Using auditory properties to improve the behaviour of stereophonic acoustic echo cancellers

Gilloire, André; Turbin, Valérie

doi:10.1109/icassp.1998.679682

Cited by 48 publications

(45 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…To realistic TV conferencing, multi-channel audio, at least stereophonic, is essential. For stereophonic teleconferencing, stereophonic acoustic echo cancellers have been studied [1][2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Convergence analysis of stereophonic echo canceller with pre-processing-relation between pre-processing and convergence

Hirano

Nakayama

Watanabe

1999

1999 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings. ICASSP99 (Cat. No.99CH36258)

View full text Add to dashboard Cite

This paper presents convergence characteristics of stereophonic echo cancellers with pre-processing. The convergence analysis of the averaged tap-weights show that the convergence characteristics depends on the relation between the impulse response in the far-end room and the changes of the pre-processing filters. Examining the uniqueness of the solution in the frequency domain leads us to the same relation. Computer simulation results show the validity of these analyses.

show abstract

Section: Introductionmentioning

confidence: 99%

“…Strong crosscorrelation between input signals causes incorrect identification of the echo paths. To overcome this problem, improved echo cancellation algorithms have been proposed [5][6][7][8][9]. Some of these algorithms introduce a pre-processing which artificially varies the cross-correlation [5,6].…”

Section: Introductionmentioning

confidence: 99%

Convergence analysis of stereophonic echo canceller with pre-processing-relation between pre-processing and convergence

Hirano

Nakayama

Watanabe

1999

1999 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings. ICASSP99 (Cat. No.99CH36258)

View full text Add to dashboard Cite

show abstract

“…As a consequence of this, suitable multichannel AEC algorithms have been developed to deal with the echo problem in presence of multiple audio paths, where the task to be solved is tougher than in the single-channel case study, as rigorously illustrated in [2]. Indeed, the "non-uniqueness problem" occurs in the multichannel scenario, due to the high correlation degree between recorded signals: a very popular involved technique involves the addition of a decorrelation module to allow multichannel adaptive filtering working properly [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Stereophonic hands-free communication system based on microphone array fixed beamforming: real-time implementation and evaluation

Pirro

Squartini

Romoli

et al. 2012

J AUDIO SPEECH MUSIC PROC.

View full text Add to dashboard Cite

In this article, the authors propose an optimally designed fixed beamformer (BF) for stereophonic acoustic echo cancelation (SAEC) in real hands-free communication applications. Several contributions related to the combination of beamforming and echo cancelation have appeared in the literature so far, but, up to the authors' knowledge, the idea of using optimal fixed BFs in a real-time SAEC system both for echo reduction and stereophonic audio rendering is first addressed in this contribution. The employment of such designed BFs allows positively addressing both issues, as the several simulated and real tests seem to confirm. In particular, the stereo-recording quality attainable through the proposed approach has been preliminarily evaluated by means of subjective listening tests. Moreover, the overall system robustness against microphone array imperfections and noise presence has been experimentally evaluated. This allowed the authors to implement a real hands-free communication system in which the usage of the proposed beamforming technique has proven its superiority with respect to the usual two-microphone one in terms of echo reduction, and guaranteeing a comparable spatial image. Moreover, the proposed framework requires a low computational cost increment with regard to the baseline approach, since only few extra filtering operations with short filters need to be executed. Nevertheless, according to the performed simulations, the BF-based SAEC configuration seems to not require the signal decorrelation module, resulting in an overall computational saving.

show abstract

“…H. Khong misalignment problem in this practical case, several approaches have been employed to decorrelate the two input signals using, for example, nonlinear processing [4]- [6], spectrally shaped random noise [7], [8], comb filtering [9], leaky extended LMS [10], and alternating fixed-point [11] algorithms. The common aim of these algorithms is to achieve decorrelation of input signals and without affecting the quality or stereophonic image of the speech.…”

mentioning

confidence: 99%

Stereophonic acoustic echo cancellation employing selective-tap adaptive algorithms

Khong

Naylor

2006

IEEE Trans. Audio Speech Lang. Process.

View full text Add to dashboard Cite

Abstract-Stereophonic acoustic echo cancellation has generated much interest in recent years due to the nonuniqueness and misalignment problems that are caused by the strong interchannel signal coherence. In this paper, we introduce a novel adaptive filtering approach to reduce interchannel coherence which is based on a selective-tap updating procedure. This tap-selection technique is then applied to the normalized least-mean-square, affine projection and recursive least squares algorithms for stereophonic acoustic echo cancellation. Simulation results for the proposed algorithms have shown a significant improvement in convergence rate compared with existing techniques.

show abstract

Using auditory properties to improve the behaviour of stereophonic acoustic echo cancellers

Cited by 48 publications

References 6 publications

Convergence analysis of stereophonic echo canceller with pre-processing-relation between pre-processing and convergence

Convergence analysis of stereophonic echo canceller with pre-processing-relation between pre-processing and convergence

Stereophonic hands-free communication system based on microphone array fixed beamforming: real-time implementation and evaluation

Stereophonic acoustic echo cancellation employing selective-tap adaptive algorithms

Contact Info

Product

Resources

About