| dbo:abstract |
AM stereo is a term given to a series of mutually incompatible techniques for radio broadcasting stereo audio in the AM band in a manner that is compatible with standard AM receivers. There are two main classes of systems: independent sideband (ISB) systems, promoted principally by American broadcast engineer Leonard R. Kahn; and quadrature amplitude modulation (QAM) multiplexing systems (conceptually closer to FM stereo). Initially adopted by many commercial AM broadcasters in the mid to late 1980s, AM stereo broadcasting soon began to decline due to a lack of receivers (most "AM/FM stereo" radios only receive in stereo on FM), a growing exodus of music broadcasters to FM, concentration of ownership of the few remaining stations in the hands of large corporations and the removal of music from AM stations in favour of news/talk or sports broadcasting. By 2001, most of the former AM stereo broadcasters were no longer stereo or had left the AM band entirely. (en) AM-Stereo ist die Bezeichnung eines Verfahrens zur Übertragung stereofoner Signale über Rundfunksender im Lang-, Mittel- oder Kurzwellenbereich. Wegen der geringen zur Verfügung stehenden Bandbreite und der Kompatibilitätsforderung ist das im UKW-Bereich verwendete Pilotton-Multiplexverfahren zur Stereo-Übertragung in diesem Frequenzband nicht anwendbar. Das im nordamerikanischen Raum anzutreffende übliche Verfahren von AM-Stereo ist C-QUAM von Motorola. (de) La modulation d'amplitude en stéréo recouvre plusieurs procédés de radiodiffusion et de transmission radioélectrique en modulation d'amplitude dans la gamme des Petites Ondes (PO) ou Ondes Moyennes (MW) s'étendant sur des fréquences de 525 kHz à 1 605 kHz dans la plupart des pays avec un espacement 9 kHz entre canaux, et jusqu'à 1 710 kHz en Amérique avec un espacement de 10 kHz entre canaux. La Modulation d'amplitude en stéréo est destinée à être reçue directement par le public et s'applique à la fois à la réception individuelle et à la réception communautaire . Les stations de radiodiffusion en modulation d'amplitude en stéréo peuvent être entendues jusqu'à plusieurs centaines de kilomètres selon leur puissance qui peut atteindre 100 kW. Dans les pays tropicaux la bande Petites Ondes (PO) ou Ondes Moyennes (MW) des 120 mètres de 2 300 kHz à 2 550 kHz (à cause des bruits radioélectriques en dessous de 2 000 kHz dans la zone intertropicale). (fr) |
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http://Meduci.com/ http://meduci.com/stations.html http://topazdesigns.com/iboc/AM-IBOC-Parameters.html http://www.almediapage.info/am.html http://www.wa2fnq.com/fnq/amstrdoc.htm https://web.archive.org/web/20051224225300/http:/users.hfx.eastlink.ca/~amstereo/ https://web.archive.org/web/20060713210111/http:/www.radiofrance.fr/chaines/france-bleu/ https://web.archive.org/web/20100601064943/http:/www.fanfarefm.com/soundbites.html |
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AM-Stereo ist die Bezeichnung eines Verfahrens zur Übertragung stereofoner Signale über Rundfunksender im Lang-, Mittel- oder Kurzwellenbereich. Wegen der geringen zur Verfügung stehenden Bandbreite und der Kompatibilitätsforderung ist das im UKW-Bereich verwendete Pilotton-Multiplexverfahren zur Stereo-Übertragung in diesem Frequenzband nicht anwendbar. Das im nordamerikanischen Raum anzutreffende übliche Verfahren von AM-Stereo ist C-QUAM von Motorola. (de) AM stereo is a term given to a series of mutually incompatible techniques for radio broadcasting stereo audio in the AM band in a manner that is compatible with standard AM receivers. There are two main classes of systems: independent sideband (ISB) systems, promoted principally by American broadcast engineer Leonard R. Kahn; and quadrature amplitude modulation (QAM) multiplexing systems (conceptually closer to FM stereo). (en) La modulation d'amplitude en stéréo recouvre plusieurs procédés de radiodiffusion et de transmission radioélectrique en modulation d'amplitude dans la gamme des Petites Ondes (PO) ou Ondes Moyennes (MW) s'étendant sur des fréquences de 525 kHz à 1 605 kHz dans la plupart des pays avec un espacement 9 kHz entre canaux, et jusqu'à 1 710 kHz en Amérique avec un espacement de 10 kHz entre canaux. La Modulation d'amplitude en stéréo est destinée à être reçue directement par le public et s'applique à la fois à la réception individuelle et à la réception communautaire . Les stations de radiodiffusion en modulation d'amplitude en stéréo peuvent être entendues jusqu'à plusieurs centaines de kilomètres selon leur puissance qui peut atteindre 100 kW. Dans les pays tropicaux la bande Petites Ondes (PO (fr) |
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AM-Stereo (de) AM stereo (en) Modulation d'amplitude en stéréo (fr) |
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