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JP2009260682

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Notice
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DESCRIPTION JP2009260682
The present invention provides an audio device which enables cost reduction and can realize
powerful audio output. SOLUTION: A bass boost unit 42 which relatively increases a bass range
amplitude by attenuating a treble range amplitude of an input audio signal, and interlocking with
an increase of a bass range amplitude by the bass boost unit 42. The audio apparatus 100
includes the first volume unit 43 that increases the amplitude of the entire band with respect to
the audio signal in which the amplitude of the bass range is increased. [Selected figure] Figure 2
Audio device
[0001]
The present invention relates to audio devices.
[0002]
Some commonly used audio devices have a Bass Boost function that enhances the volume of the
bass range.
According to the bass boost function, processing is performed such that the amplitude of the
bass range is increased and the amplitude of the treble range is attenuated among the input
audio signals. Thus, powerful voice output is possible in the low frequency range.
08-05-2019
1
[0003]
According to Patent Document 1, there is disclosed a circuit which can obtain a constant bass
boost characteristic by adjusting an amount of change in amplitude (gain) by the bass boost
function. Japanese Patent Application Laid-Open No. 11-41048
[0004]
However, it is difficult to incorporate the bass boost circuit according to Patent Document 1 into
an audio device and manufacture it at low cost, and the cost of the audio device can not be
reduced. On the other hand, a bass boost circuit realized by an inexpensive audio device can not
sufficiently boost the bass range and can not realize a powerful audio output.
[0005]
An object of the present invention is to provide an audio device that enables cost reduction and
can realize powerful audio output.
[0006]
According to the first aspect of the invention, there is provided a bass boost unit that relatively
increases the bass range amplitude by attenuating the treble range amplitude of the input audio
signal; and the bass range amplitude by the bass boost unit. An audio apparatus comprising: a
first volume unit that increases the amplitude of the entire band with respect to an audio signal
whose amplitude of the bass range is increased, in conjunction with the increase of the sound
volume.
[0007]
According to the invention of claim 2, according to the invention of claim 1, further comprising: a
second volume unit that increases the amplitude of the audio signal for each of one or more
output target speakers; An audio device is provided in which the volume unit increases the
amplitude of the entire band with respect to the audio signal in which the amplitude of the bass
region is increased in conjunction with the increase of the amplitude of the bass region by the
bass boost unit.
[0008]
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2
According to the invention as set forth in claim 3, according to the invention as set forth in claim
1 or 2, further comprising: input means for switching whether or not the amplitude of the bass
range is increased by the bass boost unit; The voice of which the amplitude of the bass range is
increased in conjunction with the switching when the volume unit and / or the second volume
unit is switched by the input unit to increase the amplitude of the bass range An audio device is
provided that increases the amplitude of the entire band for the signal.
[0009]
According to the invention as set forth in claim 4, in the invention as set forth in any one of
claims 1 to 3, a tone which individually increases the amplitude of the audio signal in each of a
bass range, a mid range and a high range. An audio apparatus is provided, wherein the tone unit
individually increases the amplitude in each of the regions with respect to the audio signal whose
amplitude is previously increased by the volume unit.
[0010]
According to the present invention, after the volume of the bass region is increased by the bass
boost function, the volume increase processing by the volume unit is performed in conjunction.
Therefore, it is possible to increase the volume of the bass region by the bass boost function
while maintaining the configuration of the conventional audio device.
That is, even with an inexpensive audio device, powerful audio output can be realized in the low
tone range.
[0011]
Hereinafter, the optimal configuration and operation of the audio device according to the present
embodiment will be described in detail with reference to the drawings.
First, the functional configuration of the audio device 100 will be described with reference to FIG.
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3
The audio apparatus 100 includes a CD mechanical unit 10, a tuner unit 20, an external I / F 30,
an audio IC unit 40, an amplifier unit 50, a speaker group 60, a key input unit 70, a display unit
80, and a microcomputer 90. .
[0012]
The CD mechanism unit 10 reads a digital sound source stored in a CD (Compact Disk) or the like
as an audio signal, and outputs the read analog audio signal to the audio IC unit 40.
