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The present invention relates to an electroacoustic transducer that converts encoded digital
electrical signals directly into analog acoustic signals. In recent telecommunications, PCM signals
are also used in the audio frequency range, but this is because noise is more likely to be
generated compared to conventional 'in-eye modulation and analog signals << In addition to the
basic merits of large and low distortion transmission, it can be recorded on a large-capacity
memory, and integrated with video and other takes to analyze the signal using a synthesizer. This
is because it has immeasurable merits in terms of equal signal processing. Conventionally, in
order to finally convert an encoded digital electrical signal having such a feature into an acoustic
signal, it is converted into an analog electrical signal by an electrical A converter. A general
method is to convert this into an acoustic signal with a conventional electroacoustic transducer.
However, this method is not only expensive and requires an A-converter, but also requires an
output amplifier that can withstand the maximum value of the converted analog electrical signal,
making the common output smaller and less economical than the capacity of the amplifier. There
is a drawback that the inherent merits of digital signal processing are reduced, such as increased
nonlinear distortion and limited dynamic range. There are electro-acoustic transducers which
convert digital electrical signals directly into analog acoustic signals in order to eliminate these
drawbacks. For example, in, a transducer having a structure in which one
piezoelectric element is provided with electrodes corresponding to the number of nodes and this
piezoelectric element is connected to one diaphragm is started. Another example is an
electrodynamic transducer, in which a speaker having a structure in which the number of voice
coils equal to the number of voices is wound on a common winding frame and this winding frame
is coupled to one diaphragm is present. However, since the speaker of this structure also moves
the voice coil of a bit without an input signal pulse, the efficiency is reduced due to back
electromotive force, and in the case of a large number of bits, the number of coils and the co-coil
weight increase. Vibration system is excessive and difficult to realize as a fl s beaker The present
invention relates to an electroacoustic transducer capable of directly converting a digital
electrical signal into an analog acoustic signal without losing the merits of the digital signal
processing. The operating principle and structure will be described in detail with reference to
FIGS. 1 (a), (b), (c), (d) and FIGS. 2 and 3. FIGS. 1 (a) and (b L (c L (d)) are an example showing the
correspondence between the encoding of the signal applied to the electroacoustic transducer of
the present invention and the waveform.
FIG. 1 (a) shows the correspondence between the analog number and the digital number, N is the
number of focus, and the MSB of the most significant digit (MSB) is a hint for determining the
polarity of the analog signal. The analog value is converted to a binary code consisting of the
remaining N-1 bits. Although each bit, for example the N-1 bit, corresponds to 2 in the original
analog-20 value, this corresponding analog value is referred to as the bit weight. Also, (MSB) is 1
if the corresponding analog signal is positive and 0 if it is negative. FIG. 1 (b) is a digital electric
signal in which the signal represented by the binary code in FIG. 1 ('a,) is a digital electric signal,
and the code 1 corresponds to one electric pulse. In the figure, 1b, lb '.. is the first bit electric
pulse, 2b. , I2b 'is the second bit electric pulse, (N-1) b, (N-1) b' .. is the electric pulse of N-1 focus,
and Mb, Ml) 'is (MSB) Each represents an electrical pulse. The dotted line A is an analog signal,
and ASb, ASb '... FIG. 1 (c) is a digital electrical signal waveform applied to an electroacoustic
transducer using the drive scheme of the present invention. These signals are digital electrical
signals composed of after-sizing [-1 co-pulses whose polarity is defined by the MsB signal. FIG. 1
(d) shows the sound pressure radiated from the sound producing portion of each bit of the
electro-acoustic transducer of the present invention and the total focus synthesized sound
pressure waveform thereof. Since the applied signal pulse is a residual amplitude, the sounding
part of the transducer coupled to each bit needs to be a structure or drive system capable of
emitting sound pressure proportional to the weight of each bit is there. That is, 1 d, 1 d ′,... Are
sound pressure radiated from the sound producing portion corresponding to the first band,
assuming that the sound pressure is 1, and the sound pressure 2 d, 2 d ′ corresponding to the
second bit is The sound pressure (N-1) d, (N '-' 1) d 'corresponding to N-1 focus is required to be
2N-2 below. The sound pressure from each of these sound producing parts is spatially
synthesized to become ASd and ASd ', and when these are averaged, an acoustic signal Ad (dotted
line) equal to the original analog waveform is obtained. 2 (a) and 2 (b) are a front view and a
cross-sectional view, respectively, of the electroacoustic transducer of the present invention. 3-1.
. 3-2) n 'N-1) are N-1 independent conductors, equal in length, each having a width proportional
to the weight of the corresponding bit, and one flat, one mutually The diaphragm 2 is formed by
any suitable means such as etching and printing.
