2003•Unpublished venueRequires access

The noise elimination system using the amplitude-locked loop with cochannel FM interference

Gwo-Jeng Yu, Pei Chao, Gwo-Jia Jong, Te‐Jen Su, Sheng Chang, B.D. Liu

Abstract

The frequency modulation (FM) signal was conceived to minimise the effect of additive noise - since additive noise is the principal source of signal corruption in amplitude modulation (AM), the pre-cursor of frequency modulation. When the FM signal is received the additive noise is removed by limiter action. This process is a necessary part of FM demodulation. Without hard limiting, the signal is corrupted by both phase noise and by amplitude noise. It had not been possible to achieve FM demodulation without first using a hard limiter - not until the realisation of the amplitude locked loop (ALL).

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Key concepts: Amplitude modulation, Demodulation, Limiter, Frequency modulation, Noise (video), Analog transmission, Phase-locked loop, SIGNAL (programming language)