Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1991-12-09
1993-06-15
Cain, David
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 10, 380 19, 358196, 381 31, H04N 7167
Patent
active
052206025
ABSTRACT:
A NICAM compatible baseband television signal converter is provided. A television signal including a NICAM digital audio subcarrier is converted to baseband and the NICAM subcarrier is filtered therefrom. The video and analog audio portions of the baseband television signal are demodulated. The demodulated video is descrambled and the demodulated analog audio is descrambled and/or volume controlled. The demodulated video and analog audio signals are then remodulated onto respective video and analog carriers. The filtered NICAM digital audio subcarrier is mixed with the video carrier to provide a modulated NICAM carrier. The remodulated video and analog audio signals are combined with the modulated NICAM carrier for output to a video appliance such as a television or video recorder.
REFERENCES:
patent: 4922537 (1990-05-01), Frederiksen
patent: 4937866 (1990-06-01), Crowther et al.
patent: 5138457 (1992-08-01), Sakai et al.
Robbins Clyde
Taupier Leonard
Cain David
General Instrument Corporation
Lipsitz Barry R.
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