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The present invention provides an electroacoustic transducer that converts the encoded digital
electrical signal directly into an analog acoustic signal. (Similar telecommunication systems use
r'cu Iber even in the audio frequency range, but the reason is that it is more noise than
conventional tone [1] tone and analog signals. In the ground of basic Merino l □, which says that
it is difficult to prevent the damage by '3 h [2] and thus the large kinaminoc range is large and
low distortion can be transmitted, it is possible to record in a large capacity memory, video and
other data It is because it has immeasurable merits in terms of signal processing, such as
synthesis analysis of signals using a signal processor by integrating. Conventionally, in order to
finally convert the encoded digital electrical signal having such features 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 a normal electrical acoustic transducer. The method of conversion was
common. 1 ~ Although this method is not only expensive and requires an A converter, it also
requires an output amplifier that can withstand the maximum value of the converted analog
electrical signal, so that the normal output is small compared to the capacity of the amplifier and
uneconomical And there is a drawback that the intrinsic merits of digital signal processing are
reduced, such as the increase of nonlinear distortion and the limitation of gain 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 Japanese Patent Publication No.
54-12049, there is disclosed 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 a
sliding plate of one quotient. Is an electrodynamic transducer as a series of dimensions 61],
which operate in practice but are in fact piezoelectric in nature, so that the correct signal for the
1Hll oscillations is +4 um, Sr-B 9 (7) A single coil is wound around a common coiled frame [-1
There is a speaker with a structure in which this coiled frame is connected to a diaphragm, but a
speaker with this structure has an input signal pulse The voice coil of the bit which does not
work also reduces the efficiency by the back electromotive force because it moves, or in the case
of many bits, the number of coils and the coil weight increase; r1: increases and the vibration
system becomes excessive and realized as a speaker 1ΔJ ” It is j ++ #. The present invention tri
ii pre-electric signal can be directly converted to analog acoustic signal -J-without the abovementioned drawbacks f: "t" digital l '11j signal can be directly converted to analog acoustic signal
without using the above described residual signal processing merit ILi It relates to an acoustic
transducer. The principle of operation and the structure of 4f6 will be described in detail with
reference to FIGS. 1 (a), (b), (c), (d) and FIGS. 2 and 3 below.
The 11m (a), (1)), (c), (d) is an example showing the correspondence between the encoding and
the waveform of the signal imprinted on the electrical Fjr Q'JJ conversion test of the present
application. FIG. 1 (a) shows the correspondence between the analog number and the digital
number. The most significant bit (M S B) of the Nu bit number is a bit for discriminating the
polarity of the analog signal. The analog one is converted to a binary code consisting of the
remaining N-1 bits. Each corresponding bit, for example, the N to -21st bit corresponds to 2 in
the original analog value, but this corresponding analog value is referred to as bit handling. Still
(MS B) will be 1 if the corresponding analog signal is positive and O 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... Are
electric pulses of the first bit, 2 +) ′, 21)... Are electric panus of the second bit, (N−1) 1). (N-1)
b... Represent N-1 bit electrical pulses, and M b, IVI b... Represent (MSB ') electrical pulses.
Moreover, dotted line A is an analog signal, AS +). AS b − is the sampled analog signal. Fig. 1 (c)
(r: L) is a digital electric signal waveform applied to an electroacoustic transducer using one drive
method of the present invention. These signals are digital electric codes composed of constant
amplitude pulses whose polarity is defined by 1VjSB signal. FIG. 1 (d) shows the sound pressure
radiated from the sound generation part of each bit of the electro-acoustic transducer of the
present invention and the all-bit synthetic sound pressure waveform. A structure in which the
sounding part of the converter coupled to each bit is proportional to the bit position of each bit
so that the applied signal pulse has a constant amplitude, or a sound pressure can be emitted, or
It needs to be. 1d, 1 (1 is the sound pressure radiated from the sound producing portion
corresponding to the first bit, and assuming this sound pressure to be 1, the sound pressure 2d
corresponding to the second bit 2d,... Sound pressure (N, -1) d corresponding to N-1 bit below (N1 Sound pressure from these valley sounding parts is spatially synthesized to become AS (-1, AS
d · · · If this is averaged, an acoustic signal Ad (dotted line) equal to the original analog waveform
is obtained. FIGS. 2 (a) and 2 (b) show the structure of Example 1 of the electroacoustic
transducer of the present invention. 31.32... 3CN-1) are N-1 independent electrostatic elements,
each coupled to the output terminal of the corresponding bit and having an area proportional to
the weight of each bit.
2 is a support, and each electrostatic element is assembled in close proximity to each other by
the support to form-electroacoustic transducers. In addition, instead of individual electrostatic
and mold elements, as shown in FIG. 2C, a common back frame is completely formed on a
common frame 2 as shown in FIG. 2C, and diaphragms divided for each bit are individually
supported The structure supported by 2 may be adopted. Similarly, this configuration is also
applied to the following embodiments. FIG. 1 is a connection diagram showing the connection
between the converter of the present invention and a signal source. A valley S is a polarity
switching circuit, 7 is a polarity determination circuit, and 8 is a bias voltage power supply.
