FIELD: physics, acoustics.
SUBSTANCE: invention relates to an information system for delivering different types of information to an end device through acoustic waves. A transmitter capable of generating acoustic waves for transmitting information, which are almost inaudible to the human ear, is required in a medium which enables to transmit information through acoustic waves. The transmitter is a device for converting different types of information into an acoustic wave in a sound spectrum, and transmission, having a microphone for receiving ambient sound at the point from where the acoustic wave is emitted, which serves as the input signal of the ambient sound; a peak frequency detector for determining in the ambient sound signal the peak frequency of the main component of ambient sound; a carrier generator for generating carriers, having a plurality of frequencies equal to the product of the peak frequency and a natural number and can be used to mask ambient sound; and a modulator for modulating the plurality of carriers of the baseband.
EFFECT: transmitting information through acoustic waves.
6 cl, 5 dwg
