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JP2002247685

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DESCRIPTION JP2002247685
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
on-vehicle audio apparatus, and in particular, it is possible to output from a front speaker an
interrupting voice such as a guidance voice of a navigation device or a telephone voice. Vehicle
audio device that can be played back as
[0002]
[0002] A plurality of audio sources such as a CD player, an MD player, and an FM / AM radio are
connected to a car audio apparatus, and a plurality of reproduction signals of a desired audio
source are installed in the car by user operation. Output from the front speakers and multiple
rear speakers. In addition, it is possible to connect a navigation device, a car telephone or the like
to such an on-vehicle audio device, and share the guidance voice of the navigation device or the
telephone voice with the speaker of the audio device and output it. For example, when outputting
an interrupting voice such as a guidance voice of a navigation device while reproducing an audio
source, the sound output from the front speaker is switched to the interrupting voice instead of
the reproduction signal of the audio source.
[0003]
In addition, when the playback sound of the audio source is output from the multiple front
speakers and the multiple rear speakers attached to the front and back of the car to increase the
sense of reality of the audio reproduction sound in the car, the equalizer's favorite frequency
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characteristics It is possible to reproduce the sound field of your choice.
[0004]
In order to increase the sense of reality of the reproduction sound of the audio source in the
vehicle, it is desirable to emphasize and output the low range of the reproduction sound output
from the front.
That is, by shifting the low-frequency sound of the reproduced sound of the audio source to the
front side, it is possible to reproduce the audio source with a natural feeling. Conventionally, in
order to shift the bass range of the audio reproduction sound output from the front to the front
side, the audio apparatus is provided with equalizers for the front signal and for the rear signal,
respectively, and the respective equalizers are adjusted to the frequency characteristics desired
by the user. In addition to setting, by boosting and outputting a bass signal by the front signal
equalizer, the bass range of the audio source to be reproduced in the car can be heard naturally
from the front.
[0005]
In addition, when outputting an interrupting voice such as a guidance voice of a navigation
device or a telephone voice, prepare an equalizer of a frequency characteristic that emphasizes a
mid-range sound in which a voice (human voice) stands out and prepare this equalizer. The
interruption voice is output from the speaker via the speaker.
[0006]
That is, when the equalizer for the front signal of the audio reproduction sound, the equalizer for
the rear signal of the audio reproduction sound, and the equalizer for the interrupt sound are
provided, and the low-frequency sound of the audio reproduction sound is shifted forward. The
setting of the frequency characteristics of the front signal equalizer is set by raising the low
range from the setting of the rear signal equalizer, and the audio signal is separately set and
output separately for the front and the rear. The audio reproduction sound is output from the
speaker, and the interruption voice such as the guidance voice of the navigation device and the
telephone voice is output from the front speaker as the frequency characteristic of the voice with
the interruption voice equalizer.
[0007]
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FIG. 4 is a diagram showing the configuration of a conventional on-vehicle audio apparatus.
In the figure, reference numeral 1 denotes a plurality of audio sources connected to the invehicle audio apparatus, to which a radio unit 1a, a CD unit 1b, an MD unit 1c and the like are
connected.
2a is a navigation device and 2b is a telephone. 3a is a source selector for selecting a desired
audio source from a plurality of audio sources, 3b is a source selector for switching the guidance
voice and telephone voice input of the navigation device, 4a, 4b and 4c are a rear equalizer, a
front equalizer and an interrupt, respectively. A voice equalizer, 5 is an output selector, 6a and
6b are amplifiers, and 7a and 7b are speakers. Reference numeral 8 is a control unit for
controlling the entire apparatus, 9 is an operation unit for selecting an audio source to be
reproduced and a front shift instruction operation for low tone range, 10 is a display unit, 11 is a
rear equalizer 4a, front equalizer 4b, It is an equalizer characteristic memory for storing
frequency characteristic data of the interrupt sound equalizer 4c.
[0008]
Audio reproduction signals of the radio unit 1a, the CD unit 1b, and the MD unit 1c are
connected to the source selector 3a, and a desired audio source is selected under the control of
the control unit 8. The voice signals of the navigation device 2a and the car telephone 2b are
connected to the source selector 3b, and the interrupt voice is selected under the control of the
control unit 8 when the guidance voice is output or when the telephone is used.
[0009]
The audio apparatus is provided with three independent equalizers: a rear equalizer 4a, a front
equalizer 4b, and an interrupt sound equalizer 4c. The output of the front equalizer 4a and the
interrupt audio equalizer are switched by the output selector 5, and when the interrupt audio is
output, the output is switched to the interrupt audio equalizer side.
