1
Klein S Gilhousen, Jerrold A Heller, Michael Van Harding, Robert D Blakeney II: Selective-subscription descrambling. M A COM Government Systems, Cable Home Communication, Edward W Callan, December 8, 1987: US04712238 (230 worldwide citation)

A system in a subscriber television network for enabling descrambling of a received scrambled signal on a prepaid basis and/or an impulse-purchase basis. A received mask signal uniquely related to the scrambled signal is compared with a received authorization signal indicating whether the subscriber ...


2
James N Esserman, Jerrold A Heller: Apparatus and method for upgrading terminals to maintain a secure communication network. General Instrument Corporation, Barry R Lipsitz, September 1, 1992: US05144664 (178 worldwide citation)

A secure communication network serves a plurality of terminals grouped into different security categories. Each terminal includes a replaceable security element containing a security algorithm specific to the security category to which the terminal is assigned. Upon the breach of a particular securi ...


3
Woo H Paik, Jerrold A Heller, Gordon K Walker: Digital audio scrambling system with error conditioning. M A COM Linkabit, Edward W Callan, August 26, 1986: US04608456 (125 worldwide citation)

In the scrambling system, an analog audio signal is converted into a digital signal to provide a sequence of digital signal samples corresponding to the analog audio signal. Each digital signal sample is compressed to provide compressed signal samples having a sign bit, three exponent bits and seven ...


4
Jerrold A Heller, Woo H Paik: Video signal scrambling and descrambling systems. M A COM Linkabit, Baker Maxham Callan & Jester, January 7, 1986: US04563702 (125 worldwide citation)

Systems for scrambling and descrambling video information lines. The scrambling system includes a memory; a storage system for sequentially storing groups of four video information lines in the memory; and a retrieval means for forming groups of four scrambled video information lines by retrieving t ...


5
Woo H Paik, Scott A Lery, Chris Heegard, Edward A Krause, Jerrold A Heller: Method and apparatus for communicating digital information such as compressed video using treillis coded QAM. General Instrument Corporation, Barry R Lipsitz, June 14, 1994: US05321725 (119 worldwide citation)

A method and apparatus for communicating high definition television signals is provided. Video signals are divided into blocks of PCM data. The PCM data is processed using motion estimation and compensation to provide DPCM data. For each block, one of PCM and DPCM data is selected for transmission b ...


6
Klein S Gilhousen, Jerrold A Heller, Michael V Harding, Robert D Blakeney II: Selective enablement of descramblers. M A COM Government Systems, Cable Home Communication Corporation, Edward W Callan, December 20, 1988: US04792973 (101 worldwide citation)

A system in a subscriber television network for enabling descrambling of a received scrambled signal on a prepaid basis and/or an impulse-purchase basis. A received mask signal uniquely related to the scrambled signal is compared with a received authorization signal indicating whether the subscriber ...


7
Edward Krause, Woo H Paik, Vincent C Liu, Jerrold A Heller, Paul Shen, James N Esserman: Method and apparatus for refreshing motion compensated sequential video images. General Instrument Corporation, Barry R Lipsitz, October 15, 1991: US05057916 (63 worldwide citation)

An image area is refreshed during the transmission of a set of motion compensated sequential video images. The video images are divided into a plurality of adjacent regions. The image area is refreshed during a refresh cycle by communicating a different region in each successive video image of the s ...


8
Woo H Paik, Jerrold A Heller, Gordon K Walker: Digital audio scrambling system with pulse amplitude modulation. M A COM Government Systems, Cable Home Communication, Edward W Callan, June 21, 1988: US04752953 (19 worldwide citation)

In a system for scrambling an audio signal for transmission with a video signal having non-video information intervals, an analog audio signal is converted into a scrambled compressed digital audio signal; individual bits from the scrambled compressed digital audio signal are combined to provide 2-b ...