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According to the present invention, an electroacoustic transducer that directly converts encoded
digital electric signal ? into an analog acoustic signal is generated <<, and thus a basic
dynamical source is large and transmission of low distortion is possible. In addition to this, it has
immeasurable merits in terms of signal processing, such as recording in a large-capacity memory,
integration of video and other takes with a processor, and signal synthesis analysis. is there.
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, and this is converted into an acoustic signal by an ordinary electrical acoustic
transducer. The method of converting to 'was common. 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, so that the normal output is small
and uneconomical compared to the capacity of the amplifier. There is a drawback that the
inherent merits of digital signal processing are reduced, such as the increase of the distortion in
the emergency and the limitation of the dynamic range. There are electro-acoustic transducers
which directly convert digital signals into analog acoustic signals in order to eliminate these
drawbacks. For example, Japanese Patent Publication No. 54-12049 discloses a transducer
having a structure in which one piezoelectric element is provided with an electrode for the
number of bits and this piezoelectric element is coupled to one diaphragm. In fact, it is difficult to
accurately reproduce the signal due to the division vibration of the piezoelectric element in
practice. O As another example, an electrodynamic transducer, which has a number of voice coils
in common common to the number of bits. Although there is a speaker with a structure in which
a winding frame is wound on a frame and a winding frame is connected to a single diaphragm,
the four-beaker of this structure also moves the voice coil of a bit without a manual signal pulse
In addition, it is difficult to realize as a cis-beaker in which the vibration system becomes
excessive when the efficiency is lowered by the back electromotive force or the number of coils
and the coil weight are increased in the case of a large number of bits. The present invention
relates to an electro-acoustic transducer drive system capable of directly converting a digital
electrical signal into an analog acoustic signal without losing the merits of the digital signal
processing and eliminating all the above-mentioned drawbacks. The operating principle and
system will be described in detail with reference to FIGS. 1 (a), (b), (c '), (d) and FIGS. 2 and 3.
Figures 1 (a), (b). (C) and ('d) are an example showing the correspondence of the encoding of the
signal in the feeling of driving force of an electroacoustic transducer of this application, and a
waveform. FIG. 1 (a) shows the correspondence between the number of analog and the number
of digital, and N is the number of focusing points and the most significant digit thereof (MSB) is a
bit for discriminating the polarity of analog signals.
The analog value is converted to a binary code consisting of the remaining 9 N-1 bits. Although
each bit, for example, the (N-1) th bit node corresponds to 2N-2 in the original analog value, this
corresponding analog value is referred to as a focus weight. The key (MSB) is 1 if the
corresponding analog signal is positive and 0 if it is negative. FIG. 1 (b) is a digital electrical
signal in which the signal represented by the binary code in FIG. 1 (a) is a digital electrical signal,
and the code 1 corresponds to one electrical pulse. In the figure, 1 b, 1 b ?...-Is the electric bit of
the first bit, 2 b, 2 b ?... Is the electric pulse of the second bit, C ? ? ?1) b, ( N-1) b '...
Represent N-1 bit electric pulses, and Mb, Mb'... Represent (MSB) electric pulses. Also, dotted line
A is an analog signal. ASb, ASb... Are the sampled analogizations. FIG. 1 (c) is a digital electrical
signal waveform applied to an electroacoustic transducer using the driving method of the present
invention. These signals are controlled by the constant amplitude pulse whose polarity is defined
by the ASb signal! : L ff1i is a digital electrical signal to be generated. FIG. 1 cd) shows the sound
pressure radiated from the sound producing portion of each hit of the electro-acoustic transducer
of the driving system of the present invention and the total pit synthesis t4 pressure waveform
thereof. Since the applied signal pulse has a constant amplitude, the sounding part of the
converter coupled to each bit is a structure or a driving system that emits sound pressure
proportional to the weight of each bit and fj) There is a need. That is, 1 ? (1, 1d... Is the sound
pressure radiated from the sound generating portion corresponding to @ 1 bit, and if this 1 ░
bland 7 is 1, the sound pressure corresponding to the second bit is 24 ░ 2 d ? ииии has a
magnitude 2 and the sound pressure (N?1) d corresponding to N?1 bits, (N?1) d ?... has a
magnitude 2N?2 Is required. The sound pressure from each of these sound producing parts is
spatially synthesized, and if this is averaged, an acoustic signal Ad equal to the original analog
waveform is formed. FIG. 2 shows the basic structure of the electroacoustic transducer used in
the drive-power type of the present invention. The same parts below C are indicated by the same
number. ) 81, 32. .. 3 (N-1) are equal impedances (N-1> electrostatic elements), and are
supported by a common support 2 respectively. The above (N-1) electrostatic elements usually
use the same kind of elements, but generally, if the impedances have the same value as described
above, they do not necessarily have to be the same.
