JPS54145425A - Controller for carrier frequency of fm signal - Google Patents
Controller for carrier frequency of fm signalInfo
- Publication number
- JPS54145425A JPS54145425A JP5387778A JP5387778A JPS54145425A JP S54145425 A JPS54145425 A JP S54145425A JP 5387778 A JP5387778 A JP 5387778A JP 5387778 A JP5387778 A JP 5387778A JP S54145425 A JPS54145425 A JP S54145425A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signal
- carrier frequency
- normal
- output
- 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
Links
Landscapes
- Television Systems (AREA)
Abstract
PURPOSE: To control a normal carrier frequency over a wide range without using a crystal oscillator by coding a carrier frequency of the normal part of a sampled FM signal, by comparing it with a coded normal carrier frequency and by controlling the level of the normal modulation part which corresponds to the comparison deviation.
CONSTITUTION: This controller is equipped with separator circuit 8 which gates input FM signal (b) when receiving sampling signal (c) synchronizing with a horizontal synchronizing signal and frequency detection circuit 9 which codes the carrier frequency of the normal part of a FM signal sampled by this circuit 8. Then, digital comparator circuit 11 is provided which compares the output of circuit 9 with the coded normal carrier frequency of digital input circuit 10 so as to send out a deviation output. The output of this circuit 11 is converted by DA converter circuit 12 into an analog signal, which is applied to modulation circuit 6 via clamping circuit 5, thereby controlling the level of the normal modulation part equivalent to the comparison deviation.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5387778A JPS54145425A (en) | 1978-05-06 | 1978-05-06 | Controller for carrier frequency of fm signal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5387778A JPS54145425A (en) | 1978-05-06 | 1978-05-06 | Controller for carrier frequency of fm signal |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS54145425A true JPS54145425A (en) | 1979-11-13 |
JPS6219111B2 JPS6219111B2 (en) | 1987-04-27 |
Family
ID=12954966
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5387778A Granted JPS54145425A (en) | 1978-05-06 | 1978-05-06 | Controller for carrier frequency of fm signal |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54145425A (en) |
-
1978
- 1978-05-06 JP JP5387778A patent/JPS54145425A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS6219111B2 (en) | 1987-04-27 |
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