Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission
Reexamination Certificate
2006-05-23
2006-05-23
Chawan, Vijay B. (Department: 2654)
Data processing: speech signal processing, linguistics, language
Speech signal processing
For storage or transmission
C704S233000, C704S230000, C704S229000
Reexamination Certificate
active
07050972
ABSTRACT:
An apparatus for encoding an audio signal to obtain an encoded audio signal to be used by a decoder having a high frequency reconstruction module for performing a high frequency reconstruction for a frequency range above a crossover frequency includes, a core encoder for encoding a lower frequency band of the audio signal up to the crossover frequency, the crossover frequency being variable, and the core encoder being operable on a block-wise frame by frame basis, and a crossover frequency control module for estimating, dependent on a measure of the degree of difficulty for encoding the audio signal by the core encoder and/or a boarder between a tonal and a noise-like frequency range of the audio signal, the crossover frequency to be selected by the core encoder for a frame of a series of subsequent frames, so that the crossover frequency is variable adaptively over time for the series of subsequent frames.
REFERENCES:
patent: 4158751 (1979-06-01), Bode
patent: 4896362 (1990-01-01), Veldhuis et al.
patent: 5285498 (1994-02-01), Johnston
patent: 5404377 (1995-04-01), Moses
patent: 5646961 (1997-07-01), Shoham et al.
patent: 5928342 (1999-07-01), Rossum et al.
patent: 6385548 (2002-05-01), Ananthaiyer et al.
patent: 6424939 (2002-07-01), Herre et al.
patent: 6490562 (2002-12-01), Kamai et al.
patent: 6757395 (2004-06-01), Fang et al.
patent: 2002/0116197 (2002-08-01), Erten
patent: WO 98/57436 (1998-12-01), None
Taniguchi et al (“A High-Efficiency Speech Coding Algorithm based on ADPCM with Multi-Quantizer”, International Conference on Acoustics, Speech, and Signal Processing, Apr. 1986).
Hollier (“Error Activity And Error Entropy As A Measure Of Psychoacoustic Significance In The Perceptual Domain”, IEE Proceedings—Vision, Image and Signal Processing, Jun. 1994).
Vinay et al (“Context-Based Error Recovery Technique for GSM AMR Speech Codec”, International Conference on Acoustics, Speech, and Signal Processing, May 2002).
Taniguchi, T. et al., A High-Efficiency Speech Coding Algorithm based on ADPCM with Multi-Quantizer, ICASSP 86 Proceedings, Apr. 7-11, 1986, pp. 1721-1724, vol. 3 of 4, Japan.
Paulus, J., 16 KBIT/S Wideband Speech Coding Based on Unequal Subbands, 1996 IEEE International Conference on Acoustics, Speech, and Signal Processing, 1996, pp. 255-258, vol. 1.
Zemouri, R. et al., Design of a Sub-Band Coder for Low-Bit Rate Using Fixed and Variable Band Coding Schemes, 20thInternatiional Conference on Industrial Electronics, Control and Instrumentation, 1994, IECON '94, pp. 1901-1906, vol. 3.
Schnitzler J., A 13.0 KBIT/S Wideband Speech Codec Based on SB-ACELP, Proceedings of the 1998 International Conference on Acoustics, Speech and Signal Processing, 1998, pp. 157-160, vol. 1.
AAC-Standard, ISO/IEC 13818-7;1997 (E), pp. 95-126.
Zwicker, E. et al., Psychoacoustics—Facts and Models, 1990, pp. 204-207 & 316-319, Springer-Verlag, Berlin.
Ehret Andrea
Henn Fredrik
Schug Michael
Chawan Vijay B.
Coding Technologies AB
LandOfFree
Enhancing the performance of coding systems that use high... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Enhancing the performance of coding systems that use high..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Enhancing the performance of coding systems that use high... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3611915