Realization of Signal Tone Detection in Power Line Carrier Terminal

Zhi Ru Gu; Da Wei Liu; Hong Li Liu; Kun Xu

doi:10.4028/www.scientific.net/AMM.719-720.857

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 719-720Realization of Signal Tone Detection in Power Line...

Realization of Signal Tone Detection in Power Line Carrier Terminal

Abstract:

—when the noise cancellation system ( NC ) is used in the down link of the power line carrier terminal, it can cancel the background noise and narrowband interference, but the downlink signal tone distorts at the same time. This is because the VAD algorithm of the NC system is sensitive to dramatic changes in the power of signal tone. Through detailed researches on time frequency characteristics of signal tone and error factors of network transmission, a new signal tone detection algorithm that applicable to downlink NC system was put forward, The algorithm detects signal tones through changes of frequency-domain power and time-domain signal period of every frame. After theoretical evaluation and practice tests, it is observed that the above-mentioned algorithm can correctly detect signal tones without influence on functions of the NC system, so as to avoid the occurrence of distortion.

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Periodical:

Applied Mechanics and Materials (Volumes 719-720)

Pages:

857-861

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.719-720.857

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Online since:

January 2015

Authors:

Zhi Ru Gu, Da Wei Liu, Hong Li Liu*, Kun Xu

Keywords:

Frequency Spectrum, Noise Cancellation, Signal Tone Detection, Voice Activity Detection

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* - Corresponding Author

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