MULTI-FUNCTIONAL DEVICE FOR MEASURING FREQUENCY DISTORTIONS Russian patent published in 2007 - IPC G01R23/18 

FIELD: radio-measurements, possible use for evaluating frequency distortions introduced by frequency-dependent devices, for example, amplifiers of audio-signals.

SUBSTANCE: multi-functional device for measuring frequency distortions, introduced by a quadripole, contains N analog blocks for estimating statistic characteristics of input and output signals of quadripole, multiplexer, analog-digital converter and functional converter, output of which is the output of measuring device, first inputs of N analog blocks for estimating statistic characteristics are combined and make up the first testing input of measuring device, second inputs of N analog blocks for estimating statistical characteristics are combined and make up the second testing input of measuring device, outputs of N analog blocks for estimating statistical characteristics are connected to corresponding channel inputs of multiplexer, output of which is connected to input of functional transformer, N analog blocks for estimating statistical characteristics are meant for estimating statistical characteristics of corresponding N dedicated frequency bands within range of working frequencies of quadripole. N analog blocks for estimating statistical characteristics of input and output signals of quadripole may be made in form of devices for estimating half-period average or mean-square values or dispersions of signals.

EFFECT: possible evaluation of frequency distortions, occurring in quadripole on passage of useful signal through it in working mode, without disabling the quadripole and without injecting a special testing signal into its input; possible estimation of distortions on basis of various criterions.

4 cl, 1 dwg