In this paper, we introduce a novel method for quantization of line spectral frequencies (LSF) converted from mth order linear prediction coefficients. In the proposed method, the interframe correlation of LSFs is exploited using matrix quantization where N consecutive frames are quantized as one m-by-N matrix. The voicing-based multi-mode operation reduces the bit rate by taking advantage of t...

Bark-scale warped linear prediction [WLP] is a very potential core for a monophonic perceptual audio codec [2]. In the current paper the WLP scheme is extended for processing complex valued signals (CWLP). Three di erent methods of converting a stereo signal to one complex valued signal are introduced. The philosophy behind the coding scheme is to integrate some aspects of modern wideband audio...

This paper presents an approach to vector quantization of sources exhibiting intervector dependency. We present the optimal decoder based on a collection of received indices. We also present the optimal encoder for such decoding. The optimal decoder can be implemented as a table look-up decoder, however the size of the decoder codebook grows very fast with the size of the collection of utilized...

Robust speaker feature extraction under noise conditions is an important issue for application of a speaker recognition system. It is well known that LPC cepstrum, which expresses the spectral envelope, is e ective for speaker recognition. This implies that the spectral rough structure is e ective for speaker recognition. However, LPC cepstrum is a noise-sensitive feature. On the other hand, sp...

The denominator of a rational digital filter of nth order is a polynomial represented by a point A of the n-dimensional space of stability [ 6 ] , we can, for example, compute the reflection coefficients from vector a . which requires O ( n ’ / 2 ) numerical operations at each time. In addition, these coefficients can be updated from time sample to time sample in an adaptive filtering context [...

This paper represents a new hand shape representation technique that characterises the finger-only topology of the hand, by adapting an existing technique from speech signal processing. From a moving hand sequence, the tracking algorithm determines the centre of the largest convex subset of the hand, using a combination of pattern matching and condensation algorithms. A hand shape feature repre...

Segmentation of speech into syllables is beneficial for many spoken language processing applications since it provides information about phonological and rhythmic aspects of speech. Traditional methods usually detect syllable nuclei using features such as energies in critical bands, linear predictive coding spectra, pitch, voicing, etc. Here, a novel system that uses auditory attention cues is ...

Problem statement: In modern speech communication at low bit rate, speech coding deteriorates the characteristics of the coded speech significantly. Considering the dialects in Thai, the coding quality of four main dialects spoken by Thai people residing in four core region including central, north, northeast and south regions has not been studied. Approach: This study presents a comparative st...

Hypernasality (HP) is observed across voiced phonemes uttered by Cleft-Palate (CP) speakers with defective velopharyngeal (VP) opening. HP assessment using signal processing technique is challenging due to the variability of acoustic features across various conditions such as speakers, speaking style, speaking rate, severity of HP etc. Most of the study for hypernasality (HP) assessment is base...

A digital signal processor (DSP) based voice communication system for divers with a 2400 bitls transmission rate is described. Each speech signal frame is analysed using linear predictive coding (LPC) and the essential parameters such as amplitude, pitch period and digital filter coefficients are extracted. These parameters are transmitted through a water channel at a rate of 2400 bitls by empl...