Title :
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
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;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1999. Proceedings., 1999 IEEE International Conference on
Conference_Location :
Phoenix, AZ
Print_ISBN :
0-7803-5041-3
DOI :
10.1109/ICASSP.1999.759863
