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US6427012B1
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Apparatus and method for embedding and extracting information in analog signals using replica modulation
Assignee: VERANCE Corp (DELAWARE CORPORATION)
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Filing: 1998-06-29
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Granted: 2002-07-30
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Expires: 2018-06-29
Abstract
Abstract Apparatus and methods are provided for embedding or encoding auxiliary signals into an analog host or cover signal. A replica of the cover signal or a portion of the cover signal in a particular domain (time, frequency or space) is generated according to a stego key specifying modification values to specified parameters of the cover signal. The replica signal is then modified by an auxiliary signal corresponding to the information to be embedded, and inserted back into the cover signal. Embedded auxiliary signals are extracted by generating replicas of received signals and correlating the replicas with the received signals.
Inventors
- 👤 Rade Petrovic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:18
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/02; G11B27/031; G06; G06T; G06T1/00; G06T1/0021; G06T1/0028; G06F; G06F21/00; G06F21/60; G11B20/00; G11B20/10; G11B20/10009; G11B20/10046; G11B20/10222; H; H04; H04H; H04H20/00; H04H20/28; H04H20/30; H04H20/31; G06T2201/00; G06T2201/005; G06T2201/0052
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
66 words
A method for embedding an auxiliary signal in an analog cover signal, comprising the steps of: generating a replica signal from said cover signal by modifying at least a portion of said cover signal in a predetermined domain according to a stego key; modifying said replica signal as a function of said auxiliary signal; and inserting the modified replica signal back into said analog cover signal.
Claim 2
Independent Claim
66 words
A method for embedding an auxiliary signal in an analog cover signal, comprising the steps of: generating a replica signal from said cover signal by modifying at least a portion of said cover signal in a predetermined domain according to a stego key; modifying said replica signal as a function of said auxiliary signal; and inserting the modified replica signal back into said analog cover signal.
Claim 3
Dependent Claim
15 words
A method according to claim 1 , wherein said predetermined domain is the frequency domain.
Claim 4
Dependent Claim
15 words
A method according to claim 1 , wherein said predetermined domain is the time domain.
Claim 5
Dependent Claim
15 words
A method according to claim 1 , wherein said predetermined domain is the spatial domain.
Claim 6
Dependent Claim
36 words
A method according to claim 1 , wherein said replica signal is obtained by shifting the frequency of said at least one portion of said cover signal by a predefined amount specified by said stego keys.
Claim 7
Dependent Claim
36 words
A method according to claim 1 , wherein said replica signal is obtained by shifting the phase of said at least one portion of said cover signal by a predefined amount specified by said stego key.
Claim 8
Dependent Claim
36 words
A method according to claim 1 , wherein said replica signal is obtained by shifting the amplitude of said at least one portion of said cover signal by a predefined amount specified by said stego key.
Claim 9
Dependent Claim
42 words
A method according to claim 1 , wherein said replica signal is obtaining by shifting a predetermined combination of the frequency, phase, and/or amplitude of said at least one portion of said cover signal by predefined amounts specified by said stego key.
Claim 10
Dependent Claim
24 words
A method according to claim 1 , wherein the step of modifying comprises the step of multiplying said replica signal with said auxiliary signal.
Claim 11
Independent Claim
67 words
A method for extracting an embedded auxiliary signal from an analog stego signal, comprising the steps of: generating a replica signal from said stego signal by modifying at least a portion of said stego signal in a predetermined domain according to a stego key; modifying said stego signal as a function of said replica signal; and extracting said embedded auxiliary signal by filtering said modified stego signal.
Claim 12
Independent Claim
67 words
A method for extracting an embedded auxiliary signal from an analog stego signal, comprising the steps of: generating a replica signal from said stego signal by modifying at least a portion of said stego signal in a predetermined domain according to a stego key; modifying said stego signal as a function of said replica signal; and extracting said embedded auxiliary signal by filtering said modified stego signal.