The tuner unit 20 receives a broadcast signal, converts it into an analog audio signal, and outputs
the converted audio signal to the audio IC unit 40. The external I / F 30 inputs an analog audio
signal from an external device via a USB cable or the like, and outputs the input audio signal to
the audio IC unit 40.
[0013]
The audio IC unit 40 performs each adjustment such as volume adjustment and equalizer
adjustment on the analog audio signal based on the control signal output from the
microcomputer 90. Then, the audio IC unit 40 outputs an analog audio signal to the amplifier
unit 50. The processing of each unit constituting the audio IC unit 40 will be described later with
reference to FIG. The amplifier unit 50 receives an analog audio signal, amplifies the input audio
signal, and outputs the amplified audio signal to the speaker group 60. The speaker group 60
outputs an analog audio signal output from the amplifier unit 50 as a sound wave.
[0014]
The key input unit 70 outputs various instructions to the microcomputer 90. The various
instructions include, for example, an instruction to switch the bass boost function ON / OFF. The
display unit 80 displays the state of the audio device 100 based on the display signal output
from the microcomputer 90. The microcomputer 90 outputs a control signal to the audio IC unit
40 connected via a serial interface, and centrally controls each process in the audio IC unit 40.
08-05-2019
4
[0015]
The functional configuration of the audio IC unit 40 is shown in FIG. The audio IC unit 40
includes an input selector unit 41, a bass boost unit 42, a volume unit 43, a tone unit 44, a rear
volume unit 45, and a serial I / F controller 46.
[0016]
The input selector unit 41 selects one of a plurality of audio signals input from each unit and
outputs the selected audio signal to the bass boost unit 42. The bass boost unit 42 receives the
audio signal output from the input selector unit 41, and performs processing to increase the
amplitude of the bass region and attenuate the amplitude of the treble region with respect to the
input audio signal.
[0017]
FIG. 3 shows an example of an analog filter that the bass boost unit 42 uses to increase or
decrease the amplitude. The vertical axis represents amplitude (volume), and the horizontal axis
represents frequency band. The analog filter shown in FIG. 3 outputs an audio signal whose
amplitude is changed according to the frequency. The amount of change in amplitude varies
depending on predetermined settings (settings 1 to 3, OFF). The amount of change in settings 1
to 3 is large in the low frequency range and decreases as the frequency increases. And, after
passing the peak of falling, it has a characteristic that it slightly increases as the frequency goes
up. When the setting is OFF, it becomes flat (no change). The bass boost unit 42 passes the input
audio signal through an analog filter shown in FIG. 3 and outputs the audio signal having passed
through the analog filter to the volume unit 43.
[0018]
The volume unit 43 receives an audio signal output from the bass boost unit 42 and performs
processing to increase the amplitude of the input audio signal in the entire band. The tone unit
44 receives an audio signal output from the volume unit 43, and individually modulates the
amplitude of the center frequency in the bass range, middle range, and high range (Treble) of the
input audio signal. Perform processing to increase. The subsequent-stage volume unit 45
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5
receives the audio signal output from the tone unit 44, and performs processing to increase the
amplitude of the input audio signal for each speaker to be output. The serial I / F controller 46
inputs an audio signal output from the microcomputer 90, and outputs the input control signal to
the above-described units.
[0019]
Next, processing of each part of the audio IC unit 40 in the present embodiment will be described
with reference to FIGS. 4 and 5. The process performed by the volume unit 43 will be described
with reference to FIG. The volume unit 43 performs processing in conjunction with the operation
of the bass boost unit 42. Specifically, when the bass boost unit 42 receives a switch instruction
to turn on the bass boost function from the key input unit 70, the bass boost unit 42 increases
the bass range amplitude of the input audio signal in conjunction with the switch instruction. I
do. Here, the volume unit 43 increases the amplitude of the entire band so that the amplitude of
the high tone range becomes larger than the OFF value of FIG. 3. Since the amplitude of the
entire band is further increased by the volume unit 43, as a result, the amplitude of the bass
region is enhanced more than ever.
