QUALITY CONTROL METHOD FOR DIGITAL RADIO BROADCAST IN MEDIUM- AND SHORT-WAVE BANDS

摘要

FIELD: quality control for radio broadcast in medium- and short-wave bands. SUBSTANCE: threshold of digital radio transmission in medium- and short-wave bands depends on signal-to-noise ratio; when it is higher than this value, quality of audio signal received is perfect and when it is lower, audio signal reception is impossible. For eliminating so-called unexpected threshold use is made of hierarchic modulation (gradual degradation) characterized in such drawbacks as reduction of audio signal data transfer speed and coverage area at high radio reception quality without distortions and increase in radio receiver cost. Novelty is that proposed as an alternative to gradual degradation is acting on modulation and/or coding in radio transmitter, or finding alternative transmission frequencies depending on data on signal quality received from quality control station through Internet. EFFECT: facilitated procedure of requesting data on signal quality. 2 cl