Method of equalization of C-QUAM stereo AM signal

Makoto Itami, Kazuhiro Koyama, Kohji Itoh

Research output: Contribution to journalConference article


C-QUAM stereo AM method is widely used for AM broadcasting. It uses a amplitude phase modulation keeping the compatibility to the conventional monaural AM method. It suffers from nonlinear distortions under multipath environment because it uses a phase modulation scheme. This distortion never appears in the conventional monaural AM signal. In this paper, adaptive equalizers in order to remove multipath distortion for C-QUAM AM stereo signal is proposed. It uses the informations of harmonics of demodulated signal or envelope. Harmonics never appears in the demodulated signal if the multipath distortion is not existing. The characteristics of equalizers are examined by computer simulations. And improvements of D/U ratio are confirmed.

Original languageEnglish
Pages (from-to)1283-1287
Number of pages5
JournalNational Conference Publication - Institution of Engineers, Australia
Issue number94 /9
Publication statusPublished - 1 Dec 1994
EventProceedings of the International Symposium on Information Theory & Its Applications 1994. Part 1 (of 2) - Sydney, Aust
Duration: 20 Nov 199424 Nov 1994


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