Matches in DBpedia 2015-10 for { <http://dbpedia.org/resource/Carbon_microphone> ?p ?o }
- Carbon_microphone abstract "The carbon microphone, also known as carbon button microphone, button microphone, or carbon transmitter, is a type of microphone, a transducer that converts sound to an electrical audio signal. It consists of two metal plates separated by granules of carbon. One plate is very thin and faces toward the speaking person, acting as a diaphragm. Sound waves striking the diaphragm cause it to vibrate, exerting a varying pressure on the granules, which in turn changes the electrical resistance between the plates. Higher pressure lowers the resistance as the granules are pushed closer together. A steady direct current is passed between the plates through the granules. The varying resistance results in a modulation of the current, creating a varying electric current that reproduces the varying pressure of the sound wave. In telephony, this undulating current is directly passed through the telephone wires to the central office. In public address systems or recording devices it is amplified by an audio amplifier. The frequency response of the carbon microphone, however, is limited to a narrow range, and the device produces significant electrical noise.Before the proliferation of vacuum tube amplifiers in the 1920s, carbon microphones were the only practical means of obtaining high-level audio signals. They were widely used in telephone systems until the 1980s, while other applications used different microphone designs much earlier. Their low cost, inherently high output and frequency response characteristic were well suited for telephony. For plain old telephone service (POTS), carbon-microphone based telephones can still be used without modification. Carbon microphones, usually modified telephone transmitters, were widely used in early AM radio broadcasting systems, but their limited frequency response, as well as a fairly high noise level, led to their abandonment in those applications by the late 1920s. They continued to be widely used for low-end public address, and military and amateur radio applications for some decades afterward.".
- Carbon_microphone thumbnail Carbon_Button_Microphone.JPG?width=300.
- Carbon_microphone wikiPageExternalLink chap36.html.
- Carbon_microphone wikiPageID "5238485".
- Carbon_microphone wikiPageLength "13393".
- Carbon_microphone wikiPageOutDegree "66".
- Carbon_microphone wikiPageRevisionID "675017469".
- Carbon_microphone wikiPageWikiLink AM_broadcasting.
- Carbon_microphone wikiPageWikiLink Acoustic_wave.
- Carbon_microphone wikiPageWikiLink Alexanderson_alternator.
- Carbon_microphone wikiPageWikiLink Amateur_radio.
- Carbon_microphone wikiPageWikiLink Amplifier.
- Carbon_microphone wikiPageWikiLink Amplitude_modulation.
- Carbon_microphone wikiPageWikiLink Audio_amplifier.
- Carbon_microphone wikiPageWikiLink Audio_power_amplifier.
- Carbon_microphone wikiPageWikiLink Audio_signal.
- Carbon_microphone wikiPageWikiLink Candlestick_telephone.
- Carbon_microphone wikiPageWikiLink Carbon.
- Carbon_microphone wikiPageWikiLink Category:American_inventions.
- Carbon_microphone wikiPageWikiLink Category:History_of_the_telephone.
- Carbon_microphone wikiPageWikiLink Category:Microphones.
- Carbon_microphone wikiPageWikiLink Category:Thomas_Edison.
- Carbon_microphone wikiPageWikiLink Chemical_industry.
- Carbon_microphone wikiPageWikiLink Chemical_manufacturing.
- Carbon_microphone wikiPageWikiLink Cliff_effect.
- Carbon_microphone wikiPageWikiLink Continuous_wave.
- Carbon_microphone wikiPageWikiLink Current_divider.
- Carbon_microphone wikiPageWikiLink David_Edward_Hughes.
- Carbon_microphone wikiPageWikiLink Diaphragm_(acoustics).
- Carbon_microphone wikiPageWikiLink Direct_current.
- Carbon_microphone wikiPageWikiLink Electric_current.
- Carbon_microphone wikiPageWikiLink Electrical_current.
- Carbon_microphone wikiPageWikiLink Electrical_noise.
- Carbon_microphone wikiPageWikiLink Electrical_resistance.
- Carbon_microphone wikiPageWikiLink Electrical_resistance_and_conductance.
- Carbon_microphone wikiPageWikiLink Electromagnetic_pulse.
- Carbon_microphone wikiPageWikiLink Emile_Berliner.
- Carbon_microphone wikiPageWikiLink Explosion.
- Carbon_microphone wikiPageWikiLink File:Carbon_microphone.svg.
