JPS54117660A - Sound volume controller - Google Patents

Sound volume controller

Info

Publication number
JPS54117660A
JPS54117660A JP2488178A JP2488178A JPS54117660A JP S54117660 A JPS54117660 A JP S54117660A JP 2488178 A JP2488178 A JP 2488178A JP 2488178 A JP2488178 A JP 2488178A JP S54117660 A JPS54117660 A JP S54117660A
Authority
JP
Japan
Prior art keywords
circuit
sound
sound volume
time constant
volume control
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
JP2488178A
Other languages
Japanese (ja)
Other versions
JPS6117365B2 (en
Inventor
Toshifumi Yoshida
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP2488178A priority Critical patent/JPS54117660A/en
Publication of JPS54117660A publication Critical patent/JPS54117660A/en
Publication of JPS6117365B2 publication Critical patent/JPS6117365B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/001—Digital control of analog signals

Landscapes

  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To set arbitrarily a sound when volume power is supplied again after the power source of acoustic devices is broken, by providing a simple time constant circuit to the external in the controller which performs the digital control of the sound volume by pulse signals. CONSTITUTION:Sound volume control voltage generator circuit 3 which generates the pulse output to perform sound volume control, D/A converter 4 which converts the pulse output of circuit 3 to a DC voltage, and sound circuit 5 which performs sound volume control by applying the DC voltage of converter 4 and generates sound in speaker 6 are provided. Further, sound volume control operation part 2 which changes the control voltage, which is applied to sound circuit 5, by changing the pulse output of circuit 3 of this constitution is provided, and time constant circuit 1 is connected to operation part 2 and circuit 3. Then, the time constant is changed by the variable resistance which changes the resistance value by the operation of a rotary switch provided in time constant circuit 1, and the output of circuit 3 is cut off only when time constant circuit 1 is operated at a power supply time, the reby making the sound volume of sound circuit 5 into a set value.
JP2488178A 1978-03-03 1978-03-03 Sound volume controller Granted JPS54117660A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2488178A JPS54117660A (en) 1978-03-03 1978-03-03 Sound volume controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2488178A JPS54117660A (en) 1978-03-03 1978-03-03 Sound volume controller

Publications (2)

Publication Number Publication Date
JPS54117660A true JPS54117660A (en) 1979-09-12
JPS6117365B2 JPS6117365B2 (en) 1986-05-07

Family

ID=12150523

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2488178A Granted JPS54117660A (en) 1978-03-03 1978-03-03 Sound volume controller

Country Status (1)

Country Link
JP (1) JPS54117660A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5772618U (en) * 1980-10-22 1982-05-04
JPS57147307A (en) * 1981-03-06 1982-09-11 Matsushita Electric Ind Co Ltd Sound volume controller

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5772618U (en) * 1980-10-22 1982-05-04
JPS641782Y2 (en) * 1980-10-22 1989-01-17
JPS57147307A (en) * 1981-03-06 1982-09-11 Matsushita Electric Ind Co Ltd Sound volume controller
JPH0141080B2 (en) * 1981-03-06 1989-09-01 Matsushita Electric Ind Co Ltd

Also Published As

Publication number Publication date
JPS6117365B2 (en) 1986-05-07

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