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JPS5995796

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DESCRIPTION JPS5995796
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
digital speaker applied to an apparatus for reproducing a Pulse Code Modulation (PCM) -ized
audio signal. Background art and its problems In recent years, also in the field of audio
equipment, improvement in S / N ratio and dynamic range expansion at the stage of recording,
reproducing and amplifying an audio signal by treating the audio signal as PCM. Because there
are various merits such as the reduction of non-linear distortion, PCM conversion of audio
signals is eagerly adopted. By the way, in order to digitize an audio signal waveform which is an
analog signal, sampling is performed at a repetition frequency twice as high as the highest
frequency included in the audio signal according to the sampling theorem, and the sampled value
is converted to a binary code. It is known that it is better to do this, but in order to reproduce the
original audio signal from this binary code, it is necessary to provide a D / A conversion function
in any path of the reproduction system. Therefore, various digital speakers that perform direct D
/ A conversion in the process of electro-acoustic conversion have been proposed. In a
conventional digital speaker, a parallel PCM digital signal as an audio signal is directly supplied
to a drive unit to drive a power corresponding to the weight of each bit digit of the parallel PCM
digital signal, for example, as shown in FIG. 1 and FIG. As shown, D / A conversion is performed
by generating signals in each drive unit and adding them on a common diaphragm (film) to
reproduce an acoustic signal (analog sound). In the digital speaker of the piezoelectric house
shown in FIG. 1, one flat plate electrode (1) of the pair of flat plate electrodes formed by
interposing the piezoelectric element is used as a common electrode (diaphragm), and the other
flat plate electrode (2) ) Are divided into the electrodes of the surface to give a driving force
proportional to the weight of each bit digit of the parallel PCM signal, and each electrode is
shown as <M S B bit (M maximum) electrode (2a), ( MSB-1) Hift 0) FIL pole (2b), (MSB-2) bit
electrode (2s, (NiSB-3,) Hypanto electrode (2d), (? + 5B-4) bit contact (26) The input (MSB-5) bit
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(LSB bit) electrode (2f) is used. A chair parallel PCM signal is supplied to each electrode, and
when the coefficient of the bit digit is "1", a voltage is applied to the corresponding electrode, and
a driving force corresponding to the weight of the bit digit is generated. Synthesized on electrode
(1)). Further, in the electrodynamic type digital speaker shown in FIG. 2, the voice coil (coils 12a,
12b, 12C,. These coils (12a on (12b), (12G)...) Drive proportionally to the weight of each bit digit
of the parallel PCM signal. The number of turns to give power is limited.
The current supplied to the coil may be made to correspond to the weight of each bit digit
instead of the number of turns of the coil to provide this driving force. The diaphragm ?3) is
vibrated by a driving force proportional to the weight of each bit digit, and is synthesized on the
diaphragm (film). However, in the conventional digital spill force shown in FIG. 1 and FIG. 2,
generally, the drive section in charge of each bit digit for generating the driving force
representing the weight of each bit digit of the parallel PCM signal is identical. Because it was not
a thing, there was an error in the sound pressure frequency characteristic, the phase
characteristic, and the propagation time between each driving force, and it was difficult to make
a correct D / A conversion and hence a correct reproduction. For example, in the case of FIG. 2,
since the number of turns is different, the inductance is different as viewed from the drive
system, and the distance from the drive portion to the diaphragm is different, so the shift of the
propagation time of the drive energy to the diaphragm (13) Distortion occurred, so the correct D
/ A conversion was l1li L. In addition, if the weight of the moving part of the buttocks is
determined, reproduction of the code method (PCM signal different in M-number 9 is
impossible). In addition, the D / A conversion was difficult because the generating part of the
driving force responsible for each bit of the PCM signal is concentrated on a part of the
diaphragm (film). For example, in the case of FIG. 1, as seen from the drive system, the
electrostatic capacitance is different for each drive unit, and the long drive unit is distributed to a
part of the diaphragm yearly (localized). Conversion was difficult. SUMMARY OF THE
INVENTION In view of such conventional problems, the present invention prevents errors in
characteristics (sound pressure frequency characteristics and phase characteristics) between
driving forces corresponding to the weight of each bit of the parallel PCM signal. By doing this, D
/ A conversion can be correctly performed by additive combination of forces on the same
diaphragm, and any PCM signal having a different length system (weight) can be easily changed
in weight according to the system. It is an object of the present invention to provide an easy-tofabricate digital speaker with a simple structure and capable of A / A conversion so that the
audio reproduction quality can be improved. SUMMARY OF THE INVENTION The present
invention comprises an electro-acoustic conversion means for applying a voltage between a pair
of flat plate electrodes to extract sound pressure, one of which is divided into a plurality of unit
electrodes of uniform area, The unit electrodes of the parallel 1) are grouped and coupled in
parallel so as to have an area proportional to the weight of each bit digit of the CM signal, and
can be driven for each bit digit and the unit electrodes that form each group are approximately
The present invention relates to a digital speaker characterized by being uniformly distributed.
