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JP2010074230

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DESCRIPTION JP2010074230
An audio signal processing apparatus and an audio output apparatus capable of reducing aural
noise and preventing deterioration of sound quality of audio output from a speaker without
lowering a band of high frequency components. I assume. An audio signal processing apparatus
that processes an audio signal from wireless communication and outputs audio to a speaker, and
an audio signal receiving unit that receives an audio signal from wireless communication, and the
audio signal receiving unit receives the audio signal receiving unit. And a delay unit for delaying
the time for outputting the high frequency component of the audio signal to the speaker more
than the low and middle frequency components of the audio signal. [Selected figure] Figure 1
Audio signal processing device, audio output device
[0001]
The present invention relates to an audio signal processing device and an audio output device.
[0002]
When a user listens to a radio with a car audio mounted in a car, the radio wave of the received
radio is not stable due to the movement of the car, so high frequency noise of the radio is often
output from the speaker.
Therefore, conventionally, in order to reduce high frequency noise of the radio, the high
frequency noise is cut by lowering the band of the high frequency component of the audio signal.
09-05-2019
1
[0003]
In addition, in order to solve the sense of incongruity in the sense of hearing that the high
frequency component and the low / middle frequency component of the audio signal do not
reach the user's ear simultaneously, by providing a delay circuit to delay the output of the high
frequency component There is disclosed a technique capable of adjusting the time for reaching a
user's ear of a medium frequency component to be simultaneous and eliminating a sense of
discomfort in hearing (see Patent Documents 1 to 5). In addition, under an environment where
the distance between the full range speaker and the woofer speaker is large, a speaker is
developed in which the woofer speaker delays and outputs a low frequency signal than the full
range speaker by a delay circuit. The low frequency sound output from the woofer speaker can
be localized as if it is emitted from the direction of the full range speaker by the Hearth effect
(see Patent Document 6). Patent Document 1: Japanese Patent Application Laid-Open No. 984173 Patent Document 2: Japanese Patent Application No. 5-50899 Patent Document 2:
Japanese Patent Application No. 2002-369300 Patent Document: Japanese Patent Application
No. 7-20794 Patent Document 2: Japanese Patent Application Publication No. 2005-80079
[0004]
Conventionally, high frequency noise has been cut by lowering the frequency band of the high
frequency component of the audio signal in order to reduce high frequency noise of the radio,
but the sound quality output from the speaker is degraded by lowering the frequency band of the
high frequency component There was a problem that you
[0005]
Therefore, in the present invention, in view of the problems described above, an audio signal
processing apparatus capable of reducing audible noise and preventing deterioration of the
sound quality of audio output from a speaker without lowering the band of high frequency
components It aims at providing an audio output device.
[0006]
The present invention has devised the point which reduces the high frequency noise contained in
a high frequency ingredient on a user's hearing sense using a Haas effect, in order to solve the
subject mentioned above.
09-05-2019
2
[0007]
In detail, the audio signal processing device according to the present invention is an audio signal
processing device that processes an audio signal from wireless communication and outputs audio
to a speaker, and an audio signal receiving unit that receives an audio signal from wireless
communication And a delay unit for delaying the time of outputting the high frequency
component of the audio signal received by the audio signal receiving unit to the speaker more
than the low / mid frequency component of the audio signal.
[0008]
The audio signal receiving unit of the audio signal processing device according to the present
invention receives an audio signal from wireless communication.
Then, the delay unit delays the time for outputting the high frequency component of the audio
signal received by the audio signal receiving unit to the speaker more than the low and middle
frequency component of the audio signal.
As a result, the low and middle frequency components of the audio signal reach the user's ear
first, and then the high frequency components reach thereafter.
Therefore, the audio signal processing device according to the present invention can reduce high
frequency noise included in the high frequency component due to the Hearth effect in terms of
user's hearing.
Further, the audio signal processing device according to the present invention does not have to
lower the band of the high frequency component, so that it is possible to prevent the
deterioration of the sound quality of the sound output from the speaker.
