Title :
Companding Digital Signal Processors
Author :
Klein, Ari ; Tsividis, Yannis
Author_Institution :
Dept. of Electr. Eng., Columbia Univ., New York, NY
Abstract :
We discuss a technique whereby internal signals in a DSP can be controlled externally without causing output disturbances. This is used to extend the technique of companding (compressing and expanding), widely used in transmission and sound recording, to digital signal processors. It is shown that this technique allows all signals involved, including those at the input of an analog-to-digital converter and those internal to a fixed-point DSP, to be close to full scale, thus spanning most of the available bits and making possible a large signal-to-noise-plus-distortion ratio over a large input range
Keywords :
data compression; encoding; quantisation (signal); analog-to-digital converter; companding; digital signal processors; fixed-point DSP; internal signals; signal-to-noise-plus-distortion ratio; Acoustic noise; Analog-digital conversion; Digital recording; Digital signal processing; Digital signal processors; Digital-analog conversion; Dynamic range; Fixed-point arithmetic; Noise level; Signal restoration;
Conference_Titel :
Acoustics, Speech and Signal Processing, 2006. ICASSP 2006 Proceedings. 2006 IEEE International Conference on
Conference_Location :
Toulouse
Print_ISBN :
1-4244-0469-X
DOI :
10.1109/ICASSP.2006.1660750