FIELD: radio engineering, communication.
SUBSTANCE: home appliance comprises a conversion unit for generating a frame, which includes a combination of symbols which respectively represent four different carrier frequencies, based on data which make up a packet, according to a quadrature frequency-shift keying (QFSK) method. The four different carrier frequencies have values lower than 2 kHz. The duration of outputting the carrier frequency, which is output according to one symbol, ranges from 40 to 45 ms.
EFFECT: avoiding the noise suppression of a portable terminal and an echo effect between carrier frequencies which are output according to each symbol which causes signal interference.
23 cl, 8 dwg
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