[0009]
Here, the audio signal processing apparatus according to the present invention further includes a
filter for extracting at least low frequency components of the audio signal received by the audio
signal receiving unit, and the delay unit is an audio signal received by the audio signal receiving
unit. The time for outputting the high frequency component to the speaker may be delayed more
09-05-2019
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than the low frequency component extracted by the filter.
[0010]
Since the high frequency noise is included in the high frequency component, in the audio signal
processing device according to the present invention, the filter extracts at least the low frequency
component of the audio signal, thereby the low frequency component of the audio signal
including no high frequency noise and the high frequency noise And audio signals including
As a result, the low frequency component of the audio signal containing no high frequency noise
is output from the speaker first, and then the audio signal containing the high frequency noise is
output from the speaker, whereby the user's ear does not contain the high frequency noise. The
signal arrives first, followed by the audio signal containing high frequency noise. Therefore, the
audio signal processing apparatus according to the present invention can reliably reduce high
frequency noise on the user's hearing by the Haas effect. The filter may take out both high
frequency components as well as low frequency components of the audio signal. By extracting
both the low frequency component and the high frequency component of the audio signal, the
delay unit delays the time for outputting the high frequency component including the high
frequency noise from the speaker more reliably than the low frequency component not including
the high frequency noise. Is possible. As a result, it is possible to more reliably reduce high
frequency noise on the user's hearing.
[0011]
Furthermore, the audio signal processing device according to the present invention further
includes a frequency characteristic adjusting unit that adjusts at least a low frequency
component of the audio signal received by the audio signal receiving unit, and the delay unit
receives the audio signal receiving unit. The time for outputting the high frequency component of
the voice signal to the speaker may be delayed compared to the low frequency component
adjusted by the frequency characteristic adjusting unit.
[0012]
In the audio signal processing device according to the present invention, the frequency
characteristic adjusting unit adjusts at least the low frequency component of the audio signal to
clarify the sound image of the low frequency component, and the low frequency component of
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4
the audio signal containing no high frequency noise; It is possible to divide into an audio signal
including high frequency noise.
As a result, the low frequency component of the audio signal not containing high frequency noise
is output first from the speaker, and then the audio signal containing high frequency noise is
output from the speaker, whereby the user's ear does not contain high frequency noise The
signal arrives first, followed by the audio signal containing high frequency noise. Therefore, the
audio signal processing apparatus according to the present invention can reliably reduce high
frequency noise on the user's hearing by the Haas effect. The frequency characteristic adjusting
unit may adjust both high frequency components as well as low frequency components of the
audio signal. To clarify the sound image of both the low frequency component and the high
frequency component of the audio signal by adjusting both the low frequency component and
the high frequency component of the audio signal, and to surely separate the low frequency
component and the high frequency component of the audio signal Is possible. As a result, the
delay unit delays the time for outputting the high frequency component including the high
frequency noise more reliably than the low frequency component not including the high
frequency noise, thereby reducing the high frequency noise on the user's hearing more reliably
by the hearth effect. It is possible.
[0013]
Here, the audio output device according to the present invention is an audio output device
including the above-described audio signal processing device and a speaker that outputs audio
according to an audio signal from the audio signal processing device, wherein the speaker is The
low-frequency speaker for outputting the low frequency component of the audio signal and the
high-frequency speaker for outputting the high frequency component of the audio signal via the
delay unit may be provided.
[0014]
The audio output device according to the present invention divides the low frequency component
of the audio signal not containing high frequency noise and the high frequency component of the
audio signal containing high frequency noise by having the low frequency speaker and the high
frequency speaker. It is possible to output from.
Furthermore, the high frequency component speaker outputs the high frequency component of
the audio signal through the delay unit, whereby the high frequency component of the audio
09-05-2019
5
signal output from the high frequency component speaker can be reduced by the low frequency
of the audio signal output from the low frequency component speaker. It is possible to make the
output time slower than the frequency component. As a result, the low frequency component of
the audio signal not containing high frequency noise is output first from the speaker, and then
the audio signal containing high frequency noise is output from the speaker, whereby the user's
ear does not contain high frequency noise The signal arrives first, followed by the audio signal
containing high frequency noise. Therefore, the audio signal processing apparatus according to
the present invention can reliably reduce high frequency noise on the user's hearing by the
Hearth effect, and can prevent deterioration of the sound quality of the sound output from the
speaker.
