Cryptographic digital signal transceiver method and apparatus
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United States of America Patent
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Mar 28, 1989
Grant Date -
N/A
app pub date -
Oct 17, 1984
filing date -
Oct 17, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Hybrid subband coding and decoding (using different encloding/decoding algorithms in at least one subband channel) and subband time delay compensation at a point of maximum digital bandwidth compression are effected so as to reduce required DSP on-chip memory requirements. At the same time a special digital signal format is employed so as to provide enhanced data frame synchronization, enhanced cryptographic synchronization and selective signalling ability within a cryptographic digital signal transceiver. The ability to successfully accomplish late entry (or to re-establish synchronization once lost) into an ongoing received message is provided.
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