This paper describes a new formant analysis technique whereby the formant parameters are represented in the form of Gaussian mixture distributions. These are estimated from the Discrete Fourier Transform (DFT) magnitude spectrum of the speech signal. The parameters obtained are the means, variances and the masses of the density functions, which are used to calculate centre frequencies, bandwidt...

This document specifies the packetization scheme for encapsulating the 12-bit nonlinear, 20-bit linear and 24-bit linear audio data streams into a payload of the Real-time Transport Protocol (RTP). This draft also specifies the way of SDP announcement, when the audio data is preemphasized before sampling. The treatment of preemphasized audio data specified this document could be used in other a...

This study proposes two new methods for detailed modeling and transformation of the vocal tract spectrum and the pitch contour. The first method (selective pre-emphasis) relies on band-pass filtering to perform vocal tract transformation. The second method (segmental pitch contour model) focuses on a more detailed modeling of pitch contours. Both methods are utilized in the design of a voice co...

Obtaining a compact, information-rich representation of the speech signal is an important first step in ASR. A large majority of ASR systems use some form of cepstral coefficients for this purpose. Computation of these cepstral coefficients typically includes several of the following steps: (1) Highfrequency preemphasis, using an FIR filter of the form y(k) = x(k) ax(k-1), with a taking values ...

The GCI detection is a common problem in voice analysis used for voice transformation and synthesis. The proposed innovative idea is to use a glottal shape estimate and a standard lips radiation model instead of the common pre-emphasis when computing the vocal-tract filter estimate. The time-derivative glottal source is then computed from the division in frequency of the speech spectrum by the ...

This is a report summarising results from studies of true subglottal pressure, supraglottal pressure and speech wave data. We have derived co-variation patterns, which allow a prediction of intensity from subglottal pressure and F0, and conversely a prediction of a subglottal pressure contour from F0 and intensity. Of special interest is the significance of a mid-point in a speakers’ available ...

This document specifies a packetization scheme for encapsulating 12-bit nonlinear, 20-bit linear, and 24-bit linear audio data streams using the Real-time Transport Protocol (RTP). This document also specifies the format of a Session Description Protocol (SDP) parameter to indicate when audio data is preemphasized before sampling. The parameter may be used with other audio payload formats, in p...