Title :
DSP implementation and performance evaluation of sparse-tap adaptive FIR filters with tap-position control
Author :
Hirano, Akihiro ; Sugiyama, Akihiko ; Ikeda, Shigeji
Author_Institution :
Inf. Technol. Res. Labs., NEC Corp., Kawasaki, Japan
Abstract :
This paper presents the implementation and performance evaluation of sparse-tap adaptive FIR filters with tap-position control. For the reduction of computational costs, a small number of filter coefficients are assigned to significant regions in the impulse response. A floating-point digital signal processor (DSP) ADSP-21020 is used for the implementation. For one second of end-to-end delay and 32 milliseconds of total significant-region length, the number of computations is reduced to almost one-tenth compared with a full-tap FIR adaptive filter using the same DSP. Experimental results using a telephone network simulator show that the implemented echo canceller reduces the echo by almost 20 dB for both white-noise and real speech signals. Tracking performance for phase rolls and flat-delay changes is also examined
Keywords :
FIR filters; adaptive filters; adaptive signal processing; digital filters; digital signal processing chips; echo suppression; floating point arithmetic; speech processing; white noise; ADSP-21020; DSP implementation; computational costs reduction; echo canceller; echo reduction; experimental results; filter coefficients; flat delay; floating-point digital signal processor; impulse response; performance evaluation; phase rolls; real speech signals; sparse-tap adaptive FIR filters; tap-position control; telephone network simulator; tracking performance; white-noise; Adaptive control; Adaptive filters; Computational efficiency; Computational modeling; Delay; Digital signal processing; Digital signal processors; Finite impulse response filter; Programmable control; Telephony;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1996. ICASSP-96. Conference Proceedings., 1996 IEEE International Conference on
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-3192-3
DOI :
10.1109/ICASSP.1996.543663