Intelligibility Improvement of Low Bit-Rate Speech Coder Using Stochastic Spectral Equalizer

Hybrid transform coder for low bit rate speech coding

A low bit rate speech coder based on Gaussian adaptivewaveletsShubha

A low bit rate speech coder based on Gaussian adaptive wavelets is described. This speech coder ameliorates the problem of using two diierent mother wavelets to model voiced and unvoiced sounds as mentioned in. 1 In addition, it has been demonstrated in this paper, that Gaussian adaptive wavelets are better suited to model both voiced and unvoiced sounds as compared to Morlet and Daubechies' wa...

TTS based very low bit rate speech coder

This paper addresses a speech coder which uses a Text-To-Speech (TTS) synthesis system to achieve very low bit rates (sub lkbps). The main issue of the work is the accurate coding of the pitch(f0) and gain contours which are principle components of prosody. This is of paramount interest since the correct prosody will increase naturalness and an efficient coding scheme will provide high coding g...

A very low bit rate speech coder using HMM-based speech recognition/synthesis techniques

This paper presents a very low bit rate speech coder based on HMM (Hidden Markov Model). The encoder carries out phoneme recognition, and transmits phoneme indexes, state durations and pitch information to the decoder. In the decoder, phoneme HMMs are concatenated according to the phoneme indexes, and a sequence of mel-cepstral coefficient vectors is generated from the concatenated HMM by using...

A very low bit rate speech coder using HMM with speaker adaptation

This paper describes a speaker adaptation technique for a phonetic vocoder based on HMM. In the vocoder, the encoder performs phoneme recognition and transmits phoneme indexes and state durations to the decoder, and the decoder synthesizes speech using HMM-based speech synthesis technique. One of the main problems of this vocoder is that the voice characteristics of synthetic speech depend on H...