C-QUAM
Sign in to saveC-QUAM (Compatible QUadrature Amplitude Modulation) is the method of AM stereo broadcasting used in Canada, the United States and most other countries. It was invented in 1977 by Norman Parker, Francis Hilbert, and Yoshio Sakaie, and published in an IEEE journal.
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Vinony's link graph records 271 inbound references to C-QUAM, and connects out to shortwave radio, FM broadcasting and Digital Audio Broadcasting.
Vinony files it under 1977 in radio, Broadcast engineering and Motorola.
Vinony links it to 5 Wikipedia language editions.
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- Known problems
- User base
- Competition from IBOC Hybrid Digital Systems
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- References
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C-QUAM (Compatible QUadrature Amplitude Modulation) is the method of AM stereo broadcasting used in Canada, the United States and most other countries. It was invented in 1977 by Norman Parker, Francis Hilbert, and Yoshio Sakaie, and published in an IEEE journal.
Using circuitry developed by Motorola, C-QUAM uses quadrature amplitude modulation (QAM) to encode the stereo separation signal. This extra signal is then stripped down in such a way that it is compatible with the envelope detector of older receivers, hence the name C-QUAM for Compatible. A 25 Hz pilot tone is added to trigger receivers; unlike its counterpart in FM radio, this carrier is not necessary for the reconstruction of the original audio sources.
Excerpted from Wikipedia’s “C-QUAM” article, available under the CC BY-SA 4.0 licence.