Patents by Inventor Gerald O. Crowther

Gerald O. Crowther has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 4937866
    Abstract: In a pay television system, a program signal is transmitted scrambled to prevent its unauthorized reception, the scrambled signal being accompanied by authorization codes, one for each authorized subscriber, a subscription key and a pay-per-view key. At a receiver, if the appropriate authorization code is received, the receiver functions in the subscription mode in which mode the subscription key provides for the descrambling of the program signal. If the appropriate authorization code is not received, indicating that the subscriber is not pre-authorized to receive the program in an intelligible manner, the receiver is set to function in a pay-per-view mode in which mode, on request, the pay-per-view key provides for the descrambling of the program signal. If there is a delay receiving the appropriate authorization code, the receiver can be set into the pay-per-view mode for at least the period of the delay, so that the scrambled signal is immediately rendered intelligible.
    Type: Grant
    Filed: July 29, 1987
    Date of Patent: June 26, 1990
    Assignee: U.S. Philips Corporation
    Inventors: Gerald O. Crowther, Peter R. Brennand
  • Patent number: 4864614
    Abstract: In a transmission system authorization codes are transmitted to authorize subscribers to receive scrambled signals in an intelligible manner, such a system being a television transmission system. If each subscriber were assigned a unique authorization code an extremely long period of time would be required to transmit these codes for a national broadcast system. With the present arrangement, the authorizing code includes a multi-bit binary code word (18,20) which is unique to a group of subscribers, this code word being followed by a train of binary pulses (19',19";21', 21",) the number of pulses in the train being not less than the number of subscribers in the group. Each subscriber is allocated a unique pulse position in the pulse train (19',19";21',21",) at which position the state of the pulse either authorizes or inhibits the subscriber from receiving the scrambled signal intelligibly.
    Type: Grant
    Filed: September 8, 1988
    Date of Patent: September 5, 1989
    Assignee: U.S. Philips Corporation
    Inventor: Gerald O. Crowther
  • Patent number: 4748576
    Abstract: A pseudo-random binary sequence generator comprises at least one shift register (S, T) arranged in a recirculating loop and having a plurality of logic gates (G) for logically combining the outputs of selected stages of the register to provide a pseudo-random sequence, and a multiplexer (M), having a p data inputs and q address inputs all connected to selected shift register stages, and which selects at any instant one of the p data input bits in accordance with the q-bit address word to provide the generator output. The number s of logic gates is especially high and is related to the total number r of shift register stages (r>p+q) by the expression: 2.sup.s .gtoreq.r.sup.2. Some of the shift register stages of the or each shift register are connected to selected data inputs of the multiplexer and others of the stages of the same shift register are connected to selected address inputs of the multiplexer.
    Type: Grant
    Filed: October 1, 1985
    Date of Patent: May 31, 1988
    Assignee: U.S. Philips Corporation
    Inventors: Henry J. Beker, Luc Emiel L. Boes, Peter R. Brennand, Edmund R. Brown, Gerald O. Crowther, Wilhelmus M. Dorn, Stanley M. Edwardson, Stephen R. Ely, Louis C. Guillou, Peter M. Jenner, Sylvia M. Jennings, Michael J. Knee, Arthur G. Mason, Jean-Marie C. Nicolas
  • Patent number: 4727579
    Abstract: A television receiver for receiving scrambled television signals has an arrangement (3) which provides scrambled video components (V) and packet arranged sound/data components (D) some of which are also scrambled. The components (D) are applied to a packet demultiplexer (4) where the packets are assembled from the data in several lines in the signal to provide at a first output (P), the respective packets carrying sound/data information and, at a second output (E), encrypted control data which is applied to a sub-system (6) to produce a video scrambling control word (VS) for each line of the video components. The sub-system (6) during each line produces further bits which are applied to a descrambling control word generator (7) which assembles these further bits from three lines to form a packet scrambling control word.
    Type: Grant
    Filed: May 11, 1984
    Date of Patent: February 23, 1988
    Assignee: U.S. Philips Corporation
    Inventors: Derek T. Wright, Gerald O. Crowther
  • Patent number: 4651205
    Abstract: In a television receiver for a transmission system in which the video signal is scrambled to allow only for its authorized reception, a video signal processor (8) is provided in which the scrambled video signal is de-scrambled. A low rate control data signal present at an output (11) of a sound/data signal processor (10) is employed to periodically set (say once every one or two seconds) a master pseudo random pulse generator (12B) producing an output of pseudo random configuration at frame rate which is used to periodically set a video slave pseudo random pulse generator (15) to produce an output of pseudo random configuration at line frequency. This is applied to an input S of the processor (9) and forms the scrambling key for the line-by-line de-scrambling of the video signal.
    Type: Grant
    Filed: June 20, 1984
    Date of Patent: March 17, 1987
    Assignee: U.S. Philips Corporation
    Inventor: Gerald O. Crowther
  • Patent number: 4636854
    Abstract: In a television receiver for a transmission system in which the video signal is scrambled to allow only for its authorized reception, a video signal processor (8) is provided in which the scrambled video signal is de-scrambled. A low rate encrypted signal present at an output (11) of a sound/data signal processor (10) is decrypted and employed to periodically set (say once every one or two seconds) a master pseudo ramdom pulse generator (12B) producing an output of pseudo random configuration at the frame rate which is used to periodically set a video slave pseudo random pulse generator (15) to produce an output of pseudo random configuration at line frequency. This is applied to an input S of the processor (8) and forms the scrambling key for the line-by-line de-scrambling of the video signal.
    Type: Grant
    Filed: June 20, 1984
    Date of Patent: January 13, 1987
    Assignees: U.S. Philips Corporation, Independent Broadcasting Authority
    Inventors: Gerald O. Crowther, Arthur G. Mason
  • Patent number: 4231031
    Abstract: A remote control system for TV receiver control. The system uses infra-red transmission to trasmit an infra-red data pulse on each edge of a pulse duration signal comprising a coded pattern of binary 0 and 1 bits which are formed by pulses of respective different lengths. The original pulse duration signal can be reconstituted at a receiver by a bistable element which is responsive to the infra-red data pulses. Since the regenerated modulating waveform could be in anti-phase with the original modulating waveform, the sequence of data pulses is transmitted twice and an additional data pulse is transmitted between successive transmissions, so that one or the other of the two regenerated modulating waveforms must be in phase with the original modulating waveform.
    Type: Grant
    Filed: April 7, 1978
    Date of Patent: October 28, 1980
    Assignee: U.S. Philips Corporation
    Inventors: Gerald O. Crowther, Terence A. Douglas, Howard M. Farmer