FMX mobile reception

Author

Rucktenwald, Thomas E. ; Torick, Emil L.

Author_Institution

Broadcast Technol. Partners, Greenwich, CT, USA

Volume

34

Issue

4

fYear

1988

fDate

11/1/1988 12:00:00 AM

Firstpage

921

Lastpage

928

Abstract

A general overview is presented of the FMX stereo broadcasting system that provides reduction of background and multipath noise without a loss of stereo separation. The FMX system reduces noise in stereo reception by compressing the stereo difference signal before transmission and expanding it to its original dynamic range at the receiver. The system uses the standard FM stereo composite format with the addition of a new subcarrier for the compressed signal. The added subcarrier is in quadrature with the regular stereo subcarrier at 38 kHz. The compression characteristic provides linear operation at a fixed gain of 14 dB over much of the program dynamic range, while at the highest modulation levels FMX program signals are attenuated to permit delivery of full modulation power for the existing broadcast service. Topics discussed include FMX operation under multipath conditions, multipath detection, and the dynamic equalization techniques used in FMX receivers

Keywords

Hi-Fi equipment; interference suppression; radio reception; 14 dB; 38 kHz; FM stereo composite format; FMX stereo broadcasting system; background noise reduction; compressed signal; dynamic equalization techniques; expander; modulation power; multipath detection; multipath noise reduction; receiver; stereo difference signal; stereo reception; stereo separation; subcarrier; Background noise; Broadcast technology; Broadcasting; Decoding; Degradation; Dynamic range; MONOS devices; Modulation coding; Noise reduction; Space vehicles;

fLanguage

English

Journal_Title

Consumer Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0098-3063

Type

jour

DOI

10.1109/30.9905

Filename

9905