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JPH0847079

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DESCRIPTION JPH0847079
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio apparatus for freely changing and reproducing frequency characteristics of music or
speech signals, and more particularly to an apparatus capable of confirming or correcting the
actual frequency characteristics at a listening point. .
[0002]
2. Description of the Related Art Conventionally, when a certain music signal source is
reproduced or received using a tuner, the frequency characteristic curve operation knob of the
graphic equalizer is selected according to the source content (for example, classical music, song
or song, etc.) By adjusting, the music of the characteristic by the curve is reproduced, and you
can listen to the music of the atmosphere that suits the song.
[0003]
SUMMARY OF THE INVENTION However, in the conventional reproducing apparatus as
described above, at least the characteristics when output from the speaker are specified
characteristics, but in actual listening places, as desired Often the characteristics are not
obtained.
It occurs because there is an acoustic obstacle between the speaker and the ear, or the directivity
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of the speaker changes the characteristics of the reproduced sound. An object of the present
invention is to solve such conventional problems and to provide an acoustic device capable of
adjusting to a desired characteristic no matter what position the user listens to.
[0004]
In order to achieve the above object, according to the acoustic device of the present invention,
the configuration of claim 1 is characterized in that each band oscillator, equalizer unit, power
amplifier, speaker, remote control receiver, A sound having a band pass filter, a first peak value
detection circuit, a comparator for comparing the reception results of the first peak value
detection circuit and the remote control receiver, a display unit, a display control unit, and an
equalizer control unit And a remote control unit having a microphone, a second band pass filter,
a second peak value detection circuit, an equalizer setting unit, and a remote control transmitter.
The remote control unit is an equalizer setting unit that generates a signal for adjusting the
equalizer unit of the audio device body It has become the example was constructed. The equalizer
control unit temporarily stores the output of the comparator, and controls adjustment of a
specific frequency band of the equalizer unit according to the result.
[0005]
In the audio apparatus according to the present invention, in the configuration of the first aspect,
the output of each band oscillator is power-amplified through the equalizer section and the
sound output from the speaker is captured by the microphone of the remote control section. The
second band pass filter separates each frequency band and the second peak value detection
circuit detects a peak value for each frequency band and transmits it from the remote control
transmitter to the main unit, the remote control receiver of the main unit The output of the
equalizer section is peak detected for each frequency band of the equalizer section by the first
band pass filter and the first peak value detection circuit, and the reception result with the
remote control receiver is obtained. Are compared by the comparator, and the comparison result
is displayed on the display unit.
[0006]
According to the second aspect of the present invention, by further operating the equalizer
setting unit of the remote control unit, the signal for equalizer adjustment generated therefrom is
transmitted from the remote control transmitter to the main body, and the equalizer control unit
performs acoustics. It acts to manipulate the characteristics of the equalizer unit of the device
body.
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[0007]
According to the third aspect of the present invention, the data obtained from the comparator is
temporarily stored in the equalizer control portion in the configuration of the first aspect, and the
data of the characteristics of the equalizer portion of the acoustic device main body are initially
set to the target value. Act to converge.
[0008]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the acoustic
device of the present invention will be described in detail with reference to the drawings.
In FIG. 1 showing a perspective view of an embodiment of the acoustic device of the present
invention, the acoustic device main body 1 (hereinafter referred to as the main body) is operated
by the remote control unit 2.
The main unit 1 is provided with a level display unit 3 of each frequency, a speaker 4 and a
remote control receiver 5.
Further, the remote control unit 2 is provided with a characteristic operation button 6 for raising
and lowering the level of each frequency, a remote control transmitter 7, a microphone 8 for
receiving sound pressure from the speaker 4, and a frequency characteristic correction switch 9.
[0009]
In the block diagram of FIG. 2, for example, a reproduction signal of a compact disc (CD), an
input signal signal from a tuner, a reproduction signal of a tape, etc. Enter This input signal raises
and lowers the gain for each of the plurality of frequency bands divided in the graphic equalizer
11. The output of the graphic equalizer 11 is power-amplified by the power amplifier 12 and
reproduced by the speaker 4.
