Title :
Digital filters for high performance audio delta-sigma analog-to-digital and digital-to-analog conversions
Author :
Lin, Kun ; Zhao, Kan ; Chui, Edmund ; Krone, Andrew ; Nohrden, Jim
Author_Institution :
Crystal Semicond. Corp., Austin, TX, USA
Abstract :
A multi-stage decimation filter is described which consists of comb filters and a single-stage finite impulse response (FIR) filter. A multi-rate comb filter structure is used to reduce the data path width. A multi-stage interpolation filter consists of a half-band filter and a short FIR filter. The short FIR filter is designed with a nonlinear phase to realize an overall constant group delay-signal path. The coefficients of the FIR filters are optimally quantized to canonical-signed-digit form to realize multiplier-free (shift-and-add) filter implementations
Keywords :
FIR filters; audio equipment; audio signals; delays; digital filters; digital-analogue conversion; filtering theory; interpolation; nonlinear filters; sigma-delta modulation; analog to digital conversion; audio delta-sigma ADC; audio delta-sigma DAC; canonical signed digit coefficients; constant group delay-signal path; data path width reduction; digital filters; digital to analog conversion; filter coefficients; half-band filter; multiplier free filter; multirate comb filters; multistage decimation filter; multistage interpolation filter; nonlinear phase filter; shift and add filter; short FIR filter; single stage finite impulse response filter; single-stage finite impulse response; Delta-sigma modulation; Digital filters; Digital-analog conversion; Finite impulse response filter; Frequency; Interpolation; Logic; Nonlinear filters; Quantization; Sampling methods;
Conference_Titel :
Signal Processing, 1996., 3rd International Conference on
Conference_Location :
Beijing
Print_ISBN :
0-7803-2912-0
DOI :
10.1109/ICSIGP.1996.566972