[0015]
In addition, the audio output device according to the present invention may be provided as part
of a vehicle-mounted device. Even when radio waves of received wireless communication are not
stabilized due to movement of a car and high frequency noise of wireless communication is
output from a speaker, the voice output device according to the present invention is provided as
part of a vehicle-mounted device Thus, it is possible to cause an audio signal containing no high
frequency noise to reach the user's ear first and then an audio signal containing high frequency
noise to reach. As a result, the voice output device according to the present invention can reliably
reduce high frequency noise in the user's sense of hearing and prevent deterioration of the sound
quality of the voice output from the speaker by the Haas effect.
[0016]
According to the present invention, it is possible to provide an audio signal processing device and
an audio output device capable of reducing audible noise and preventing deterioration of the
sound quality of audio output from a speaker without lowering the band of high frequency
components. It is possible.
[0017]
Here, embodiments of the audio output device 1 and the audio signal processing device 2
according to the present invention will be described based on the drawings.
The following examples are illustrative, and the present invention is not limited thereto.
09-05-2019
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[0018]
FIG. 1 is a functional block diagram in which an audio signal processing device 2 in an audio
output device 1 according to a first embodiment of the present invention includes a frequency
characteristic adjusting unit 23 and a filter 24. Hereinafter, each configuration of the audio
output device 1 according to the first embodiment of the present invention will be specifically
described based on FIG. The voice output device 1 according to the first embodiment of the
present invention is provided as a part of a vehicle-mounted device.
[0019]
The audio signal processing device 2 is a device that processes an audio signal from wireless
communication and outputs audio to the speaker 4. The wireless communication in the first
embodiment is, for example, an AM radio or an FM radio. Hereinafter, the wireless
communication of the first embodiment will be described as a radio, but the wireless
communication is not limited to the radio. The audio signal processing device 2 includes an audio
signal receiving unit 21, a frequency characteristic adjusting unit 23, a filter 24, and a delay unit
25. Each configuration will be described below.
[0020]
The audio signal receiving unit 21 receives the audio signal from the radio received by the
antenna 5. The audio signal received by the audio signal receiving unit 21 is a signal having a
wide frequency range from low frequency components to high frequency components. Further,
since the voice output device 1 is provided as a part of the vehicle-mounted device, the radio
wave of the radio received by the antenna 5 is not stabilized by the movement of the car, and
high frequency noise is included. As a result, the audio signal receiving unit 21 receives an audio
signal containing high frequency noise.
[0021]
The frequency characteristic adjusting unit 23 adjusts the frequency characteristic of the audio
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signal received by the audio signal receiving unit 21. The frequency characteristic adjustment
unit 23 is, for example, an equalizer (EQ) that adjusts sound quality for each frequency band, and
in the first embodiment, has an equalizer 231 that adjusts high frequency components and an
equalizer 232 that adjusts low frequency components. . The equalizer 231 for adjusting the high
frequency component makes the sound image of the high frequency component clear. On the
other hand, the equalizer 232 which adjusts the low frequency component makes the sound
image of the low frequency component clear. As a result, the audio signal processing device 2
can reliably separate the low frequency component and the high frequency component. The
frequency characteristic adjusting unit 23 may at least adjust the low frequency component of
the audio signal received by the audio signal receiving unit 21. That is, by adjusting the low
frequency component by the frequency characteristic adjusting unit 23, it is possible to clarify
the sound image of the low frequency component and to divide it into an audio signal containing
no high frequency noise and an audio signal containing high frequency noise.
