Methods and apparatus to perform audio watermarking and watermark detection and extraction
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United States of America Patent
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Oct 4, 2016
Issued Date -
N/A
app pub date -
Dec 28, 2012
filing date -
Nov 12, 2007
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Encoding and decoding methods and apparatus are described to obtain auxiliary information from an audio signal. The auxiliary information uses a plurality of frequency components residing in a plurality of code bands. The audio signal is transformed into a frequency domain representation. Characteristics of frequencies of the frequency domain representation that may contain the auxiliary information are determined. The characteristics of frequencies of the frequency domain representation in a respective one of the code bands that may contain the auxiliary information are normalized across the code band. The normalization is carried out against a characteristic of a frequency in that code band. The normalized characteristics of the frequencies representative of auxiliary information are summed to determine a sum for a frequency representative of auxiliary information. It is determined when the sum is representative of the auxiliary information.
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Patent Citation Ranking
- 8 Citation Count
- H04N Class
- 14.12 % this patent is cited more than
- 9 Age
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|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Apr 4, 2028 |