[0010]
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The audio reproduction signal selected by the source selector 3a is input to the rear equalizer 4a
and the front equalizer 4b, and processing of the frequency characteristics set by the respective
equalizers is performed to perform audio from the rear speaker 7a and the front speaker 7b,
respectively. The reproduction signal is output. When an instruction to shift the low range of the
audio reproduction sound forward is given, the audio reproduction is performed by setting the
low range of the front equalizer 4b to a frequency characteristic that is enhanced compared to
the low range of the rear equalizer 4a. The low range of the sound is made to be able to be heard
from the front. During normal audio reproduction, the frequency characteristics of the front
equalizer 4b and the rear equalizer 4a are the same. Then, when the guidance voice or telephone
voice of the navigation device is output, a signal controlled to a frequency characteristic that
makes the voice stand out by the interrupt voice equalizer 4c is selected by the output selector 5
and replaced with the audio playback signal from the front speaker 7b. The guidance voice and
the telephone voice are output.
[0011]
Here, when performing normal audio reproduction, the control unit 8 switches the source
selector 3a to the audio source (for example, CD) selected by the user, and switches the output
selector 5 to the front equalizer 4b side. At this time, the front equalizer 4b and the rear
equalizer 4a are set to the frequency characteristics preferred by the user, and the reproduction
sound of the audio source (CD) is output from the rear speaker 7a and the front speaker 7b.
[0012]
When shifting the bass range of the reproduction sound of the audio source forward, the control
unit 8 sets the characteristic of the front equalizer 4b to the bass enhancement characteristic and
enhances the bass range of the audio reproduction sound input from the source selector 3a. By
outputting from the front speakers, the low frequency range of the audio playback sound can be
heard from the front in the car.
[0013]
In addition, at the time of using the guidance voice output of the navigation device or using the
telephone, the control unit 8 switches the output selector 5 to the interrupt voice equalizer side,
and the source selector 3b is included in the navigation device 2a and the telephone 2b. The
audio signal is switched to the unit for outputting the interrupt sound, and the interrupt sound is
output from the front speaker 7b so that the voice band is made to stand by the interrupt sound
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equalizer 4c.
[0014]
By the way, in the above-mentioned system for outputting the guidance voice of the navigation
device and the conversation voice of the telephone from the front speaker of the audio device,
the equalizer for the front, the equalizer for the rear, the guidance voice of the navigation device
And an equalizer for interrupting voice for telephone voice must be provided respectively, and
there is a problem that the cost becomes high.
[0015]
From the above, it is an object of the present invention to provide an on-vehicle audio device
capable of outputting an interrupting voice such as a guidance voice of a navigation device or a
telephone voice from a front speaker of the audio device. It is an object of the present invention
to provide an on-vehicle audio device capable of reproducing a low-pitched sound by shifting it
forward.
[0016]
SUMMARY OF THE INVENTION According to the present invention, the above-mentioned
problem is achieved by outputting reproduction signals of an audio source from a plurality of
front speakers and a plurality of rear speakers disposed at the front and back of a vehicle, and
from the front speakers In an on-vehicle audio apparatus that outputs an interrupting voice
instead of a reproduced signal of an audio source, a first equalizer unit that controls frequency
characteristics of the audio reproduced signal, and a second equalizer unit that controls
frequency characteristics of a signal output from a front speaker A second equalizer input signal
selection unit that selects a signal input to the second equalizer unit from the interrupt sound
and the output signal of the first equalizer unit; and a signal output from the front speaker of the
first equalizer unit Switching between the output signal and the output signal of the second
equalizer unit Speaker output switching unit, a bass front shift instructing unit for instructing the
front shift of the bass range of the audio source reproduction sound, and the front speaker
output when there is no interrupt audio output and there is no bass front shift instruction When
the switching unit is switched to the first equalizer unit side and there is no interrupt sound
output and there is the bass range front shift instruction, the second equalizer input signal
selection unit causes the output signal of the first equalizer unit to be the second equalizer And
the front speaker output switching unit is switched to the second equalizer unit side, and when
there is the interrupt audio output, the second equalizer input signal selection unit inputs the
interrupt audio signal to the second equalizer unit And the front speaker output switching unit It
is accomplished by the vehicle-mounted audio device and a control unit for switching to Isa side.
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[0017]
Further, according to the present invention, the control unit controls the frequency characteristic
setting of the second equalizer unit to an outstanding frequency characteristic at the time of
interrupting voice output according to the present invention, and when there is the bass range
front shift instruction. This is achieved by an on-vehicle audio device that controls the setting of
the second equalizer unit to a frequency characteristic that enhances the bass range.
