Method for compressing message checksum and message yearcode inf

Details Method for compressing message checksum and message yearcode inf Method for compressing message checksum and message yearcode inf

1995-05-01

1997-04-15

Chin, Stephen

Pulse or digital communications

Bandwidth reduction or expansion

Television or motion video signal

H04B 702

Patent

active

056217595

ABSTRACT:
In each receiver (40) at least one datecode is stored which defines a subscription period during which the receiver is entitled to display received messages. For each message (200) to be transmitted, a datecode which defines a particular subscription date to be associated with the message is generated, the datecode defined by a predetermined number of bits. The datecode is compressed into a compressed datecode (220) based on the datecode, the compressed datecode being less in number of bits than the predetermined number of bits of the corresponding datecode. A modified checksum word (230) for the message is generated based on the plurality of bits which represent the message (200) and the predetermined number of bits which represent the datecode that corresponds to the compressed datecode (220). The modified checksum word (230) is associated with the message and the compressed datecode (220) for transmission.

REFERENCES:
patent: 4929946 (1990-05-01), O'Brien et al.

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