Quantization noise shaping method and apparatus

Details Quantization noise shaping method and apparatus Quantization noise shaping method and apparatus

2003-11-25

2008-05-13

{hacek over (S)}mits, Talivaldis Ivars (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

Psychoacoustic

C704S226000, C704S229000, C704S230000

Reexamination Certificate

active

07373293

ABSTRACT:
A method and apparatus for shaping quantization noise generated when compressing audio data at a low bit rate is disclosed. A predetermined quantization noise threshold allowed during quantization of sampled audio data and quantization noise energy information of a quantized MDCT coefficient are received in all frequency bands of an audio frequency. The quantization noise energy of the quantized MDCT coefficient is attenuated in a predetermined number of frequency bands in which a difference between the predetermined quantization noise threshold and the quantization noise energy of the quantized MDCT coefficient is large.

REFERENCES:
patent: 5757938 (1998-05-01), Akagiri et al.
patent: 5930750 (1999-07-01), Tsutsui
patent: 6138093 (2000-10-01), Ekudden et al.
patent: 6138101 (2000-10-01), Fujii
patent: 6456963 (2002-09-01), Araki
patent: 6466912 (2002-10-01), Johnston
patent: 6473731 (2002-10-01), Hinderks
patent: 6499010 (2002-12-01), Faller
patent: 6542865 (2003-04-01), Nagao et al.
patent: 6604069 (2003-08-01), Tsutsui
patent: 6697775 (2004-02-01), Kawahara
patent: 6725192 (2004-04-01), Araki
patent: 6915255 (2005-07-01), Watanabe
patent: 6950794 (2005-09-01), Subramaniam et al.
patent: 7080007 (2006-07-01), Son et al.
patent: 2002/0173948 (2002-11-01), Hilpert et al.
patent: 2003/0182104 (2003-09-01), Muesch
patent: 2004/0024588 (2004-02-01), Watson et al.
Najafzadeh, Hossein, “Perceptual Bit Allocation for Low Rate Coding of Narrowband Audio,” Jun. 2000, Procs. IEEE International Conference on Acoustics, Speech, and Signal Processing, pp. 893-896.

Affiliated with

Also associated with

Rating

Quantization noise shaping method and apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Quantization noise shaping method and apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Quantization noise shaping method and apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3982254