[0018]
That is, when configured as described above, the audio reproduction signal whose frequency
characteristic is controlled by the first equalizer is output from the front speaker and the rear
speaker during normal audio reproduction, and the frequency characteristic control is performed
by the first equalizer during low-pass forward shift reproduction The low frequency sound is
enhanced by the second equalizer and the audio reproduction signal whose frequency
characteristic is controlled by the first equalizer is output from the front speaker while the audio
reproduction signal whose frequency characteristic is controlled by the first equalizer is output
from the front speaker. The audio reproduction signal whose frequency characteristic is
controlled can be outputted from the rear speaker, and the interruption voice controlled to the
frequency characteristic which makes the interruption audio signal stand out by the second
equalizer can be outputted from the front speaker.
[0019]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a view showing the main
configuration of a car audio system according to the present invention.
In the figure, 1 is a plurality of audio sources, 1a is a radio unit, 1b is a CD unit, and 1c is an MD
unit.
2a is a navigation device and 2b is a telephone unit.
3a and 3b are source selectors, 40a is a first equalizer, 40b is a second equalizer, 5 is an output
selector, 6a and 6b are amplifiers, 7a is a rear speaker, and 7b is a front speaker.
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Reference numeral 80 denotes a control unit for controlling the entire in-vehicle audio apparatus,
9 denotes an operation unit, 10 denotes a display unit, and 12 denotes an equalizer characteristic
memory for storing set frequency characteristic data of the equalizer.
[0020]
Audio reproduction signals from the radio unit 1a, the CD unit 1b, and the MD unit 1c are
connected to be input to the source selector 3a, and the source selector 3a is switched by the
control of the control unit 80.
[0021]
The guidance voice signal of the navigation device 2a and the interrupt voice signal of the
telephone 2b etc. are connected to be input to the source selector 3b, and the source selector 3b
is controlled by the control unit 80 to generate navigation voice when the guidance voice is
generated It switches to a voice signal, and switches to telephone voice when using the telephone
2b.
The output signal of the first equalizer 40a is connected to the source selector 3b, and the
control of the control unit 80 switches the source selector 3b to the side of the first equalizer
40a at the time of forward shift of the bass range of the reproduced sound of the audio source.
[0022]
The output signal of the source selector 3a is input to the first equalizer 40a, and the output
signal of the source selector 3b is input to the second equalizer 40b.
The output signal of the first equalizer 40 a is input to the amplifier 6 a and to the source
selector 3 b and the output selector 5.
The output signal of the second equalizer 40 b is input to the output selector 5.
[0023]
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The output selector 5 switches the signal to be output to the amplifier 6b from the input signal
from the first equalizer 40a and the input signal from the second equalizer 40b under the control
of the control unit 80.
The signal amplified by the amplifier 6a is output from the rear speaker 7a, and the signal
amplified by the amplifier 6b is output from the front speaker 7b.
[0024]
The frequency characteristic of the first equalizer 40a can be set under the control of the control
unit 80, and the audio signal is set to the user's favorite frequency characteristic.
[0025]
The second equalizer 40b is set to a frequency characteristic in which human voiced speech
stands out at the time of guidance voice output of the navigation device or in use of a telephone,
and is set to a frequency characteristic that enhances the bass region at the bass front shift
reproduction.
[0026]
The output selector 5 is switched to the side of the second equalizer 40b at the time of front shift
reproduction of the bass region and at the time of interruption guidance output by the use of the
telephone under the control of the control unit 80, and at the time of normal audio reproduction
Switch to the side.
[0027]
The equalizer characteristic memory 12 stores setting characteristic data of equalizers set in the
first equalizer 40a and the second equalizer 40b, and stores equalizer characteristic data
preferred by the user for the first equalizer 40a. For the second equalizer 40b, equalizer
characteristic data for interrupting voice and equalizer characteristic data for enhancing a bass
range are stored.
[0028]
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In the equalizer characteristic memory 12, only the data of the frequency characteristic curve for
enhancing the bass range as shown in FIG. 2A for the second equalizer 40 b and only the
midrange as shown in FIG. The data of the frequency characteristic curve that reduces the bass
range and the treble range is stored.
Further, data of the frequency characteristic curve as shown in FIG. 2C is stored for the first
equalizer 40a, and the frequency characteristic curve data for the first equalizer 40a can be
changed to the user's favorite frequency characteristic curve setting It has become.
[0029]
(A) Normal Reproduction When the user operates the operation unit 9 to select a desired audio
source to be reproduced, the control unit 80 switches the source selector 3a to the selected audio
source, and the reproduction operation of the selected audio source To the unit.
For example, when a CD is selected, the control unit 80 switches the source selector 3a to a CD
unit and instructs the CD unit 1b to perform a reproduction operation.
