Digital TV with low cost auxiliary device communication system

Details Digital TV with low cost auxiliary device communication system Digital TV with low cost auxiliary device communication system

1985-06-18

1987-03-10

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

3581941, 358903, 455151, 360 69, H04N 500

Patent

active

046494286

ABSTRACT:
A digital TV system includes a CCU that is interconnected by a three-wire, high speed bus to a plurality of TV signal function modules for controlling operation thereof by means of a high speed hardware generated clock signal. A software generated clock signal in the CCU is supplied on a low speed two-wire auxiliary device bus which is connected to microprocessors in a plurality of auxiliary devices for performing functions ancillary to TV signal processing. The microprocessor in each auxiliary device is an off-the-shelf type that does not require any special hardware because the timing on the auxiliary device bus is sufficiently slow to enable software monitoring of the line and data transfer.

REFERENCES:
patent: 4322854 (1982-03-01), Bundens
patent: 4337480 (1982-06-01), Bourassin
patent: 4343042 (1982-08-01), Schrock
patent: 4392022 (1983-07-01), Carlson

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