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DESCRIPTION JP2009021854

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DESCRIPTION JP2009021854
The present invention makes it possible to reproduce high-pitched sound sources such as music
box sounds with high quality by a simple configuration. SOLUTION: A high tone digital sound
source data having a frequency in the range of 2 kHz to 4 kHz is stored in the sound source
means 11, and a piezoelectric element 14 having an audio reproducing function is adopted as an
audio output means. By utilizing the fact that the acoustic characteristics of 14 exist in the highpitched frequency band substantially coincident with the high-pitched digital sound source data
stored in the sound source means 11, the piezoelectric element 14 can be produced
inexpensively with a simple configuration. The high-pitched sound source like music box sound
etc. is suitably reproduced through the drive circuit. [Selected figure] Figure 1
Sound source reproduction device
[0001]
The present invention relates to a sound source reproduction apparatus configured to reproduce
digital sound source data stored in a sound source means by an audio reproduction means.
[0002]
Generally, a sound source reproducing apparatus is widely known which reproduces the digital
sound source data by inputting an output signal of digital sound source data stored in the sound
source means to the sound reproducing means through an appropriate drive circuit.
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And, when reproducing sound source data by such a sound source reproducing apparatus, when
high sound quality is required, or when sound source data consisting of multiple tones
constituting a chord (harmony) is reproduced with high quality, For example, as described in
Patent Document 1 below, a magnetic body driven speaker is usually used as the sound
reproduction means disposed at the final stage.
[0003]
That is, in the sound source reproduction apparatus using the magnetic substance drive type
speaker, for example, as shown in FIG. 3, first, the digital sound source data signal Sa emitted
from the sound source means 1 provided with desired digital sound source data is digital The
analog source data signal Sb is converted by the analog conversion means 2. Then, the analog
sound source data signal Sb output from the digital-to-analog conversion means 2 is input to the
audio amplifier 3 and amplified, and the audio output Sc having an analog waveform from the
audio amplifier 3 is magnetic using a voice coil. It is reproduced by the body drive type speaker
4.
[0004]
A sound source reproducing apparatus using such a magnetic substance drive type speaker 4 has
a problem that the power consumption tends to be increased and the relatively expensive
configuration can not but be obtained. There is an advantage that the characteristics are
excellent. In particular, it corresponds to high-pitched sounds with frequency components in the
frequency range of 2 kHz to 4 kHz, for example, metallic sounds such as music box sounds, glass
contact sounds such as glass percussion instruments, or similar sounds thereof It is common
knowledge of those skilled in the art that in the case of reproducing high-pitched digital sound
source data, it is not possible to reproduce with clear and high-quality sound unless the abovedescribed system using a magnetic body driven speaker is adopted. There is.
[0005]
On the other hand, as a sound source reproduction device having a simple configuration, for
example, a device using a piezoelectric element having an audio output function such as a
piezoelectric buzzer is known. Although this sound source reproducing apparatus using the
piezoelectric element has the advantage of being relatively inexpensive and capable of reducing
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power consumption, it is used to reproduce simple sounds such as warning sounds, for example,
because of poor acoustic characteristics. I'm stuck in the way. In particular, in the case of
reproducing sound source data corresponding to a high-pitched sound such as the music box
sound described above, it can not be adopted. As described above, in the conventional sound
source reproduction apparatus, it is considered impossible to reproduce digital sound source
data at a high pitch with high quality with low cost.
[0006]
Unexamined-Japanese-Patent No. 2007-165938
[0007]
Therefore, the object of the present invention is to provide a sound source reproducing
apparatus capable of reproducing high-pitched digital sound source data corresponding to a
high-pitched sound such as a music box sound with high quality sound quality with a simple
configuration. I assume.
[0008]
In order to achieve the above object, the present invention is configured to reproduce the digital
sound source data signal by outputting the digital sound source data signal stored in the sound
source means to the audio reproduction means through an appropriate drive circuit. Digital
sound source data stored in the sound source means includes high-pitched digital sound source
data corresponding to a high-pitched sound having a frequency component in the range of 2 kHz
to 4 kHz, and the high-pitched sound digital A configuration using a piezoelectric element having
an audio reproduction function is adopted as an audio reproduction means for the sound source
data signal.
[0009]
As described above, the present invention utilizes the fact that the acoustic characteristics of the
piezoelectric element having the sound reproduction function substantially match the frequency
of a high-pitched sound source such as an music box sound, etc., and has a simple configuration.
High-quality sound sources such as music box sounds are reproduced with high quality by
inexpensive piezoelectric elements and element drive circuits thereof.
[0010]
Further, according to the present invention, a binary amplification unit for amplifying the digital
excitation data signal given by pulse width modulation from the excitation unit to an appropriate
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output value, and a pulse width outputted from the binary amplification unit according to the
present invention It is possible to have a configuration including digital-to-analog conversion
means for demodulating the modulation signal and converting it to an analog sound source
signal.
