WO2001006755A3 - Improved stealthy audio watermarking - Google Patents

Improved stealthy audio watermarking Download PDF

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Publication number
WO2001006755A3
WO2001006755A3 PCT/US2000/019397 US0019397W WO0106755A3 WO 2001006755 A3 WO2001006755 A3 WO 2001006755A3 US 0019397 W US0019397 W US 0019397W WO 0106755 A3 WO0106755 A3 WO 0106755A3
Authority
WO
WIPO (PCT)
Prior art keywords
watermarking
audio
watermark
balance
another embodiment
Prior art date
Application number
PCT/US2000/019397
Other languages
French (fr)
Other versions
WO2001006755A2 (en
Inventor
Darko Kirovski
Henrique Malvar
Original Assignee
Microsoft 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
Application filed by Microsoft Corp filed Critical Microsoft Corp
Priority to AU61041/00A priority Critical patent/AU6104100A/en
Publication of WO2001006755A2 publication Critical patent/WO2001006755A2/en
Publication of WO2001006755A3 publication Critical patent/WO2001006755A3/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/28—Arrangements for simultaneous broadcast of plural pieces of information
    • H04H20/30—Arrangements for simultaneous broadcast of plural pieces of information by a single channel
    • H04H20/31—Arrangements for simultaneous broadcast of plural pieces of information by a single channel using in-band signals, e.g. subsonic or cue signal
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00884—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a watermark, i.e. a barely perceptible transformation of the original data which can nevertheless be recognised by an algorithm
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/913—Television signal processing therefor for scrambling ; for copy protection
    • H04N2005/91307—Television signal processing therefor for scrambling ; for copy protection by adding a copy protection signal to the video signal
    • H04N2005/91335—Television signal processing therefor for scrambling ; for copy protection by adding a copy protection signal to the video signal the copy protection signal being a watermark

Abstract

Described herein is audio watermarking technology for inserting and detecting watermarks in audio signals. The watermark identifies the content producer, providing a signature that is embedded in the audio signal and cannot be removed. In one embodiment, a watermarking system employs chess spread-spectrum sequences to improve the balance of positive and negative chips in the watermarking sequences. The balance is not imposed in an orderly fashion, but in a pseudo-random fashion. In that way, better sequence balance is achieved while preserving its randomness for an attacker without knowledge of the keys. In another embodiment, a watermarking system employs an energy-level trigger to determine whether to skip encoding of a portion of a watermark within a given time span of an audio clip. If a large discrepancy in energy levels exists over a given time frame, then the frame is not watermarked, to avoid audible time-dispersion of artifacts. In another embodiment, a watermarking system begins encoding of a watermark at a variable position after the beginning of an audio clip.
PCT/US2000/019397 1999-07-13 2000-07-13 Improved stealthy audio watermarking WO2001006755A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU61041/00A AU6104100A (en) 1999-07-13 2000-07-13 Improved stealthy audio watermarking

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US14343299P 1999-07-13 1999-07-13
US60/143,432 1999-07-13

Publications (2)

Publication Number Publication Date
WO2001006755A2 WO2001006755A2 (en) 2001-01-25
WO2001006755A3 true WO2001006755A3 (en) 2001-04-05

Family

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Family Applications (2)

Application Number Title Priority Date Filing Date
PCT/US2000/019397 WO2001006755A2 (en) 1999-07-13 2000-07-13 Improved stealthy audio watermarking
PCT/US2000/019481 WO2001005075A1 (en) 1999-07-13 2000-07-13 Improved audio watermarking with covert channel and permutations

Family Applications After (1)

Application Number Title Priority Date Filing Date
PCT/US2000/019481 WO2001005075A1 (en) 1999-07-13 2000-07-13 Improved audio watermarking with covert channel and permutations

Country Status (3)

Country Link
US (2) US7543148B1 (en)
AU (2) AU6104100A (en)
WO (2) WO2001006755A2 (en)

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Also Published As

Publication number Publication date
WO2001006755A2 (en) 2001-01-25
US7552336B2 (en) 2009-06-23
US7543148B1 (en) 2009-06-02
AU6104100A (en) 2001-02-05
US20050108542A1 (en) 2005-05-19
WO2001005075A1 (en) 2001-01-18
AU6351100A (en) 2001-01-30

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