Title:
INDIVIDUAL SELECTING SIGNAL DECODER FOR SHARED EXCHANGE TERMINAL
Document Type and Number:
Japanese Patent JP2809243
Kind Code:
B2
Abstract:
PURPOSE: To decode an individual selecting signal, by measuring the frequency of the individual selecting signal by a digital circuit in an individual selecting signal decoder for each shared exchange terminal.
CONSTITUTION: The individual selecting signal decoder has a waveform shaping part 1 for shaping the waveform of an individual selecting signal to be a sine wave signal sent from a shared exchange and having frequency corresponding to an individual number allocated to one of plural terminals to a square wave signal, period display signal forming parts 2 to 4 for forming a period display signal indicating N times (provided that N is a positive integer) the period of the square wave signal and an individual number computing part 5 for computing an individual number corresponding to N times of the above period in response to the above period display signal.
Inventors:
SATO TADASHI
Application Number:
JP19222891A
Publication Date:
October 08, 1998
Filing Date:
July 31, 1991
Export Citation:
Assignee:
NIPPON DENKI KK
International Classes:
H04Q5/02; H04Q5/10; (IPC1-7): H04Q5/10
Domestic Patent References:
| JP62207098A | ||||
| JP61148995A | ||||
| JP5134687B1 |
Attorney, Agent or Firm:
Yosuke Goto (2 outside)
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