JPS56103511A - Monolithic semiconductor integrated circuit - Google Patents

Monolithic semiconductor integrated circuit

Info

Publication number
JPS56103511A
JPS56103511A JP570780A JP570780A JPS56103511A JP S56103511 A JPS56103511 A JP S56103511A JP 570780 A JP570780 A JP 570780A JP 570780 A JP570780 A JP 570780A JP S56103511 A JPS56103511 A JP S56103511A
Authority
JP
Japan
Prior art keywords
circuit
supplied
output
pass filter
monolithic semiconductor
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
JP570780A
Other languages
Japanese (ja)
Inventor
Yasuo Kominami
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 JP570780A priority Critical patent/JPS56103511A/en
Publication of JPS56103511A publication Critical patent/JPS56103511A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G5/00—Tone control or bandwidth control in amplifiers
    • H03G5/16—Automatic control
    • H03G5/18—Automatic control in untuned amplifiers

Landscapes

  • Control Of Amplification And Gain Control (AREA)
  • Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)

Abstract

PURPOSE:To decrease the number of external terminals, by supplying the analog and digital control input signals through a common input terminal for a monolithic semiconductor IC containing both control input signals. CONSTITUTION:The reproduced signal is supplied to the amplifying circuit 1, and this output is supplied to the variable low-pass filter 2. The output of the filter 2 is applied to a muting circuit consisting of the resistance R1 and transistor Q. The control signal of the muting circuit is produced at the voltage detecting circuit 3. In addition, the output of the circuit 1 is supplied to the high-pass filter 4 to erase the high-range noise such as the hiss noise or the like. Thus the high-range component is extracted and then converted into an analog voltage signal by the wave detecting circuit 5 to vary high-range cut-off frequency of a variable low-pass filter.
JP570780A 1980-01-23 1980-01-23 Monolithic semiconductor integrated circuit Pending JPS56103511A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP570780A JPS56103511A (en) 1980-01-23 1980-01-23 Monolithic semiconductor integrated circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP570780A JPS56103511A (en) 1980-01-23 1980-01-23 Monolithic semiconductor integrated circuit

Publications (1)

Publication Number Publication Date
JPS56103511A true JPS56103511A (en) 1981-08-18

Family

ID=11618579

Family Applications (1)

Application Number Title Priority Date Filing Date
JP570780A Pending JPS56103511A (en) 1980-01-23 1980-01-23 Monolithic semiconductor integrated circuit

Country Status (1)

Country Link
JP (1) JPS56103511A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09305908A (en) * 1996-05-09 1997-11-28 Pioneer Electron Corp Noise-reducing apparatus
JPH1145404A (en) * 1997-07-29 1999-02-16 Pioneer Electron Corp Noise reducing device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5535584A (en) * 1978-09-06 1980-03-12 Matsushita Electric Ind Co Ltd Sound volume controller

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5535584A (en) * 1978-09-06 1980-03-12 Matsushita Electric Ind Co Ltd Sound volume controller

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09305908A (en) * 1996-05-09 1997-11-28 Pioneer Electron Corp Noise-reducing apparatus
JPH1145404A (en) * 1997-07-29 1999-02-16 Pioneer Electron Corp Noise reducing device

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