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 Title: |
US5940135:
Apparatus and method for encoding and decoding information in analog signals
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Petrovic, Rade; Wilmington, MA
Winograd, Joseph M.; Cambridge, MA
Jemili, Kanaan; Woburn, MA
Metois, Eric; Somerville, MA
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| Assignee: |
Aris Technologies, Inc., Cambridge, MA
other patents from ARIS TECHNOLOGIES, INC. (742578) (approx. 4)
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| Published / Filed: |
1999-08-17
/ 1997-05-19
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| Application Number: |
US1997000858562
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| IPC Code: |
Advanced:
G06T 1/00;
H04H 20/31;
Core:
more...
IPC-7:
H04N 7/087;
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| ECLA Code: |
H04H20/31; G06T1/00W2;
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| U.S. Class: |
Current:
348/473;
341/139;
348/469;
380/202;
380/253;
705/058;
725/151;
Original:
348/473;
348/469;
348/907;
348/001;
380/006;
455/002;
341/139;
375/209;
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| Field of Search: |
348/473,614,1,469,907
375/209
380/006
455/002
341/139
H04N 7087
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| Priority Number: |
| 1997-05-19 |
US1997000858562 |
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| Abstract: |
Apparatus and methods are provided for encoding, storing and decoding auxiliary information on an analog source signal in a way which has minimal impact on the human perception of the source information when the source signal is applied to an appropriate output device, such as a speaker or a display monitor. The autocorrelation function of a host signal is modulated according to the value of an auxiliary information signal by adding a host modifying signal to the host signal. The auxiliary signal is decoded by generating the autocorrelation function of the encoded signal and extracting the auxiliary signal according to well-known signal extraction techniques.
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| Attorney, Agent or Firm: |
Rothwell, Figg, Ernst & Kurz ;
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| Primary / Asst. Examiners: |
Peng, John K.; Desir, Jean W.
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| INPADOC Legal Status: |
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Family Legal Status Report
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| Designated Country: |
CA EP JP KR
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| Family: |
Show 26 known family members
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First Claim:
Show all 27 claims |
What is claimed is:
1. A method for encoding information symbols onto an analog host signal, comprising the steps of:
- determining a short-term autocorrelation function value of said host signal;
- determining a value of an auxiliary information signal containing an information symbol;
- calculating a value of the short-term autocorrelation function of said host signal corresponding to said determined value of said auxiliary information signal according to a predefined relationship between auxiliary information signal value and host signal autocorrelation value;
- developing a host modifying signal for modifying said host signal such that the short-term autocorrelation function value of the modified host signal will correspond to said calculated value; and
- modifying said host signal with said host modifying signal.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 82 U.S. patent(s) that reference this one
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