[0020]
The process performed in the latter-stage volume unit 45 will be described with reference to FIG.
The post-stage volume unit 45 performs processing in conjunction with the operation of the bass
boost unit 42 and the volume unit 43. Specifically, when the bass boost unit 42 and the volume
unit 43 receive a switching instruction to turn on the bass boost function from the key input unit
70, the amplitude of the bass range of the input audio signal in conjunction with the switching
instruction. And increase the amplitude of the entire band. The second-stage volume unit 45
further performs processing to increase the amplitude of the entire band in conjunction with the
operations of the bass boost unit 42 and the volume unit 43. Here, the subsequent-stage volume
unit 45 further increases the amplitude of the entire band with respect to the amplitude of the
entire band which is increased by the volume unit 43 so that the amplitude of the high range
becomes the amplitude larger than the OFF value of FIG. Since the amplitude of the entire band is
further increased by the post-stage volume unit 45, as a result, the amplitude of the bass region
is enhanced more than ever.
[0021]
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6
As described above, according to the present embodiment, when the bass boost unit 42 performs
the process of increasing the amplitude of the low tone range, the volume unit 43 automatically
performs the process of increasing the amplitude in the entire band. At this time, the volume unit
43 increases the amplitude more than conventional. Specifically, the amplitude of the high range
is further increased beyond the OFF value of FIG. As a result, the amplitude of the bass range is
enhanced. Therefore, a powerful audio output can be made possible while maintaining the
current audio device configuration.
[0022]
In addition, when the bass boost unit 42 or the volume unit 43 performs the process of
increasing the amplitude of the low tone range, the subsequent stage volume unit 45 may
automatically perform the process of increasing the amplitude. As a result, the amplitude of the
bass region is further enhanced. Therefore, a powerful audio output can be made possible while
maintaining the current audio device configuration.
[0023]
Further, the bass boost function can be switched ON / OFF by the key input unit 70, and when
the bass boost function is switched ON, the volume unit 43 or the subsequent stage is interlocked
with the increase in the bass range amplitude by the bass boost unit 42. The increase processing
of the amplitude by the volume unit 45 may be performed. In this case, the user can increase the
amplitude of the bass range and view the powerful audio output only by the operation of turning
on the bass boost function.
[0024]
Note that the enhancement effect of the audio signal in the present embodiment is not limited to
the above-described bass boost processing, and can also be used, for example, in the equalizer
adjustment processing. Hereinafter, as another embodiment, the case where the enhancement
effect of the audio signal is used for equalizer adjustment will be described.
[0025]
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7
The process performed by the volume unit 43 and the tone unit 44 will be described with
reference to FIG. Although the bass boost function is described as being switched off in order to
distinguish it from the enhancement effect described above, it may be on.
[0026]
The volume unit 43 performs processing for increasing the amplitude of the input audio signal in
advance in conjunction with the equalizer adjustment performed in the tone unit 44. The tone
unit 44 individually increases the amplitude of the audio signal of which the amplitude of the
entire band has been increased by the volume unit 43 in any or all of the low tone range, the mid
tone range, and the high tone range.
[0027]
As described above, according to another embodiment, the amplitude in the entire band is
increased in advance by the volume unit 43, and the tone unit 44 performs a process to further
increase the amplitude of each frequency band. As a result, the equalizer curve is enhanced.
Thus, the user can effectively perform the equalizer adjustment.
[0028]
It is a figure which shows the function structure of an audio apparatus. It is a figure which shows
the function structure of an audio IC part. It is an image figure of a digital filter. It is a figure
explaining the process performed in a volume part. It is a figure explaining the process
performed in a back ¦ latter stage volume part. It is a figure explaining the process performed in
a volume part and a tone part.
Explanation of sign
[0029]
DESCRIPTION OF SYMBOLS 100 audio apparatus 10 CD mechanism part 20 tuner part 30
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external I / F 40 audio IC part 50 amplifier part 60 speaker group 70 key input part 80 display
part 90 microcomputer 41 input selector part 42 bass boost part 43 volume part 44 tone part
45 Post-volume section
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