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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.

Attributes	Values
rdf:type	software yago:WikicatStandardsOfTheUnitedStates yago:Abstraction100002137 yago:Attribute100024264 yago:Manner104928903 yago:Measure100033615 yago:Property104916342 yago:Standard107260623 yago:SystemOfMeasurement113577171 yago:WikicatRadioModulationModes
rdfs:label	C-QUAM (de) C-QUAM (en) C-QUAM (fr) AMステレオ放送 (ja)
rdfs:comment	C-QUAM, englisch Compatible QUadrature Amplitude Modulation, ist ein im nordamerikanischen Raum übliches AM-Stereoverfahren zur analogen Übertragung stereofoner Signale über Rundfunksender im Mittelwellenbereich. Es wurde 1979 von Norman Parker und Francis Hilbert bei der Firma Motorola entwickelt und zählt in den USA und Kanada zu den im Mittelwellenbereich am meisten verwendeten AM-Stereoverfahren. (de) C-QUAM (pour « Compatible QUadrature Amplitude Modulation ») est une technique de radio AM utilisant la modulation d'amplitude en quadrature (QAM) développée par Motorola. Cette technique de diffusion est notamment utilisée aux États-Unis et au Canada. En France elle était utilisée pour France Bleu 107.1 dans la région parisienne sur la fréquence 864 kHz avant que Radio France cesse ses émissions en AM. Ce procédé est utilisé pour la diffusion en stéréo de programmes AM. (fr) AMステレオ放送（エーエムステレオほうそう）の記事では、AMラジオ放送（AM方式による中波放送）のステレオ化に関するトピックについて述べる。研究自体は2波を利用するものまで含めればオーディオのステレオ化の初期からあったが、1波による実用的な方式の機材が一般的に利用可能になったのは1980年代以降であった。日本では1990年代に開始されたものの、10年程度で新規導入局や一般向けの対応受信機は発売されなくなるなど、中波ラジオ放送としては一過性のブームの域を出ない展開ではあったが、局あるいは中継機材のステレオ対応は、その後の中波ラジオ以外へのサイマル放送で活用されているものも見られる。 (ja) 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. (en)
dcterms:subject	Standards of the United States 1977 in radio Motorola Radio technology Broadcast engineering Stereophonic sound Telecommunications-related introductions in 1977
Wikipage page ID	274975 (xsd:integer)
Wikipage revision ID	1049715307 (xsd:integer)
Link from a Wikipage to another Wikipage	Canada dbt:AM_Stereo_radio_stations Publish Quadrature amplitude modulation Envelope detector North Myrtle Beach Rhode Island United States Standards of the United States Motorola 1977 in radio Shortwave Motorola Radio technology WAXB WBLQ (AM) WIRY (AM) WLAD WNMB WXYG Westerly, Rhode Island List of AM stereo radio stations Part 15 Broadcast engineering dbt:AM_Stereo_radio_stations_in_the_United_States HD Radio Inverse second Ionosphere AMAX AM stereo Stereophonic sound Scientific journal Code Skywave CFCB CFCO Telecommunications-related introductions in 1977 IBiquity IEEE Receiver (radio) Sideband Synchronous detector IBOC FM radio Circuitry Signal (computing) Pilot tone Adjacent channel interference WYLD-AM Selective fading dbr:Platform_motion dbr:Wikt:incompatible
Link from a Wikipage to an external page	http://meduci.com https://web.archive.org/web/20120919082259/http:/users.hfx.eastlink.ca/%7Eamstereo/amstereo.htm https://web.archive.org/web/20160305111427/http:/djrock.easycgi.com/DigiModSys2013/library/CQuam%20Intro.pdf
sameAs	C-QUAM C-QUAM C-QUAM C-QUAM C-QUAM C-QUAM C-QUAM C-QUAM
dbp:wikiPageUsesTemplate	dbt:As_of dbt:Citation_needed dbt:Cn dbt:No_footnotes dbt:Reflist dbt:Short_description dbt:Audio_broadcasting
has abstract	C-QUAM, englisch Compatible QUadrature Amplitude Modulation, ist ein im nordamerikanischen Raum übliches AM-Stereoverfahren zur analogen Übertragung stereofoner Signale über Rundfunksender im Mittelwellenbereich. Es wurde 1979 von Norman Parker und Francis Hilbert bei der Firma Motorola entwickelt und zählt in den USA und Kanada zu den im Mittelwellenbereich am meisten verwendeten AM-Stereoverfahren. (de) 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. (en) C-QUAM (pour « Compatible QUadrature Amplitude Modulation ») est une technique de radio AM utilisant la modulation d'amplitude en quadrature (QAM) développée par Motorola. Cette technique de diffusion est notamment utilisée aux États-Unis et au Canada. En France elle était utilisée pour France Bleu 107.1 dans la région parisienne sur la fréquence 864 kHz avant que Radio France cesse ses émissions en AM. Ce procédé est utilisé pour la diffusion en stéréo de programmes AM. (fr)

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