JPS5775014A - Correcting device for sound volume of electronic apparatus - Google Patents

Correcting device for sound volume of electronic apparatus

Info

Publication number
JPS5775014A
JPS5775014A JP15170880A JP15170880A JPS5775014A JP S5775014 A JPS5775014 A JP S5775014A JP 15170880 A JP15170880 A JP 15170880A JP 15170880 A JP15170880 A JP 15170880A JP S5775014 A JPS5775014 A JP S5775014A
Authority
JP
Japan
Prior art keywords
signal
band
fetq1
frequency components
control signal
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
JP15170880A
Other languages
Japanese (ja)
Inventor
Teruo Ichikawa
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.)
Minolta Co Ltd
Original Assignee
Minolta 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 Minolta Co Ltd filed Critical Minolta Co Ltd
Priority to JP15170880A priority Critical patent/JPS5775014A/en
Publication of JPS5775014A publication Critical patent/JPS5775014A/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
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/32—Automatic control in amplifiers having semiconductor devices the control being dependent upon ambient noise level or sound level

Landscapes

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

Abstract

PURPOSE:To improve the degree of voice recognition, by extracting a signal having frequency components other than the sound band from the noise changing the frequency characteristics and the amplification factor of an electronic apparatus in accordance with the level of this signal. CONSTITUTION:Frequency components at the outside of the sound band are extracted from a signal, which is obtained from a microphone, by a band-stop filter. This signal is amplified and is rectified to obtain a control signal Vc. Meanwhile, the signal from the microphone is inputted to an ampplifier OA through a resistance R1 and a band-pass filter 28. The band-pass filter 28 consists of a resonance circuit and an FETQ1 operated as a variable resistor. When the noise is high, such control signal is given to the FETQ1 that the resistance of the FETQ1 becomes high; and as a result, the Q value of the resonator is raised, and the effect of elimination of frequency components at the outside of the sound band is enhanced. The control signal varies the gain of the amplifier OA to prevent the fluctuation of the output even for the change of the Q value.
JP15170880A 1980-10-28 1980-10-28 Correcting device for sound volume of electronic apparatus Pending JPS5775014A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15170880A JPS5775014A (en) 1980-10-28 1980-10-28 Correcting device for sound volume of electronic apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15170880A JPS5775014A (en) 1980-10-28 1980-10-28 Correcting device for sound volume of electronic apparatus

Publications (1)

Publication Number Publication Date
JPS5775014A true JPS5775014A (en) 1982-05-11

Family

ID=15524526

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15170880A Pending JPS5775014A (en) 1980-10-28 1980-10-28 Correcting device for sound volume of electronic apparatus

Country Status (1)

Country Link
JP (1) JPS5775014A (en)

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