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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to
dynamic speakers, and more particularly to dynamic speakers for reproducing digital audio
2. Description of the Related Art In a conventional dynamic speaker, a diaphragm having a coil is
disposed in a direct current magnetic field, and the diaphragm is displaced in proportion to an
audio current flowing through the coil to obtain a sound wave. In this case, the audio current
supplied to the coil is a current proportional to the analog audio signal.
As described above, the conventional dynamic speaker drives the diaphragm with a current
proportional to the analog audio signal. Therefore, the digital audio signal reproduced by a digital
disk player, digital audio tape recorder, etc. can not be directly driven, and the digital audio
signal is once converted to an analog audio signal by a D / A converter, Amplification is required.
In particular, not only the fidelity is affected by the accuracy, phase characteristics, etc. of the D /
A converter, but also the performance of the audio amplifier is limited. Can not do it.
An object of the present invention is to provide a dynamic speaker capable of faithfully
reproducing information contained in a digital audio signal.
According to the dynamic speaker of the present invention, a plurality of voice coils
corresponding to respective bits of parallel digital audio signals are provided on a diaphragm,
and the number of windings of the plurality of voice coils is And the weight of each bit of the
parallel digital audio signal.
Next, the present invention will be described with reference to the drawings.
FIG. 1 is a view showing an embodiment of the present invention, wherein (a) is a front view and
(b) is a cross-sectional view taken along the line A-A 'shown in (a).
In the figure, a fixed frame 10, a diaphragm 20, a plurality of coil bobbins 31 to 34 fixed to the
diaphragm 20, voice coils 41 to 44 respectively wound on the coil bobbins 31 to 34, and voice
coils 41 The magnets 51 to 54 for applying a direct current magnetic field to -44, the yoke 60
and center poles 71 to 74 for forming a magnetic circuit, and the damper 80 for holding the
diaphragm 20 are provided.
Each voice coil 41 to 44 is provided corresponding to each parallel bit (four bits in this
embodiment) of the parallel digital voice signal to be applied, and has a number of turns
proportional to the bit weight. There is.
Here, by supplying the drive current of each corresponding bit of the parallel digital audio signal
to each voice coil 41 to 44, the diaphragm 20 is made to have the displacement corresponding to
the weight of each bit of the digital audio signal. As it receives and vibrates, it is possible to
convert the digital sound signal directly into sound waves.
In the present embodiment, the number of parallel bits of the digital voice signal is set to 4 bits
to simplify the description, but even when the number of bits is large, a voice coil is provided
corresponding to the number of bits. Can operate similarly.
As described above, in the dynamic speaker according to the present invention, the voice coil is
provided corresponding to each bit of the parallel digital voice signal, and the number of turns of
each voice coil is the weight of the corresponding bit. Parallel digital audio signals can be
converted directly to sound waves by making them proportional to.
Therefore, a D / A converter and an analog amplifier are not required, and the information of the
digital audio signal can be faithfully reproduced by the speaker.
Brief description of the drawings
1 is a view showing an embodiment of the present invention, (a) is a front view, (b) is a crosssectional view taken along the line A-A 'shown in (a).
Explanation of sign
20 diaphragm 31-34 coil bobbin 41-44 voice coil
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