Title :
New speech enhancement techniques for low bit rate speech coding
Author :
Martin, Rashad ; Cox, Richard V.
Author_Institution :
Speech & Image Process. Services Res. Lab., AT&T Labs.-Res., Florham Park, NJ, USA
Abstract :
In this paper we present novel solutions for pre-processing noisy speech prior to low bit rate speech coding. We strive especially to improve the estimation of spectral parameters and to reduce the additional algorithmic delay caused by the enhancement pre-processor. While the former is achieved using a new adaptive limiting algorithm for the a priori signal-to-noise ratio (SNR) estimate, the latter makes use of a novel overlap/add scheme. Our enhancement techniques were evaluated in conjunction with the 2400 bps mixed excitation linear prediction (MELP) coder by means of formal and informal listening tests
Keywords :
linear predictive coding; parameter estimation; spectral analysis; speech coding; speech enhancement; 2.4 kbit/s; MELP coder; SNR estimate; adaptive limiting algorithm; algorithmic delay reduction; formal listening tests; informal listening tests; low bit rate coding; mixed excitation linear prediction; noisy speech pre-processing; overlap/add scheme; signal-to-noise ratio; spectral parameters estimation; speech coding; speech enhancement techniques; Added delay; Bit rate; Code standards; Data mining; Delay estimation; Linear predictive coding; Parameter estimation; Speech coding; Speech enhancement; Speech processing;
Conference_Titel :
Speech Coding Proceedings, 1999 IEEE Workshop on
Conference_Location :
Porvoo
Print_ISBN :
0-7803-5651-9
DOI :
10.1109/SCFT.1999.781519
