Title :
An 8 kbps TC-MQ (time domain compression ADPCM-MQ) speech codec
Author :
Amano, Fumio ; Iseda, Kohei ; Okazaki, Koji ; Unagami, Shigeyuk
Author_Institution :
Fujitsu Lab. Ltd., Kawasaki, Japan
Abstract :
A new 8 kbps speech coding algorithm called TC-MQ (time domain compression ADPCM-MQ) is proposed. It is based on time scale modification and sub-band coding with the aid of ADPCM with a multiquantizer. For time scale modification, the decimation/interpolation technique is introduced for the unvoiced period. Furthermore, in order to get computational accuracy of the pitch extraction for the voiced period, a method using the normalized autocovariance function is proposed. The algorithm was confirmed by computer simulations. The segmental SNR was about 13-16 dB for Japanese short sentences. A good mean opinion score value was also obtained by means of a subjective evaluation test
Keywords :
codecs; encoding; speech analysis and processing; 8 kbit/s; Japanese short sentences; decimation/interpolation technique; mean opinion score value; multiquantizer; normalized autocovariance function; pitch extraction; segmental SNR; speech codec; speech coding algorithm; sub-band coding; subjective evaluation test; time domain compression ADPCM-MQ; time scale modification; Computer simulation; Equations; Error analysis; Hardware; Laboratories; Noise reduction; Quantization; Signal processing; Speech codecs; Speech coding;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1988. ICASSP-88., 1988 International Conference on
Conference_Location :
New York, NY
DOI :
10.1109/ICASSP.1988.196564
