JPS56132020A - Pulse width modulating circuit - Google Patents

Pulse width modulating circuit

Info

Publication number
JPS56132020A
JPS56132020A JP3399980A JP3399980A JPS56132020A JP S56132020 A JPS56132020 A JP S56132020A JP 3399980 A JP3399980 A JP 3399980A JP 3399980 A JP3399980 A JP 3399980A JP S56132020 A JPS56132020 A JP S56132020A
Authority
JP
Japan
Prior art keywords
voltage
signal
triangular wave
pulse width
comparator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP3399980A
Other languages
Japanese (ja)
Other versions
JPH0136286B2 (en
Inventor
Yoshiro Kunugi
Akio Tokuge
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pioneer Corp
Original Assignee
Pioneer Electronic Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pioneer Electronic Corp filed Critical Pioneer Electronic Corp
Priority to JP3399980A priority Critical patent/JPS56132020A/en
Publication of JPS56132020A publication Critical patent/JPS56132020A/en
Publication of JPH0136286B2 publication Critical patent/JPH0136286B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K7/00—Modulating pulses with a continuously-variable modulating signal
    • H03K7/08—Duration or width modulation ; Duty cycle modulation

Landscapes

  • Amplifiers (AREA)

Abstract

PURPOSE:To make the comparator, to which the triangular wave output and the sound signal are applied in the conventional circuit, needless to simplify the circuit constitution, by applying the sound signal into the triangular wave signal oscillating circuit and by shifting the level of the triangular wave signal to shape its waveform into a rectangular wave. CONSTITUTION:When sound signal (b) does not exist and the output voltage of sound amplifier 3 is zero volt, input voltage Vs of the noninversion terminal of comparator 8 has threshold voltages VS1=+VCCXR3/(R3+R4) and VS2=-VccX R3/(R3+R4), and capacitor C2 repeats charging and discharing with these voltages as the reference, and voltage VA of capacitor C2 becomes a triangular wave signal. This voltage VA has the waveform shaped by high-gain amplifier 11 and becomes pulse width modulation signal VO of duty 50%. Meanwhile, when sound signal (b) appears and its voltage is +Vb, voltage VS of the noninversion terminal of comparator 8 rises by +Vb, and triangular wave voltage VA is shifted as a whole by +Vb, and this voltage has the waveform shaped to obtain pulse width-modulated signal V0.
JP3399980A 1980-03-19 1980-03-19 Pulse width modulating circuit Granted JPS56132020A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3399980A JPS56132020A (en) 1980-03-19 1980-03-19 Pulse width modulating circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3399980A JPS56132020A (en) 1980-03-19 1980-03-19 Pulse width modulating circuit

Publications (2)

Publication Number Publication Date
JPS56132020A true JPS56132020A (en) 1981-10-16
JPH0136286B2 JPH0136286B2 (en) 1989-07-31

Family

ID=12402152

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3399980A Granted JPS56132020A (en) 1980-03-19 1980-03-19 Pulse width modulating circuit

Country Status (1)

Country Link
JP (1) JPS56132020A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61256825A (en) * 1985-05-09 1986-11-14 Matsushita Electric Ind Co Ltd Pwm digital-analog converter
JPS61264920A (en) * 1985-05-20 1986-11-22 Matsushita Electric Ind Co Ltd Digital-analog converter

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5245248A (en) * 1975-10-07 1977-04-09 Yaskawa Electric Mfg Co Ltd Pre-amplifier

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5245248A (en) * 1975-10-07 1977-04-09 Yaskawa Electric Mfg Co Ltd Pre-amplifier

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61256825A (en) * 1985-05-09 1986-11-14 Matsushita Electric Ind Co Ltd Pwm digital-analog converter
JPS61264920A (en) * 1985-05-20 1986-11-22 Matsushita Electric Ind Co Ltd Digital-analog converter

Also Published As

Publication number Publication date
JPH0136286B2 (en) 1989-07-31

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