As shown in FIG. 2C, instead of individual electrostatic elements, a common back electrode
summer is formed on a common frame 2 ', and diaphragms divided for each bit are individually
supported frame 2 The structure may be supported by "." In addition, this structure is applied
also to the following actual examples. No. 3121 lamp In the driving method of the present
invention, N temperature day / curl '1 [j, sudden notice -7r'J1. FIG. 10 is a connection diagram
showing the connection of the heat phase lf with the electroacoustic transducer of the present
invention. sl, s2, и, 'S (N-, 1) is the MSB polarity discrimination signal l s j j 12/12 ? ? 1 ? ? ?
? ? ? 37 ? 37' ?; Path; 4d-polarity determination circuit for operating each switching circuit;
5 is a bias voltage power supply circuit. A bias voltage of E +, E2-E (N-1), which is proportional to
the weight of each bit, is applied from the bias voltage / B; i5 to the (N-1) electrostatic type
elements. It should be noted that it is convenient to make the respective bias voltages variable,
because it is possible to make the variation in the mutual performance of the ": electrostatic
devices j" different from each other. As described above, when a bias voltage proportional to
1?f: f ? ii 4 (? ? is applied to each element, each electrostatic element is electroacoustic in
proportion to the weight of the heat of J1. When the dephasing electrical signal of constant
amplitude shown in FIG. 1 (c /) is applied to each electrostatic element, the electric lightning
pulse is applied. The sound pressure proportional to the weight of the bit saved from the
electrostatic element is reflected one by one, and the 11 pressures emitted from the electrostatic
element corresponding to the other bits are combined in space, as shown in FIG. Re-radiate the
analog acoustic signal shown in At this time, since each electrostatic type element is independent,
the electrostatic type element to which the pulse signal is not applied does not operate, and the
driving force is applied to only a part of the integrated piezoelectric conversion element
according to the conventional example. (D mechanical load or division vibration does not
adversely affect the operation of one driven part, and the original analog signal is faithfully
reproduced) Can. The shape and arrangement of the electrostatic elements constituting the
electrostatic electroacoustic transducer in the present invention are not limited to those shown in
FIG. As shown in FIG. 4, the centers of the respective electrostatic elements are closely arranged
in a spiral and the acoustic coupling between the elements is intimately arranged, and as shown
in FIG. 5, the ring-like elements are arranged concentrically. A close acoustic coupling between
the electrostatic elements and a good symmetry of the radiated sound field, or a rectangular form
in which each electrostatic element has a rectangular shape, and What each independent horn
was couple | bonded with each electrostatic-type element of the electroacoustic transducer of
each structure (drawing abbreviation | omission) Moreover, based on the electroacoustic
transducer of said each structure, what couple | bonded the other acoustic circuit element ( The
same is also included.
As mentioned above, the present invention is proportional to the weight of each of the
electrostatic elements of the electroacoustic transducer holding the (N-1) electrostatic elements
of equal impedance on the support. By applying a bias voltage, the electroacoustic conversion
efficiency of each electrostatic element is made proportional to the weight of each bit, and by
applying an N-bit coded digital electric signal, it is possible to make the Tentar electric signal
zero. The present invention relates to a driving method of an electrostatic electroacoustic
transducer having wide practicality in the fields of fi, POM telephone neck, voice synthesis
equipment, audio equipment, etc., which can directly convert analog sound into analog sound. It
is a thing.
Brief description of the drawings
Figures 1 (a '), (b), (c), and (d) show the correspondences between analog values and N-bit binary
codes, respectively, and the waveforms obtained by sampling the binary codes with N-bit digital
codes. They are a corresponding | compatible figure of the waveform of an analog signal, the N-1
focus digital electric emergency signal waveform figure applied to a converter, and the output
sound pressure waveform figure of a converter.
Fig. 2 (a), (b), (c) are front and sectional views of the electroacoustic transducer constituting the
present invention,-a sectional view showing another structure, and Fig. 3 is an electroacoustic
transducer and digital electricity. FIG. 4 is a front view of an embodiment of the electro-acoustic
transducer of the present invention, and FIG. 5 is a front view of another embodiment of the
present invention. Completed. Year 2 + 21 ya 3) Country ya Ll-1 co. Left) 2 Procedure
amendment (spontaneous) 1 Display of the case 1958 patent application No. 76866 No. 2 title of
the invention Driving method of electrostatic type electroacoustic transducer 3 Name of person
making corrections (027) Representative of Onkiyo Co., Ltd. Takeshi Goshiro 4, agent
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