Telecommunications – Transmitter and receiver at separate stations – With control signal
Patent
1995-09-08
1998-07-14
Faile, Andrew
Telecommunications
Transmitter and receiver at separate stations
With control signal
455103, 455155, 455119, 370486, H04B 100
Patent
active
057818479
ABSTRACT:
In multiple-channel microwave transmitters and communications systems, such as multi-point video distribution systems operating at frequencies of around 29 GHz or 40 GHz, good frequency stability for each of the channel frequencies is achieved with a feed-back loop including an error detector circuit. The error detector circuit (39,29) is coupled between a sampler and an input circuit of the source. This detector circuit detects any drift or other error in the carrier frequency of the sample from the desired microwave frequency for that channel signal and provides a corrective signal to the input circuit. The part of the feed-back loop comprising at least a part of the detector circuit is common to a group of the channels. Switch means couple the common part of the feed-back loop between the sampler and the source input circuit of each channel, and so permit this common part to be time multiplexed between the respective feed-back loops of the group of channels. The input circuit for each source applies an up-datable bias signal for regulating the frequency of the source in accordance with the last corrective signal generated by the detector circuit for that source. By adopting such a stabilisation arrangement in accordance with the present invention, expensive component parts of the feed-back loop can be common to a group of the channels, so reducing the assembly cost of the multiple-channel transmitter. Good long-term frequency stability for all the channels can be obtained, including a reliably constant frequency relationship between the channels.
REFERENCES:
patent: 4545075 (1985-10-01), Miller et al.
patent: 4747160 (1988-05-01), Bossard
patent: 5125100 (1992-06-01), Katznelson
patent: 5294895 (1994-03-01), Feeney et al.
patent: 5471647 (1995-11-01), Gerlach et al.
"MPT 1550, Issue 1, Performance Specification for Analogue Multipoint Video Distribution Systems . . . " Sep., 1993, pp. i-30.
"British Telecom Technology Journal", vol. 7, No. 1, Jan. 1989, pp. 1-19.
"The M.sup.3 VDS Saxmundham Demonstrator: Multi-Channel TV Distribution by mm-Waves" By M. Pilgrim et al on pp. 5-19 of The British Telecom Technology Journal, vol. 7, No. 1, Jan. 1989.
Clarke Ian M.
Feeney Stuart M.
Eason Leroy
Faile Andrew
Moe Aung S.
U.S. Philips Corporation
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