While receiving an FM broadcast in a moving car, unpleasant noise called 'multipath distortion' is sometime heard. This noise is produced when the broadcast waves reflected off of a building or mountain interfere with those directly arrived: it sounds like 'ZAC-ZAC'. In order to provide a more stable and higher quality sound, our company has made great efforts to eliminate such noise. Currently, we have established a multipath noise reduction system far more advanced than conventionally use, and the development of IC's has made it possible to commercialize this system. This system allows adaptive processing by varying the characteristics of noise reduction according to the audio frequency components of broadcast waves: it reduces the deterioration of tonal quality, thereby producing a substantial noise eliminating effect. This paper reports the analysis of multipath interference, and the fundamental principle and effect of this new system.
FM multipath noise reduction
Frequenzmodulierte Mehrweggeraeuschunterdrueckung
SAE-Papers ; Mar ; 1-7
1988
7 Seiten, 12 Bilder, 3 Quellen
Conference paper
English
FM multipath noise reduction control for car radios
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