JPS5679584A - Signal discrimination circuit - Google Patents

Signal discrimination circuit

Info

Publication number
JPS5679584A
JPS5679584A JP15616079A JP15616079A JPS5679584A JP S5679584 A JPS5679584 A JP S5679584A JP 15616079 A JP15616079 A JP 15616079A JP 15616079 A JP15616079 A JP 15616079A JP S5679584 A JPS5679584 A JP S5679584A
Authority
JP
Japan
Prior art keywords
output
input
phase comparator
fed
voltage controlled
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
JP15616079A
Other languages
Japanese (ja)
Other versions
JPS637073B2 (en
Inventor
Masanori Tsugita
Masanobu Shinoda
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
NEC Engineering Ltd
Original Assignee
NEC Corp
NEC Engineering Ltd
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, NEC Engineering Ltd, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP15616079A priority Critical patent/JPS5679584A/en
Publication of JPS5679584A publication Critical patent/JPS5679584A/en
Publication of JPS637073B2 publication Critical patent/JPS637073B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/60—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Receiver Circuits (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

PURPOSE:To ensure extremely certain discrimination, by applying the output of one phase comparator to a voltage controlled oscillator and an amplifier with amplitude limiter via a loop filter and adding the output of this oscillator to another phase comparator via a phase shifter. CONSTITUTION:An AM demodulator 1 outputs one input of two-frequency discriminating circuit. The output of a phase comparator 2 is fed as the control input to a voltage controlled oscillator 4 via a loop filter 3. The output of a loop filter 3 is fed as the input to an amplifier 8 with an amplitude limiter, on the one hand, the output can discriminate two frequencies. Further, another phase comparator is provided, and the output of the AM demodulation circuit 1 is fed to one input, and the output of the voltage controlled oscillator 4 is fed to another input via a 90 deg. phase circuit 5. Thus, the output of the AM demodulation circuit and the input signal to the phase comparator 6 are completely synchronized to enable the synchronizing detection.
JP15616079A 1979-11-30 1979-11-30 Signal discrimination circuit Granted JPS5679584A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15616079A JPS5679584A (en) 1979-11-30 1979-11-30 Signal discrimination circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15616079A JPS5679584A (en) 1979-11-30 1979-11-30 Signal discrimination circuit

Publications (2)

Publication Number Publication Date
JPS5679584A true JPS5679584A (en) 1981-06-30
JPS637073B2 JPS637073B2 (en) 1988-02-15

Family

ID=15621653

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15616079A Granted JPS5679584A (en) 1979-11-30 1979-11-30 Signal discrimination circuit

Country Status (1)

Country Link
JP (1) JPS5679584A (en)

Also Published As

Publication number Publication date
JPS637073B2 (en) 1988-02-15

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