When a pulse signal of a constant voltage shown in FIG. 1 (c) is applied to each electrostatic
element, each electrostatic element vibrates with the same amplitude, and each is proportional to
the weight of the focus. The sound pressure is proportional to the weight as shown in FIG. 1 (d),
that is, the electrostatic type element corresponding to the first bit generally corresponds to N-1
bit, ld, ld... The piezoelectric element emits (N-1) d, (N-1) d,. The sound pressure emitted from
each of these elements is turned on synthetically in space, and is averaged to produce an analog
signal Ad shown by a dotted line + Ij. At this time, since each electrostatic type element is
independent, the electrostatic type element for which the pulse signal has not been opened does
not operate, and the driving force is generated only to a part of the striking integrated
piezoelectric element of the conventional example. The other parts do not become mechanical
load, and do not adversely affect the operation of the driven part due to minute-one vibration,
and the original analog signal can be reproduced extremely faithfully 8 Tani Sei 'consume 1h
constituting the electro-acoustic transducer of the invention! ! The element is the least weighted
bit pair of 7 bits in FIG. The center of each element is spirally densely arranged in an array I-,
with the element r at the center. By arranging the electrostatic elements in this manner, it is
characterized that the acoustic coupling between the valley elements becomes closer. A further
diagram (a), (+) is a working row (2) of the pond of the electroacoustic transducer according to
the invention, in which the electrostatics of the other beats centering on the static element
coupled to the first bit It is characterized in that the type elements are arranged concentrically
and the acoustic coupling between valley electrostatic type elements is close and the symmetry
of the radiated sound field is good. FIGS. 7 (a) and 7 (b) show another embodiment (3) of the
present invention in which rectangular elements are arranged in a straight line. Figures g (a) and
(b) are characterized in that each element has a shape that can be easily manufactured and that
the directivity is good because the configuration is narrow, and (b) shows Example (4) of the
present invention. In the structure of FIG. 7, the electrostatic element corresponding to the pond
bit excluding the least bit is divided into two, and each half is sequentially arranged linearly on
both sides of the electrostatic element corresponding to the least bit. It is an array of parallelconnected electrostatic elements of the same bit that are divided, so that the elements are easily
fabricated, the directivity is good, and the acoustic coupling of the elements is dense. It is
characteristic that there is.
Figures (a) and (b) show the electroacoustic transducers shown in Figures 1 (a) and (b), Figures 7
(a) and (b), and Figures 5 (a) and (b) respectively. FIG. 7 is a cross-sectional view of a modified
embodiment of (The same numbers are assigned to the corresponding parts in each drawing). 4.
corresponding to each electrostatic element 31 °: 32-3 (N -1) that constitutes each electricity i
change in depth 1 de l (Same as Germany connected to (N-1)) r-puh-on 5],... 52... 5 (N-, 1) is a
combination of horns 6. Both have high efficiency, and have an advantage of being able to direct
1 ', 3%,-----@ N-depending on the shape of the horn. In this case, combining (N-1) static elements
(-to a common 1 to an 1 horn is a common void where iWj VCs of horn throats are present) The
volume of the sky forms a heavenly hair <-> acoustic high-cut filter Nodame +14 of the high-pass
runs fast, against high-gage realism l, l (in the method Absent. 1r ′ · j, as an all-rounder example
of the present invention, other than the above, “two-point change: acoustics such as force
shuttling ear hats”; The present invention provides (N-1) pieces of 醍 J 頓 having an area 111-compared to the weight of each of the N-bit encoded digital electrical signals. An electroacoustic
transducer that couples an element to each bit output of an amplifier and spatially synthesizes
the acoustic energy radiated from each piezoelectric element to obtain an analog acoustic signal,
such as a PCM phone, speech synthesizer, or It has a very wide range of applications throughout
audio equipment.
Brief description of the drawings
Fig.1 (a) Diagram showing correspondence between Iti analog value and N-bit binary code value,
Fig.1 (b) is a correspondence diagram of sampled analog signal, N-bit binary code value and
digital electric signal The figure (c) is a waveform diagram of the digital electrical signal applied
to the electrical g-echo converter of the present invention, and the figure (d) is a diagram when it
is driven by the electrical signal shown in the figure (c). The wave form of each of the output
sound pressure of the valley | pit t * corresponding element of an electroacoustic transducer of
this invention, and the acoustic signal by which space synthesis was carried out.
Fig. 2 (a) is an embodiment of the electro-acoustic transducer according to the present invention
(front view of cocoon, Fig. 2 (b) is a side sectional view, Fig. 2 (C) shows another structure: year
← company day Fig. 1 is a connection diagram showing the connection with a digital signal
source on an electroacoustic transducer according to the present invention, Fig. 1 (a) ', (b) is a
husband of the electroacoustic transducer of the present invention · Example c2), -Front view and
2 showing the embodiment (3) and the embodiment (4) [IUi, Fig. (A), (b), zg (a), (b), 0 " One figure
(a), (1! +) Is a front view and a top view of an embodiment in which the horns are coupled,
respectively. Each supporting piezoelectric element corresponding to 2 pieces of support body,
31.32 · · · 3 (N-1) is 1 city [」bit, second bit · · · · N-1 @ eye bit, 41.42 · 4 (N -1) H Each
corresponding horn throat, 51 ° 52-5 (N 1) is also the corresponding corresponding sound path
(b) (^) in the LF diagram (G (G) (g) (g) (b) (L) Ya ': /) co (b) <a-) years old Figure 01
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