Perceptual audio coders use an estimated masked threshold for the determination of the maximum permissible just-inaudible noise level introduced by quantization. This estimate is derived from a psychoacoustic model mimicking the properties of masking. Most psychoacoustic models for coding applications use a uniform (equal bandwidth) spectral decomposition as a first step to approximate the freq...

This paper describes a new design of a psychoacoustic model for audio coding following the model used in the standard MPEG-1 audio layer 3 using an appropriate wavelet packet decomposition of the speech/audio signal. The design of a psychoacoustic model is achieved by wavelet packet decomposition whose connections are selected in such a way that sub bands correspond to the best possible one to ...

Spectral sharpening of speech has been proposed as a possible method for improving speech understanding by listeners with hearing loss. Animal neural physiological data and cochlear models differ in their predictions as to the potential success of spectral sharpening for improved speech recognition. Data from early implementations of spectral sharpening are also ambiguous. Our recent investigat...

This paper introduce the new approach to noise reduction in order to improve the speech intelligibility. The system is proposed with minimum band requirement to approximate psychoacoustic Bark scale and nonuniform filter bank constructed with the use of first order all-pass transformation. Proposed psychoacoustic weighting exploits the well known audible noise reduction rule in case of the 16-b...