JPS5552953A - Signal observer - Google Patents

Abstract

PURPOSE: To make it possible to accomplish the reliable measurements without any visual error by judging the coincidence between the data displayed in a map and the locator for display by a preset logic value with the use of an electronic circuit.

CONSTITUTION: A line 34 is supplied with read-out data corresponding to the channel from a memory, and a line 38 is supplied with the signals of a locator logic setting switch corresponding to that channel, which are then fed to an exclusive OR circuit 54. When these two signals are under the same logic condition, an output at an L level is fed to a line 44. When the coincidence signals 42W43 of the other channels become coincident, the output of a negative logic NAND circuit 55 takes an H level. This output is fed to the D terminal of an FF 56 thereby to generate the H level while there is coincidence between the data read out of the memory 56 and the logic value of the locator logic setting switch from the FF 56 and to generate the L level during the incoincidence period. The H level signals of a line 47 are generated directly by an OR circuit 58, and the L level signals trigger a retrigger monomulti 57 so that the H level signals are generated from the circuit to indicate the coincidence.

COPYRIGHT: (C)1980,JPO&Japio