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Low bit rate speech coding for practical applications
An improved implementation of Adaptive Quantizers for Speech
Development of a Speech Codec for the Skyphone Service
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acoustic adaptive quantizer ADPCM algorithm allophones analysis applications approximation audio backward adaptive band bit rate speech block British Telecom BTRL CCITT CELP Chebyshev polynomials codebook coder coefficients database decoder digital signal processing distortion encoder equation error example excitation filter formant frequency function Hanning window input pattern kbit/s layer listening level low bit rate module multipulse n-tuple natural speech neural array neuron noise non-linear normalisation operation output parameters perceptron performance phoneme polynomial positions and amplitudes predictor problem Proc produced pulse amplitude pulse positions range rate speech codecs sample schemes segment sequence shown in Fig signal processing Skyphone SLLUP sounds speaker spectral components spectrum speech codecs speech production speech quality speech recognition speech signal sub-band sub-band coding synthesiser t-domain techniques telephone trajectory transmission utterance values vector quantization vocal tract vocoder voice vowel waveform window word