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http://dx.doi.org/10.9723/jksiis.2018.23.6.059

Voice Communication Performance in 900MHz ISM Band Using Codec2  

Kim, Gyeong-Jin ((주)빌리브마이크론)
Kim, Jeong-Uk (상명대학교, 전기공학과)
Publication Information
Journal of Korea Society of Industrial Information Systems / v.23, no.6, 2018 , pp. 59-66 More about this Journal
Abstract
In this paper, we experimented how long distance voice communication is possible After implemented PTT(Push to talk) Bi-directional radio using open source project Codec 2, which is a low speed voice codec for digital amateur radio and 900MHz FSK transceiver. In case of a general digital radio, the AMBE+2 codec, which is regarded as an industry standard in terms of performance, is expensive and has the monopoly of technology. Using the 400MHz band in terms of frequency, narrow bandwidth of DMR(12.5kHz) and DPMR(6.25kHz) is used, so the data rate is low. In the 900MHz bandwidth can be extended, which is advantageous in terms of data transmission. As a result of the voice quality and distance field test, we could find that the communication takes place within about 500m. In this paper, only voice communication is reviewed. if a review of data transmission such as a simple image is added, this solution can be used in various fields as a low cost IOT radio.
Keywords
Codec2; FSK; ISM Band; DPMR(Digital Private Mobile Radio); DMR(Digital Mobile Radio);
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