JPS57121330A - Noise reduction device - Google Patents

Noise reduction device

Info

Publication number
JPS57121330A
JPS57121330A JP709781A JP709781A JPS57121330A JP S57121330 A JPS57121330 A JP S57121330A JP 709781 A JP709781 A JP 709781A JP 709781 A JP709781 A JP 709781A JP S57121330 A JPS57121330 A JP S57121330A
Authority
JP
Japan
Prior art keywords
electronic switch
amplifiers
pass filters
variable high
terminal
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.)
Granted
Application number
JP709781A
Other languages
Japanese (ja)
Other versions
JPS6316930B2 (en
Inventor
Kenzo Akagiri
Masayuki Katakura
Motomi Okochi
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 JP709781A priority Critical patent/JPS57121330A/en
Publication of JPS57121330A publication Critical patent/JPS57121330A/en
Publication of JPS6316930B2 publication Critical patent/JPS6316930B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/62—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for providing a predistortion of the signal in the transmitter and corresponding correction in the receiver, e.g. for improving the signal/noise ratio
    • H04B1/64—Volume compression or expansion arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)

Abstract

PURPOSE:To switch inputs and modes electronically, by using an electronic switch amplifier which has two pairs of noninversion and inversion input terminals and operates selectively either of input terminal pair. CONSTITUTION:Noise reduction circuits 11a and 11b have electronic switch amplifiers 12a and 12b and variable high-pass filters 13a and 13b, respectively, and variable high-pass filters 13a and 13b are different from each other in operation input level or operation frequency range. In respect to electronic switch amplifiers 12a and 12b, the common emitter of two differential amplifiers is grounded through differentially connected transistors, and either of differential amplifier is selected by a control signal applied to a terminal T. A control signal is applied from a terminal 15 to control selectively whether variable high-pass filters 13a and 13b should be inserted and connected to negative return circuits of electronic switch amplifiers 12a and 12b.
JP709781A 1981-01-20 1981-01-20 Noise reduction device Granted JPS57121330A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP709781A JPS57121330A (en) 1981-01-20 1981-01-20 Noise reduction device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP709781A JPS57121330A (en) 1981-01-20 1981-01-20 Noise reduction device

Publications (2)

Publication Number Publication Date
JPS57121330A true JPS57121330A (en) 1982-07-28
JPS6316930B2 JPS6316930B2 (en) 1988-04-12

Family

ID=11656569

Family Applications (1)

Application Number Title Priority Date Filing Date
JP709781A Granted JPS57121330A (en) 1981-01-20 1981-01-20 Noise reduction device

Country Status (1)

Country Link
JP (1) JPS57121330A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2635424A1 (en) * 1988-07-29 1990-02-16 Toshiba Kk MODULATOR AND TRANSMITTER

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2635424A1 (en) * 1988-07-29 1990-02-16 Toshiba Kk MODULATOR AND TRANSMITTER

Also Published As

Publication number Publication date
JPS6316930B2 (en) 1988-04-12

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