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JPH10327499

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH10327499
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
sound quality switching circuit for changing the sound quality according to small-scale and steep
characteristics in portable loudspeakers, wireless microphones, telephones and the like, and an
apparatus using the same.
[0002]
2. Description of the Related Art FIG. 6 is a block diagram showing the construction of a
conventional portable loudspeaker disclosed in Japanese Utility Model Application Publication
No. 58-71300. In the figure, 1 is a microphone, 2 is a changeover switch, 3 is a low pass filter, 4
is a high pass filter, 5 is an amplifier, 6 is a speaker, and 7 is a volume control volume.
[0003]
Next, the operation will be described. The sound that has entered the microphone 1 is selected by
the sound quality changeover switch 2 according to the purpose, and the output of the speaker 6
is obtained through the volume 7 and the amplifier 5. The sound quality switching switch 2
obtains the same sound quality as that of the conventional electric megaphone at the contact 1a.
When placed at the contact point 2a, the low-pass filter 3 is connected to the amplifier, which is
suitable for transmission to a distantly dispersed partner. When placed at the contact point 3a,
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the high pass filter 4 is connected to the amplifier 5 so that it is suitable for transmission to a
distantly concentrated partner. When the switch 2 is inserted into the contacts 2a and 3a, the
audio output of the speaker 6 becomes lower than when the switch 2 is connected to the contact
1a. Therefore, using the volume 7 linked to the switch 2, the audio output drop of the speaker 6
is prevented.
[0004]
The sound quality switching circuit of the prior art is configured as described above, and a
plurality of filters having predetermined characteristics are prepared, and one of the plurality of
filters is selected according to the purpose. Therefore, assuming that n number of characteristics
are required as predetermined characteristics, n number of filters are required, and there is a
problem that the circuit scale increases. Another problem is that it is difficult to set individual
filters when trying to realize a filter with a steep frequency characteristic.
[0005]
The present invention has been made to solve the above-mentioned problems, and it is an object
of the present invention to obtain a sound quality switching circuit which can obtain sharp
characteristics with a small circuit scale.
[0006]
A sound quality switching circuit according to the present invention comprises a plurality of
filters each having a predetermined band and a plurality of filters arranged in series so that two
or more of the plurality of filters are connected in series. The switch of (1) is made to pass the
audio signal of the input through a plurality of filters selected by these switches to obtain a
desired band output.
[0007]
A telephone equipped with a sound quality switching circuit according to the present invention
comprises a plurality of filters each having a predetermined band, and a plurality of switches
arranged such that the plurality of filters are connected in series, A sound quality switching
circuit is provided which passes a plurality of filters selected by these switches to obtain a
desired band output, and this sound quality switching circuit is used for the audio output portion
of the received signal.
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[0008]
Furthermore, a memory for storing the setting of the voice band and a combination of a plurality
of serially connected filters is provided, and when the voice band is specified, the corresponding
filter is selected.
[0009]
DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment
Hereinafter, an embodiment of the present invention will be described with reference to the
drawings.
FIG. 1 is a block diagram of a portable loudspeaker using the sound quality switching circuit of
the present invention.
In FIG. 1, 1 is a microphone, 31 to 3 n are voice band limiting filters, 21 to 2 m are switches for
switching two or more voice band limiting filters 31 to 3 n in series, 5 is an amplifier, 6 is a
speaker .
FIG. 2 is a diagram showing individual characteristics of the voice band limiting filter of FIG. 1
and an example of combination characteristics.
[0010]
The input / output operation in the sound quality switching circuit of the above configuration
will be described. The audio signal input from the microphone 1 switches one or more of the
filters 31 to 3 n having different frequency characteristics in order to switch the sound quality of
the audio signal according to the surrounding environment and the use application. Select and
realize by setting using. Here, when the voice band limiting filters 31, 32, and 33 have the
characteristics of F1, F2, and F3 shown in FIGS. 2A, 2B, and 2C, respectively, the voice
changeover switches 22, 23, and 26 are closed. , 2m is switched to the lower side. In that case,
only the voice band limiting filters 31, 32, and 33 are connected in series, and the combination
characteristic becomes the band of F1 + F2 + F3 shown in FIG. 2D. Thus, steep characteristics can
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be obtained with small-scale elements. Further, although the case of the portable loudspeaker has
been described in the above embodiment, it may be a telephone including a wireless microphone,
a portable telephone or a cordless telephone, and the same effect can be obtained.
