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JP2000253484

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DESCRIPTION JP2000253484
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker driving apparatus and an audio apparatus equipped with the same, and more particularly
to a speaker having at least one or more unique resonance frequencies, a signal level of a
frequency which becomes the unique resonance frequency. The present invention relates to a
speaker driving device capable of driving an acoustic signal with an attenuated electric acoustic
signal so that an acoustic output generated by the speaker is similar to the input electric acoustic
signal, and an acoustic apparatus equipped with the same.
[0002]
2. Description of the Related Art Conventionally, a loudspeaker usually has at least one or more
inherent mechanical resonance frequencies, and when the loudspeaker is driven by inputting an
electric acoustic signal, the loudspeaker resonates at the portion of the above-mentioned
resonance frequency. An acoustic output that is not similar to the input electrical acoustic signal
is generated, and the sound quality is degraded.
[0003]
Therefore, in the conventional speaker, damping paint is applied to the cone paper portion, the
speaker edge portion, the cap portion, etc. of the speaker, and the characteristic resonance
frequency of the single speaker unit is similar to the input electroacoustic signal. The resonance
phenomenon of the speaker is suppressed using a damping method such as suppressing the
generation of a non-speech sound output or shifting the inherent resonance frequency out of the
band of the electric sound signal for driving the speaker.
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[0004]
SUMMARY OF THE INVENTION The above-described conventional vibration damping method for
a speaker has the following problems.
1) It takes too much time and money for damping.
2) Vibration control not only suppresses the inherent resonance frequency but also greatly
affects other frequencies. 3) As a result of damping, the sound output is attenuated.
[0005]
The present invention has been made in view of such a point, and it is possible to damp the
inherent resonance frequency of the speaker so that other frequencies do not have a large
influence, and as a result of the damping, the acoustic output is attenuated. It is an object of the
present invention to provide a speaker driving device without a speaker and an audio device
equipped with the same.
[0006]
[Means for Solving the Problems] In order to achieve the above-mentioned problems, in the
speaker driving device of the present invention and the acoustic apparatus equipped with the
same, an electric acoustic signal is inputted to make the sound field of the electric acoustic signal
into space. A speaker driving device for driving a speaker to be generated, characterized in that a
characteristic resonance frequency attenuation means is provided for attenuating a signal level at
a frequency which is at least one characteristic resonance frequency of the speaker from the
electric sound signal. I assume.
[0007]
Further, as a desirable form of the speaker driving device and the acoustic device equipped with
the same according to the present invention, the natural resonance frequency attenuation means
is constituted by either a digital circuit or an analog circuit, and at least one or more of the
speakers It is a band attenuation filter having a zero at a frequency that matches the resonant
frequency.
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[0008]
The operation of the above-described means will be described below.
The natural resonance frequency attenuation means attenuates the frequency band which
becomes the unique resonance frequency of each speaker from the electric sound signal inputted
to the speaker driving device, and the output of the natural resonance frequency attenuation
means drives the speaker via the output amplifier Then, since the sound pressure in the
resonance frequency band inherent to the speaker can be attenuated to drive the speaker, the
resonance of the speaker can be largely suppressed, and an acoustic output similar to the input
electroacoustic signal can be generated. It can be generated from the speaker.
[0009]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the
speaker driving device of the present invention and the acoustic apparatus equipped with the
same will be described with reference to FIGS. 1 to 3. FIG.
[0010]
FIG. 1 shows a schematic configuration of a speaker driving device 5 of the present invention.
The speaker driving device 5 is composed of natural resonance frequency attenuation means 2
and an output amplifier 3.
An electrical acoustic signal is input from the input terminal 1, and the signal level of the band
serving as the resonance frequency of the speaker 4 is attenuated by the natural resonance
frequency attenuation means 2 and becomes a signal for driving the speaker 4 via the output
amplifier 3.
[0011]
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FIG. 2 shows an acoustic output frequency characteristic in which an acoustic output due to
mechanical resonance of the speaker is added in addition to the electrical acoustic signal input to
the speaker 4.
The speaker 4 has a resonant frequency at frequencies f1, f2 and f3, and if there is a frequency
corresponding to these resonant frequencies in the input signal even if it is slight, it triggers a
resonance phenomenon, and the input signal A non-similar output with different parts will be
generated from the loudspeaker 4.
[0012]
FIG. 3 shows the frequency characteristics of a band attenuation filter (not shown) as an example
of the natural resonance frequency attenuation means 2. The band attenuation filter has zeros at
the resonance frequencies f1, f2 and f3 of the loudspeaker 4 referred to in FIG. 2 and exhibits
steep attenuation at these resonance frequencies. Using the current digital filter construction
technology, the above-mentioned steepness can be made very high and sufficient attenuation can
be obtained, and a band attenuation filter that is flat except for the attenuation band can be
easily obtained, and the construction scale Although it is small and economical, it is of course
possible to constitute the band attenuation filter with an analog filter.
[0013]
The electric acoustic signal inputted from the input terminal 1 is attenuated by the characteristic
resonance frequency attenuation means 2 described above by the resonance frequency of the
speaker 4 in the band of f1, f2 and f3 and amplified by the output amplifier 3, Since the speaker
4 is to be driven, the frequency at which the speaker 4 triggers the resonance phenomenon is
sufficiently attenuated, and the resonance is suppressed and the speaker 4 generates an acoustic
output similar to the input electroacoustic signal. be able to.
[0014]
Further, it goes without saying that the speaker drive device of the present invention can be used
alone, but it is clear that economical and high-sound quality acoustic equipment can be obtained
if it is mounted on an acoustic equipment.
[0015]
As described above, according to the speaker driving device of the present invention, a speaker
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having at least one or more unique resonance frequencies is electroacousticed by attenuating a
signal level at a frequency which becomes the unique resonance frequency. Since it can be driven
by a signal and the acoustic output generated by the speaker can be similar to the input electric
acoustic signal, the labor and cost required for vibration suppression of the speaker described in
the prior art 1) Too much, 2) speaker damping not only damps the inherent resonance frequency
but also greatly influences other frequencies, 3) various problems such as the sound output being
attenuated as a result of the speaker damping If the speaker driving device is mounted on an
audio device, it is economical and an audio device with high sound quality can be obtained.
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