[0010]
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On the other hand, a part of the output of the graphic equalizer 11 is amplified by the amplifier
18, and the output of the amplifier 18 is transmitted through the first band pass filter 19 divided
into the same plural frequency bands as the graphic equalizer 11. The output of the first peak
value detection circuit 17 is input to one input terminal of the comparator 16 and the other input
terminal of the comparator 16 is supplied from the remote control receiver 5. A signal is input
and the two signal levels are compared. The comparison output of the comparator 16 is input to
the graphic equalizer control unit 13 that controls the graphic equalizer 11 via the switch 15.
The graphic equalizer control unit 13 supplies a control signal to the display control unit 14. The
display control unit 14 Control the display of the display unit 3. Further, each band oscillator 25
covering the entire band of the graphic equalizer 11 is provided at the input of the graphic
equalizer 11, which may individually transmit the center frequency of each band of the graphic
equalizer 11, and white noise As described above, it may be generated at an even level over each
band, and the oscillation is controlled by the remote control receiver 5 as described later.
[0011]
The output of the microphone amplifier 20 for amplifying the signal of the microphone 8 in the
remote control unit 2 is connected to the second band pass filter 21, and the output is connected
to the second peak value detection circuit 22. The peak value of the output of the second peak
value detection circuit 22 is converted to a digital signal by the AD converter 27 and applied to
the remote control transmitter 7 through the switch 9. The graphic equalizer setting unit 23 is
configured to set the graphic equalizer when the frequency characteristic correction switch 9 in
FIG. 1 is pressed and the characteristic operation button 6 is operated.
[0012]
As configured above, the operation of the first embodiment of the present invention will be
described. First, the characteristics of the graphic equalizer 11 are set by remote control. For
example, when playing a CD and listening to music with a desired sound quality, pressing the
frequency characteristic correction switch 9 of the remote control unit 2 shown in FIG. 1 and
operating the characteristic operation button 6 causes the remote shown in FIG. The control
signal of the graphic equalizer setting unit 23 of the control unit 2 is transmitted through the
fixed terminal b of the switch 9 and the remote control transmitter 7, and the signal is received
by the remote control receiver 5 of the main unit 1. It is input to the graphic equalizer controller
13 via the fixed terminal b. Then, the graphic equalizer 11 is controlled to have a characteristic
matched to the operation of the characteristic operation button 6, and a control signal is given to
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the display control unit 14, and the characteristic of the operated graphic equalizer 11 is
displayed on the display unit 3. The output signal of the graphic equalizer 11 is output from the
speaker 4 via the power amplifier 12.
[0013]
Next, the measurement of the equalizing characteristic at the listening position will be described.
When the switch 9 attached to the remote control unit 2 is pressed again, as shown in FIG. 2, the
movable contact contacts from the b side to the a side, and the remote control transmitter 7
generates and transmits a signal indicating that the characteristic is to be measured. Then, the
remote control receiver 5 on the main body 1 side stops the signal input from the input terminal
10 and causes each band oscillator 25 to oscillate. At the same time, the movable contact of the
switch 15 is switched from the fixed contact b to a.
[0014]
Then, when the microphone 8 receives the reproduced acoustic signal from the speaker 4, it is
amplified by the microphone amplifier 20, and the second band pass filter 21 has the same band
as the center frequency of each band of the graphic equalizer 11 (f0 To f4), the output of which
is detected by the second peak value detection circuit 22 for peak values. As a peak detection
method, for example, the signal is sampled with a clock of several tens of khz, which is twice or
more the highest frequency, and the signal is quantized, for example, to about 6 bits. The peak
value at that time is transmitted from the remote control transmitter 7.
[0015]
The transmitted data is input from the remote control receiver 5 to the comparator 16 and the
output of the graphic equalizer 11 is input to the first peak value detection circuit 17 through the
amplifier 18 and the first band pass filter 19. The peak value is detected as described on the
remote control unit 2 side, this data is input to the comparator 16, and the respective data are
compared by the comparator 16. In FIG. 3, D1 indicates the output data of the first peak
detection circuit, D2 indicates the data sent from the remote control unit 2, and D3 indicates the
output data of the comparator 16. At this time, for example, a value obtained by subtracting the
output of f2 from the respective outputs of the other f0, f1, f2, f3, f4 with respect to f2 (1 khz) is
sent to the graphic equalizer controller 13. This is to display the characteristics regardless of the
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position of the volume volume of the main body or the position received by the remote control
unit 2. The data sent to the graphic equalizer controller 13 is input to the display control unit 14
and displayed on the display unit 3 for a specific time by a display timer (not shown).
