SU522513A1 - Device for measuring distortion of signals recorded and reproduced in magnetic recording equipment - Google Patents

Description

(54) DEVICE FOR MEASURING DISTORTIONS RECORDED AND REPRODUCED IN MAGNETIC RECORDING DEVICES

SIGNALS

The reference signal generator 1 is connected through a series-connected test signal generator 2, a low-pass filter 3 and a magnetic recording device 4 under study connected to a subtraction unit 5, the generator 1 is connected to another input of the same unit through a serially connected delay control unit 6, the test signal generator 7 , the voltage regulator 8 and the second low-pass filter 9. Between the first input of the subtraction unit and the second input of the second generator 7, a post-electrical circuit is connected, consisting of a differential circuit 10, an amplitude selector 11 and a former 12. A voltage meter 13 is used with a pointing device.

Generator 1 creates a square-shaped voltage that, after passing through generator 2 in the presence of a pseudo-random signal, hits filter 3. The latter suppresses harmonics beyond the bandwidth of the magnetic recording device being investigated 4. Regardless of the storage time of information recorded on device 4, and the quality of the recording in one way or another in the recorded information will be present distortion. But when reproducing the recorded information, the signal is sent oAiiOBpeMeHHO to the subtraction unit and to the differentiating circuit. Then, the output of the latter turns out to be distinguished voltage surges, which follow with frequencies determined by generator 2, and the largest burst will be determined by the period of a pseudo-random signal. The amplitude selector 11 will miss only those bursts that follow once per pseudo-random period: the signal. Next, the voltage is again formed by the former in the form of a rectangular voltage and is fed to the second generator 7 of the test signal. At the same time, the same 1 non-voltage comes from the voltage of the delay control unit 6, which eliminates the parasitic time shifts in the signal that occur when it passes the test

magnetic recording apparatus 4, low-pass filter voltage regulator 8 9. The voltage regulator provides equal reproduction of signals, which is necessary in connection with the use of a delay control unit 6, a differentiating chain 10, an amplitude selector 11 and a driver 12. In As a voltage meter, practically any instrument acceptable for the measurements being made, such as a peak voltmeter, can be used: a correlometer, a spectrum analyzer, etc.

When using the proposed device, the prod increases by 1.5-2 times. water content of operators and reduced requirements for their qualifications.

Form m, a la invention

A device for measuring distortions recorded and reproduced in magnetic signal recording equipment, consisting of three consecutive electrical circuits, the first of which contains the generators of the reference and test signals, the second — the magnetic recording apparatus under investigation, the subtraction unit and the meter, respectively, and one third the former, the second test signal generator and the voltage regulator, so that, in order to automate the measurement processes with a simultaneous increase in the accuracy of the output ata, it is equipped with a delay control unit connected between the output of the reference signal generator and the input of the second test signal generator; connected in series by a differentiating circuit and an amplitude selector connected between the input of the subtractor and the former, as well as two low-pass filters, one of which is on, waiting for the output of the first generator of the test signal and the input of the magnetic recording device under study, and the second between the output of the controller voltage and other input of the subtraction unit.