FIELD: technology for estimating time discrepancy occurring in two-channeled signal passing lines, for example, in stereo amplifiers.
SUBSTANCE: in accordance to first variant circuit has two-channel multiplexer, device for measuring time shifts and block for calculating estimates. Difference in group time of signals delay, coming in from outputs of tested amplifier, is measured by serial measurements of delay appearing in each channel of amplifier. In accordance to second variant circuit has delay line, connected to one of outputs of amplifier, time shift meter and estimate calculation block. Inserted delay is selected to be more than maximal possible difference of group delay time. Device for measuring time shifts can be a meter of time shifts of periodic signals, meter of time shifts of random signals, correlation meter of time shifts.
EFFECT: circuit requires no specially attached test signal generator and allows to perform measurements using any signal as test signal, spectrum of which lies within required frequencies spectrum.
2 cl, 4 dwg
