Source: https://patents.google.com/patent/US8078301?oq=7%2C339%2C580
Timestamp: 2018-03-25 02:39:52
Document Index: 146307094

Matched Legal Cases: ['art=40', 'art=0', 'Application No. 2', 'Application No. 04776572', 'Application No. 05780308', 'Application No. 2005270105', 'Application No. 2004258470', 'Application No. 2010200873', 'Application No. 2004258470', 'Application No. 10', 'Application No. 200480020200', 'Application No. 200580026107', 'Application No. 201010501205', 'Application No. 200480020200', 'Application No. 200580026107', 'Application No. 93117000', 'Application No. 93117000']

US8078301B2 - Methods and apparatus for embedding codes in compressed audio data streams - Google Patents
US8078301B2
US8078301B2 US11870275 US87027507A US8078301B2 US 8078301 B2 US8078301 B2 US 8078301B2 US 11870275 US11870275 US 11870275 US 87027507 A US87027507 A US 87027507A US 8078301 B2 US8078301 B2 US 8078301B2
US11870275
US20080091288A1 (en )
Instead of using the first simple approach described above to modify scale factors for embedding imperceptible watermarks, at block 840 the embedding unit 440 modifies the “exp” and “frac” parts of the scale factor Sk to provide finer resolution for embedding the watermark while limiting the increase in the bit rate for the watermarked compressed audio data stream. In particular, at block 840 the embedding unit 440 will modify the “exp” and/or “frac” parts of the scale factor Sk obtained at block 830 to decrease the scale factor by a unit of resolution. Continuing with the preceding example, the scale factor obtained at block 830 was Sk=160. This corresponded to an “exp” part=40 and a “frac” part=0. At block 840, the embedding unit 440 will decrease the scale factor by 1 (a unit of resolution) to yield Sk=160−1=159. The “exp” and “frac” parts for the scale factor Sk=159 are xk=└Sk/R┘=└159/4┘=39 and ck=Sk%R=159%4=3, respectively. An “exp” part equal to 39 returns a corresponding step size of 16384 from the “exp” lookup table as discussed above. The “frac” part equal to 3 returns a multiplier of, for example, 1.6799 from the “frac” lookup table. The resulting actual step size corresponding to the modified scale factor Sk=159 is, thus, 1.6799×16384=27525. With reference to the preceding example, if the four adjacent uncompressed MDCT coefficients formed by processing the uncompressed digital data stream 300 with an MDCT transform were quantized with the modified scale factor Sk=159, the resulting quantized integer mantissas would be:
US11870275 2006-10-11 2007-10-10 Methods and apparatus for embedding codes in compressed audio data streams Active 2030-06-11 US8078301B2 (en)
US85074506 true 2006-10-11 2006-10-11
US11870275 US8078301B2 (en) 2006-10-11 2007-10-10 Methods and apparatus for embedding codes in compressed audio data streams
US13250354 US8972033B2 (en) 2006-10-11 2011-09-30 Methods and apparatus for embedding codes in compressed audio data streams
US14631395 US9286903B2 (en) 2006-10-11 2015-02-25 Methods and apparatus for embedding codes in compressed audio data streams
US13250354 Continuation US8972033B2 (en) 2006-10-11 2011-09-30 Methods and apparatus for embedding codes in compressed audio data streams
US8078301B2 true US8078301B2 (en) 2011-12-13
US11870275 Active 2030-06-11 US8078301B2 (en) 2006-10-11 2007-10-10 Methods and apparatus for embedding codes in compressed audio data streams
US13250354 Active 2029-06-13 US8972033B2 (en) 2006-10-11 2011-09-30 Methods and apparatus for embedding codes in compressed audio data streams
US14631395 Active US9286903B2 (en) 2006-10-11 2015-02-25 Methods and apparatus for embedding codes in compressed audio data streams
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