Temat: ECHO - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Communication Platform for Evaluation of Transmitted Speech Quality
Autorzy:: Ciarkowski, A.
Czyżewski, A.
Powiązania:: https://bibliotekanauki.pl/articles/307893.pdf
Data publikacji:: 2011
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: acoustic echo cancelation
doubletalk detection
echo hiding
Opis:: A voice communication system designed and implemented is described. The purpose of the presented platform was to enable a series of experiments related to the quality assessment of algorithms used in the coding and transmitting of speech. The system is equipped with tools for recording signals at each stage of processing, making it possible to subject them to subjective assessments by listening tests or, ob- jective evaluation employing PESQ or PSQM algorithms. The functionality for the simulation of distortions typical for voice communication over the Internet was implemented, making it possible to obtain reproducible, quantifiable results. An application of the presented platform for evaluation of acoustic echo canceler algorithm based on watermarking techniques, which was developed earlier is presented as an example of an effective deployment of the described technology.
Źródło:: Journal of Telecommunications and Information Technology; 2011, 3; 95-101
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Authentication in VoIP Telephony with Use of the Echo Hiding Method
Autorzy:: Rachoń, J.
Piotrkowski, Z.
Gajewski, P.
Powiązania:: https://bibliotekanauki.pl/articles/309527.pdf
Data publikacji:: 2011
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: authentication
BS 1116-1 test
digital watermarking
echo hiding
Opis:: The paper describes the method intended to authenticate identity of a VoIP subscriber with use of the data hiding technique that is specifically implemented by means of the echo hiding method. The scope includes presentation of experimental results related to transmission of information via a hidden channel with use of the SIP/SDP signalling protocol as well as results of subjective assessment on quality of a signal with an embedded watermark.
Źródło:: Journal of Telecommunications and Information Technology; 2011, 1; 17-21
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Model-Based Method for Acoustic Echo Cancelation and Near-End Speaker Extraction: Non-negative Matrix Factorization
Autorzy:: Agrawal, P.
Shandilya, M.
Powiązania:: https://bibliotekanauki.pl/articles/958086.pdf
Data publikacji:: 2018
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: adaptive algorithms
convergence
echo cancellation
non-negative matrix factorization (NMF)
Opis:: Rapid escalation of wireless communication and hands-free telephony creates a problem with acoustic echo in full-duplex communication applications. In this paper a simulation of model-based acoustic echo cancelation and near-end speaker extraction using statistical methods relying on nonnegative matrix factorization (NMF) is proposed. Acoustic echo cancelation using the NMF algorithm is developed and its implementation is presented, along with all positive, real time elements and factorization techniques. Experimental results are compared against the widely used existing adaptive algorithms which have a disadvantage in terms of long impulse response, increased computational load and wrong convergence due to change in near-end enclosure. All these shortcomings have been eliminated in the statistical method of NMF that reduces echo and enhances audio signal processing.
Źródło:: Journal of Telecommunications and Information Technology; 2018, 2; 15-22
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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