JPS6467044A - Synchronizing signal detection circuit - Google Patents
Synchronizing signal detection circuitInfo
- Publication number
- JPS6467044A JPS6467044A JP62223372A JP22337287A JPS6467044A JP S6467044 A JPS6467044 A JP S6467044A JP 62223372 A JP62223372 A JP 62223372A JP 22337287 A JP22337287 A JP 22337287A JP S6467044 A JPS6467044 A JP S6467044A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- state
- synchronizing signal
- noise
- under
- 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
Landscapes
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
PURPOSE:To enable a synchronizing signal to be obtained by a simple constitution under the state that the signal is not transmitted by obtaining the synchronizing signal based on a noise signal from a noise signal output means under the state that the signal is not transmitted. CONSTITUTION:Under the state that a receiving signal does not exist, only the noise signal is supplied to an AGC amplifier 2 from the noise output circuit 5. Then, as the AGC amplifier 2 is changed to a high gain state under that state, the noise signal is amplified and supplied to a narrow-band filter 3. As a signal of which frequency is nearly the same as that of the synchronizing signal is contained in the noise signal, the signal of which frequency is neraly the same as that of the synchronizing signal is outputted by the narrow-band filter 3. This signal is converted to a digital signal by a comparator 4 and used as the synchronizing signal in a receiving device. Thus the signal corresponding to the synchronizing signal can be obtained under the state that the receiving signal does not exist.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62223372A JPS6467044A (en) | 1987-09-07 | 1987-09-07 | Synchronizing signal detection circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62223372A JPS6467044A (en) | 1987-09-07 | 1987-09-07 | Synchronizing signal detection circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6467044A true JPS6467044A (en) | 1989-03-13 |
Family
ID=16797111
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62223372A Pending JPS6467044A (en) | 1987-09-07 | 1987-09-07 | Synchronizing signal detection circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6467044A (en) |
-
1987
- 1987-09-07 JP JP62223372A patent/JPS6467044A/en active Pending
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