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http://dx.doi.org/10.5515/KJKIEES.2012.23.7.805

Analysis of Reference Signal for Immunity Test of Sound System and Television Broadcast Receiver  

Choi, Su-Na (Electronics and Telecommunications Research Institute)
Cho, Sung-Woong (Electronics and Telecommunications Research Institute)
Park, Seung-Keun (Electronics and Telecommunications Research Institute)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.23, no.7, 2012 , pp. 805-814 More about this Journal
Abstract
Intermittent or periodic signals with undulating amplitudes of mobile devices cause interference noise at audible frequency to the sound system which is installed nearby. In this regard, it is recently issued that the intermittently transmissions of LTE mobile phones cause the interference noises with sound systems, similar to that of GSM mobile phones. For retaining the immunity to noises, a national regulation KN20 suggests a 1 kHz AM 80 % and a CDMA modulation signal as reference signals for immunity test of sound and television broadcast receiver. In this paper, the effects of interference noises of AM and CDMA are compared with those of GSM and LTE, and the improvement of reference signal for national immunity test of sound systems is suggested. It is recommended to delete the CDMA modulation signal from reference signals for immunity test because it hardly cause interference noise with sound systems. On the other hand, it is desirable to select the modulation signal of LTE instead of CDMA as a reference signal for immunity test of sound system and television broadcast receiver because many people use the LTE service and it is analysed that the LTE signal causes considerable interference noises.
Keywords
LTE; Sound System; Interference; Immunity Test;
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