JPS5492715A - Frequency modulator - Google Patents
Frequency modulatorInfo
- 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
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
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) |
-
1977
- 1977-12-29 JP JP16048077A patent/JPS5492715A/en active Pending
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