Robert D Heath

US Patent:

6489902, Dec 3, 2002

Filed:

Sep 17, 2001

Appl. No.:

09/953783

Inventors:

Robert Jeff Heath - San Diego CA

Assignee:

Hughes Electronics Corporation - El Segundo CA

International Classification:

H03M 700

US Classification:

341 87

Abstract:

A method, and apparatus for accomplishing the method, of compressing data for transmission over a communications channel by receiving one or more data symbols comprising a current data string and at least one subsequent symbol, matching a longest previous data string with the current data string, the previous data string being defined by a code word, placing the code word into a compressed data stream, attempting to extend the current data string by a plurality of symbols, placing, in the event the current data string is extended, a string-extension length indicative of the plurality of symbols into the compressed data stream, and transmitting the compressed data stream though the communications channel.

US Patent:

6683547, Jan 27, 2004

Filed:

Apr 22, 2002

Appl. No.:

10/127643

Inventors:

John Border - Poolesville MD
Matthew Butehorn - Mt. Airy MD
Robert Jeff Heath - San Diego CA

Assignee:

Hughes Electronics Corporation - El Segundo CA

International Classification:

H03M 700

US Classification:

341106, 341 79, 341 59, 341 67, 704200

Abstract:

A method, apparatus and computer program product for encoding data transmitted over a communications channel, including pre-loading an encoder dictionary with a set of character strings expected to appear in input data to be encoded; and encoding the input data with the set of expected character strings pre-loaded in the encoder dictionary. In another aspect, there is provided a method, apparatus and computer program product for decoding encoded data received over a communications channel, including pre-loading a decoder dictionary with a set of character strings expected to appear in the encoded data; and decoding the encoded data with the set of expected character strings pre-loaded in the decoder dictionary.

US Patent:

6842437, Jan 11, 2005

Filed:

Mar 3, 2000

Appl. No.:

09/518452

Inventors:

Robert Jeff Heath - San Diego CA, US

Assignee:

Hughes Electronics Corporation - El Segundo CA

International Classification:

H04B 7212

US Classification:

370322, 370337, 370348, 370449

Abstract:

A method of transmitting time division multiplexed data from a satellite terminal to a satellite wherein the satellite terminal receives a command indicating to transmit data during a frame comprising a plurality of timeslots in accordance with a timeslot reordering scheme. The timeslot reordering scheme is selected to spread data from respective satellite terminals to different timeslots throughout the frames. A processor monitors the use of channels by the satellite terminals, stores bandwidth requests using queues, allocates channels in accordance with bandwidth requests and a bandwidth allocation algorithm, and transmits the channel allocations in a frame. Timeslots not allocated to any of the satellite terminals are contention channels. The number of contention channels changes dynamically, depending on demand for the plurality of channels by the satellite terminals. Queues are provided for each channel for storing high and low priority rate requests and high and low priority volume requests.

US Patent:

6940899, Sep 6, 2005

Filed:

Mar 16, 2001

Appl. No.:

09/810769

Inventors:

Robert G. Heath - San Diego CA, US

Assignee:

Hughes Electronics Corporation - El Segundo CA

International Classification:

H04B001/66

US Classification:

375240, 37524025

Abstract:

A method and an apparatus are provided for performing parameter negotiation in a data compression link. When data is sent along the communication link in a compressed form, the escape character is not modified. When sending data in an uncompressed form, the escape character is followed by a command and the escape character is modified. A parameter mode can be entered when data is being sent uncompressed. During parameter mode, parameter negotiation between the modem peers can be accomplished without interrupting the communication link.

US Patent:

6985455, Jan 10, 2006

Filed:

Aug 2, 2000

Appl. No.:

09/631269

Inventors:

Robert Jeff Heath - San Diego CA, US
Robert J. Torres - Germantown MD, US
Sreenivas Ramaswamy - Bethesda MD, US
Stephanie Demers - Edison NJ, US

Assignee:

Hughes Electronics Corporation - El Segundo CA

International Classification:

H04B 7/185

US Classification:

370316, 370414, 370429

Abstract:

An approach for allocating bandwidth in a satellite communication system is disclosed. The system includes a set of global queues that store bandwidth requests, which are received from a number of satellite terminals. The received bandwidth request include a high priority rate request, a low priority rate request, a high priority volume request, and a low priority volume request. A bandwidth control processor determines bandwidth request type and priority of the received bandwidth requests and places the bandwidth requests in the appropriate global queues based upon the determined bandwidth request type and priority. Each of the global queues corresponds to a data rate associated with of each a plurality of channels. The system also utilizes a set of local queues that correspond to the channels. The BCP moves the bandwidth requests from the global queues to the local queues.

US Patent:

7016408, Mar 21, 2006

Filed:

Nov 9, 2001

Appl. No.:

10/054219

Inventors:

Robert Jeff Heath - San Diego CA, US

Assignee:

The DirecTV Group, Inc. - El Segundo CA

International Classification:

H04N 7/12

US Classification:

37524001

Abstract:

A method, system and computer program product for encoding and decoding data over a communications channel, including receiving input data to be encoded; generating compressed codes from the input data using a Lempel-Ziv-Jeff-Heath (LZJH) data compression algorithm; and applying a minimum redundancy coding algorithm on the compressed codes to generate compressed data.

US Patent:

56256280, Apr 29, 1997

Filed:

Mar 15, 1995

Appl. No.:

8/404707

Inventors:

Robert G. Heath - San Diego CA

Assignee:

Hughes Electronics - Los Angeles CA

International Classification:

H04B 7212
H04J 317

US Classification:

370321

Abstract:

An method of Aloha optimization involves designating a time period as an inroute frame. Such designating includes designating a first portion of the inroute frame as a Transaction Reservation portion, and designating a second portion of the inroute frame as an Aloha portion. A request is transmitted from a first remote terminal to the host terminal that the host terminal allocate one or more slots of the Transaction Reservation portion to the first remote terminal. One or more unallocated slots within the Transaction Reservation portion are then redesignated as extra Aloha slots. A target slot is then randomly selected by a second remote terminal from the slots within the Aloha portion and the extra Aloha slots.

US Patent:

59736305, Oct 26, 1999

Filed:

Mar 1, 1999

Appl. No.:

9/258782

Inventors:

Robert Jeff Heath - San Diego CA

Assignee:

Hughes Electronics Corporation - El Segundo CA

International Classification:

H03M 700

US Classification:

341 87

Abstract:

A method of compressing data involves receiving a symbol, and a subsequent symbol; determining in a compression dictionary whether the symbol has a valid extension pointer; using, in the event the symbol does have a valid extension pointer, the valid extension pointer to access string extension symbols; determining, in the event the symbol does have a valid extension pointer, whether the string extension symbols equal the at least one subsequent symbol; determining in the compression dictionary, in the event the string extension symbols do not equal the at least one subsequent symbol, whether the symbol has a valid parallel extension; repeating, in the event the symbol has a valid parallel extension, the using step; repeating, in the event the string extension symbols do not equal the at least one subsequent symbol, the determining of whether the symbol has a valid extension pointer; inserting, in the event the symbol does not have a valid extension pointer or in the event the symbol does not have a valid parallel extension, a code word indicative of a longest string found into a compressed data stream; determining whether the longest string was a single symbol; extending, in the event the longest string was a single symbol, the longest string by one symbol; extending, in the event the longest string was not a single symbol, the longest string by a plurality of symbols; inserting a string extension signalling code word if the string is extended by multiple symbols and transmitting the compressed data stream through the communications channel.