Abstract: The data transmission efficiency of existing marine VHF voice communication simulators is low and they are only single-function simulators. In order to improve the shortcomings mentioned above, a cross-platform dual-purpose (ship use and land use) VHF simulator is designed. The voice signal is captured and played back by the computer’s sound card and then the voice data are compressed through wavelet algorithm. Data sending and receiving are completed via computer networks and ports instead of radio communication channels. And the software of this simulator is developed based on Qt platform to realize operations on different OS platforms. Function multiplexing, i.e., dual-purpose (ship use and land use) function of VHF is achieved through an optimized design of hardware and software.

Key words: acquisition and playback, voice data, wavelet algorithm, Qt