About: Armstrong phase modulator

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In 1933, Edwin H. Armstrong patented a method for generating frequency modulation of radio signals. The Armstrong method generates a double sideband suppressed carrier signal, phase shifts this signal, and then reinserts the carrier to produce a frequency modulated signal.

Attributes	Values
rdf:type	yago:Abstraction100002137 yago:Attribute100024264 yago:Manner104928903 yago:Property104916342 yago:WikicatRadioModulationModes
rdfs:label	Armstrong phase modulator (en)
rdfs:comment	In 1933, Edwin H. Armstrong patented a method for generating frequency modulation of radio signals. The Armstrong method generates a double sideband suppressed carrier signal, phase shifts this signal, and then reinserts the carrier to produce a frequency modulated signal. (en)
dcterms:subject	Radio modulation modes Radio technology Broadcast engineering
Wikipage page ID	20959696 (xsd:integer)
Wikipage revision ID	1031640443 (xsd:integer)
Link from a Wikipage to another Wikipage	Carrier signal Amplitude modulation Modulation Phase modulation Radio modulation modes Megahertz Noise Frequency Phase shift Radio technology Distortion Bandwidth (signal processing) Sound recording and reproduction Broadcast engineering Audio signal Frequency deviation Frequency mixer Frequency modulation FM broadcast Sideband Transmitter Voice channel Frequency modulator Kilohertz Operating frequency Radio signal Edwin H. Armstrong AM broadcast dbr:Balanced_modulator dbr:Electronics_theory dbr:FM_bandwidth dbr:Power_output
sameAs	Armstrong phase modulator Armstrong phase modulator Armstrong phase modulator Armstrong phase modulator Armstrong phase modulator
dbp:wikiPageUsesTemplate	dbt:Reflist
has abstract	In 1933, Edwin H. Armstrong patented a method for generating frequency modulation of radio signals. The Armstrong method generates a double sideband suppressed carrier signal, phase shifts this signal, and then reinserts the carrier to produce a frequency modulated signal. Frequency modulation generates high quality audio and greatly reduces the amount of noise on the channel when compared with amplitude modulation. Early broadcasters used amplitude modulation because it was easier to generate than frequency modulation and because the receivers were simpler to make. The indicated that a frequency modulated signal would have infinite bandwidth; for an amplitude modulated signal, the bandwidth is approximately twice the highest modulating frequency. Armstrong realized that while a frequency modulated signal would have an infinite bandwidth, only the first few sets of sidebands would be significant; the rest could be ignored. An amplitude modulated voice channel bandwidth would be approximately 6 kilohertz; a common frequency modulated voice channel bandwidth could be 15 kilohertz. (en)
prov:wasDerivedFrom	wikipedia-en:Armstrong_phase_modulator?oldid=1031640443&ns=0
page length (characters) of wiki page	5563 (xsd:nonNegativeInteger)
foaf:isPrimaryTopicOf	wikipedia-en:Armstrong_phase_modulator
is Link from a Wikipage to another Wikipage of	Edwin Howard Armstrong
is known for of	Edwin Howard Armstrong
is known for of	Edwin Howard Armstrong
is foaf:primaryTopic of	wikipedia-en:Armstrong_phase_modulator

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