3rd French conference on acoustics
J. Phys. IV France 04 (1994) C5-469-C5-472
Underwater voice communications using digital techniquesB. WOODWARD and H. SARI
Department of Electronic and Electrical Engineering, Loughborough University of Technology, Leicestershire LE11 3TU, U.K.
A digital signal processor (DSP) based voice communication system for divers with a 2400 bit/s transmission rate is described. Each speech signal frame is analysed using linear predictive coding (LPC) and the essential parameters such as amplitude, pitch period and digital filter coefficients are extracted. These parameters are transmitted through a water channel at a rate of 2400 bit/s by employing digital pulse position modulation (DPPM).
© EDP Sciences 1994