Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Hitachi Ltd
Original Assignee
Hitachi Ltd
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Filing date
Publication date
Application filed by Hitachi LtdfiledCriticalHitachi Ltd
Priority to JP50036773ApriorityCriticalpatent/JPS51112225A/en
Publication of JPS51112225ApublicationCriticalpatent/JPS51112225A/en
PURPOSE: After changing a tone signal into pulses, to synchronize the pulses by a separate oscillator pulse, count the pulses in a regulated time and determine whether the number of the pulses are within the regulated value.
COPYRIGHT: (C)1976,JPO&Japio
JP50036773A1975-03-281975-03-28Tone detection system
PendingJPS51112225A
(en)