JPS555589A - Audio amplifying circuit - Google Patents

Audio amplifying circuit

Info

Publication number
JPS555589A
JPS555589A JP7962878A JP7962878A JPS555589A JP S555589 A JPS555589 A JP S555589A JP 7962878 A JP7962878 A JP 7962878A JP 7962878 A JP7962878 A JP 7962878A JP S555589 A JPS555589 A JP S555589A
Authority
JP
Japan
Prior art keywords
signal
performance
frequency
input signal
discrimination 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
JP7962878A
Other languages
Japanese (ja)
Inventor
Shinji Seto
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
Original Assignee
Mitsubishi Electric Corp
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 filed Critical Mitsubishi Electric Corp
Priority to JP7962878A priority Critical patent/JPS555589A/en
Publication of JPS555589A publication Critical patent/JPS555589A/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

Landscapes

  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)

Abstract

PURPOSE:To produce the audio with fidelity, by controlling the frequency performance of amplifier depending on S/N of the input signal. CONSTITUTION:While the S/N of input signal exceeds a given threshold value, the S/N discrimination circuit 4 outputs the signal of logic ''0'', the performance of the frequency performance control circuit 3 is flat, and the signal at the input terminal 1 is outputted at the output terminal 5 with amplification with fidelity. If the S/N is lowered below the said threshold value, the S/N discrimination circuit 4 outputs the signal of logic ''1'', the frequency performance control circuit 3 is changed for the connection to the performance emphasizing the higher frequency component to avoid the lowering in the clearness of the audio signal at the output terminal 5. As the S/N discrimination circuit 4, the amount of noise included in the frequency band other than that in 0.3 to 3 KHz among the input signal is detected and it is discriminated for the S/N.
JP7962878A 1978-06-29 1978-06-29 Audio amplifying circuit Pending JPS555589A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7962878A JPS555589A (en) 1978-06-29 1978-06-29 Audio amplifying circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7962878A JPS555589A (en) 1978-06-29 1978-06-29 Audio amplifying circuit

Publications (1)

Publication Number Publication Date
JPS555589A true JPS555589A (en) 1980-01-16

Family

ID=13695333

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7962878A Pending JPS555589A (en) 1978-06-29 1978-06-29 Audio amplifying circuit

Country Status (1)

Country Link
JP (1) JPS555589A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57194258A (en) * 1981-05-09 1982-11-29 Hooker Chemicals Plastics Corp Treatment of metal phosphate coat

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57194258A (en) * 1981-05-09 1982-11-29 Hooker Chemicals Plastics Corp Treatment of metal phosphate coat

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