SU402904A1 - DEVICE FOR MEASUREMENT OF TRANSITION CHARACTERISTICS - Google Patents

Description

one

The invention relates to the field of instrumentation and can be used to perform measurements in the path of magnetic recording apparatus with increased accuracy.

Devices are known for measuring the frequency characteristics of magnetic recording apparatus, comprising switches, reference and test signal generators, as well as recording and reproducing channels.

Using known devices, the frequency characteristics are measured, and then the transient response is calculated. Such a technique is very complex and, moreover, it does not allow to judge with sufficient accuracy the accuracy of the transient response.

In order to improve the measurement accuracy, the proposed device is equipped with a delay unit and a shift register connected through a switch to the reference signal generator, performing the function of a test signal generator, as well as connected to the shift register via another switch by a correlator connected to one pair of recording and playback channels for the purpose of feedback made to the same switch, with the other pair of identical channels connected between the reference signal generator and the delay unit.

The drawing shows the electrical block diagram of the described device.

In the recording mode, the reference signal from generator 1 is fed to the shift register 2 and starts it. Due to the presence of a feedback loop, the register generates a periodic pseudo-random sequence of signals, which as test signals are fed to the input of channel 3 of the recording. At the same time, a reference signal from oscillator 1 is input to the recording channel 4. Thus, a reference signal and a test signal synchronous with it are recorded on magnetic media. In playback mode, the reference signal from channel 5 is fed to block 6 of the delay and then to regregst 2. The latter generates

a reference signal of the same kind as the test signal had at the input of the measured channel with zapps. The output of the measured channel 7 reproduces the previously recorded test signal, distorted by transients. This signal is applied to a correlometer 8, to the second input of which, through switch 9, a reference signal is fed from register 2.

Changing the magnitude of the shift using the block 6 delay, consistently remove the entire characteristic.

Subject invention

A device for measuring transient characteristics of magnetic recording apparatus,

containing switches, reference and test signal generators, as well as recording and playback channels, characterized in that, with the purpose of improving measurement accuracy, it is equipped with a delay unit and shift register, which performs the function of the test signal generator through a switch with a reference generator; signal.

as well as connected to the shift register via another switch by a correlator connected to one pair of recording and playback channels made for the purpose of feedback connected to the same switch, with the other pair of identical channels connected between the on-signal generator and the delay unit.