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- Multi-frequency_receiver abstract "Multi-Frequency signalling, (MF), is similar to the European version, CCITT Signaling System 5, (SS5). The original format was five tones used in pairs. This later evolved to six tones. Because its six tones are used only in pairs, this signaling format is sometimes referred to as \"two-out-of-five code\" or \"two of six.\"Multi-Frequency receivers have been present in US telephony at least since the late 1940s. In 1940s technology, receivers in 4XB and similar equipment used vacuum tubes. Later ones used RC filters and transistors. Digital filters became commonplace in electronic switching systems of the 1980s. For example, in 5ESS switch such jobs were done by DSPs in the Global Digital Services Unit (GDSU).".
- Multi-frequency_receiver thumbnail DTMF_receiver_at_a_No._5_Crossbar_office._(Museum_of_Communication,_Seattle).jpg?width=300.
- Multi-frequency_receiver wikiPageID "4396498".
- Multi-frequency_receiver wikiPageLength "3588".
- Multi-frequency_receiver wikiPageOutDegree "21".
- Multi-frequency_receiver wikiPageRevisionID "612621744".
- Multi-frequency_receiver wikiPageWikiLink 5ESS_switch.
- Multi-frequency_receiver wikiPageWikiLink Category:Telephony_equipment.
- Multi-frequency_receiver wikiPageWikiLink Category:Telephony_signals.
- Multi-frequency_receiver wikiPageWikiLink Computer_Consoles_Inc..
- Multi-frequency_receiver wikiPageWikiLink Digital_filter.
- Multi-frequency_receiver wikiPageWikiLink Digital_signal_processor.
- Multi-frequency_receiver wikiPageWikiLink Dual-tone_multi-frequency_signaling.
- Multi-frequency_receiver wikiPageWikiLink Electronic_switching_system.
- Multi-frequency_receiver wikiPageWikiLink File:DTMF_receiver_at_a_No._5_Crossbar_office._(Museum_of_Communication,_Seattle).jpg.
- Multi-frequency_receiver wikiPageWikiLink File:MFR-II_Printed_Circuit_Card.jpg.
- Multi-frequency_receiver wikiPageWikiLink Goertzel_algorithm.
- Multi-frequency_receiver wikiPageWikiLink Multi-frequency_signaling.
- Multi-frequency_receiver wikiPageWikiLink Rochester,_New_York.
- Multi-frequency_receiver wikiPageWikiLink Signaling_System_No._5.
- Multi-frequency_receiver wikiPageWikiLink Texas_Instruments.
- Multi-frequency_receiver wikiPageWikiLink Texas_Instruments_TMS320.
- Multi-frequency_receiver wikiPageWikiLink Two-out-of-five_code.
- Multi-frequency_receiver wikiPageWikiLink Vacuum_tube.
- Multi-frequency_receiver wikiPageWikiLinkText "Multi-frequency receiver".
- Multi-frequency_receiver wikiPageWikiLinkText "multi-frequency receiver".
- Multi-frequency_receiver subject Category:Telephony_equipment.
- Multi-frequency_receiver subject Category:Telephony_signals.
- Multi-frequency_receiver type Redirect.
- Multi-frequency_receiver comment "Multi-Frequency signalling, (MF), is similar to the European version, CCITT Signaling System 5, (SS5). The original format was five tones used in pairs. This later evolved to six tones. Because its six tones are used only in pairs, this signaling format is sometimes referred to as \"two-out-of-five code\" or \"two of six.\"Multi-Frequency receivers have been present in US telephony at least since the late 1940s. In 1940s technology, receivers in 4XB and similar equipment used vacuum tubes.".
- Multi-frequency_receiver label "Multi-frequency receiver".
- Multi-frequency_receiver sameAs Q6934453.
- Multi-frequency_receiver sameAs m.0b__qj.
- Multi-frequency_receiver sameAs Q6934453.
- Multi-frequency_receiver wasDerivedFrom Multi-frequency_receiver?oldid=612621744.
- Multi-frequency_receiver depiction DTMF_receiver_at_a_No._5_Crossbar_office._(Museum_of_Communication,_Seattle).jpg.
- Multi-frequency_receiver isPrimaryTopicOf Multi-frequency_receiver.