What is the diaphragm 2? A gas-tight thin film (eg, plastic 7 film, etc.) is used. A magnetic circuit
4 forms a magnetic field 5 in the magnetic gap, the diaphragm 2 is disposed in the magnetic field
5, and the magnetic flux in the gap is supported parallel to the diaphragm surface and
orthogonal to the rod. It is held in place by the tool 6, 6 '. FIG. 3 is a schematic diagram showing
the interconnection of N-bit digital electrical signals with the electro-acoustic transducer of the
present invention. Each conductor corresponding to each focus has the same number as FIG. S-1,
S-2,..., 5XL (N-1) are switch circuits for operating with the polarity determination signal of MSH
to switch the polarity of signal 1, and "7" is a polarity determination circuit. The pulse number is
the residual amplitude (constant voltage), and the conductor corresponding to each bit of the
converter has a fixed length, each having a width proportional to the bit weight, that is, a weight,
Because it has an electrical resistance value, currents 1-1.l-2, 1- (N-1) proportional to the weight
of each node flow, and the magnetic flux density x 4 body length × in the conduction of each
individual · · The driving force represented by the inflow current value is generated, and as a
result, a sound pressure proportional to the weight of each bit is emitted, and these are
synthesized in space to obtain the analog sound signal shown in FIG. 1 (d). Radiate. FIG. 4 is a
cross-sectional view of another embodiment of the present invention, in which the (N-1)
conductors parallel in length and proportional to the width or the weight of each node are
parallel on the thin film dielectric plate 2. Can be formed independently of each other and
supported by the support 6 ° 6 'of each evening by supporting the gap between the conductors
adjacent to each other so that each conductor and its neighboring diaphragm can operate
independently without mutually affecting each other As such, they are disposed in the common
magnetic gap 5. In the electro-acoustic transducer of this configuration, only the conductor to
which the zero-year electrical pulse is applied moves), so distortion due to the interference of the
conductor is excellent. The front view and the cross section of the high-fidelity regenerated kami
In the figure, on the diaphragm 2 (an N-1 solid conductor whose length is equal to the width and
the width is proportional to the weight of each focus is centered on the conductor of the
minimum weight, and 11 reconnaissances of the weight and jl The diaphragms are arranged
concentrically, and the diaphragms are arranged in a magnetic gap having a magnetic field which
is radially with respect to the center of the concentric circles and parallel to the plane of the
diaphragm. A magnetic circuit 4 generates the radial magnetic field in the air gap 5, and 8 and 8
'a diaphragm support. The diaphragm is supported so that the concentric conductor is at a
predetermined position in the magnetic air gap 5 described above. This type of transducer has a
diametrically symmetrical diaphragm shape with a small weight conductor, and conductors with
a large weight are sequentially surrounded around the conductor of the small weight, so that the
acoustic coupling between the conductors is tight and the surrounding sound The symmetry and
directivity of the pressure distribution become good, and in the case of the same diaphragm area,
it is compared with that of the linear conductor.
As described in the following "2", the present invention is an oscillation made of an electrically
insulating thin film in which N-1 equal conductors having a width proportional to the weight of
each bit are formed on the surface in parallel. An electroacoustic transducer having a structure in
which the plate 2 is installed in a magnet i parallel to the diaphragm and orthogonal to the
conductor, and applying N-bit encoded digital electrical signals to each conductor of the
electroacoustic transducer It is possible to convert directly into analog sound signals, and has
wide practical use in the field of telephones, speech synthesizers, audio, etc., which is an
extremely useful invention.
Brief description of the drawings
Figures 1 (a), (bL (c '), and (d) are the correspondence diagrams between the analog value and the
N-hit binary code, respectively, and the waveform obtained by N bi-thossically coding the binary
code and the sampled analog signal FIG. 6 is a waveform correspondence diagram, an N−1
hinted electrical signal waveform diagram applied to a converter, and an output sound pressure
waveform diagram of the converter.
2 ('a) and 2 (b) are a front view and a cross-sectional view of the electro-acoustic transducer of
the present invention, FIG. 3 is a connection diagram of the electro-acoustic transducer of the
present invention and a test electrical signal source, FIG. FIG. 5 is a cross-sectional view of
another embodiment of the present invention, FIG. 5 jg (a). (B) is a front view and sectional
drawing of the further another Example of this invention. 2 is a diaphragm, 3-1.8-2. .. 3- (n-1) is a
conductor, 4 is a magnetic circuit, 5 is a magnetic gap, 6 [deg.] 6 ', 6u, 6ut are supports. (1) One
(oL) age 21st year 31 force mark Connection (leg (^) / I7! 5th
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