[0016]
Thus, it is necessary to understand how the frequency characteristics at the position of the
microphone 8 of the remote control unit 2 are affected by the surrounding conditions and
change with respect to the characteristics of the graphic equalizer 11 initially set. Then, based on
this result, it is possible to return to the initial state and change the setting. In this display
method, only the output data of the comparator 16 may be displayed, and if there is a display
space, both may be displayed side by side with the characteristic of the graphic equalizer 11 set
first, for example, by changing the display color. Even easier to understand. After the display
timer specific time has elapsed, the output data of the comparator 16 and the characteristics of
the graphic equalizer 11 initially set disappear and the oscillation of each band oscillator 25 is
also stopped, and instead the signal input from the input terminal 10 Is reproduced from the
speaker and the function of the remote control transmitter 7 is stopped. For this operation, both
the remote control transmitter 7 and the display control unit 14 may have timers, and only the
remote control transmitter 7 may have a timer so that the display is stopped if the transmission
is stopped. Good.
[0017]
Although the output of the second peak value detection circuit 22 is converted to a digital value
in the above, it may be transmitted by an analog value. In that case, the data in the main unit 1
may be matched to it.
[0018]
Next, a second embodiment of the present invention will be described. What is different from the
first embodiment in FIG. 2 is the configuration and operation of the graphic equalizer control unit
13. That is, the data supplied from the comparator 16 to the graphic equalizer control unit 13 is
temporarily stored in a memory in the graphic equalizer control unit 13 for each frequency band.
After that, the output from the comparator 16 is turned off by the transmission stop by the timer
from the remote control transmitter 7 or other means, and the characteristic of the graphic
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equalizer 11 is corrected in the direction that the difference becomes zero by the data in this
memory. To control. At the same time, a new characteristic temporarily or constantly corrected
may be displayed on the display unit 3 through the display control unit 14. According to the
second embodiment, once the equalizer characteristics are determined, the listening position is
moved, or even when the condition of an obstacle in the room changes, the desired
characteristics can be easily brought close to the originally determined characteristics. Also, it is
effective when the initial determination of the equalizer characteristics is not remote control but
direct manipulation of the main unit.
[0019]
As described above, according to the sound device of the present invention, the level of each
frequency of the output of each band oscillator of the sound device body is received by the
microphone attached to the remote control unit through the speaker. The level of each frequency
of the oscillator output is sent back to the main body by the remote control transmitter,
compared with the graphic equalizer characteristics and comparator, and the result is displayed,
or the result is that the graphic equalizer has a desired value. The difference is to be corrected.
[0020]
In this way, a change in the listening position or a change in the acoustic environment in the
room is displayed or corrected so that the desired sound reproduction characteristic can be
obtained from the speaker. It is possible to listen to the desired acoustic characteristics no matter
where the sound device is placed or at any position.
[0021]
Brief description of the drawings
[0022]
1 is an external perspective view of an acoustic device according to an embodiment of the
present invention.
[0023]
2 is a block diagram showing the configuration of the same.
[0024]
Fig. 3 is a waveform chart showing an example of comparator output data as well
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[0025]
Explanation of sign
[0026]
DESCRIPTION OF SYMBOLS 1 audio apparatus main body 2 remote control unit 3 display unit 4
speaker 5 remote control receiver 7 remote control transmitter 8 microphone 9 frequency
characteristic correction switch 11 graphic equalizer (equalizer unit) 12 power amplifier (power
amplifier) 13 graphic equalizer control unit ( Equalizer control section) 14 display control section
15 switch 16 comparator 17 first peak value detection circuit 19 first band pass filter 21 second
band pass filter 22 second peak value detection circuit 23 graphic equalizer setting section
(equalizer Setting section) 24 AD converter 25 each band oscillator
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