power amplifier 22 ... second power amplifier
23 ... mixer 30, 31 ... noise control signal generating unit 35 · · · Noise control unit 40 · · · Speaker
41 · · · double voice coil speaker 42 · · · mid range speaker 43 · · · high range speaker
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