Claim 13
Dependent Claim
15 words
A method according to claim 10 , wherein said predetermined domain is the frequency domain.
Claim 14
Dependent Claim
15 words
A method according to claim 10 , wherein said predetermined domain is the time domain.
Claim 15
Dependent Claim
15 words
A method according to claim 10 , wherein said predetermined domain is the spatial domain.
Claim 16
Dependent Claim
36 words
A method according to claim 10 , wherein said replica signal is obtained by shifting the frequency of said at least one portion of said stego signal by a predefined amount specified by said stego key.
Claim 17
Dependent Claim
36 words
A method according to claim 10 , wherein said replica signal is obtained by shifting the phase of said at least one portion of said stego signal by a predefined amount specified by said stego key.
Claim 18
Dependent Claim
36 words
A method according to claim 10 , wherein said replica signal is obtained by shifting the amplitude of said at least one portion of said stego signal by a predefined amount specified by said stego key.
Claim 19
Dependent Claim
43 words
A method according to claim 10 , wherein said replica signal is obtained by shifting a predetermined combination of the frequency, phase and/or amplitude of said at least one portion of said stego signal by a predefined amount specified by said stego key.
Claim 20
Dependent Claim
24 words
A method according to claim 10 , wherein the step of modifying comprises the step of multiplying said replica signal with said stego signal.
Claim 21
Dependent Claim
121 words
Apparatus for embedding and extracting auxiliary signals in an analog cover signal, comprising: means for generating a replica signal from said cover signal, by modifying at least a portion of said cover signal in a predetermined domain according to a stego key; means for modifying said replica signal as a function of said auxiliary signal; means inserting the modified replica signal back into said analog cover signal to produce a stego signal; means for receiving said stego signal; means for generating a replica signal from said stego signal; means for modifying said received stego signal as a function of said replica signal of said received stego signal; and means for extracting said auxiliary signal by filtering said modified received stego signal.
Claim 22
Dependent Claim
121 words
Apparatus for embedding and extracting auxiliary signals in an analog cover signal, comprising: means for generating a replica signal from said cover signal, by modifying at least a portion of said cover signal in a predetermined domain according to a stego key; means for modifying said replica signal as a function of said auxiliary signal; means inserting the modified replica signal back into said analog cover signal to produce a stego signal; means for receiving said stego signal; means for generating a replica signal from said stego signal; means for modifying said received stego signal as a function of said replica signal of said received stego signal; and means for extracting said auxiliary signal by filtering said modified received stego signal.
Claim 23
Dependent Claim
14 words
Apparatus according to claim 19 , wherein said predetermined domain is the frequency domain.
Claim 24
Dependent Claim
14 words
Apparatus according to claim 19 , wherein said predetermined domain is the time domain.
Claim 25
Dependent Claim
14 words
Apparatus according to claim 19 , wherein said predetermined domain is the spatial domain.
Claim 26
Dependent Claim
35 words
Apparatus according to claim 19 , wherein said replica signal is obtained by shifting the frequency of said at least one portion of said cover signal by a predefined amount specified by said stego key.
Claim 27
Dependent Claim
35 words
Apparatus according to claim 19 , wherein said replica signal is obtained by shifting the phase of said at least one portion of said cover signal by a predefined amount specified by said stego key.
Claim 28
Dependent Claim
35 words
Apparatus according to claim 19 , wherein said replica signal is obtained by shifting the amplitude of said at least one portion of said cover signal by a predefined amount specified by said stego key.
Claim 29
Dependent Claim
41 words
Apparatus according to claim 19 , wherein said replica signal is obtaining by shifting a predetermined combination of the frequency, phase, and/or amplitude of said at least one portion of said cover signal by predefined amounts specified by said stego key.
Claim 30
Dependent Claim
25 words
Apparatus according to claim 19 , wherein said means for modifying said replica signal comprises means for multiplying said replica signal with said auxiliary signal.
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