[0011]
According to the present invention having such a configuration, the configuration of the drive
circuit of the piezoelectric element having the sound reproducing function can be made simple
and inexpensive.
[0012]
Further, in the present invention, the sound source means can be provided inside or outside of
the device.
[0013]
According to the present invention having such a configuration, it is possible to appropriately
select and manufacture a device in which the sound source means is integrated or separate, and
in particular when the sound source means is disposed outside the device, the sound source By
making the means detachable from the device, replacement with other sound source means is
easily performed.
[0014]
Further, in the present invention, the sound source means may be configured to simultaneously
output digital sound source data signals expanded to a plurality of different musical pitches.
[0015]
According to the present invention having such a configuration, reproduction of sound source
data consisting of multiple tones constituting a chord (harmony) is performed with a simple
configuration.
[0016]
Further, in the present invention, the piezoelectric element and its drive circuit are provided over
a plurality of systems, and the piezoelectric element constituting one of the plurality of systems
and the acoustic characteristics of the drive circuit constitute another system. It is possible to
have a configuration set so as to be different from the acoustic characteristics of the piezoelectric
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element being driven and the drive circuit thereof.
[0017]
According to the present invention having such a configuration, each of a plurality of systems of
piezoelectric elements having different acoustic characteristics has a good reproduction function
for different frequency bands of high pitch digital sound source data stored in the sound source
means. As a result, the high-pitched sound source is reproduced well over a wider range of
frequencies.
[0018]
As described above, according to the present invention, high-pitched digital sound source data
corresponding to high-pitched sound having a frequency in the range of 2 kHz to 4 kHz is stored
in the sound source means, and a piezoelectric element having an audio reproducing function is
provided. Using the fact that the acoustic characteristic of a piezoelectric element adopted as a
voice output means and having a voice reproduction function is present in a high tone frequency
band that substantially matches the high tone digital sound source data stored in the sound
source means The high-pitched sound source such as music box sound is reproduced with high
quality by using an inexpensive piezoelectric element with a simple configuration and its element
drive circuit. It is possible to inexpensively and significantly improve the usefulness and
reliability of various devices and tools using a sound source reproduction device that generates a
sound.
[0019]
Hereinafter, embodiments of the present invention will be described in detail based on the
drawings.
The sound source reproduction apparatus according to the first embodiment of the present
invention shown in FIG. 1 uses the music box timbre sound source 11 as sound source means
provided with high pitch digital sound source data.
That is, the music box timbre 11 provided in the sound source reproduction apparatus according
to the present embodiment has a high pitch such as a music box sound having a frequency
component in the range of 2 kHz to 4 kHz, or a pseudo sound similar thereto. Digital sound
source data having a high pitch equivalent to sound is stored.
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[0020]
The high tone digital sound source data stored in the music box timbre sound source 11 is
subjected to pulse width modulation (PWM) so as to be a pulse train having an appropriate time
width by a program or the like arranged inside the sound source. The sound source 11 is
configured to be output as a high-pitched digital sound source data signal S1.
Then, the high tone digital sound source data signal S1 outputted from the music box timbre
sound source 11 is inputted to a digital buffer 12 as a binary amplifying means constituting a
drive circuit of a piezoelectric element described later, and a desired output value is obtained
there. It is amplified to be
[0021]
Furthermore, the high tone digital source data signal S2 amplified and outputted by the abovementioned digital buffer 12 is a DA converter 13 corresponding to the PWM system as a digital /
analog conversion means constituting a drive circuit of a piezoelectric element described later. Is
input to
The D / A converter 13 has a function of converting the above-described high-pitched digital
sound source data signal S2 into an analog sound source signal S3 having an analog waveform
and outputting it.
A piezoelectric buzzer (piezoelectric speaker) 14 as a piezoelectric element having an audio
reproduction function is connected to the output side of the DA converter 13.
[0022]
The piezoelectric buzzer (piezoelectric speaker) 14 has a configuration in which bending
vibration of a diaphragm in which a piezoelectric element and a thin metal plate are laminated is
used as a generation source as is well known. In addition to the piezoelectric buzzers described
above, those having a wide variety of configurations such as a piezoelectric sounder can be
employed.
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[0023]
The piezoelectric buzzer (piezoelectric speaker) 14 having such a configuration generally has
acoustic characteristics in the high frequency range of 2 kHz to 4 kHz.
That is, the acoustic characteristics of the piezoelectric buzzer 14 are almost matched with the
frequency band of high tone digital sound source data (music box sound) stored in the music box
timbre sound source 11 described above.
Therefore, the piezoelectric buzzer 14 described above has a very good acoustic characteristic
with respect to the high tone digital sound source data signal S1 generated from the music box
timbre sound source 11, and is stored in the music box timbre sound source 11 as digital sound
source data. A high pitched sound including the music box sound or the pseudo sound similar
thereto is reproduced well in the piezoelectric buzzer 14 described above.
