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Article: Simple sine synthesizer generates 19-kHz pilot tone for FM baseband signal.(design ideas)
- Article from:
- EDN
- Article date:
- April 14, 2005
- Author:
CopyrightCOPYRIGHT 2005 Reed Business Information, Inc. (US). This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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A MULTIPLEX SIGNAL comprises baseband information transmitted on a stereo analog FM-broadcast system, plus one or more SCA (Subsidiary Communications Authorization) channels (Figure 1). This Design Idea presents a low-cost method of generating the basic 19-kHz pilot tone. The 19-kHz pilot tone comprises a baseband signal, and the L + R and L - R signals consist of DSBSC (double-sideband-suppressed-carrier) modulation centered at 38 kHz. For a receiver to correctly demodulate the signal, the transmitted pilot tone and L - R signal must synchronize at their respective zero crossings. In addition, any distortion in the pilot tone produces harmonics that can interfere with ...
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... ... monitoring technique based on the pilot tone generated by a broadband light source (BLS). Previously, the pilot tone has been obtained by directly modulating ... should be modulated with a unique pilot tone. However, we obtain the pilot tone ...
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