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117 results on '"Bernd Edler"'

1. webMUSHRA — A Comprehensive Framework for Web-based Listening Tests

Author

Michael Schoeffler, Sarah Bartoschek, Fabian-Robert Stöter, Marlene Roess, Susanne Westphal, Bernd Edler, and Jürgen Herre

Subjects
web-based, listening tests, auditory experiments, MUSHRA, Web Audio API, Computer software, QA76.75-76.765
Abstract

For a long time, many popular listening test methods, such as ITU-R BS.1534 (MUSHRA), could not be carried out as web-based listening tests, since established web standards did not support all required audio processing features. With the standardization of the Web Audio API, the required features became available and, therefore, also the possibility to implement a wide range of established methods as web-based listening tests. In order to simplify the implementation of MUSHRA listening tests, the development of webMUSHRA was started. By utilizing webMUSHRA, experimenters can configure web-based MUSHRA listening tests without the need of web programming expertise. Today, webMUSHRA supports many more listening test methods, such as ITU-R BS.1116 and forced-choice procedures. Moreover, webMUSHRA is highly customizable and has been used in many auditory studies for different purposes.

Published
2018
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3. Signal Processing Strategies for Cochlear Implants Using Current Steering

Author

Waldo Nogueira, Leonid Litvak, Bernd Edler, Jörn Ostermann, and Andreas Büchner

Subjects
Telecommunication, TK5101-6720, Electronics, TK7800-8360
Abstract

In contemporary cochlear implant systems, the audio signal is decomposed into different frequency bands, each assigned to one electrode. Thus, pitch perception is limited by the number of physical electrodes implanted into the cochlea and by the wide bandwidth assigned to each electrode. The Harmony HiResolution bionic ear (Advanced Bionics LLC, Valencia, CA, USA) has the capability of creating virtual spectral channels through simultaneous delivery of current to pairs of adjacent electrodes. By steering the locus of stimulation to sites between the electrodes, additional pitch percepts can be generated. Two new sound processing strategies based on current steering have been designed, SpecRes and SineEx. In a chronic trial, speech intelligibility, pitch perception, and subjective appreciation of sound were compared between the two current steering strategies and standard HiRes strategy in 9 adult Harmony users. There was considerable variability in benefit, and the mean results show similar performance with all three strategies.

Published
2009
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48. Frequency Domain Long-Term Prediction for Low Delay General Audio Coding

Author

Bernd Edler and Ning Guo

Subjects
Modified discrete cosine transform, Computer science, Applied Mathematics, Algorithmic efficiency, Frequency domain, Signal Processing, Harmonic, Electrical and Electronic Engineering, Long-term prediction, Joint (audio engineering), Algorithm, Domain (software engineering), Coding (social sciences)
Abstract

In this paper we propose a long-term prediction method for low delay transform domain general audio coders. This Frequency Domain Joint Harmonics Prediction (FDJHP) method operates directly in the Modified Discrete Cosine Transform (MDCT) domain and can enhance the coding efficiency, even under very low frequency resolutions. We compare this new method with state-of-the-art MDCT based methods by analyzing bitrate savings and by a listening test using test signals with strong harmonic components. The results indicate that it outperforms an existing method, which also directly operates in the frequency domain. Additionally, we show how it can be combined with the existing techniques into an adaptive system, where the different methods can complement each other.

Published
2021
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