JPS5469005A - Automatic gain adjusting circuit - Google Patents

Automatic gain adjusting circuit

Info

Publication number
JPS5469005A
JPS5469005A JP13588777A JP13588777A JPS5469005A JP S5469005 A JPS5469005 A JP S5469005A JP 13588777 A JP13588777 A JP 13588777A JP 13588777 A JP13588777 A JP 13588777A JP S5469005 A JPS5469005 A JP S5469005A
Authority
JP
Japan
Prior art keywords
circuit
type variable
deviation
variable gain
pilot 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
JP13588777A
Other languages
Japanese (ja)
Inventor
Toshio Hasegawa
Takuya Iwagami
Takeshi Sawai
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP13588777A priority Critical patent/JPS5469005A/en
Publication of JPS5469005A publication Critical patent/JPS5469005A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/04—Control of transmission; Equalising
    • H04B3/10—Control of transmission; Equalising by pilot signal

Abstract

PURPOSE:To enhance the equalization accuracy for the transmission system in which the equivalent transmission frequency is different from the frequency of the pilot signal by absorbing the residual gain deviation by means of the flat-type variable gain circuit. CONSTITUTION:The pilot signal which is piled on the PCM signal received the waveform distortion at input point 1 is extracted after passing through obliquie- type variable gain circuit 2 and then supplied to control circuit 4, and the output of circuit 4 controls so that the pilot signal level may be constant for circuit 2. Then the deviation derived from the prescribed signal level based on the residual equalization deviation of the circuit 2 output is supplied to flat-type variable gain equalizer 6 to be thus controlled by the peak or average value detection control circuit 7. As a result, the PCM signal of the prescribed amplitude value is obtained at output terminal 8.
JP13588777A 1977-11-11 1977-11-11 Automatic gain adjusting circuit Pending JPS5469005A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13588777A JPS5469005A (en) 1977-11-11 1977-11-11 Automatic gain adjusting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13588777A JPS5469005A (en) 1977-11-11 1977-11-11 Automatic gain adjusting circuit

Publications (1)

Publication Number Publication Date
JPS5469005A true JPS5469005A (en) 1979-06-02

Family

ID=15162102

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13588777A Pending JPS5469005A (en) 1977-11-11 1977-11-11 Automatic gain adjusting circuit

Country Status (1)

Country Link
JP (1) JPS5469005A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0163482A2 (en) * 1984-05-24 1985-12-04 Nec Corporation Equalizer for frequency independent and dependent transmission loss components with a pilot used for the frequency independent component

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0163482A2 (en) * 1984-05-24 1985-12-04 Nec Corporation Equalizer for frequency independent and dependent transmission loss components with a pilot used for the frequency independent component

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