[0022]
The filter 24 includes a high pass filter (HPF) 241 and a low pass filter (LPF) 242. The high pass
filter 241 extracts the high frequency component of 2 kHz or more of the audio signal including
the high frequency component adjusted by the equalizer 231. On the other hand, the low pass
filter 242 extracts a low frequency component of 800 Hz or less of the audio signal including the
low frequency component adjusted by the equalizer 232. Therefore, the audio signal processing
apparatus 2 according to the first embodiment of the present invention can reliably divide the
low frequency component and the high frequency component by including the high pass filter
241 and the low pass filter 242. The filter 24 may extract at least the low frequency component
of the audio signal. That is, by the filter 24 extracting the low frequency component of the audio
signal, it is possible to divide it into an audio signal containing no high frequency noise and an
audio signal containing high frequency noise.
[0023]
The delay unit 25 delays the output from the speaker 4 more than the low frequency component
of 800 Hz or less extracted by the low pass filter 242 for the high frequency component of 2 kHz
or more extracted by the high pass filter 241. As a result, the audio output device 1 according to
the first embodiment of the present invention causes the low frequency component of the audio
signal not including the high frequency noise to reach the user's ear first and the audio signal
high frequency component including the high frequency noise thereafter It is possible to reach
The delay time by the delay unit 25 is determined by the distance between the user and the
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speaker 4 and is set between 5 ms and 20 ms at which the hearth effect is obtained. In the first
embodiment, the delay time by the delay unit 25 is set to 8 ms.
[0024]
The amplifier (AMP) 31 amplifies an audio signal sent from the high pass filter 241 via the delay
unit 25. The amplifier (AMP) 32 amplifies the audio signal sent from the low pass filter 242. The
amplifiers 31 and 32 of the audio output device 1 according to the first embodiment of the
present invention may be installed in the audio signal processing device 2 or may be an amplifier
provided in an on-vehicle audio device.
[0025]
The speaker 4 has a high frequency speaker 41 and a low frequency speaker 42. The high
frequency speaker 41 outputs the high frequency component of the audio signal amplified by the
amplifier 31 via the delay unit 25. On the other hand, the low band speaker 42 outputs the low
frequency component of the audio signal amplified by the amplifier 32. The audio signal output
from the high frequency speaker 41 is output by the delay unit 25 later than the audio signal
output from the low frequency speaker 42. Therefore, the voice signal output from the low
frequency speaker 42 reaches the user's ear earlier than the voice signal output from the high
frequency speaker 41. The audio signal output from the low-range speaker 42 is preferentially
sensed over the audio signal output from the V. 41. That is, since an audio signal containing no
high frequency noise is preferentially detected over an audio signal containing high frequency
noise, the noise on hearing is reduced without lowering the band of the high frequency
component, and the sound output from the speaker 4 It is possible to provide the audio output
device 1 and the audio signal processing device 2 capable of preventing the deterioration of the
sound quality.
[0026]
There are a plurality of functional block diagrams of the audio output device 1 according to the
first embodiment of the present invention other than that shown in FIG. FIG. 2 is a functional
block diagram in which the audio signal processing device 2 in the audio output device 1
according to the first embodiment of the present invention does not include the filter 24 but
includes the frequency characteristic adjusting unit 23. FIG. 3 is a functional block diagram in
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9
which the audio signal processing device 2 in the audio output device 1 according to the first
embodiment of the present invention does not include the frequency characteristic adjusting unit
23 but includes the filter 24.
[0027]
The audio signal processing device 2 of the audio output device 1 in the first embodiment of the
present invention, as shown in FIG. 2, transmits the audio signal from the equalizer 231 of the
frequency characteristic adjustment unit 23 to the delay unit 25 without passing through the
high pass filter 241. The voice signal may be transmitted from the equalizer 232 of the
frequency characteristic adjustment unit 23 to the amplifier 32 without passing through the low
pass filter 242. This is because the equalizer 231 adjusts the high frequency component, the
sound image of the high frequency component is clarified, the equalizer 231 adjusts the low
frequency component, and the sound image of the low frequency component is clarified, so that
the high frequency component and the low frequency component are It is because it is possible
to divide.
