Apparatus for receiving digital sound/data information

Details Apparatus for receiving digital sound/data information Apparatus for receiving digital sound/data information

1986-02-27

1988-05-10

Olms, Douglas W.

Land vehicles

Runner vehicle

Occupant steered

370 94, H04J 324, H04L 900

Patent

active

047440805

ABSTRACT:
A receiver for recovering sound/data information for a number of services transmitted digitally as a packet multiplex has the data, after demodulation, applied to a first unit (3) where it is resynchronized for application to a sync and data extraction unit (19). In the extraction unit (19) the data packets are processed and applied, at a different clock rate, to a packet bus (25) to which a desired number of packet digital sound recovery devices (26) and packet encryption recovery devices (27) are connected. Instead of each recovery device (26, 27) interrogating all the packets of data those packets carrying a service identification address are processed in the extraction unit (19) and service addresses for user selected services are applied from a microcomputer (23) over an I.sup.2 C bus to the recovery devices (26, 27), control information also being received and interpreted by said extraction unit (19) and applied in similar manner to the recovery devices (26, 27).

REFERENCES:
patent: 4354263 (1982-10-01), Bordry et al.
patent: 4525830 (1985-06-01), Cohen et al.
patent: 4535448 (1985-08-01), Baxter et al.
European Broadcasting Union document SPB 284, 4th revised Edition; "Television Standards for the Broadcasting Satellite Service Specification of the GMAC/Packet System" Feb. 1985, pp. 1-104.

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