[0024]
As described above, in the present embodiment, the acoustic characteristics of the piezoelectric
buzzer (piezoelectric speaker) 14 adopted as the piezoelectric element having the sound
reproducing function are the music box sound etc. stored as the high pitch digital sound source
data in the music box timbre sound source 11. Using the low-pitched piezoelectric buzzer 14 and
its drive circuits 12 and 13 with a simple configuration and a high-pitched sound source
corresponding to an or-gone sound Is to be reproduced in high quality.
[0025]
Further, in the present embodiment, since inexpensive digital buffer 12 and DA converter 13 are
used as a drive circuit for piezoelectric buzzer (piezoelectric speaker) 14, the configuration of the
drive circuit for piezoelectric buzzer 14 is simple and inexpensive. Made to be.
[0026]
Furthermore, in the present embodiment, it is possible to provide the music box timbre tone
generator 11 as the tone source means described above either inside or outside the device, and
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the device in which the music box timbre tone generator 11 is integrated or separated is
optional. It can be manufactured.
At this time, especially if the music box tone color sound source 11 disposed outside the
apparatus is configured to be detachable, it can be easily replaced with another sound source
means.
[0027]
On the other hand, in the second embodiment shown in FIG. 2, the high-pitched digital sound
source data signal S21 developed so that the music box timbre sound source 21 constitutes two
different musical pitches, that is, a harmony. , S21 'at the same time.
The respective high-pitched digital sound source data signals S21 and S21 'are respectively input
to digital buffers 22 and 22' as binary amplifying means constituting drive circuits provided
corresponding to the respective ones, where desired outputs are provided. It is amplified to be
[0028]
Further, the high-pitched digital sound source data signals S22 and S22 'amplified and outputted
by the digital buffers 22 and 22' constituting the respective drive circuits described above are
digital-to-analog conversion means similarly constituting the drive circuit. As a piezoelectric
element having a sound reproducing function on the output side of each of the D / A converters
23 and 23 'corresponding to the PWM method as a piezoelectric buzzer 24 (piezoelectric
speaker) 24 'is connected to each other.
[0029]
As said piezoelectric buzzer (piezoelectric speaker) 24 and 24 'in this embodiment, what has a
mutually different acoustic characteristic is employ | adopted, and the peak setting value of the
piezoelectric buzzer 24 arrange | positioned at illustration upper side is 2 kilohertz, for example.
In contrast to the setting, the peak setting value of the piezoelectric buzzer 24 'disposed at the
lower side in the drawing is set to, for example, 4 kHz.
[0030]
According to the present embodiment having such a configuration, each of the two systems of
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piezoelectric buzzers (piezoelectric speakers) 24 and 24 ′ having different acoustic
characteristics has high-pitched digital sound source data stored in the music box timbre sound
source 21. It becomes to have a good reproduction function for different frequency bands, and a
high-pitched sound source can be reproduced well over a wider frequency range.
[0031]
As mentioned above, although embodiment of the invention made by this inventor was described
concretely, this invention is not limited to the said embodiment, It is said that it can be variously
deformed in the range which does not deviate from the summary. It's too late.
[0032]
For example, in each of the embodiments described above, a music box timbre sound source is
used as the sound source means, but other metallic sounds, glass contact sounds such as glass
percussion, or pseudo sounds similar thereto are used. It is likewise possible to employ sound
source means comprising digital sound source data corresponding to a high pitch equivalent to a
wide variety of high pitch sounds.
[0033]
In the above-described second embodiment, although two systems of piezoelectric elements and
their drive circuits are provided, three or more systems of piezoelectric elements and their drive
circuits may be provided. It is.
[0034]
Furthermore, it is naturally possible to change the drive circuit using the digital buffer employed
in each of the above-described embodiments to various other various drive circuits using
transistors and the like.
[0035]
As described above, the present invention corresponds to a wide variety of high-pitched sounds
such as music box sounds, other metallic sounds, glass contact sounds such as glass percussion,
or pseudo sounds similar to them. The present invention can be widely applied to the
reproduction device of the sound source means.
[0036]
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BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which represented roughly the
whole structure of the sound source reproduction | regeneration apparatus concerning the 1st
Embodiment of this invention.
FIG. 7 is a block diagram schematically showing an entire configuration of a sound source
reproduction device according to a second embodiment of the present invention.
FIG. 1 is a block diagram schematically showing an entire configuration of a generally used
sound source reproduction device.
Explanation of sign
[0037]
11 music box tone color source (sound source means) 12 digital buffer (binary amplification
means) 13 PWM system DA converter 14 piezoelectric buzzer (piezoelectric element) 21 music
box timbre sound source (sound source means) 22, 22 'digital buffer (binary amplification means
) 23,23 'PWM system DA converter 24, 24' Piezo buzzer (piezoelectric element)
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