An 8 kbps TC-MQ (time domain compression ADPCM-MQ) speech codec

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...

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Bibliographic Details
Main Authors: Amano, F., Iseda, K., Okazaki, K., Unagami, S.
Format: Conference Proceeding
Language:English
Subjects:
Computer simulation
Equations
Error analysis
Hardware
Laboratories
Noise reduction
Quantization
Signal processing
Speech codecs
Speech coding
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Summary: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.< >
ISSN:1520-6149
2379-190X
DOI:10.1109/ICASSP.1988.196564