[0028]
Furthermore, as shown in FIG. 3, the audio signal processing device 2 of the audio output device
1 according to the first embodiment of the present invention adjusts the frequency
characteristics of the audio signal received by the audio signal receiver 21 from the audio signal
receiver 21. The signal may be transmitted to the high pass filter 241 of the filter 24 without
passing through the equalizer 231 of the unit 23, and may be sent to the low pass filter 242 of
the filter 24 without passing through the equalizer 232 of the frequency characteristic adjusting
unit 23 from the audio signal receiving unit 21. . This is because the high pass filter 241 extracts
high frequency components of an audio signal of 2 kHz or more, and the low pass filter 242
separates high frequency components and low frequency components by extracting a low
frequency component of an audio signal of 800 Hz or less. Is possible.
[0029]
The audio signal processing apparatus 2 according to the first embodiment of the present
invention can be surely divided into the high frequency component and the low frequency
component of the audio signal when both the frequency characteristic adjusting unit 23 and the
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filter 24 are provided. . As a result, the audio output device 1 can further reduce noise on the
user's sense of hearing by outputting high frequency components including high frequency noise
from the speaker 4 later than low frequency components not including high frequency noise. It
is.
[0030]
FIG. 4 is a control flowchart of the audio output device 1 according to the first embodiment. The
audio output device 1 will be specifically described below with reference to the functional block
diagram shown in FIG.
[0031]
In step S01, the audio signal receiving unit 21 receives the audio signal of the radio received by
the antenna 5. The audio signal is a signal having a wide range of frequencies from low
frequency components to high frequency components including high frequency noise. When the
reception of the audio signal is completed, the process proceeds to step S02.
[0032]
In step S 02, the equalizer 231 of the frequency characteristic adjusting unit 23 adjusts the
frequency characteristic of the high frequency component of the audio signal received by the
audio signal receiving unit 21, and the equalizer 232 of the frequency characteristic adjusting
unit 23 receives it by the audio signal receiving unit 21. Adjust the frequency characteristics of
the low frequency component of the audio signal. By adjusting the frequency characteristic of the
audio signal by the frequency characteristic adjusting unit 23, it is possible to reliably separate
the high frequency component and the low frequency component. When the adjustment of the
frequency characteristics of the audio signal is completed, the process proceeds to step S03.
[0033]
In step S03, the hyper filter 241 of the filter 24 extracts the high frequency component of the
audio signal, and the low pass filter 242 of the filter 24 extracts the low frequency component of
09-05-2019
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the audio signal. By including the high pass filter 241 and the low pass filter 242 in the filter 24
of the audio output device 1 according to the first embodiment of the present invention, it is
possible to reliably separate the high frequency component and the low frequency component.
When the extraction of the high frequency component and the low frequency component is
completed, the process proceeds to step S04 and step S05.
[0034]
In step S 04, the low frequency component of the audio signal is amplified by the amplifier 32
and output from the low frequency speaker 42. The sound output from the low-range speaker 42
reaches the user's ear earlier than the sound output from the high-range speaker 41 1.
[0035]
In step S05, the delay unit 25 delays the output from the speaker 4 more than the low frequency
component of 800 Hz or less extracted by the low pass filter 242 for the high frequency
component of 2 kHz or more extracted by the high pass filter 241. When the output of the high
frequency component is delayed compared to the output of the low frequency component, the
process proceeds to step S06.
[0036]
In step S06, the amplifier 41 amplifies the high frequency component of the audio signal whose
output from the speaker 4 is delayed by the delay unit 25 than the low frequency component of
the audio signal, and outputs the amplified signal from the high frequency speaker 41. The sound
output from the high frequency speaker 41 reaches the user's ear later than the sound output
from the low frequency speaker 42. Therefore, the audio output device 1 according to the first
embodiment of the present invention lowers the band of the high frequency component in order
to preferentially sense the audio signal not containing high frequency noise over the audio signal
containing high frequency noise by the Hearth effect. It is possible to reduce the noise on hearing
and prevent the deterioration of the sound quality of the sound output from the speaker 4.
