專利 US6433835 - Expanded information capacity for existing communication transmission systems

(12) United States Patent ao) Patent No.: us 6,433,835 Bi

Hartson et al. (45) Date of Patent: Aug. 13,2002

(54) EXPANDED INFORMATION CAPACITY FOR EXISTING COMMUNICATION TRANSMISSION SYSTEMS

(75) Inventors: Ted E. Hartson, Scottsdale, AZ (US);

Robert V. C. Dickinson, Allentown, PA
(US); Walter S. Ciciora, Southport, CT
(US)

(73) Assignee: Encamera Sciences Corporation,

Mountain View, CA (US)

( * ) Notice: Subject to any disclaimer, the term ol this patent is extended or adjusted under 35 U.S.C. 154(b) by 0 days.

(21) Appl. No.: 09/062,225

(22) Filed: Apr. 17, 1998

(51) Int. C I. II04N 5/21

(52) U.S. CI 348/608; 348/723

(58) Field of Search 348/608, 723,

348/473, 429.1, 432.1, 470

(56) References Cited

U.S. PATENT DOCUMENTS

FOREIGN PATENT DOCUMENTS

EP 0 577 351 1/1994 H04N/7/08

OTHER PUBLICATIONS

Press Release ol WavePhore, Inc. entitled "WavePhore and the Canadian Broadcasting Corporation Enter an Agreement to Deliver Data Broadcasting Nationwide in Canada," dated Mar. 29, 1995.

(List continued on next page.)

Primary Examiner—-Victor R. Kostak

(74) Attorney, Agent, or Firm—-James L. Ewing, IV, Esq.;

Kilpatrick Stockton LLP

(57) ABSTRACT

A system for transmitting digital programming includes a program source providing digital information, circuitry for modulating the digital information onto a visual carrier modulated with analog television programming, and a visual transmitter coupled to the modulating circuitry. Using a phase modulation method, the system phase modulates the digital information onto a visual carrier, reduces the baseband frequencies ol the phase modulated visual carrier, and amplitude modulates the phase-modulated video carrier onto a video signal. The amplified and encoded video signal are combined with an amplified sound signal and transmitted. Using an additive method, the system modulates the sidebands of the video carrier with the digital information and amplitude modulates the video signal onto the video carrier. The data-modulated sidebands are phase-shifted such that they will be in quadrature with the amplitude-modulated video signal. The system combines the amplitude-modulated video carrier and the data-modulated quadrature sidebands. With a blended multiplicative/additive method, the system provides phase modulation and quadrature sideband addition to provide an optimized result. Process, systems, circuits and devices for abating or otherwise correcting effects of the information on the analog television signal are also disclosed.

20 Claims, 79 Drawing Sheets

Page 2

U.S. PATENT DOCUMENTS

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* cited by examiner