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Communication Dans Un Congrès Année : 1994

Toward a digital acoustic underwater phone

André Goalic
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Joël Labat
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Joël Trubuil
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Samir Saoudi

Résumé

This paper deals with the design of a digital acoustic underwater phone prototype. Digital techniques allow to achieve a synthesized speech with a quality close to the telephonic one. The input speech signal is compressed down to 5.45 kbit/s using a CELP coder. The hit rate is 6 kbiffs before channel coding (including frame synchronization's word) and expected to be about 8 kbits/s after channel coding. A QPSK modulation with differential encoding was chosen to transmit the useful signal. For the receiver we used a scheme where synchronization and equalization (FSE+DFE) were jointly optimized. The whole system (unidirectionnal link) has been implemented on single DSPs (Motorola 56001) and tested successfully in a very difficult environment (IFREMER pool).

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Dates et versions

hal-02160308 , version 1 (19-06-2019)

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Citer

André Goalic, Joël Labat, Joël Trubuil, Samir Saoudi, Daniel Rioualen. Toward a digital acoustic underwater phone. IEEE OCEANS' 94 : proceedings of oceans engineering for today's technology and tomorrow's preservation, Sep 1994, Brest, France. pp.III- 489 - III- 494, ⟨10.1109/OCEANS.1994.364247⟩. ⟨hal-02160308⟩
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