[0037]
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12
The audio signal processing apparatus 2 according to the second embodiment of the present
invention performs the same operation as the audio output apparatus 1 according to the first
embodiment, even if it is a single channel such as an integrated unit by branching and joining
audio signals internally. It is possible to obtain an effect. FIG. 5 is a functional block diagram in
which the audio signal processing device 2 in the audio output device 1 according to the second
embodiment of the present invention includes a frequency characteristic adjusting unit 23 and a
filter 24. Hereinafter, the audio output device 1 according to the second embodiment of the
present invention will be described focusing on differences from the first embodiment.
[0038]
The audio signal processing apparatus 2 according to the second embodiment of the present
invention includes an audio signal receiving unit 21, a frequency characteristic adjusting unit 23,
a filter 24, a delay unit 25, and an amplifier 3. Further, the frequency characteristic adjustment
unit 23 includes equalizers 231 and 232, and the filter 24 includes a high pass filter 241 and a
low pass filter 242. Since each configuration is the same as that of the first embodiment, the
description of the configuration is omitted.
[0039]
As shown in FIG. 5, the audio signal received by the audio signal receiving unit 21 is transmitted
to an equalizer 231 for adjusting high frequency components and an equalizer 232 for adjusting
low frequency components. The audio signal transmitted to the equalizer 231 for adjusting the
high frequency component has a sound image of the high frequency component clarified and is
transmitted to the high pass filter 241. The high pass filter 241 extracts a high frequency
component of 2 kHz or more from the high frequency component whose sound image has been
clarified by the equalizer 231. Next, the audio signal whose high frequency component has been
extracted by the high pass filter 241 is transmitted to the delay unit 25. Then, the audio signal
transmitted to the delay unit 25 is transmitted to the amplifier 3.
[0040]
On the other hand, the sound signal of the low frequency component of the sound signal
transmitted from the sound signal receiving unit 21 to the equalizer 232 for adjusting the low
09-05-2019
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frequency component of the sound signal is clarified, and is transmitted to the low pass filter
242. The low pass filter 242 extracts low frequency components of 800 Hz or less from the
audio signal including the low frequency components of the audio signal adjusted by the
equalizer 232. Then, the audio signal whose low frequency component has been extracted by the
low pass filter 242 is transmitted to the amplifier 3.
[0041]
As described above, the audio signal processing apparatus 2 according to the first embodiment of
the present invention extracts the high frequency component by the high pass filter 241, and the
audio signal obtained by extracting the audio signal through the delay unit 25 and the low
frequency component by the low pass filter 242 And the same amplifier 3 can amplify the audio
signal. Therefore, the audio signal processing apparatus 2 according to the second embodiment
of the present invention can construct a single channel like an integrated device by branching
and joining audio signals internally.
[0042]
Further, the audio signal amplified by the amplifier 3 is divided into an audio signal transmitted
to the high frequency speaker 41 through the capacitor 6 and an audio signal transmitted to the
low frequency speaker 42 through the coil 7. . By transmitting to the high frequency speaker 41
via the capacitor 6, the high frequency speaker 41 is prevented from being damaged by the low
frequency component of the audio signal being transmitted to the high frequency speaker 41,
and the high frequency speaker 41 It is possible to reliably output the high frequency component
of the audio signal. In addition, when transmitting to the low-range speaker 42 via the coil 7, the
low-range component of the audio signal can be reliably output from the low-range speaker 42
by removing the high-frequency component from the coil 7 .
[0043]
There are a plurality of functional block diagrams of the audio output device 1 in the second
embodiment of the present invention other than that shown in FIG. FIG. 6 is a functional block
diagram in which the audio signal processing device 2 in the audio output device 1 according to
the second embodiment of the present invention does not include the filter 24 but includes the
frequency characteristic adjusting unit 23. FIG. 7 is a functional block diagram in which the audio
09-05-2019
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signal processing device 2 in the audio output device 1 according to the second embodiment of
the present invention does not include the frequency characteristic adjusting unit 23 but includes
the filter 24.
