Closed circuit television system having seamless interactive tel

Details Closed circuit television system having seamless interactive tel Closed circuit television system having seamless interactive tel

1992-04-16

1993-08-10

Eisenzop, Reinhard J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

3581911, 434323, H04N 700

Patent

active

RE0343404

ABSTRACT:
A closed circuit interactive television system (10) provides a multichannel television signal from a localized head end (12 which is used for individualized interactive selections by a plurality of users (22, 24, 26). Each user station contains a conventional televison receiver (32a, 32b, 32c) and a smart box or interface and selection device (30a, 30b, 30c). The smart box interface and selection device (30) is disposed between the television receiver (32) and the RF distribution amplifier (36). The number of user stations (22, 24, 26) on the system (10) is virtually unlimited. The system (10) provides the audio/video television signals (14, 16, 18, 20) in at least frame accurate synchronization to enable seamless video switching between channels, which seamlessness is enhanced through the view of a pair of tuners (44, 46,) in the interface selection box (30a, 30b, 30c) which are alternately commanded to pretune to the channel of the next actual choice made prior to the changeover under control a microprocessor (40) in response to command signals embedded in the television signals being received.

REFERENCES:
patent: 4264924 (1981-04-01), Freeman
patent: 4264925 (1981-04-01), Freeman
patent: 4439784 (1984-03-01), Furukawa et al.
patent: 4507680 (1985-03-01), Freeman
patent: 4573072 (1986-02-01), Freeman
patent: 4602279 (1986-07-01), Freeman
patent: 4647980 (1987-03-01), Steventon et al.
patent: 4733301 (1988-03-01), Wright, Jr.

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