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JP2003188666

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DESCRIPTION JP2003188666
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio apparatus mounted on a car.
[0002]
2. Description of the Related Art Heretofore, this type of audio apparatus displays volume control
means for adjusting the volume of music, and displays the total power of the music reproduced
so as to be the volume adjusted by this volume control. An analog level display means (such as an
analog meter) is provided, and the needle of the analog meter is shaken according to the change
of the total power.
[0003]
However, in such a conventional audio device, since the frequency characteristic of the analog
meter is flat and the total power of the reproduced music is displayed, for example, the input
level of the vocal When playing a large music, there is a problem that the movement of the hand
of the analog meter is not interlocked even if the low-range sound is output, being influenced by
the level of the vocal sound.
[0004]
The present invention has been made to solve such a problem, and provides an audio device
capable of interlocking the needle of an analog meter with the output level in a desired frequency
band.
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1
[0005]
The audio apparatus according to the present invention continuously displays the level of the
analog audio signal, and volume control means for adjusting the amount of increase or decrease
of the analog audio signal of each of the left and right channels according to the voltage value.
An analog level display means, and a frequency characteristic adjustment means for adjusting a
frequency characteristic of a desired band of the analog audio signal of each of the left and right
channels, provided between the volume adjustment means and the analog level display means
The display means is configured to display the analog audio signal level of the band adjusted by
the frequency characteristic adjustment means.
With this configuration, it is possible to attenuate the analog audio signal other than the desired
frequency band by the frequency characteristic adjusting means, so that the needle of the analog
meter is interlocked with the output level in the desired frequency band.
[0006]
Also, the audio apparatus of the present invention has a configuration provided with band
selection means for selecting a desired frequency band of the analog audio signal of each of the
left and right channels.
With this configuration, a user, a service person, and the like can select a desired frequency band,
and operability can be improved.
[0007]
Also, the audio apparatus of the present invention has a configuration provided with a control
unit that performs control to attenuate analog audio signals other than the frequency band
selected by the band selection means.
With this configuration, the control unit controls the selected frequency band to attenuate analog
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voice signals other than the above band, so that the user or service person can select the desired
frequency band and use the desired frequency band. The hands of the analog meter can be linked
to the output level, which improves the convenience.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings. As shown in FIG. 1, the audio apparatus
according to the first embodiment of the present invention comprises volume control means 11
for adjusting the increase / decrease amount (attenuation amount and amplification factor) of the
analog audio signal of each of the left and right channels according to voltage value. Between the
analog level display means 13 for continuously displaying the levels of the analog audio signals
of the left and right channels, the volume control means 11 and the analog level display means
13, and And frequency characteristic adjusting means 12 for adjusting the frequency
characteristic of the desired band.
[0009]
In FIG. 1, the volume control means 11 is composed of, for example, an electronic volume, and
the attenuation amount or amplification factor of the audio signal at the time of reproducing the
music is used as the electronic volume setting position without using a mechanical movable part.
Change and set. The frequency characteristic adjusting means 12 adjusts the frequency
characteristic of the audio signal when the digital audio signal is analog-converted by a D / A
converter (not shown) to reproduce music, and in the present embodiment, a desired frequency
band Control is performed to attenuate analog audio signals other than (for example, the high
range of vocals and the low range of drum performance). The analog level display means 13 is
composed of, for example, an analog meter circuit, and displays in such a manner that the needle
is dynamically shaken by the level change in the desired frequency band of the audio signal
according to the adjustment of the frequency characteristic adjustment means 12 is there. Note
that the volume control means 11 may be a volume configured of a variable resistor or the like.
[0010]
Here, FIG. 2 shows the configuration of the frequency characteristic adjusting means 12. In FIG.
2, the frequency characteristic adjusting unit 122 is formed of an equalizer having, for example,
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a predetermined center frequency and a variable range (here, four steps), inputs audio signals
from the left and right channels, and filters from the control unit 121 According to the selection
signal, a filter for attenuating an analog audio signal outside the frequency band is selected,
processed and adjusted. The control unit 121 is formed of, for example, a microcomputer
(hereinafter, also referred to as a microcomputer), receives the band selection signal from the
band selection unit 14 and sets it updatable, and switches 1 to 4 according to the band selection
signal. One of (SW1 to SW4) is selected to output a filter selection signal. FIG. 2 shows a state in
which the switch 1 is selected and the switch 1 is closed. The band selection means 14 is
provided with a selection button (not shown) for selecting any one of desired bands (here, four
bands corresponding to the four stages), and this selection button makes it possible to select one
of the four bands. When any one is selected, the selection information is output as a band
selection signal.
[0011]
Next, the operation of the audio apparatus according to the present embodiment will be
described with reference to FIG. When one of the four previously set bands is selected by the
operation of the band selection unit 14, the band selection signal is output from the band
selection unit 14 to the control unit 121 (step S101). Next, when the band selection signal is
input, the control unit 121 outputs a filter selection signal to the frequency characteristic
adjustment unit 122 according to the band selection signal (step S102). Next, when the filter
characteristic selection unit 122 receives the filter selection signal from the control unit 121, the
frequency characteristic adjustment unit 122 switches and sets a filter to attenuate an analog
audio signal other than the frequency band selected as described above, The frequency
characteristics are processed (steps S103 and S104).
[0012]
The details of the operation (step S102) of the control unit 121 are as shown in FIG. That is,
when the control unit 121 detects the band selection signal from the band selection unit 14 (step
S201), the control unit 121 determines which of the first to fourth bands this band selection
signal is (step S202). , S204 and S206), one of SW1 to SW4 is turned on according to the
judgment result, and the filter selection signal is output to the frequency characteristic
adjustment unit 122 (steps S203, S205, S207, S208).
[0013]
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As described above, in the audio apparatus according to the embodiment of the present
invention, the volume adjustment means 11 for adjusting the increase / decrease amount
(attenuation amount and amplification factor) of the analog audio signal of each of the left and
right channels according to the voltage value; Between the analog level display means 13 for
continuously displaying the level of the analog audio signal of each channel, and the volume
adjustment means 11 and the analog level display means 13, the frequency of the desired band
of the analog audio signal of each of the left and right channels Since the frequency
characteristic adjusting means 12 for adjusting the characteristic is provided, it is possible to
display so that the needle of the analog meter is dynamically shaken at a desired frequency
according to the preference of the user. For example, when playing a song in which the vocal
sound level is dominant, it is possible to dynamically express the swing of the needle for the low
frequency range sound.
[0014]
As described above, according to the present invention, the frequency characteristic of the
desired band of the analog audio signal of each of the left and right channels is set between the
volume control means such as the electronic volume and the analog level display means such as
the analog meter. By providing the frequency characteristic adjusting means for adjusting, it is
possible to provide an audio device having an excellent effect that the signal level of a desired
band can be displayed.
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