JPS57104310A - Sound circuit - Google Patents

Sound circuit

Info

Publication number
JPS57104310A
JPS57104310A JP18021880A JP18021880A JPS57104310A JP S57104310 A JPS57104310 A JP S57104310A JP 18021880 A JP18021880 A JP 18021880A JP 18021880 A JP18021880 A JP 18021880A JP S57104310 A JPS57104310 A JP S57104310A
Authority
JP
Japan
Prior art keywords
output
value
latch circuit
comparator
outputs
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.)
Pending
Application number
JP18021880A
Other languages
Japanese (ja)
Inventor
Kazuhiro Kamemoto
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP18021880A priority Critical patent/JPS57104310A/en
Publication of JPS57104310A publication Critical patent/JPS57104310A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers

Landscapes

  • Control Of Amplification And Gain Control (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

PURPOSE:To improve the critical characteristic, by providing a means for generating a PWM code, which has the duty ratio changed nonlinearly for sound volume control data, to set an attenuation quantity. CONSTITUTION:A value A (0<=A<=n-1) is set to an up/down counter 29 by up/down count signals Su and Sd which control the output level of a sound signal. An (n+m)-notation counter 26 counts output pulses of a pulse generator 25; and when the count value exceeds the 1's complement of the value A, a comparator 27 outputs the set output to a latch circuit 28; and otherwise, the comparator 27 outputs the reset output. When the value A of the couter 29 is 0, the reset output is always supplied to the latch circuit 28. The duty ratio of output pulses of the latch circuit 28 is 0 for A=0 and is (m+A)/(n+m) for Anot equal to 0. This output is supplied to an attenuator through a low-pass filter.
JP18021880A 1980-12-19 1980-12-19 Sound circuit Pending JPS57104310A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18021880A JPS57104310A (en) 1980-12-19 1980-12-19 Sound circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18021880A JPS57104310A (en) 1980-12-19 1980-12-19 Sound circuit

Publications (1)

Publication Number Publication Date
JPS57104310A true JPS57104310A (en) 1982-06-29

Family

ID=16079462

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18021880A Pending JPS57104310A (en) 1980-12-19 1980-12-19 Sound circuit

Country Status (1)

Country Link
JP (1) JPS57104310A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60177711A (en) * 1984-02-10 1985-09-11 プレシジヨン・モノリシツクス・インコ−ポレ−テツド Digital control amplifier
EP1881602A1 (en) * 2006-07-17 2008-01-23 Vestel Elektronik Sanayi ve Ticaret A.S. Method and circuit for audio output muting

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60177711A (en) * 1984-02-10 1985-09-11 プレシジヨン・モノリシツクス・インコ−ポレ−テツド Digital control amplifier
EP1881602A1 (en) * 2006-07-17 2008-01-23 Vestel Elektronik Sanayi ve Ticaret A.S. Method and circuit for audio output muting

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