JPS56154837A - Pilot level detecting circuit - Google Patents

Pilot level detecting circuit

Info

Publication number
JPS56154837A
JPS56154837A JP5760580A JP5760580A JPS56154837A JP S56154837 A JPS56154837 A JP S56154837A JP 5760580 A JP5760580 A JP 5760580A JP 5760580 A JP5760580 A JP 5760580A JP S56154837 A JPS56154837 A JP S56154837A
Authority
JP
Japan
Prior art keywords
output
angular frequency
frequency
voltage
pilot level
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
JP5760580A
Other languages
Japanese (ja)
Inventor
Kiyoshi Minematsu
Shinichi Tsuchida
Hayashi Suzuki
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP5760580A priority Critical patent/JPS56154837A/en
Publication of JPS56154837A publication Critical patent/JPS56154837A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

PURPOSE:To detect a pilot level accurately at any time by varying the frequency of a carrier supplying source and the passing band of BPF in conjunction with each other. CONSTITUTION:As the output of demodulator 1 increases to high angular frequency omega2 in the passing band of BPF3 when an input signal has low angular frequency ps, the output voltage of level detector 6 drops and the plus input of the amplifier of phase detector 7 has a higher voltage than the minus input to generate output ''0'', inverting the polarity of the output of signal generator 9. The output voltage of integrator 8 varies in the opposite direction and when the output frequency of voltage-controlled oscillator 5 is denoted as c1, angular frequency c1-ps decreases to approximate to center angular frequency omega0. When the input signal has high angular frequency p1, control is exercised similarly to maximize the output of detector 6, detecting a pilot level accurately all the time.
JP5760580A 1980-04-30 1980-04-30 Pilot level detecting circuit Pending JPS56154837A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5760580A JPS56154837A (en) 1980-04-30 1980-04-30 Pilot level detecting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5760580A JPS56154837A (en) 1980-04-30 1980-04-30 Pilot level detecting circuit

Publications (1)

Publication Number Publication Date
JPS56154837A true JPS56154837A (en) 1981-11-30

Family

ID=13060484

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5760580A Pending JPS56154837A (en) 1980-04-30 1980-04-30 Pilot level detecting circuit

Country Status (1)

Country Link
JP (1) JPS56154837A (en)

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