JPS58159008A - Sound recording and amplifying circuit - Google Patents

Sound recording and amplifying circuit

Info

Publication number
JPS58159008A
JPS58159008A JP4107982A JP4107982A JPS58159008A JP S58159008 A JPS58159008 A JP S58159008A JP 4107982 A JP4107982 A JP 4107982A JP 4107982 A JP4107982 A JP 4107982A JP S58159008 A JPS58159008 A JP S58159008A
Authority
JP
Japan
Prior art keywords
impedance element
variable impedance
input signal
voltage
amplifier
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
JP4107982A
Other languages
Japanese (ja)
Inventor
Shigeru Nakajima
Makoto Fukuyama
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.)
Mitsubishi Electric Corp
Panasonic Holdings Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp, Matsushita Electric Industrial Co Ltd filed Critical Mitsubishi Electric Corp
Priority to JP4107982A priority Critical patent/JPS58159008A/en
Publication of JPS58159008A publication Critical patent/JPS58159008A/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 without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers

Abstract

PURPOSE:To prevent an abnormal operation in the event of an excessive input signal, by limiting a driving current applied to a variable impedance element in an ALC circuit. CONSTITUTION:A signal inputted to a terminal 1 is inputted to an amplifier A through a variable impedance element E. The amplifier A amplifies the input signal by specified gain, and outputs it from a terminal 5. In case the input signal is large, the variable impedance element E is controlled in accordance with magnitude of voltage of a portion which exceeds reference voltage, so that the input signal becomes small. Voltage for controlling the variable impedance element E is limited before the variable impedance element E is saturated. In this way, it is prevented that the output signal is distorted, by preventing that the variable impedance element E is driven excessively.
JP4107982A 1982-03-16 1982-03-16 Sound recording and amplifying circuit Pending JPS58159008A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4107982A JPS58159008A (en) 1982-03-16 1982-03-16 Sound recording and amplifying circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4107982A JPS58159008A (en) 1982-03-16 1982-03-16 Sound recording and amplifying circuit

Publications (1)

Publication Number Publication Date
JPS58159008A true JPS58159008A (en) 1983-09-21

Family

ID=12598451

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4107982A Pending JPS58159008A (en) 1982-03-16 1982-03-16 Sound recording and amplifying circuit

Country Status (1)

Country Link
JP (1) JPS58159008A (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5148246A (en) * 1974-10-23 1976-04-24 Matsushita Electric Ind Co Ltd RITOKUSEIGYOKIRIKAESOCHI
JPS5622202A (en) * 1979-07-31 1981-03-02 Pioneer Electronic Corp Sound recording level controller
JPS5634210A (en) * 1979-08-29 1981-04-06 Sony Corp Agc circuit
JPS5711514A (en) * 1980-06-24 1982-01-21 Olympus Optical Co Ltd Automatic level controller

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5148246A (en) * 1974-10-23 1976-04-24 Matsushita Electric Ind Co Ltd RITOKUSEIGYOKIRIKAESOCHI
JPS5622202A (en) * 1979-07-31 1981-03-02 Pioneer Electronic Corp Sound recording level controller
JPS5634210A (en) * 1979-08-29 1981-04-06 Sony Corp Agc circuit
JPS5711514A (en) * 1980-06-24 1982-01-21 Olympus Optical Co Ltd Automatic level controller

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