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In this position paper, a fast real-time algorithm for the sound source localization system using microphone array is proposed. The algorithm includes three steps: Delay time estimation using time difference of arrival (TDOA); Searching area selection based on angle of arrival; and, Sound source localization using a newly golden section searching (GSS) method. Thanks to the first two steps, we can...
In multichannel systems, acoustic time delay estimation (TDE) is a challenging problem in reverberant environments. Although blind system identification (BSI) based methods have been proposed which utilize a realistic signal model for the room impulse response (RIR), their TDE performance depends strongly on that of the BSI, which is often inaccurate in practice when the identified responses are under-modelled...
The Time Difference of Arrival (TDOA) of an acoustic source with respect to a given pair of microphones is typically estimated as the maximizer of a Measure of Synchrony (MoS) between the pair of microphone signals, within the interval [−D/v, D/v], where D is the inter-microphone distance and v is the speed of sound. In practical enclosures, phantom sources are created due to reverberation, which...
Self-localization of smart portable devices serves as foundation for several novel applications. This work proposes a set of algorithms that enable a mobile device to passively determine its position relative to a known reference with centimeter precision, based exclusively on the capture of acoustic signals emitted by controlled sources around it. The proposed techniques tackle typical practical...
A method for estimating the pressure at the eardrum in magnitude and phase is proposed. The method uses measurements of pressure and particle velocity at the entrance of the ear canal to estimate the product between the propagation constant and the length of the ear canal. This estimation of the ear canal properties is used then to estimate the pressure at the eardrum. The proposed method provides...
Acoustic source time-difference of arrivals (TDOAs) estimation is a basic task required by source localization and separation techniques. Standard wide-band methods, e.g. the GCC-PHAT, estimate the TDOAs by evaluating the cross-correlation at multiple time lags and performing a direct-search of the global maximum. A more convenient formulation is to model the time-delay in the frequency domain and...
In this paper, a new approach for sampling rate offset (SRO) estimation between nodes of a wireless acoustic sensor network (WASN) is proposed using the phase drift of the coherence function between the signals. This method, referred to as least squares coherence drift (LCD) estimation, assumes that the SRO induces a linearly increasing phase-shift in the short-time Fourier transform (STFT) domain...
This paper provides a method of accurate time delay extraction for indoor pulse sound location. For short pulse signal, we use endpoint detection method and smoothed coherence transform weighted generalized cross correlation (SCOT-GCC) algorithm to estimate time difference of arrivals (TDOAs) between two microphones, and extract TDOAs of SCOT-GCC which is much closer to endpoint detection results...
Nowadays the use of voice recognition system is increasing day by day. Dereverberation of speech signal is necessary to make this voice recognition system effective and smooth. Beamforming technique and an adaptive process are useful for blind channel estimation which can be used for dereverberation process. Reverberated channel estimation is a very important step for de-reverberation process. This...
The "cocktail party problem" has always been a challenging problem to solve and many blind source separation algorithms have been proposed as solutions. This problem has mainly been discussed for non-moving sound sources but it still remains for moving sound sources and high acoustic reverberations. The ability to localise and track multiple moving speakers is a pre-requisite to solving...
In many engineering fields, distance to target is very important information. Typical distance measurement methods use time delay between transmitted and reflected waves, but it is difficult to estimate short distance. On the other hand, a method for measuring short distances using standing wave, which is generated by phase interference of transmitted and reflected waves, is known in the field of...
Time delay estimation is a fundamental subject in the field of source localization. Although many accurate approaches were proposed to estimate time delay, only some of them are implementable. We propose two approaches based on average square difference to estimate time delay in adverse conditions. In this way we estimate time delay between two sensors signals. In these approaches a bufferable matrix...
Time delay estimation, which aims at measuring the relative time difference of arrival (TDOA) between different channels is fundamental approach for identifying, localization and tracking radiating sources. So it is the main approach for source localization while the main obstacle for designing robust microphone-based source localization systems is the effects of room reverberation. This paper presented...
Sound source localization is an important feature in robot audition. This work proposes a sound source number and directions estimation method by using the delay information of microphone array. An eigenstructure-based generalized cross correlation method is proposed to estimate time delay between microphones. Upon obtaining the time delay information, the sound source direction and velocity can be...
A novel time delay estimation (TDE) method is proposed based on the concept of mutual information (MI). The relative delay between two sensor output signals is estimated by maximizing the estimated MI of the two signals. In estimating the MI, it does not require any information about prior distribution of the source signal. Instead, the Parzen window estimator is used to estimate the density function...
This paper proposes an eigenvalue decomposition algorithm for robust time-delay estimation (TDE) based on triple microphone in situations where reverberation and spatial noise are present. This algorithm regards time delay estimation with spatial noise and reverberation as a blind channel identification issue of a double-input triple-output system, and use lag correlation matrix to reduce the spatial...
In this paper we present a novel technique which localizes sound source with acceptable accuracy and low time complexity. In this technique, contrary to former localization techniques in 3-D space, only three microphones are sufficient. Instead of searching the entire space domain for the sound source, we first estimate an approximate point of the sound source according to the time delays and the...
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