CIRCUIT FOR MEASURING DIFFERENCE OF GROUP DELAY TIME (VARIANTS) Russian patent published in 2006 - IPC G01R25/00 G01R27/28 

FIELD: engineering of circuits for estimating time discrepancy, occurring in two-channeled signals passing routes, for instance, in stereo-amplifiers.

SUBSTANCE: circuit has two two-channeled multiplexers, outputs of which are connected to inputs of time shifts meter. Output of time shifts meter is connected to input of block for computing estimate of difference of group delay time. Inputs of one of multiplexers are connected to inputs of researched amplifier, and inputs of another multiplexer - to outputs of amplifier. Difference of group signals delay time, signals coming from outputs of tested amplifier, is measured by means of alternating measurements of delay, appearing in each one of amplifier channels. In accordance to second variant in the circuit outputs of time shifts meter are connected to outputs of multiplexers through two identical filters. Time shifts meter can be correlation meter of time shifts.

EFFECT: circuit makes it possible to perform measurements using any random signals as test signals, spectrums of which lie within target frequencies range, independently for each channel.

2 cl, 3 dwg