A switched parametric and transform audio coder

Author

Levine, Scott N. ; Smith, Julius O., III

Author_Institution

Dept. of Electr. Eng., Stanford Univ., CA, USA

Volume

2

fYear

1999

fDate

15-19 Mar 1999

Firstpage

985

Abstract

In this paper, we present a system of sines+transients+noise modeling techniques that dynamically switches between parametric representations and transform coding based representations. The sines and noise are represented by parametric models using multiresolution sinusoidal modeling and Bark-band noise modeling, respectively. The transients are modeled by short regions of transform coding. In addition, new methods are presented for selection and quantization of sinusoidal trajectories based on trajectory length and signal-to-masking thresholds. This system is useful for both low bitrate audio coding (20-40 kbps) and compressed-domain processing, such as time-scale modification

Keywords

audio coding; data compression; noise; parametric devices; signal representation; transform coding; transient analysis; 20 to 40 kbit/s; Bark-band noise modeling; compressed-domain processing; low bitrate audio coding; multiresolution sinusoidal modeling; noise modeling techniques; parametric representations; quantization; signal-to-masking thresholds; sines; sines+transients+noise modeling techniques; sinusoidal trajectories; switched parametric audio coder; time-scale modification; trajectory length; transform audio coder; transform coding based representations; transients; Bandwidth; Bit rate; Frequency; Instruments; Music; Psychoacoustic models; Quantization; Sampling methods; Switches; Transform coding;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 1999. Proceedings., 1999 IEEE International Conference on

Conference_Location

Phoenix, AZ

ISSN

1520-6149

Print_ISBN

0-7803-5041-3

Type

conf

DOI

10.1109/ICASSP.1999.759863

Filename

759863