Title :
Performance evaluation of a DSP-based teleconferencing system
Author :
Tahernezhadi, M. ; Sosale, D.
Author_Institution :
Dept. of Electr. Eng., Northern Illinois Univ., DeKalb, IL, USA
fDate :
11/1/1994 12:00:00 AM
Abstract :
Simulation and real time results associated with acoustic and line echo cancellation for a full-duplex teleconferencing system are presented. Both broadband (conventional) and subband finite impulse response (FIR) adaptive acoustic echo cancellers are considered. In subband scheme, quadrature mirror filters (QMF) are employed in order to construct an eight subband acoustic echo canceler. The normalized mean square (NLMS) is employed for updation of adaptive filter coefficients. Real time digital signal processing is conducted on a floating-point DSP chip in order to assess the dB cancellation of acoustic echo and line echo cancellers
Keywords :
FIR filters; acoustic signal processing; adaptive signal processing; digital signal processing chips; echo suppression; filtering theory; performance evaluation; quadrature mirror filters; teleconferencing; NLMS; QMF; acoustic echo cancellers; adaptive acoustic echo cancellers; adaptive filter coefficients; broadband finite impulse response; digital signal processing; floating-point DSP chip; line echo cancellers; normalized mean square; performance evaluation; quadrature mirror filter; real time results; simulation results; subband finite impulse response; teleconferencing system; Adaptive filters; Digital signal processing chips; Echo cancellers; Finite impulse response filter; Microphones; Mirrors; Real time systems; Sampling methods; Teleconferencing; Telephony;
Journal_Title :
Consumer Electronics, IEEE Transactions on
