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・へ。 June 24, 1977, Secretary General of the Patent Office Hideo Saito 1 · Name of Invention V
′ ′ Lij 渓 住所 京都 東 京都 丁 丁 丁 丁 丁 丁 丁 丁 808 808 住所 Address Setagaya 6 原 6 18
No. 11 18 Nishiwaki Jin-(other 2 people) 4, agent 〒 104 [phase] Japan Patent Office ■ JP-A-5224010 published Japanese Patent 52. (1977) 1, 10 1 50 50-'16 FE 2 Z [phase] Application date
n (197 t) l, L% 6 '76' l 23 specification 1, title of the invention Dragon-Regeneration method 1,
Invention Name Dragon-How to play
2, inventor
3 、 Detailed Description of the Invention 本 llllll 音響 音響 音響 1 1 1 1 音響 音響 音響 音響 音
響 音響 音響 提供 提供 提供 提供 提供 提供 提供 提供 提供 提供 提供 提供 提供 提供 提供 提供 提
供 提供 提供 提供 提供The The conventional sound reproduction method has been to reproduce
an analog electroacoustic conversion system (a speaker, an earphone or the like, an analog
electric signal such as a speaker, an earphone, etc.) performing an analog operation to reproduce
an analog sound d 'power. However, such an analog electro-acoustic conversion system has a
drawback that it generates a so-called linear distortion such as a resonance phenomenon or a
transient vibration caused by the non-uniform frequency characteristic of the transfer function of
the electro-acoustic conversion system. There has been a drawback that it generates non-linear
distortion such as harmonic distortion and overload resulting from non-linearity of the input
characteristic of the system. The present invention is an audio reproduction method based on a
new principle without such a drawback. The method of the present invention does not use an
analog electroacoustic transducer that performs analog operation, and inputs a binary digital
electrical signal C equivalent (including an analog electrical signal or multivalued digital electrical
signal that can be considered as a binary value). To provide a binary digital electroacoustic
transducer that generates a binary digital acoustic output, and a plurality of binary digital
acoustic outputs obtained with a time difference from the binary digital electric sound tube
transducer are separated by tone It synthesizes and reproduces an analog sound output. Next, a
first embodiment of the present invention using a PWM (Pu1se Width Modulation, pulse
EndPage: 1 width modulation) signal will be described with reference to FIGS. As shown in FIG. 1,
by inputting one analog electric signal and two input to the C2 PWM modulator 1, the PWM
binary digital aerobic signal 3 is input to the binary digital analog acoustic transducer 41,
thereby providing a PWM 'binary signal. Digital note output 5 is obtained. It is possible to cut the
high-pass through the filter 6 through the filter 6 (by obtaining the analog sound output 19 with
the eye σ: more than 2). Note that since human hearing has a high frequency cutoff
characteristic, the above filter 6 can be omitted. -Here, the PWM binary digital electric signal is
an electric signal obtained by reproducing the recording by the known PWM recording method,
and the bandwidth of the signal to be reproduced is 0-fH2 as shown in FIG. , An electrical signal
8 (FIG. 2 all 2 superimposed signal 9 (a second sawtooth signal n obtained by cutting the second
Flc at a constant level 10 (FIG. 2)) d).
This signal 11 is considered to be composed of an analog signal 8 and a high-rise one wave
signal. FIG. 3 exemplifies the principle of the mechanism for converting the above-mentioned
PWM Z value digital signal into sound, and by opening and closing the solenoid valve 14
provided in the discharge pipe 13 of the air pressure vessel 12 according to the signal 11, the
PWM binary value Digital electrical signals can be converted to sound. In practice, with such a
mechanical solenoid valve, it is difficult to quickly open and close, but it is considered effective to
obtain a momentary high pressure by corona discharge7. FIGS. 4 to 5 show a second
embodiment of the present invention for driving a Z.DELTA.2 .xi. Digital electro-acoustic
transducer by .SIGMA. (Integral constant difference modulation) signal according to a known
recording system. The analog electric signal 2 enters the ΔΔ modulator 15, and the ΔΔ binary
digital noise signal 16 output from the modulator 15 becomes the ΔΔ binary digital sound cost
output 18 by the binary digital electric sound cost converter 17, and the filter 6 The minutes are
removed to provide an analog sound output 19. Also in this case, the filter 6 can be omitted as in
the previous example. The Z.DELTA. Binary digital signal 16 is obtained by integrator C adding
an analog electric signal as shown in FIG. 5 and passing it through a constant difference
modulator 21 C :. 73) 7 Although the PWM signal and Z Δ-double signal known as an example
of the binary digital electric signal in the above-mentioned embodiment are known, they are
conventionally converted into -1 reference "analog electric signal". It was not possible to avoid
the intervention of each frame because it was to demodulate and to drive the analog
electroacoustic transducer by this. Since the digital operation of the -OFF binary value is
performed, the linear distortion generated by the electro-acoustic transducer can be suppressed
by transferring the electro-acoustic transducer to the non-linear region to operate. Also, even if
the electroacoustic transducer is transferred to a non-linear region and operated, no non-linear
distortion occurs. Further, miniaturization, large output, improvement of directivity, reduction of
living costs, etc. can be expected, and the industrial effect is large.
4. Brief description of the drawings shows an embodiment of the present invention, FIG. 1 is a
diagram showing a first example driven by a PWM signal, FIG. 2 is a diagram explaining the pwM
signal, FIG. 3 FIG. 4 is a diagram schematically showing an electro-acoustic transducer, FIG. 4 is a
diagram showing a second example of ΣZ-fold signal driving, and FIG. 5 is a diagram showing an
apparatus for producing a ZΔ-fold signal. 1: PWM modulator, 2: analog analog signal, 3: P-WM
binary digital signal, 4: binary digital electroacoustic transducer, 5: PWM Z digital audio output,
6: filter, 12: Pneumatic pressure vessel, 14: Solenoid valve, 15: ZΔ modulator, 16: ΔΔ binary
electric signal, 17: binary digital electric sound transducer, 18: ΔΔ binary digital sound output,
19: analog sound output , 20: integrator, 21: constant difference modulator. Patent assignee
Nishiwaki Jin-Hatori Mitsutoshi EndPage: 21 (1) b "1 1 1 Fig. 2 Fig. 4 葛 5 Fig. 6, inventor, patent
applicant (1) inventor (2) patent application People Tokyo ψ 5 + g ¥ 丁 1-chome 6 No. 24 5 os
W Mitsutoshi Hatori EndPage: 3
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