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Schüldt, Christian
Publications (3 of 3) Show all publications
Borgh, M., Schüldt, C. & Claesson, I. (2013). Efficient asynchronous re-sampling implementation on a low-power fixed-point DSP. In: : . Paper presented at IEEE International Conference on Consumer Electronics, ICCE. Las Vegas: IEEE
Open this publication in new window or tab >>Efficient asynchronous re-sampling implementation on a low-power fixed-point DSP
2013 (English)Conference paper, Published paper (Refereed)
Abstract [en]

This paper presents an asynchronous resampling implementation on a low-power fixed-point DSP, which uses around 47% less computational resources compared to the solution provided by the DSP manufacturer, without compromising audio quality.

Place, publisher, year, edition, pages
Las Vegas: IEEE, 2013
Keywords
Audio quality, Computational resources, Fixed-point DSP, Low Power, Resampling
National Category
Signal Processing
Identifiers
urn:nbn:se:bth-6981 (URN)10.1109/ICCE.2013.6486937 (DOI)000318797800169 ()oai:bth.se:forskinfoA73140CC34227255C1257B7500457A25 (Local ID)978-1-4673-1363-6 (ISBN)oai:bth.se:forskinfoA73140CC34227255C1257B7500457A25 (Archive number)oai:bth.se:forskinfoA73140CC34227255C1257B7500457A25 (OAI)
Conference
IEEE International Conference on Consumer Electronics, ICCE
Available from: 2013-05-24 Created: 2013-05-24 Last updated: 2018-01-17Bibliographically approved
Schüldt, C., Lindström, F. & Claesson, I. (2012). A Delay-Based Double-Talk Detector. IEEE Transactions on Audio, Speech, and Language Processing, 20(6), 1725-1733
Open this publication in new window or tab >>A Delay-Based Double-Talk Detector
2012 (English)In: IEEE Transactions on Audio, Speech, and Language Processing, ISSN 1558-7916, E-ISSN 1558-7924, Vol. 20, no 6, p. 1725-1733Article in journal (Refereed) Published
Abstract [en]

When an adaptive filter is used for echo cancellation, it is essential to prevent the filter from diverging in situations when the echo signal is contaminated with near-end disturbance, i.e. during double-talk. This paper presents an extension of a previously proposed double-talk detector for improved performance. It is shown that the computational complexity of the proposed detector is lower than that of the well-used normalized cross correlation (NCC) double-talk detector, at the cost of performance. Further, it is shown that there can be a significant performance difference, in terms of detecting double-talk, between having a fixed echo cancellation filter, which is a common strategy in objective evaluation techniques, and an adaptive filter, which is more close to realistic conditions.

Keywords
Echo cancellation, adaptive filters, double-talk, double-talk detection
National Category
Signal Processing
Identifiers
urn:nbn:se:bth-7170 (URN)10.1109/TASL.2012.2188512 (DOI)000302532000005 ()oai:bth.se:forskinfoC8E2C4C849EAE429C12579F700565253 (Local ID)oai:bth.se:forskinfoC8E2C4C849EAE429C12579F700565253 (Archive number)oai:bth.se:forskinfoC8E2C4C849EAE429C12579F700565253 (OAI)
External cooperation:
Note

http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6155602

Available from: 2012-11-27 Created: 2012-05-07 Last updated: 2017-12-04Bibliographically approved
Schüldt, C. (2012). Low-Complexity Algorithms for Echo Cancellation in Audio Conferencing Systems. (Doctoral dissertation). Karlskrona: Blekinge Institute of Technology
Open this publication in new window or tab >>Low-Complexity Algorithms for Echo Cancellation in Audio Conferencing Systems
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Ever since the birth of the telephony system, the problem with echoes, arising from impedance mismatch in 2/4-wire hybrids, or acoustic echoes where a loudspeaker signal is picked up by a closely located microphone, has been ever present. The removal of these echoes is crucial in order to achieve an acceptable audio quality for conversation. Today, the perhaps most common way for echo removal is through cancellation, where an adaptive filter is used to produce an estimated replica of the echo which is then subtracted from the echo-infested signal. Echo cancellation in practice requires extensive control of the filter adaptation process in order to obtain as rapid convergence as possible while also achieving robustness towards disturbances. Moreover, despite the rapid advancement in the computational capabilities of modern digital signal processors there is a constant demand for low-complexity solutions that can be implemented using low power and low cost hardware. This thesis presents low-complexity solutions for echo cancellation related to both the actual filter adaptation process itself as well as for controlling the adaptation process in order to obtain a robust system. Extensive simulations and evaluations using real world recorded signals are used to demonstrate the performance of the proposed solutions.

Place, publisher, year, edition, pages
Karlskrona: Blekinge Institute of Technology, 2012. p. 156
Series
Blekinge Institute of Technology Doctoral Dissertation Series, ISSN 1653-2090 ; 13
Keywords
Acoustic echo cancellation, Adaptive filtering, Two-path, Double-talk detection
National Category
Signal Processing
Identifiers
urn:nbn:se:bth-00541 (URN)oai:bth.se:forskinfo5D1B5BDF129D2272C1257A94004543F6 (Local ID)978-91-7295-242-3 (ISBN)oai:bth.se:forskinfo5D1B5BDF129D2272C1257A94004543F6 (Archive number)oai:bth.se:forskinfo5D1B5BDF129D2272C1257A94004543F6 (OAI)
Available from: 2012-11-08 Created: 2012-10-11 Last updated: 2017-03-07Bibliographically approved
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