Being the birthplace of mp3 and AAC, Erlangen has a long history in audio coding research. Initiated in the late 1970s by Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) professor Dieter Seitzer, the coding research was continued by scientists from both the university and the Fraunhofer Institute for Integrated Circuits IIS. Fraunhofer IIS also took care of the product development and the successful market introduction of the resulting audio codecs that have become indispensable nowadays. The AudioLabs® mark a new era of this fruitful collaboration between both institutions. FAU provides six professorship positions while Fraunhofer IIS fuels the AudioLabs® with its undisputed know-how in audio engineering and its world-class multimedia infrastructure, including sound labs, digital cinema lab etc. and also provides funding. Today, a team of 50 globally-renowned scientists, post docs and PhD students from Fraunhofer IIS and FAU conducts cutting-edge research and shapes the future of audio and multimedia. They bring together scientific ingenuity and the know-how to make new ideas a commercial success.
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Speech intelligibility is an important aspect of speech transmission but often when speech coding standards are compared only the quality is evaluated using perceptual tests. In this study, the performance of three wideband speech coding standards, adaptive multi-rate wideband (AMR-WB), G.718, and enhanced voice services (EVS), is evaluated in a subjective intelligibility test. The test covers different packet loss conditions as well as a near-end background noise condition. Additionally, an objective quality evaluation in different packet loss conditions is conducted. All of the test conditions extend beyond the specification range to evaluate the attainable performance of the codecs in extreme conditions. The results of the subjective tests show that both EVS and G.718 are better in terms of intelligibility than AMR-WB. EVS attains the same performance as G.718 with lower algorithmic delay. Get the paper here.
Read more on EVS research at the AudioLabs.