JPS5492715A - Frequency modulator - Google Patents

Frequency modulator

Info

Publication number
JPS5492715A
JPS5492715A JP16048077A JP16048077A JPS5492715A JP S5492715 A JPS5492715 A JP S5492715A JP 16048077 A JP16048077 A JP 16048077A JP 16048077 A JP16048077 A JP 16048077A JP S5492715 A JPS5492715 A JP S5492715A
Authority
JP
Japan
Prior art keywords
afc
circuit
control circuit
frequency control
frequency
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
JP16048077A
Other languages
Japanese (ja)
Inventor
Hiroshi Kitaura
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 JP16048077A priority Critical patent/JPS5492715A/en
Publication of JPS5492715A publication Critical patent/JPS5492715A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To change the frequency of only one of first,second transmission circuits and yet let first and second automatic frequency control circuit operations be operated perfectly by adding a voltage shift circuit to the second automatic frequency control circuit.
CONSTITUTION: The reference CW oscillators A, B, 14a, 14b of the first automatic frequency control circuit (AFC circuit) 12 are selected according to video signals and the AFC circuit 12 is arranged to so act that the frequency of the low carrier FM signal becomes equal to either of the transmitters A, B to which said signal is supplied by being changed over with a switch 24. The switches 25, 26 of the second AFC circuit 19 are interlocked to the switch 24 so as to supply the output of a discriminator 21 via voltage shift circuit 27 or directly to a DC amplifier 22. Hence, the frequency of only one of the first, second AFC circuits 12, 19 may be changed and yet the first, second AFC operations may be perfectly effected even after this.
COPYRIGHT: (C)1979,JPO&Japio
JP16048077A 1977-12-29 1977-12-29 Frequency modulator Pending JPS5492715A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16048077A JPS5492715A (en) 1977-12-29 1977-12-29 Frequency modulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16048077A JPS5492715A (en) 1977-12-29 1977-12-29 Frequency modulator

Publications (1)

Publication Number Publication Date
JPS5492715A true JPS5492715A (en) 1979-07-23

Family

ID=15715853

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16048077A Pending JPS5492715A (en) 1977-12-29 1977-12-29 Frequency modulator

Country Status (1)

Country Link
JP (1) JPS5492715A (en)

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