Journal of the Audio Engineering Society

2002 November - Volume 50 Number 11


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Two-to-Five Channel Sound Processing

Authors: Irwan, Roy; Aarts, Ronald M.

While stereo music reproduction was a dramatic advance over mono, recently a transition to multichannel audio has created a more involving experience for listeners. An algorithm to convert stereo to five-channel sound reproduction is presented. An effective sound distribution to the surround channels is achieved by using a cross-correlation technique, and a robust stereo image is obtained using principal component analysis. Informal listening tests comparing this scheme with other methods revealed that the proposed algorithm is preferred for both on and off the reference listening position (sweet spot).

A scalable and reverse compatible multichannel method of spatial audio using transaural coding designed for multiple-loudspeaker feeds is described with a focus on attaining optimum ear signals. A Fourier transform method for computing HRTF matrices is employed, including the generation of a subset of band-limited reproduction channels. Applications considered embrace multichannel audio, DVD, virtual reality, and telepresence.

A method of reassignment in sound modeling to produce a sharper, more robust additive representation is introduced. The reassigned bandwidth-enhanced additive model follows ridges in a time-frequency analysis to construct partials having both sinusoidal and noise characteristics. This model yields greater resolution in time and frequency than is possible using conventional additive techniques, and better preserves the temporal envelope of transient signals, even in modified reconstruction, without introducing new component types or cumbersome phase interpolation algorithms.

Estimation of Modal Decay Parameters from Noisy Response Measurements

Authors: Karjalainen, Matti; Ansalo, Poju; Mäkivirta, Aki; Peltonen, Timo; Välimäki, Vesa

The estimation of modal decay parameters from noisy measurements of reverberant and resonating systems is a common problem in audio and acoustics, such as in room and concert hall measurements or musical instrument modeling. Reliable methods to estimate the initial response level, decay rate, and noise floor level from noisy measurement data are studied and compared. A new method, based on the nonlinear optimization of a model for exponential decay plus stationary noise floor, is presented. A comparison with traditional decay parameter estimation techniques using simulated measurement data shows that the proposed method outperforms in accuracy and robustness, especially in extreme SNR conditions. Three cases of practical applications of the method are demonstrated.

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