Hier finden Sie wissenschaftliche Publikationen aus den Fraunhofer-Instituten.

Network music performance with ultra-low-delay audio coding under unreliable network conditions

Leistungsfähigkeit der Musikübertragung mit Audio-Codierung für ultrageringe Verzögerung bei unzuverlässigen Übertragungsbedingungen
: Krämer, U.; Hirschfeld, J.; Schuller, G.; Wabnik, S.; Carot, A.; Werner, C.

Audio Engineering Society -AES-:
123rd Audio Engineering Society Convention 2007. Vol. 1 : October 5 - 8, 2007, New York, NY, USA
Red Hook, NY: Curran, 2007
ISBN: 978-1-604-23902-7
Audio Engineering Society (Convention) <123, 2007, New York/NY>
Conference Paper
Fraunhofer IDMT ()
Musik; Internet; Paketvermittlung; Jitter-Effekt; Tonwiedergabetechnik; Verzögerungszeit; Codierung; codec

A key issue for successfully interconnecting musicians in real-time over the Internet is minimizing the end-to-end signal delay for transmission and coding. Anyhow, the variance of transmission delay ('jitter') occasionally causes some packets arrive too late for playback. To avoid this problem previous approaches are working with rather large receive buffers while accepting larger delay. In this paper the authors will present a novel solution that keeps buffer sizes and delay minimal. On the network layer the authors are using a highly optimized audio framework called 'Soundjack' and on the coding layer the authors are working with an ultra low-delay codec for high-quality audio. The authors analyze and evaluate a modified transmission and coding scheme for the Fraunhofer Ultra-Low-Delay (ULD) audio coder, which is designed to be more resilient to lost and late arriving data packets.