JPS57148432A - Frequency synchronization system - Google Patents
Frequency synchronization systemInfo
- Publication number
- JPS57148432A JPS57148432A JP56033639A JP3363981A JPS57148432A JP S57148432 A JPS57148432 A JP S57148432A JP 56033639 A JP56033639 A JP 56033639A JP 3363981 A JP3363981 A JP 3363981A JP S57148432 A JPS57148432 A JP S57148432A
- Authority
- JP
- Japan
- Prior art keywords
- time
- outputs
- counters
- transmitters
- timer
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/18—Arrangements for synchronising broadcast or distribution via plural systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/01—Reducing phase shift
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/65—Arrangements characterised by transmission systems for broadcast
- H04H20/67—Common-wave systems, i.e. using separate transmitters operating on substantially the same frequency
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/65—Arrangements characterised by transmission systems for broadcast
- H04H20/76—Wired systems
- H04H20/82—Wired systems using signals not modulated onto a carrier
- H04H20/83—Wired systems using signals not modulated onto a carrier not sharing the network with any other service
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
- Radio Transmission System (AREA)
Abstract
PURPOSE:To equalize mutual transmission frequencies to each other accurately at low cost by dividing the carrier frequency of every channel by time at constant intervals of time and sending it from a master station, and then controlling a transmission frequency on the basis of the received signal at a subordinate station. CONSTITUTION:At a master station 1, signals with carrier frequencies fT1-fTn of transmitters 21-2n for respective channels are led to counters 121-12n, whose outputs are processed by parallel-series conversion by converters 131-13n, whose outputs are synthesized 5 and sent to a subordinate station 6 through a communication circuit 7. Further, a signal fO from a pilot oscillator 15 is sent to the circuit 7 and a timer 16 to operate the counters at constant intervals of time on time-division basis by the output of the timer 16. At a subordinate station 6, the signal fO is extracted through a BPF17 and led to a timer 16', thereby counting the outputs f'T1-f'Tn of transmitters 2'1-2'n by counters 12'1-12'n for the same time with the master station. The count outputs are compared by comparators 191-19n with signals obtained by converting the sent digital signals by series-parallel converters 13'1-13'n, thereby controlling the transmission frequencies of the transmitters 2'1-2'n by comparison outputs.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56033639A JPS57148432A (en) | 1981-03-09 | 1981-03-09 | Frequency synchronization system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56033639A JPS57148432A (en) | 1981-03-09 | 1981-03-09 | Frequency synchronization system |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57148432A true JPS57148432A (en) | 1982-09-13 |
JPS6232653B2 JPS6232653B2 (en) | 1987-07-16 |
Family
ID=12392014
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56033639A Granted JPS57148432A (en) | 1981-03-09 | 1981-03-09 | Frequency synchronization system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57148432A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0138366A2 (en) * | 1983-09-07 | 1985-04-24 | BRITISH TELECOMMUNICATIONS public limited company | Frequency control for point-to-multipoint radio |
-
1981
- 1981-03-09 JP JP56033639A patent/JPS57148432A/en active Granted
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0138366A2 (en) * | 1983-09-07 | 1985-04-24 | BRITISH TELECOMMUNICATIONS public limited company | Frequency control for point-to-multipoint radio |
US4670889A (en) * | 1983-09-07 | 1987-06-02 | British Telecommunications Plc | Frequency control for point to multipoint radio |
Also Published As
Publication number | Publication date |
---|---|
JPS6232653B2 (en) | 1987-07-16 |
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