[0044]
The audio signal processing device 2 of the audio output device 1 according to the second
embodiment of the present invention is, as shown in FIG. 6, an audio from the equalizer 231 of
the frequency characteristic adjustment unit 23 via the delay unit 25 without passing through
the high pass filter 241. The signal and the audio signal from the equalizer 232 of the frequency
characteristic adjustment unit 23 may be merged without passing through the low pass filter
242. This is because the equalizer 231 adjusts the high frequency component, the sound image
of the high frequency component is clarified, the equalizer 231 adjusts the low frequency
component, and the sound image of the low frequency component is clarified, so that the high
frequency component and the low frequency component are It is because it is possible to divide.
[0045]
Furthermore, as shown in FIG. 7, the audio signal processing device 2 of the audio output device
1 according to the second embodiment of the present invention passes the audio signal received
by the audio signal receiving unit 21 through the equalizer 231 of the frequency characteristic
adjusting unit 23. Instead, the audio signal through the high pass filter 241 of the filter 24 may
be merged with the audio signal through the low pass filter 242 of the filter 24 without passing
through the equalizer 232 of the frequency characteristic adjustment unit 23. This is because the
high pass filter 241 extracts high frequency components of an audio signal of 2 kHz or more, and
the low pass filter 242 separates high frequency components and low frequency components by
extracting a low frequency component of an audio signal of 800 Hz or less. Is possible.
[0046]
The audio signal processing apparatus 2 according to the second embodiment of the present
invention can be surely divided into the high frequency component and the low frequency
component of the audio signal when both the frequency characteristic adjusting unit 23 and the
filter 24 are provided. . As a result, the audio output device 2 can further reduce noise on the
user's sense of hearing by outputting high frequency components including high frequency noise
09-05-2019
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from the speaker 4 later than low frequency components not including high frequency noise. It
is. Further, the control flow in the audio output device 1 of the second embodiment of the
present invention is the same as that in FIG. 2 which is a control flow diagram in the audio output
device 1 of the first embodiment of the present invention. .
[0047]
As described above, the audio output device 1 according to the second embodiment of the
present invention processes the audio signal from the radio by the audio signal processing device
2 which is a single channel such as an integrated device and outputs it from the low frequency
speaker 42 Audio signal can reach the user's ear earlier than the audio signal output from the
high frequency speaker 41. As a result, the user can sense the audio signal output from the lowrange speaker 42 more preferentially than the audio signal output from the high-range speaker
41 by the Hearth effect. Therefore, the audio output device 1 according to the second
embodiment of the present invention allows the user to detect the audio signal containing no
high frequency noise more preferentially than the audio signal containing high frequency noise.
It is possible to reduce the noise on hearing and to prevent the deterioration of the sound quality
of the sound output from the speaker 4.
[0048]
It is a functional block diagram in which the speech signal processing device in the speech output
device of Example 1 of the present invention was provided with the frequency characteristic
adjustment part and the filter. It is a functional block diagram in which the audio signal
processing device in the audio output device of Example 1 of the present invention does not have
a filter, but is provided with a frequency characteristic adjustment part. The audio signal
processing apparatus in the audio | voice output apparatus of Example 1 of this invention is a
functional block diagram provided with the filter, without providing a frequency characteristic
adjustment part. It is a control flowchart of the audio | voice output device of Example 1 of this
invention. The audio signal processing apparatus in the audio | voice output device of Example 2
of this invention is a functional block diagram provided with the frequency characteristic
adjustment part and the filter. The audio signal processing apparatus in the audio | voice output
apparatus of Example 2 of this invention is a functional block diagram provided with the
frequency characteristic adjustment part, without providing a filter. The audio | voice signal
processing apparatus in the audio | voice output apparatus of Example 2 of this invention is a
functional block diagram provided with the filter, without providing a frequency-characteristic
adjustment part.
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Explanation of sign
[0049]
DESCRIPTION OF SYMBOLS 1 ... audio | voice output apparatus 2 ... audio | voice signal
processing apparatus 21 ... audio | voice signal receiving part 23 ... frequency characteristic
adjustment part 231, 232 ... equalizer 24 ... filter 241 ... high pass filter 242 ... pass filter 25 ...
delay units 31 and 32 ... amplifier 4 ... speaker 41 ... speaker 42 ... for high frequency woofer 5 ...
antenna 6 ... capacitor 7 ···coil
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