AES Berlin 2017
Paper Session P11
P11 - Audio Coding
Sunday, May 21, 13:00 — 14:00 (Salon 1 Moscow)
Nadja Schinkel-Bielefeld (Chair)
P11-01 Is it Harder to Perceive Coding Artifact in Foreign Language Items? – A Study with Mandarin Chinese and German Speaking Listeners
Nadja Schinkel-Bielefeld (Presenting Author), Zhang Jiandong (Author), Anna Katharina Leschanowsky (Author), Fu Shanshan (Author), Qin Yili (Author)
MUSHRA listening tests for the evaluation of audio coded material often also include speech stimuli in a language the listener does not understand. However, it is not clear to what extent the lack of understanding and the unfamiliarity with that language and its phonemes may influence the listener’s behavior during the test and his or her quality ratings. In a study containing German and Mandarin Chinese speaking listeners as well as items of these two languages we analyze how ratings and listening times are affected by the foreign language. Pooled over all conditions we find no significant differences in the ratings. However, for high quality items we find that compared to native listeners, non-native listeners need longer listening times and compare more between items.
Convention Paper 9739
P11-02 Parametric Joint Channel Coding of Immersive Audio
Heiko Purnhagen (Presenting Author), Stanislaw Gorlow (Author), Janusz Klejsa (Author), Heidi-Maria Lehtonen (Author), Lars Villemoes (Author)
This paper presents a parametric joint channel coding scheme that enables the delivery of channel-based immersive audio content in formats such as 7.1.4, 5.1.4, or 5.1.2 at very low bit rates. It is based on a generalized approach for parametric spatial coding of groups of two, three, or more channels using a single downmix channel together with a compact parametrization that guarantees full covariance re-instatement in the decoder. By arranging the full-band channels of the immersive content into five groups, the content can be conveyed as a 5.1 downmix together with the parameters for each group. This coding scheme is implemented in the A-JCC tool of the AC-4 system recently standardized by ETSI, and listening test results illustrate its performance.
Convention Paper 9740