CA2195037A1 - System and method for encoding digital information in a television signal - Google Patents

System and method for encoding digital information in a television signal

Info

Publication number
CA2195037A1
CA2195037A1 CA002195037A CA2195037A CA2195037A1 CA 2195037 A1 CA2195037 A1 CA 2195037A1 CA 002195037 A CA002195037 A CA 002195037A CA 2195037 A CA2195037 A CA 2195037A CA 2195037 A1 CA2195037 A1 CA 2195037A1
Authority
CA
Canada
Prior art keywords
encoded
data
frequency
video signal
digital information
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002195037A
Other languages
French (fr)
Other versions
CA2195037C (en
Inventor
Theodore Ii Sizer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AT&T Corp
Original Assignee
AT&T Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US08/599,500 external-priority patent/US5663766A/en
Application filed by AT&T Corp filed Critical AT&T Corp
Publication of CA2195037A1 publication Critical patent/CA2195037A1/en
Application granted granted Critical
Publication of CA2195037C publication Critical patent/CA2195037C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division
    • H04N7/081—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division the additional information signals being transmitted by means of a subcarrier
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division

Abstract

Digital information is encoded in the video portion of a television signal such that "n" (n is an integer) bits of the digital information are carried by each successive frame in a group of frames. The digital information is encoded by modulating a carrier signal, using, for example, either amplitude shift keying (ASK) or frequency shift keying (FSK), and the modulated carrier is then added to the video signal selectively, only in portions of the television program that (a) are not likely to be perceptible by a viewer, and (b) are of sufficient intensity to transmit the data.
The video signal including the encoded digital data, may be transmitted, in real time, to a television receiver, or recorded for later playback. In either event, at a receiver, when the video signal containing the encoded information is displayed on a screen, the image is sensed or "viewed" by a photo detector, the output of which is applied to a band pass filter having a center frequency that corresponds to the oscillator frequency(s) in the encoder. The filter output is thresholded or FM detected, so that the receiver can recover the encoded data. By appropriately including checks bits and synchronization patterns, the bit stream output from the decoder can be synchronized, and the original encoded data recovered. Advantageously, the frequency of the oscillator in the ASK or FSK encoder is chosen so that the energy added to the video signal is in a portion of the frequency spectrum that otherwise contains little energy. This makes the added digital data imperceptible to a viewer.
If desired, the same data may be repetitively encoded in several groups of frames, so as to increase the redundancy and thus the reliability of the overall system.
CA002195037A 1996-01-25 1997-01-14 System and method for encoding digital information in a television signal Expired - Fee Related CA2195037C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/599,500 US5663766A (en) 1994-10-31 1996-01-25 Digital data encoding in video signals using data modulated carrier signals at non-peaks in video spectra
US599,500 1996-01-25

Publications (2)

Publication Number Publication Date
CA2195037A1 true CA2195037A1 (en) 1997-07-26
CA2195037C CA2195037C (en) 2001-03-20

Family

ID=24399883

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002195037A Expired - Fee Related CA2195037C (en) 1996-01-25 1997-01-14 System and method for encoding digital information in a television signal

Country Status (2)

Country Link
US (1) US5929920A (en)
CA (1) CA2195037C (en)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE37991E1 (en) 1993-01-12 2003-02-18 Visual Automation Systems, Inc. Apparatus for tracking the flow of video signals by incorportating patterns of machine readable signals which will appear at predetermined locations of a television picture
US6614914B1 (en) 1995-05-08 2003-09-02 Digimarc Corporation Watermark embedder and reader
US7171016B1 (en) 1993-11-18 2007-01-30 Digimarc Corporation Method for monitoring internet dissemination of image, video and/or audio files
US6408082B1 (en) 1996-04-25 2002-06-18 Digimarc Corporation Watermark detection using a fourier mellin transform
US6611607B1 (en) 1993-11-18 2003-08-26 Digimarc Corporation Integrating digital watermarks in multimedia content
US6122403A (en) 1995-07-27 2000-09-19 Digimarc Corporation Computer system linked by using information in data objects
US6516079B1 (en) 2000-02-14 2003-02-04 Digimarc Corporation Digital watermark screening and detecting strategies
US6424725B1 (en) 1996-05-16 2002-07-23 Digimarc Corporation Determining transformations of media signals with embedded code signals
US6381341B1 (en) 1996-05-16 2002-04-30 Digimarc Corporation Watermark encoding method exploiting biases inherent in original signal
US6122322A (en) * 1996-11-19 2000-09-19 Telefonaktiebolaget Lm Ericsson Subliminal message protection
US6388712B1 (en) * 1997-10-09 2002-05-14 Kabushiki Kaisha Toshiba System for verifying broadcast of a commercial message
US7478240B1 (en) 2000-02-11 2009-01-13 Alcatel-Lucent Usa Inc. Method and system for capture of location specific media related information and delivery through communications network
US7057666B2 (en) 2000-10-24 2006-06-06 Harris Corporation System and method for encoding information into a video signal
US7650624B2 (en) * 2002-10-01 2010-01-19 Koplar Interactive Systems International, L.L.C. Method and apparatus for modulating a video signal with data
US7116374B2 (en) * 2003-08-26 2006-10-03 Koplar Interactive Systems International, L.L.C. Method and system for enhanced modulation of video signals
WO2005031634A1 (en) * 2003-08-29 2005-04-07 Nielsen Media Research, Inc. Methods and apparatus for embedding and recovering an image for use with video content
US7075583B2 (en) * 2003-10-20 2006-07-11 Koplar Interactive Systems International, L.L.C. Methods for improved modulation of video signals
US7594242B2 (en) * 2004-02-23 2009-09-22 The Nielsen Company (Us), Llc Methods and apparatus to detect an internally generated signal mode of a local media playback device
KR100791545B1 (en) * 2006-12-29 2008-01-04 (주)엘비티솔루션 Compression method for moving picture
KR20140086415A (en) * 2012-12-28 2014-07-08 삼성전기주식회사 Device of data communication using video and method of data communication using video

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2477816A1 (en) * 1980-03-04 1981-09-11 Telediffusion Fse TELEVISION SYSTEM USING AN IMAGE SUPERIOR CODE
US4807031A (en) * 1987-10-20 1989-02-21 Interactive Systems, Incorporated Interactive video method and apparatus
US4969041A (en) * 1988-09-23 1990-11-06 Dubner Computer Systems, Inc. Embedment of data in a video signal
US5200822A (en) * 1991-04-23 1993-04-06 National Broadcasting Company, Inc. Arrangement for and method of processing data, especially for identifying and verifying airing of television broadcast programs
US5243423A (en) * 1991-12-20 1993-09-07 A. C. Nielsen Company Spread spectrum digital data transmission over TV video

Also Published As

Publication number Publication date
US5929920A (en) 1999-07-27
CA2195037C (en) 2001-03-20

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Legal Events

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