Cryptography – Key management – Having particular key generator
Patent
1993-02-01
1994-12-20
Cain, David C.
Cryptography
Key management
Having particular key generator
380 48, 380 28, 370118, H04L 900
Patent
active
053751710
ABSTRACT:
Transmission system, and transmitter and receiver for use in the transmission system for transmitting and receiving digital signals containing modulated bit allocation information. The transmitter encodes a wide-band digital signal into subband signals which are each made up of successive signal blocks having a predetermined number of samples of that subband signal. The samples in the signal blocks of the subband signals are quantized to produce quantized samples in the signal blocks, and bit allocation information denoting how many bits the samples in the signal blocks are to be quantized by is generated. The bit allocation information (or a portion thereof) is modulated to obtain modulated bit allocation information. The quantized samples in the signal blocks and the modulated bit allocation information are included in a digital signal applied by the transmitter to a transmission medium. The receiver receives a replica of the digital signal applied to the transmission medium. The modulated bit allocation information is demodulated to obtain the bit allocation information. The quantized samples in the signal blocks and the bit allocation information are used to obtain replicated samples in the signal blocks which substantially correspond to the original samples in the signal blocks of the subband signals. The replicated samples are used to produce a replica of the original wide-band digital signal.
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U.S. Application A.
U.S. Application B.
U.S. Application C.
U.S. Application D.
Dewolf Jan
Hoogendoorn Abraham
Lokhoff Gerardus
Cain David C.
U. S. Philips Corporation
Weiss Richard A.
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