Symbiotic automatic speech recognition and vocoder

Details Symbiotic automatic speech recognition and vocoder Symbiotic automatic speech recognition and vocoder

1997-10-31

2000-07-18

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704222, 704231, 704203, G10L 1902

Patent

active

060920394

ABSTRACT:
The device and method of the invention receives a digital speech signal, which is processed by an Acoustic Processor to produce a Mel-Cepstrum Vector and Pitch. This is recalibrated and encoded. The encoded signal is transmitted over a narrow-band Channel, then decoded, split and recalibrated. From the split signals, one signal feeds a Statistical Processor which produces Recognized Text. Another signal feeds a Regenerator, which produces Regenerated Speech. The device and method according to the invention achieve simultaneously very perceptive Automatic Speech Recognition and high quality VoCoding, using Speech communicated or stored via a Channel with narrow-bandwidth; very perceptive Automatic Speech Recognition on a Client & Server system without a need to store or to communicate wide-bandwidth Speech signals; very perceptive Automatic Speech Recognition with Deferred Review and Editing without storage of wide-bandwidth Speech signals; better feedback in a system for Automatic Speech Recognition particularly for Deferred Automatic Speech Recognition; and good usability for unified Automatic Speech Recognition and VoCoding.

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Imai et al., "A Direct Approximation Technique of Log Magnitude Response for Digital Filters," IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-25, No. 2, Apr. 1977.
Imai, "Low Bit Rate Cepstral Vocoder Using the Log Magnitude Approximation Filter," IEEE 1978, pp. 441-444.
Koishida et al., "CELP Coding Based on Mel-Cepstral Analysis," IEEE 1995, pp. 33-36.

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