Unit selection speech synthesis has become the most researched area in speech technology, as a result of its high-quality performance. There are many approaches about the key points in this technology, that is, the cost functions design, speech parameterisation and prosody estimation, but there is very little research about suitable methods for evaluating the improvements in synthetic speech. I...

Data augmentation is a common strategy adopted to increase the quantity of training data, avoid overfitting and improve robustness of the models. In this paper, we investigate audio-level speech augmentation methods which directly process the raw signal. The method we particularly recommend is to change the speed of the audio signal, producing 3 versions of the original signal with speed factor...

A GUI-based software tool that provides a framework for evaluation of di erent speech coding algorithms is presented. The tool is designed to measure the susceptibility of speech coding algorithms to errors added on the encoded bit-stream during transmission. In particular, the errors can be added individually to the parameters that comprise the encoded bit-stream. This enables a designer of a ...

A nonlinear Hammerstein model is proposed for coding speech signals. Using Tsay’s nonlinearity test, we first show that the great majority of speech frames contain nonlinearities (over 80% in our test data) when using 20-millisecond speech frames. Frame length correlates with the level of nonlinearity: the longer the frames the higher the percentage of nonlinear frames. Motivated by this result...

In this paper, a new method is presented that offers efficient computation of Linear Prediction Coefficients (LPC) via a new Recursive Least Squares (RLS) adaptive filtering algorithm. This method can be successfully used in speech coding and processing. The introduced algorithm is numerically robust, fast, parallelizable and has particularly good tracking properties. By means of this scheme, L...

Problem statement: Dialects of Thai are quite different in the speaking styles. Environmental noises play an important role in corrupting the communication speech quality. Two factors affect the coded speech in the present speech communication. It is necessary to investigate how the two factors influence on the speech compression. Approach: In this study, the Multi-Pulse based Code Excited Line...

This paper presents a novel method for estimating a vocal-tract spectrum from speech signals, based on a modeling of excitation signals of voiced speech. A formulation of linear prediction coding with impulse train is derived and applied to the phaseequalized speech signals, which are converted from the original speech signals by phase equalization. Preliminary results show that the proposed me...

In mobile communication systems, bandwidth is a precious commodity, and service providers are continuously faced with the challenge of accommodating more users within a limited allocated bandwidth. Linear Predictive Coding (LPC) offers low bit-rate speech coding that can be used to meet this challenge. The lower the bit rate at which the coder can deliver toll quality speech, the more speech ch...

Two experiments were conducted to determine whether visual speech presented in the visual periphery affects the perceived identity of speech sounds. Auditory speech targets (vCv syllables) were presented in noise (-8 dB) with congruent or incongruent visual speech presented in full-face or upper-half face conditions. Participants’ eye-movements were monitored to assure that visual speech input ...