Methods and apparatus for embedding codes in compressed audio data streams
First Claim
Patent Images
1. A method to embed a watermark in a compressed data stream, the method comprising:
- obtaining a set of transform coefficients from the compressed data stream, the set of transform coefficients comprising a set of mantissas and a set of scale factors; and
modifying, with a processor, a first one of the mantissas and a first one of the scale factors corresponding to a first transform coefficient from the set of transform coefficients based on a second mantissa and a second scale factor associated with a temporary watermarked transform coefficient to embed the watermark in the compressed data stream without uncompressing the compressed data stream.
12 Assignments
0 Petitions
Accused Products
Abstract
Methods and apparatus for embedding codes in compressed audio data streams are disclosed. An example apparatus disclosed herein to embed a code in a compressed audio data stream comprises an unpacking unit to determine a plurality of transform coefficients associated with the compressed audio data stream, the plurality of transform coefficients being represented by a respective plurality of mantissas and a respective plurality of scale factors, and an embedding unit to modify a mantissa in the plurality of mantissas and a corresponding scale factor in the plurality of scale factors to embed the code in the compressed audio data stream.
209 Citations
20 Claims
-
1. A method to embed a watermark in a compressed data stream, the method comprising:
-
obtaining a set of transform coefficients from the compressed data stream, the set of transform coefficients comprising a set of mantissas and a set of scale factors; and modifying, with a processor, a first one of the mantissas and a first one of the scale factors corresponding to a first transform coefficient from the set of transform coefficients based on a second mantissa and a second scale factor associated with a temporary watermarked transform coefficient to embed the watermark in the compressed data stream without uncompressing the compressed data stream. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A machine readable storage disk or a machine readable storage device comprising circuitry, the machine readable storage disk or storage device comprising machine readable instructions which, when executed, cause a machine to at least:
-
obtain a set of transform coefficients from a compressed data stream, the set of transform coefficients comprising a set of mantissas and a set of scale factors; and modify a first one of the mantissas and a first one of the scale factors corresponding to a first transform coefficient from the set of transform coefficients based on a second mantissa and a second scale factor associated with a temporary watermarked transform coefficient to embed a watermark in the compressed data stream without uncompressing the compressed data stream. - View Dependent Claims (9, 10, 11, 12, 13, 14)
-
-
15. An apparatus to embed a watermark in a compressed data stream, the apparatus comprising:
-
an unpacking unit to obtain a set of transform coefficients from the compressed data stream, the set of transform coefficients comprising a set of mantissas and a set of scale factors; and an embedding unit to modify a first one of the mantissas and a first one of the scale factors corresponding to a first transform coefficient from the set of transform coefficients based on a second mantissa and a second scale factor associated with a temporary watermarked transform coefficient to embed a watermark in the compressed data stream without uncompressing the compressed data stream, at least one of the unpacking unit or the embedding unit comprising hardware. - View Dependent Claims (16, 17, 18, 19, 20)
-
Specification