GNSS-based sound card synchronization

• Autorzy: Carôt Alexander , Mahmood Hasan , Hoene Christian

Identyfikatory

DOI

10.15439/2019F148

• Konferencja: Federated Conference on Computer Science and Information Systems (14 ; 01-04.09.2019 ; Leipzig, Germany)
• Języki publikacji: EN

Abstrakty

EN

Audio communication on the public Internet suffers from not synchronized word clocks of the involved audio devices. The resulting clock drift leads to audio dropouts, which is typically compensated by a sample rate conversion (SRC) in standard telecommunication systems. This, however, does not fulfill the requirements of a high-quality audio system, in which all devices share one and the same word clock. Professional IP based network audio systems such as DANTE or AVB with their respective clock synchronization techniques have so been limited to LAN usage, where network jitter and loss have negligible importance regarding the required accuracy in the dimension of several nanoseconds. In a WAN, however, jitter in the millisecond dimension would lead to unacceptable measurement errors for the intended clock synchronization. As a consequence, we decided to investigate alternative clock synchronization techniques for WAN-distributed devices and developed a GNSS-based approach, which leads to precise clock synchronization.

Słowa kluczowe

EN

clock; Internet; IP network; jitter; local area network; measurement errors; satellite navigation; synchronisation; wide area network

PL

system nagłośnieniowy; zegar; Internet; Sieć IP; drganie; sieć lokalna; błędy pomiarowe; nawigacja satelitarna; synchronizacja; sieć rozległa

• Wydawca: Polskie Towarzystwo Informatyczne
• Czasopismo: Annals of Computer Science and Information Systems
• Rocznik: 2019
• Tom: Vol. 18
• Strony: 309--–312
• Opis fizyczny: Bibliogr. 11 poz., rys., wykr.

Twórcy

autor

Carôt Alexander

• Anhalt, University of Applied Sciences, Lohmannstr. 23, 06366 Köthen, Germany

autor

Mahmood Hasan

• Symonics GmbH, Geierweg 25, 72144 Dußlingen, Germany

autor

Hoene Christian

• Symonics GmbH, Geierweg 25, 72144 Dußlingen, Germany

Bibliografia

• 1. L. J. Arceo-Miquel, Yuriy Shmaliy, and Oscar Ibarra-Manzano. “Optimal Synchronization of Local Clocks by GPS 1 PPS Signals Using Predictive FIR Filters”. In: IEEE Transactions (2009), pp. 1833–1840. http://dx.doi.org/10.1109/TIM.2009.2013654.
• 2. Audinate Website. Dante Overview. [Online; accessed 12-May-2019]. 2019. URL: https://www.audinate.com/solutions/dante-overview.
• 3. Alexander Carôt. “Musical Telepresence – A Compre-hensive Analysis Towards New Cognitive and Technical Approaches”. PhD thesis. Institute of Telematics – University of Lübeck, Germany, 2009.
• 4. Alexander Carôt and Christian Werner. “External latency-optimized soundcard synchronization for applications in wide-area networks”. In: Proceedings of the 14th regional AES Convention. Tokyo, Japan, July 2009.
• 5. Bálint Ferencz. Hardware Assisted IEEE 1588 Clock Synchronization Under Linux. Master Thesis. Budapest University of Technology and Economics, 2013.
• 6. GPSd reference manual. [Online; accessed 12-May-2019]. URL: http://catb.org/gpsd.
• 7. Christoph Kuhr and Alexander Carôt. “A Jack Sound Server Backend to Synchronize to An IEEE 1722 AVTP Media Clock Stream”. In: Proceedings of the Linux Audio Conference 2019. Stanford, USA, 2019.
• 8. Donald A. Lewine. POSIX programmers guide. first. O’Reilly, 1994.
• 9. phc.h Source code. [Online; accessed 12-May-2019]. URL : https://github.com/richardcochran/linuxptp/blob/master/phc.h.
• 10. Ken C. Pohlmann. Principles of Digital Audio. fifth. The Mcgraw-Hill Companies, 2005.
• 11. NXP Semiconductors. iMx7d Dual Applications Pro- cessor Reference Manual. 2019.

Uwagi

1. Track 2: Computer Science & Systems

2. Technical Session: 12th International Symposium on Multimedia Applications and Processing

3. Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).