JPS5683189A - Audio multiplex modulation circuit - Google Patents

Audio multiplex modulation circuit

Info

Publication number
JPS5683189A
JPS5683189A JP15997079A JP15997079A JPS5683189A JP S5683189 A JPS5683189 A JP S5683189A JP 15997079 A JP15997079 A JP 15997079A JP 15997079 A JP15997079 A JP 15997079A JP S5683189 A JPS5683189 A JP S5683189A
Authority
JP
Japan
Prior art keywords
signal
frequency
2omegah
output
omegac
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
JP15997079A
Other languages
Japanese (ja)
Inventor
Masashi Sugano
Sukeichi Miki
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP15997079A priority Critical patent/JPS5683189A/en
Publication of JPS5683189A publication Critical patent/JPS5683189A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/06—Systems for the simultaneous transmission of one television signal, i.e. both picture and sound, by more than one carrier

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Color Television Systems (AREA)
  • Television Systems (AREA)

Abstract

PURPOSE:To enable to constitute a system with one system of PLL, by using a signal in synchronizing with a video signal for the reference signal of VCO in FM modulation through a signal difference of left and right audio signal. CONSTITUTION:The signal difference L-R of audio L and R signals, is fed to VCO5 and the FM modulation signal is obtained. The VCO5, frequency divider 6, phase detector 7, and LPF8 form a PLL. On the other hand, the horizontal synchronizing signal in frequency omegaH is multiplied 37 by two into 2omegaH frequency. The phase shifter 35 produces two signals different in the phase by 90 deg. each other from this 2omegaH signal, and the phase shifter 36 produces the similar 2 signals from the carrier chrominance signal in frequency omegaC. The output of the phase shifters 35, 36 is given to the multipliers 33 and 34 to obtain the frequency of omegaC-2omegaH at the input of the frequency divider 32. The output of the frequency divider 32 is taken as the reference signal, allowing to obtain the center frequency of VCO26 as omegaC-2omegaH. The output of the VCO26 is mixed 30 with the carrier chrominance signal to obtain the subchannel signal taking the frequency 2omegaH as the center at the output of LPF31.
JP15997079A 1979-12-10 1979-12-10 Audio multiplex modulation circuit Pending JPS5683189A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15997079A JPS5683189A (en) 1979-12-10 1979-12-10 Audio multiplex modulation circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15997079A JPS5683189A (en) 1979-12-10 1979-12-10 Audio multiplex modulation circuit

Publications (1)

Publication Number Publication Date
JPS5683189A true JPS5683189A (en) 1981-07-07

Family

ID=15705141

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15997079A Pending JPS5683189A (en) 1979-12-10 1979-12-10 Audio multiplex modulation circuit

Country Status (1)

Country Link
JP (1) JPS5683189A (en)

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