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We extend a very warm welcome to the 40th IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) 2015 in Brisbane, Australia.
Welcome to the 40th ICASSP! This year, the world's premier signal processing conference is being held at the Brisbane Convention & Exhibition Centre in Brisbane, the capital of sunny Queensland. The technical program of regular and special session papers, together with the tutorials and the School of ICASSP, is full of varied, interesting and stimulating ideas. We hope you will both benefit from...
Due to practical considerations the microphone spacing is increased to achieve improved resolution by violating the spatial Nyquist criterion. Accompanied aliasing components adversely affect the identifiability of the source direction peaks. We investigate the effect of aliasing on the spatial spectrum of the steered minimum variance distortionless response (STMV) method and propose a novel multi-stage...
A method for direction-of-arrival (DOA) and diffuseness estimation is presented, which proves to be effective above the spatial aliasing frequency of the microphone array in use. The method assumes symmetrical circular or spherical arrays of directional microphones or microphone mounted on a rigid baffle, and it exploits the inherent directionality of the array at high frequencies. The DOA and diffuseness...
Time-difference-of-arrival (TDOA) estimation is an important problem in many microphone signal processing applications. Traditionally, this problem is solved by using a cross-correlation method, but in this paper we show that the cross-correlation method is actually a restricted special case of a much more general method. In this connection, we establish the conditions under which the crosscorrelation...
Most state-of-the-art Sound Source Localization (SSL) algorithms have been proposed for applications which are “uninformed” about the target sound content; however, utilizing a wireless microphone worn by a target talker, enables recent Hearing Aid Systems (HASs) to access to an almost noise-free sound signal of the target talker at the HAS via the wireless connection. Therefore, in this paper, we...
Multi-microphone speech enhancement requires knowledge of relative Time Delay of Arrival (TDOA) of the desired acoustic source at microphones. This paper presents a novel TDOA estimation method, Steered Null Error PHAse Transform (SNE-PHAT), which exploits null-steering to improve estimation robustness. The method is formulated to be computationally efficient. A generalization to provide frequency-dependent...
Source localization has been studied in the spatial domain using differential geometry in earlier work. However, parameters of the sensor array manifold have hitherto not been investigated for source localization in spherical harmonics domain. The objective of this work is to represent and model the manifold surface using differential geometry. The system model for source localization over a spherical...
The reverberation of an acoustic channel can be characterised by two frequency-dependent parameters: the reverberation time and the direct-to-reverberant energy ratio. This paper presents an algorithm for blindly determining these parameters from a single-channel speech signal. The algorithm uses an extended Kalman filter to estimate the parameters together with a hidden semi-Markov model to identify...
A method for decomposing audio signals into direct signals and ambient signals is described that can be applied to sound post-production and reproduction. The proposed method is based on a parametric multichannel Wiener filter (MWF) that enables a trade-off between the attenuation of the interfering signal and the distortion of the desired signal. We show that theMWF leads to distortions of the spatial...
Reverberation time is an important parameter for characterizing acoustic environments. It is useful in many applications including acoustic scene analysis, robust automatic speech recognition and dereverberation. Given knowledge of the acoustic impulse response, reverberation time can be measured using Schroeder's backward integration method. Since it is not always practical to obtain impulse responses,...
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