1. An 8 kbps TC-MQ (time domain compression ADPCM-MQ) speech codec
- Author
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Fumio Amano, Shigeyuki Unagami, Koji Okazaki, and Kohei Iseda
- Subjects
Decimation ,Voice activity detection ,Adaptive Multi-Rate audio codec ,Codec2 ,Computer science ,Mean opinion score ,Speech recognition ,Speech coding ,Codec ,PSQM ,Time domain - 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. >
- Published
- 2003
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