Telecommunications – Interference signal transmission
Patent
1988-11-30
1990-02-13
Woodiel, Donald O.
Telecommunications
Interference signal transmission
455 6, 358 86, H04H 100
Patent
active
049013670
ABSTRACT:
A two-way cable distribution system for offices and office/apartment complexes wherein a single cable is used to interconnect tenants or owners with video/audio, facsimile, security and data services; with each user being allocated dual TV channels for the simultaneous transmission and reception of programs--all with complete privacy. User's multi-channel remote switching and processing converters (RSPC) are mounted in the switching control center where they also double as precision frequency controlled channel processors and eliminate problems of switching video crosstalk that occurs with IF or baseband switching. Spectrum capacity on each riser exceeds 800 MHz and enables more than 60 users per riser, each to be assigned 12 MHz bandwidth, without the need for line extenders amplifiers. Trunking of signals between buildings within a complex is not required because of riser transmissions that assign user drops in descending frequency along the length of the cable. Multiple subcarriers in the user's assigned spectrum transmit signals that control switching of channels in the RSPC and also switching of program sources such as videophone. The 12 MHz bandwidth allocated to each user's RSPC enables it to introduce a system whereby high definition TV (HDTV) can be transmitted to users that need not obsolete existing TV receivers. The addition of a limited number of video cassette recorders (VCR) at the switching control center enables home cable theater (HCT) with fine picture definition. Users would not require personal VCS's, merely use the remote control feature of their RSPC for impulse pay-per-view reception of films.
REFERENCES:
patent: 4538174 (1985-08-01), Garzini et al.
patent: 4673976 (1987-06-01), Wreford-Howard
Scutch III Frank M.
Woodiel Donald O.
Wray James C.
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