[0011]
Second Embodiment Although the case where the portable loudspeaker sound quality switching
circuit is applied has been described in the first embodiment, it is more effective when applied to
a portable telephone which is affected by the ambient environment of use. In this embodiment, a
case will be described in which the function of adjusting the frequency characteristic of the
microphone on the transmission side is provided in the mobile phone in accordance with the
voice quality of the user. This may be inserted into the speaker on the receiving side. FIG. 3 is a
block diagram of a portable telephone using the tone switching circuit of the present invention,
and FIG. 4 is a detailed block diagram showing the microphone of the broken line portion of the
configuration of FIG. In FIG. 3, 51 is a high frequency circuit unit that processes radio signals
transmitted and received by an antenna, 52 is a communication control logic circuit unit, 53 is a
modulation / demodulation circuit unit of transmission and reception signals, 54 is a read only
memory for program storage, 55 is a program. A read / write memory for storing parameters to
be used, 56 is a CPU, 57 is an audio processing unit for processing an audio signal input from a
micro signal, and converting a digital audio signal into an analog audio, 58 is an LCD display of
59 And a control circuit unit for controlling the ten keys and the like. Further, in FIG. 4, 41 is an
anti-aliasing filter, 42 is an A / D converter, and 43 is a codec unit. The other microphones 1, the
voice band limiting filters 31 to 33, connection path changeover switches 21 to 27 are the same
as the elements of the corresponding numbers in FIG.
[0012]
The change of the voice signal in the above-described mobile phone according to the changeover
switch will be described. In the connection state of the changeover switch shown in FIG. 4, the
voice band limited filters 31, 32, 33 are connected in series to the voice signal converted by the
microphone 1. Assuming that these three characteristics are F1, F2 and F3 shown in FIGS. 2 (a),
(b) and (c), the characteristic of FIG. 2 (d) which is F1 + F2 + F3 in this case is obtained.
[0013]
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In the above configuration, the case of series connection of F1 + F2 + F3 has been described, but
as shown in FIG. 5A, for example, bass emphasis 61, mid tone emphasis 62, treble emphasis 63,
mid bass as emphasis bands according to sound quality on the memory of ROM 54. The setting
table of the logic 72 of ON / OFF of the SW number 71 may be stored separately for the
emphasis 64 etc. and corresponding to the middle bass emphasis 64 in FIG. 5B. When the SW
setting table is stored for each emphasis band in this manner, the necessary band-limiting filter is
selected to reduce the burden on the talker only by the talker designating the emphasis band in
consideration of the surrounding environment. effective. In addition to the purpose of the
transmitter to select the sound quality in response to the surrounding environment, it can also be
used for the purpose of correcting the frequency characteristic deviation of the audio frequency
range due to, for example, the structure of the portable telephone.
[0014]
As described above, according to the present invention, since a plurality of voice band limiting
filters are connected in series, the effect of obtaining a rich or steep characteristic with a small
scale element is obtained. is there.
[0015]
In addition, since the serial connection type sound quality switching circuit is applied to the
mobile phone, there is an effect that good frequency characteristics can be obtained in a small
mounting space.
[0016]
Brief description of the drawings
[0017]
FIG. 1 is a block diagram of a portable loudspeaker according to Embodiment 1 of the present
invention.
[0018]
FIG. 2 is a diagram showing an example of characteristics of a voice band limit filter and an
example of combination characteristics in the first embodiment.
[0019]
FIG. 3 is a block diagram of a mobile phone in a second embodiment of the present invention.
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[0020]
FIG. 5 is a diagram of an audio input circuit centered on a sound quality switching circuit in a
second embodiment.
[0021]
FIG. 6 is a diagram showing an example of a highlight switch in the second embodiment and an
example of a corresponding changeover switch.
[0022]
FIG. 6 is a block diagram of a conventional portable loudspeaker.
[0023]
Explanation of sign
[0024]
1 microphone, 2 sound quality switch, 3 low pass filter, 4 high pass filter, 5 amplifier, 6 speakers,
7 volume, 21-2m path switch, 31-3n filter, 41 anti-aliasing filter, 42 A / D converter, 43 CODEC
unit, 51 high frequency circuit unit, 52 communication control circuit unit, 53 modulation /
demodulation circuit unit, 54 read only memory, 55 read / write memory, 56 CPU, 57 ADPCM
CODEC, 58 LCD / MMI control circuit , 59 numeric keys, 60 LCD, 70 memory (ROM).
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