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EXAMPLES Examples of the present invention will be described below with reference to the
drawings. FIG. 3 is a plan view of a piezoelectric transducer 1-sensor showing an embodiment of
a digital speaker according to the present invention. In the figure, one flat plate support (21) of
the piezoelectric element (a pair of flat plate electrodes having a fan interposed) is used as a
common electrode (diaphragm), and the other flat plate electrode (22) is eight or so as shown. It
is divided into unit electrodes (22a) of the same area. These unit prices (22a) are grouped and
connected in parallel so that they have an area proportional to the weight of each bit digit of
parallel PCM and [ho number, and unit electrodes (22a, Are distributed radially. For example,
unit electrodes <';' 2a) are collected every 61 pieces to be MSB denominated, or f n u n di n t
(22a) ? 'k every 3 bits or meth (eight 4813-1) bits Assume that every seven unit electrodes
(22a) are combined to form (48B-2) bits. Likewise, the unit electrodes (22a) are selected so as
not to overlap each other, and each digit is stored. Each unit electrode (22a) is driven
independently. However, each electro-mechanical converter (24) of an area proportional to the
weight of the bit digit can be driven by the same drive source as shown in FIG. 4 for each bit
digit. That is, when the pulse input is supplied to the input terminal (11), the electro-mechanical
transducers (2) of the bit digit provided at the output side are respectively driven in parallel. In
FIG. 4, T1 and T2 are transistors, R11 is a resistor, and ten volts. 0 is a power supply. As
described above, according to the parallel PCM signal, the sound pressure frequency
characteristic and the phase characteristic are equal in number and proportional to the weight of
each bit digit, and an electro-mechanical converter having the same driving power is obtained.
Because of parallel driving, there is no characteristic difference between the driving forces.
Therefore, the addition / composition of force is performed on the same sliding plate (2t) so that
D / A conversion can be performed correctly, and it is possible to improve the reproduction
quality of the audio. In addition, since the unit electrodes are uniformly distributed, the drive
force is not unevenly distributed, and the occurrence of distortion in additive synthesis is small.
Even if the PCM signal code system (weight) changes, the number of electro-mechanical
transducers to be driven, that is, the number of unit slits can be freely changed. Can also be
addressed. As mentioned above, although the case of pressure [Ru] is mentioned as an electromechanical converter in the present embodiment, the present invention is not limited to this and
the present invention can be similarly applied to the case of a chamber type.
According to the present invention, parallel PCM (electro-mechanical conversion can be obtained
with equal sound pressure frequency ? characteristics, equal phase characteristics, and the
same driving power by the number proportional to the weight of each bit digit of the parallel
PCM) Simultaneously and independently of each other, there is no characteristic difference
between each driving force (additive synthesis of force for any code type PCM signal on the same
diaphragm (film) By doing this, D / A conversion can be performed correctly, and the
reproduction quality of audio can be improved. In addition, since the driving force of each bit
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column is generated uniformly with respect to the common diaphragm, the driving force is not
unevenly distributed as in the prior art, and distortion occurs when adding and combining on the
diaphragm. Less, and therefore more accurate / A conversion is possible. According to the
present invention, according to the present invention, one electrode of a pair of flat plate
electrodes is subdivided into a large number of units)), and a unit sound generator is prepared
for each unit, and these units ? each bit digit Since the number of units corresponding to the
weight is distributed approximately equally, by changing the grouping of the units, it is possible
to easily apply it to the PCM signal of another code system in which the weight of each digit is
different. . Furthermore, the present invention is easy to manufacture because it is simple
packaging.
[0002]
Brief description of the drawings
[0003]
1 is a simplified plan view of a piezoelectric transducer portion of a conventional digital speaker,
FIG. 2 is a simplified side view of an electrodynamic transducer portion of a conventional digitalspeaker, and FIG. 6 is a digital speaker according to the present invention. FIG. 4 is a circuit
diagram showing an example of a drive circuit of the digital speaker shown in FIG. 6.
In the reference numerals used in the drawings, (2J) иииииииииииииииииииииииииииииииииииииииииииииииииииии ... Electrodes
(22a)... Agent Katsuya Kaname Tokubo Tsuyoshi Yoshihara Sugiura Toshiki (Spontaneous)
Procedure Amendment 1 Sept 1957 or X 18 The President of the Patent Office 1 The display of
the case 1957 UJr application No. 206498 No. 2, name of the invention Digital speaker (, 218)
Sony Corporation 6, the number of inventions increased by correction (1), specification letter 8
page 5 between lines 5 and 6 Insert the following sentence between the month. ?Various
methods can be considered for drawing the lead wire from the unit electrode (22a) of each
electro-mechanical converter (24). For example, a ring shape having each lead portion (32 each
end portion (32a)) of a lead pattern formed of a conductor pattern formed on a flexible substrate
(insulation substrate) GU shown in the lead terminal device of FIG. The parts (33a) and the disclike parts (33b) are applied as shown in FIG. 7 (FIG. 7 is applied to FIG. 6, but the same applies to
FIG. 5; 3) disposed on the flat plate electrode t221 and each end (32a) of each lead wire country
for each lead wire corresponding to each unit with solder or conductor paint (adhesive) etc.)%
pole (22a) It may be made to be connected and lead wires may be drawn out from each unit
electrode (22a). In addition, as shown in FIG. 8, one flat electrode (diaphragm) C2 j J is a lead
wire made of a conductor (each end of 351 is an electrode end portion of each unit electrode (22
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a constituting the flat electrode (221)) Lead with a conductive pattern (311f K formed) by the
appropriate means at the other end of the lead wire for drawing (g) connected to the end of the
diaphragm r2I with conductive paint (adhesive) etc. By connecting 1G33 or flat cable, lead wires
may be drawn from each unit electrode. "(2), opening and closing: page 10, line 15" is a circuit
diagram. ?A schematic diagram showing each side of the lead wire lead-out terminal device
applied to the digital speaker of FIG. 3, and FIG. 7 shows the lead of FIG. Explanatory drawing
showing an example of a lead wire drawing method in the case of drawing a lead wire by
connecting a wire drawing 7 terminal device to the flat plate electrode I2 of FIG. 3, and FIGS. 8
(a) and 8 (b) respectively show FIG. FIG. 12 is a perspective view and a side view showing
another example of the lead wire extraction method applied to the digital speaker of FIG.
To correct. (3) Add drawings Fig. 5, Fig. 6, Fig. 7, Fig. 8 (a) and Fig. 8 as separate sheets.
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