US PATENT SUBCLASS 379 / 6
.~ By analysis of injected tone signal


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379 /   HD   TELEPHONIC COMMUNICATIONS

1  DF  DIAGNOSTIC TESTING, MALFUNCTION INDICATION, OR ELECTRICAL CONDITION MEASUREMENT {12}
6.~ By analysis of injected tone signal


DEFINITION

Classification: 379/6

By analysis of injected tone signal:

(under subclass 1) Subject matter which includes placing a signal into the system to be tested and comparing the parameters of the output signal from the system over a continuous range with the corresponding parameters of the signal input.

(1) Note. Such testing is often used in determination of degradation or crosstalk.

SEE OR SEARCH CLASS

324, Electricity: Measuring and Testing,

628, for measurement of interference between circuits.