JPS5535539A - Variable gain control unit - Google Patents

Variable gain control unit

Info

Publication number
JPS5535539A
JPS5535539A JP10864878A JP10864878A JPS5535539A JP S5535539 A JPS5535539 A JP S5535539A JP 10864878 A JP10864878 A JP 10864878A JP 10864878 A JP10864878 A JP 10864878A JP S5535539 A JPS5535539 A JP S5535539A
Authority
JP
Japan
Prior art keywords
voltage
terminal
oscillator
level
circuit
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
JP10864878A
Other languages
Japanese (ja)
Inventor
Toshifumi Shibuya
Yoshimori Muraki
Yoshimi Iso
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP10864878A priority Critical patent/JPS5535539A/en
Priority to DE19792935306 priority patent/DE2935306A1/en
Publication of JPS5535539A publication Critical patent/JPS5535539A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G1/00—Details of arrangements for controlling amplification
    • H03G1/0005—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal
    • H03G1/0088—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using discontinuously variable devices, e.g. switch-operated
    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/24—Frequency- independent attenuators

Landscapes

  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE: To improve an operational efficiency by setting frequencies of input signals to values different in change speed of sound volume for respective parts of an operation part connected to a control circuit, in the electronic controlled variable gain unit which changes the ratio of resistance division by controlling a switching circuit.
CONSTITUTION: Oscillator 40 outputs the pulse voltage of oscillation frequency f1 to output terminal 42 by applying the voltage of level "1" to input terminal 41. Oscillator 26 outputs the pulse voltage of oscillation frequency f2 to terminal 37 by applying the voltage of level "1" to terminal 37 and connects this pulse voltage to input terminal 35 of up/down counter circuit 25 through terminal 42 of oscillator 40 and OR circuit 27. When switch 33 is depressed, the voltage of level "1" is applied to terminals 39 and 41, and counter circuit 25 becomes a counting-up mode and counts up with frequency f1 of oscillator 40; and when switch 32 is depressed, the voltage of level "1" is applied to terminals 38 and 37 to count down with f2.
COPYRIGHT: (C)1980,JPO&Japio
JP10864878A 1978-09-06 1978-09-06 Variable gain control unit Pending JPS5535539A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP10864878A JPS5535539A (en) 1978-09-06 1978-09-06 Variable gain control unit
DE19792935306 DE2935306A1 (en) 1978-09-06 1979-08-31 Remote gain control circuit for radio and TV - reduces volume faster than it increases volume by use of up=down counter using different frequencies

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10864878A JPS5535539A (en) 1978-09-06 1978-09-06 Variable gain control unit

Publications (1)

Publication Number Publication Date
JPS5535539A true JPS5535539A (en) 1980-03-12

Family

ID=14490125

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10864878A Pending JPS5535539A (en) 1978-09-06 1978-09-06 Variable gain control unit

Country Status (2)

Country Link
JP (1) JPS5535539A (en)
DE (1) DE2935306A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6250534A (en) * 1985-08-28 1987-03-05 愛知電機株式会社 Temperature display apparatus of sanitary washing apparatus
JPH0477645U (en) * 1990-11-09 1992-07-07

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56119516A (en) * 1980-02-25 1981-09-19 Sharp Corp Digital control system sound volume adjusting device
FR2544519B1 (en) * 1983-04-15 1985-06-14 Thomson Csf DIFFERENTIAL MANUAL CONTROL DEVICE
DE3334109A1 (en) * 1983-09-21 1985-04-04 Siemens AG, 1000 Berlin und 8000 München Arrangement for level control of sine-wave voltages generated in a line simulation device of a telephone system, in particular a telephone PABX system
DE4434229A1 (en) * 1994-06-07 1995-12-14 Manfred Baier Discontinuous level setter with longitudinal and transverse resistances

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4945612A (en) * 1972-09-04 1974-05-01

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4945612A (en) * 1972-09-04 1974-05-01

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6250534A (en) * 1985-08-28 1987-03-05 愛知電機株式会社 Temperature display apparatus of sanitary washing apparatus
JPH0625433B2 (en) * 1985-08-28 1994-04-06 愛知電機株式会社 Sanitary washing device temperature display
JPH0477645U (en) * 1990-11-09 1992-07-07

Also Published As

Publication number Publication date
DE2935306A1 (en) 1980-04-03

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