- Carbon_microphone wikiPageWikiLink Frequency_response.
- Carbon_microphone wikiPageWikiLink Gain_(electronics).
- Carbon_microphone wikiPageWikiLink Grid_bias.
- Carbon_microphone wikiPageWikiLink Lightning.
- Carbon_microphone wikiPageWikiLink Metal.
- Carbon_microphone wikiPageWikiLink Microphone.
- Carbon_microphone wikiPageWikiLink Mining.
- Carbon_microphone wikiPageWikiLink Modulation.
- Carbon_microphone wikiPageWikiLink Noise_(electronics).
- Carbon_microphone wikiPageWikiLink Nuclear_explosion.
- Carbon_microphone wikiPageWikiLink Oscillation.
- Carbon_microphone wikiPageWikiLink Oscillators.
- Carbon_microphone wikiPageWikiLink Party_line_(telephony).
- Carbon_microphone wikiPageWikiLink Plain_old_telephone_service.
- Carbon_microphone wikiPageWikiLink Pressure.
- Carbon_microphone wikiPageWikiLink Public_address.
- Carbon_microphone wikiPageWikiLink Public_address_system.
- Carbon_microphone wikiPageWikiLink Radio_transmitter.
- Carbon_microphone wikiPageWikiLink Recording.
- Carbon_microphone wikiPageWikiLink Reginald_Fessenden.
- Carbon_microphone wikiPageWikiLink Repeater.
- Carbon_microphone wikiPageWikiLink Royal_Society.
- Carbon_microphone wikiPageWikiLink Shure.
- Carbon_microphone wikiPageWikiLink Sound.
- Carbon_microphone wikiPageWikiLink Sound_quality.
- Carbon_microphone wikiPageWikiLink Sound_wave.
- Carbon_microphone wikiPageWikiLink Telephone_exchange.
- Carbon_microphone wikiPageWikiLink Telephone_repeater.
- Carbon_microphone wikiPageWikiLink Telephony.
- Carbon_microphone wikiPageWikiLink Third_World.
- Carbon_microphone wikiPageWikiLink Thomas_Edison.
- Carbon_microphone wikiPageWikiLink Transducer.
- Carbon_microphone wikiPageWikiLink Transmitter.
- Carbon_microphone wikiPageWikiLink Vacuum_tube.
- Carbon_microphone wikiPageWikiLink Voltage.
- Carbon_microphone wikiPageWikiLink Voltage_transient.
- Carbon_microphone wikiPageWikiLink File:Carbon_Button_Microphone.JPG.
- Carbon_microphone wikiPageWikiLink File:David_Edward_Hughes.jpg.
- Carbon_microphone wikiPageWikiLink File:Ericsson_carbon_microphone_opened.jpg.
- Carbon_microphone wikiPageWikiLinkText "Carbon microphone".
- Carbon_microphone wikiPageWikiLinkText "Carbon microphones used as amplifiers".
- Carbon_microphone wikiPageWikiLinkText "Carbon_microphone".
- Carbon_microphone wikiPageWikiLinkText "button microphone".
- Carbon_microphone wikiPageWikiLinkText "carbon button microphones".
- Carbon_microphone wikiPageWikiLinkText "carbon button transmitter".
- Carbon_microphone wikiPageWikiLinkText "carbon grain "transmitter"".
- Carbon_microphone wikiPageWikiLinkText "carbon granule transmitter".
- Carbon_microphone wikiPageWikiLinkText "carbon granules transmitter".
- Carbon_microphone wikiPageWikiLinkText "carbon microphone".
- Carbon_microphone wikiPageWikiLinkText "carbon microphones were used".
- Carbon_microphone wikiPageWikiLinkText "carbon telephone".
- Carbon_microphone wikiPageWikiLinkText "carbon transmitter".
- Carbon_microphone wikiPageWikiLinkText "transmitter".
- Carbon_microphone hasPhotoCollection Carbon_microphone.
- Carbon_microphone wikiPageUsesTemplate Template:Citation_needed.
- Carbon_microphone wikiPageUsesTemplate Template:Commons_category.
- Carbon_microphone wikiPageUsesTemplate Template:Telecommunications.
- Carbon_microphone wikiPageUsesTemplate Template:US_patent.
- Carbon_microphone subject Category:American_inventions.
- Carbon_microphone subject Category:History_of_the_telephone.
- Carbon_microphone subject Category:Microphones.