JPS55121750A - Compander - Google Patents

Compander

Info

Publication number
JPS55121750A
JPS55121750A JP2960979A JP2960979A JPS55121750A JP S55121750 A JPS55121750 A JP S55121750A JP 2960979 A JP2960979 A JP 2960979A JP 2960979 A JP2960979 A JP 2960979A JP S55121750 A JPS55121750 A JP S55121750A
Authority
JP
Japan
Prior art keywords
logarithm
output
light
compander
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
JP2960979A
Other languages
Japanese (ja)
Inventor
Yuzo Fuse
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.)
Sony Corp
Original Assignee
Sony 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 Sony Corp filed Critical Sony Corp
Priority to JP2960979A priority Critical patent/JPS55121750A/en
Publication of JPS55121750A publication Critical patent/JPS55121750A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G7/00—Volume compression or expansion in amplifiers
    • H03G7/002—Volume compression or expansion in amplifiers in untuned or low-frequency amplifiers, e.g. audio amplifiers
    • H03G7/004—Volume compression or expansion in amplifiers in untuned or low-frequency amplifiers, e.g. audio amplifiers using continuously variable impedance devices

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)

Abstract

PURPOSE:To realize easily the compander featuring the matched characteristics to each other by constituting the compander by using the photo coupler possessing the logarithm property. CONSTITUTION:The light emission quantity is controlled for light emitting element 9 of photo coupler 10 via the output of level detector 8 which is connected to the output of operational amplifier 5, and the light of element 9 is received by photoconductive element 6. Element 6 is used as the negative feedback resistance of amplifier 5. And the logarithm compression is given to the output of amplifier 5 since coupler 10 features the logarithm preperty. Then the level detection is given to the compressed signal through level detector 18, and light emitting element 19 is actuated for photo coupler 20 featuring the logarithm property. The light of element 19 is received by photoconductive element 14. Then element 14 is used for the input resistance of operational amplifier 15 in order to obtain the logarithm-expanded signal at terminal 17.
JP2960979A 1979-03-14 1979-03-14 Compander Pending JPS55121750A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2960979A JPS55121750A (en) 1979-03-14 1979-03-14 Compander

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2960979A JPS55121750A (en) 1979-03-14 1979-03-14 Compander

Publications (1)

Publication Number Publication Date
JPS55121750A true JPS55121750A (en) 1980-09-19

Family

ID=12280798

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2960979A Pending JPS55121750A (en) 1979-03-14 1979-03-14 Compander

Country Status (1)

Country Link
JP (1) JPS55121750A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07307633A (en) * 1980-03-31 1995-11-21 Hewlett Packard Co <Hp> Signal attenuator
EP2602933A3 (en) * 2011-12-08 2015-03-25 Kabushiki Kaisha Audio-Technica Analog signal transfer system, variable compressor and variable expander

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07307633A (en) * 1980-03-31 1995-11-21 Hewlett Packard Co <Hp> Signal attenuator
EP2602933A3 (en) * 2011-12-08 2015-03-25 Kabushiki Kaisha Audio-Technica Analog signal transfer system, variable compressor and variable expander
US9398371B2 (en) 2011-12-08 2016-07-19 Kabushiki Kaisha Audio-Technica Analog signal transfer system, variable compressor, and variable expander

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