System and method for interfacing a transport decoder to a natio

Details System and method for interfacing a transport decoder to a natio System and method for interfacing a transport decoder to a natio

1996-03-29

1997-10-07

Cain, David C.

Cryptography

Key management

Having particular key generator

380 9, 380 20, H04N 7167

Patent

active

056756542

ABSTRACT:
A transport decoder 110, for receiving and processing a transport data stream using MPEG-2 formats, includes connections to a physical layer channel interface (channel interface) 112, a buffer memory 114, a host microprocessor 116, audio and video decoders 118/120, and clock signal circuitry 122. The transport decoder also includes an interface to a decoder which does not include a "data valid" input terminal. Upon receipt of encoded data packets, the transport decoder recognizes a frame synchronization byte and transfers an encoded data packet to an external decoder via the interface. The transport decoder sets a count value for a predetermined number of bytes in the encoded data packet and sends the packet data to the external decoder. When the specified number of bytes have been sent to the external decoder, the transport decoder determines if another synchronization byte has been encountered. If another synchronization byte has been found, the transport decoder continues to send encoded data to the decoder. Otherwise, the transport decoder sends zero-valued data to the external decoder.

REFERENCES:
patent: 4941173 (1990-07-01), Boule et al.
patent: 5361062 (1994-11-01), Weiss et al.
patent: 5581310 (1996-12-01), Vinekar et al.
patent: 5588025 (1996-12-01), Strolle et al.
patent: 5598222 (1997-01-01), Lane
patent: 5613001 (1997-03-01), Bakhoum
National Renewable Security Standards Committee (NRSS), "EIA Standard for Conditional Access", Version 2.6 Draft, Apr. 21, 1995, pp. 1-20.

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