Université de Neuchâtel

Automatic sound detection and recognition for noisy environment

Dufaux, Alain ; Besacier, Laurent ; Ansorge, Michael ; Pellandini, Fausto

In: IEEE European Signal Processing Conference EUSIPCO, 2000, vol. 10, p. 1-4

This paper addresses the problem of automatic detection and recognition of impulsive sounds, such as glass breaks ,human screams, gunshots, explosions or door slams. A complete detection and recognition system is described and evaluated on a sound database containing more than 800 signals distributed among six different classes. Emphasis is set on robust techniques, allowing the use of this...

Université de Neuchâtel

A Low-Complexity Variable Bit Rate Speech Coder for Portable Storage Applications

Grassi, Sara ; Matthey, M. ; Biundo, Giuseppina ; Dufaux, Alain ; Ansorge, Michael ; Pellandini, Fausto

In: Proceedings of Signal Processing Workshop (SPW), 2000, p. 7-12

This paper describes ongoing work in the development of a variable bit rate speech coder for storage applications in portable devices. The coder is based on the CELP FS1016, with different algorithmic modifications aimed at reducing the computational complexity. A silence compression scheme was adapted to this coder, to achieve reduction in both the bit rate and the power consumption. The...

Université de Neuchâtel

Influence of GSM speech coding on the performance of text-independent speaker recognition

Grassi, Sara ; Besacier, Laurent ; Dufaux, Alain ; Ansorge, Michael ; Pellandini, Fausto

In: 10th European Signal Processing Conference (EUPSICO), 2000, vol. 1, p. 437-440

We have investigated the influence of GSM speech coding in the performance of a text-independent speaker recognition system based on Gaussian Mixture Models (GMM). The performance degradation due to the utilization of the three GSM speech coders was assessed, using three transcoded databases, obtained by passing the TIMIT through each GSM coder/decoder. The recognition performance was also...

Université de Neuchâtel

GSM speech coding and speaker recognition

Besacier, Laurent ; Grassi, Sara ; Dufaux, Alain ; Ansorge, Michael ; Pellandini, Fausto

In: Proceedings of the International Conference on Acoustics, Speech, and Signal Processing (ICASSP97), 2000, vol. 2, p. 1085-1088

This paper investigates the influence of GSM speech coding on text independent speaker recognition performance. The three existing GSM speech coder standards were considered. The whole TIMIT database was passed through these coders, obtaining three transcoded databases. In a first experiment, it was found that the use of GSM coding degrades significantly the identification and verification...

Université de Neuchâtel

Efficient algorithm to compute LSP parameters from 10th-order LPC coefficients

Grassi, Sara ; Dufaux, Alain ; Ansorge, Michael ; Pellandini, Fausto

In: Proceedings of the International Conference on Acoustics, Speech, and Signal Processing (ICASSP97), 1997, vol. 3, p. 1707-1710

Line Spectrum Pair (LSP) representation of Linear Predictive Coding (LPC) parameters is widely used in speech coding applications. An efficient method for LPC to LSP conversion is Kabal’s method. In this method the LSPs are the roots of two polynomials P'p(x) and Q'p(x), and are found by a zero crossing search followed by successive bisections and interpolation. The...

Université de Neuchâtel

Influence of GSM speech coding algorithms on the performance of text-independent speaker indentification

Grassi, Sara ; Besacier, Laurent ; Dufaux, Alain ; Ansorge, Michael ; Pellandini, Fausto

In: Proceedings of the International COST 254 Workshop on Intelligent Communication Technologies and Applications, with Emphasis on Mobile Communications, 1999, vol. 254, p. 307-311

This paper investigates the influence, on theperformance of a text-independent speaker identification system, of the three speech coding algorithmsstandardized for use in the GSM wireless communication network. The speaker identification system isbased on Gaussian Mixture Models (GMM) classifiers. Only the influence of the speech codingalgorithms was taken into account. This was done bypassing...

Université de Neuchâtel

Speaker recognition on compressed speech

Grassi, Sara ; Dufaux, Alain ; Besacier, Laurent ; Ansorge, Michael ; Pellandini, Fausto

In: Proceedings of the International COST 254 Workshop on Friendly Exchanging through the Net, 2000, vol. 254, p. 117-122

We have investigated the influence of GSM speechcoding in the performance of a text-independent speakerrecognition system based on Gaussian Mixture Models(GMM) classifiers.The performance degradation due to the utilization ofthe three GSM speech coders was first assessed, usingthree transcoded databases, obtained by passing theTIMIT through each GSM coder / decoder. The codeddatabases were used...