Further, at the time of normal reproduction without a bass range front shift instruction, the
control unit 80 switches the output selector 5 to the first equalizer 40 a side.
Thus, the CD reproduction audio signal output from the CD unit 1b is controlled to the user's
favorite frequency characteristic by the first equalizer 40a, amplified by the amplifier 6a and the
amplifier 6b, and then the sound from the rear speaker 7a and the front speaker 7b. Output as
[0030]
(B) Low-pitched front shift reproduction When the user instructs the low-pitched front shift of
the reproduced sound of the audio source by operating the operation unit 9, the control unit 80
switches the source selector 3b to the first equalizer 40a side and outputs it. The selector 5 is
switched to the second equalizer 40 b side. Further, the control unit 80 refers to the equalizer
characteristic memory 12 to set frequency characteristic data preferred by the user in the first
equalizer 40a and sets frequency characteristic data for enhancing the bass range in the second
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equalizer.
[0031]
In this way, the audio signal to be reproduced is controlled by the first equalizer 40a to the
equalizer characteristics preferred by the user and output from the rear speaker 7a, and the
audio signal made to the characteristics preferred by the user by the first equalizer 40a Can be
enhanced by the second equalizer 40b and output from the front speaker 7b. That is, the audio
sound is output from the rear speaker with the frequency characteristic of the first equalizer, and
the audio sound is output with the characteristic obtained by combining the frequency
characteristics of the first equalizer and the second equalizer from the front speaker. Can be a
sound field localized forward.
[0032]
The audio characteristic output from the front speaker 7b is a characteristic obtained by
combining the frequency characteristic of the first equalizer 40a and the frequency characteristic
of the second equalizer 40b as shown in FIG. 3, and the audio reproduction sound output from
the front speaker 7b is the rear speaker 7a. It is possible to make the bass range increased from
the audio reproduction sound output from the.
[0033]
(C) Interrupt voice output At the time of interrupt voice output such as guidance voice from the
navigation device 2a or telephone voice from the telephone 2b, the control unit 80 switches the
source selector 3b to a unit with interrupt (for example, navigation device) The output selector 5
is switched to the second equalizer 40 b side.
Further, the control unit 80 refers to the equalizer characteristic memory 12 to set the frequency
characteristic setting of the second equalizer 40b to the frequency characteristic for the interrupt
sound. For example, when the guidance voice output of the navigation device is transmitted from
the navigation device 2a to the control unit 80, the control unit 80 switches the source selector
3b to the navigation device 2a side and switches the output selector 5 to the second equalizer
40b side. 2 Set the frequency characteristic for interrupt voice to the equalizer 40b. When the
guidance voice from the navigation device 2a is finished, the settings of the source selector 3b,
the output selector 5 and the second equalizer 4b are returned to the state before the guidance
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voice output. In this way, the interruption sound controlled to the frequency characteristic that
emphasizes the audio band from the front speaker 7b while outputting the reproduction sound of
the audio source controlled to the user's favorite frequency characteristic from the rear speaker
7a (for example, the navigation device Guidance voice) can be output.
[0034]
As described above, the equalizer for the front output and the equalizer for the interrupt voice
are shared, and at the time of the interrupt voice output, the interrupt voice is output from the
front speaker by controlling to the frequency characteristic that makes the voice band stand out.
In the bass shift front shift reproduction, the control can be made to the frequency characteristic
in which the bass range of the audio reproduction sound is enhanced, and output from the front
speaker.
[0035]
Although the radio source, the CD, and the MD are described as the audio source in the above
embodiment, the audio source is not limited to this, and may be an audio source such as a
cassette tape or a digital broadcast receiver.
Further, although the interrupt voice is described as the guidance voice of the navigation device
and the conversation voice of the telephone, the interrupt voice is not limited to this and may be
another interrupt voice.
[0036]
Although the present invention has been described above by way of examples, the present
invention can be variously modified according to the subject matter of the present invention
described in the claims, and the present invention does not exclude this.
[0037]
As described above, according to the present invention, when the bass region of the reproduced
sound of the audio source is shifted forward and reproduced, the reproduced signal of the audio
source is controlled to the user's favorite frequency characteristic by the first equalizer. And the
low frequency of the output of the first equalizer is enhanced by the second equalizer and output
from the front speaker, and when the interrupt sound is output, the interrupt sound is input to
the second equalizer and the sound is output. Since the control is made to output from the front
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speaker by controlling the frequency characteristic to emphasize the band, it is possible to share
the front output equalizer for performing the low band front shift of the reproduced sound of the
audio source and the equalizer for interrupt voice Audio playback with a simple configuration,
which can reduce the cost of the audio device. The low frequency range it is possible to increase
the realism by playing to be heard from the front.
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