SU429451A1 - MAGNETIC RECORDER - Google Patents

Description

: one

The invention relates to instrumentation engineering, in particular to magnetic recording devices used in the registration and processing of test results of various kinds of products by the influence of oscillations of continuously varying frequency.

Magnetic recorders are known that contain recording units with modulators, a playback unit, an aperture frequency signal source, and a driving motor with a speed controller.

However, such devices do not provide a sufficiently high accuracy and simple analysis of test results, and their magnetic tape consumption is relatively large.

The purpose of the invention is to improve the accuracy and simplify the analysis of test results, reducing the consumption of magnetic tape.

This goal is achieved by introducing into the proposed device a control unit of the carrier frequency of the modulators, the input of which is connected to the exciter frequency sensor, and the output to the modulators of the recording unit, where the reference frequency source and the exciter frequency sensor are connected to the drive motor speed controller -play.

The operation of the device is based on the agreement of the instantaneous recording speed and the carrier frequency of the modulators - with the frequency value

excitement. Reproduction is performed at a constant speed of pulling the magnetic tape.

The drawing is a block diagram of the proposed magnetic recorder.

The device contains the actual magnetic recorder 1; modulators of blocks 2 records; a unit 3 for controlling the carrier frequency of the modulators; sensor 4 frequency exciter; drive speed regulator 5; switch 6 record-play; reference frequency source 7; playback units 8; channel 9 for recording and reproducing the reference frequency signal,

The output of the magnetic recorder 1 receives signals from sensors that record the state of the object during tests by the action of oscillations of continuously varying frequencies, which are generated by the pathogen.

(the test object, the sensors fixing its state, and the exciter of continuously varying frequencies are not shown in the drawing). In the recording unit modulators 2 sensor signals

converted to pulse signals modulated in width or frequency (PWM, PFM) or converted to analog-to-digital (KIM) type. The carrier frequency of the modulators 2 is changed by the control unit 3 so that

ratio of the instantaneous frequency of the exciter to

the carrier frequency of the modulators remains constant. At the same time, the signal from sensor 4 connected in recording mode to controller 5 via switch 6 controls the rotation speed of the driving motor shaft (recording speed) according to the change in the frequency of the exciter and so that the recording density of the signals on the magnetic tape remains constant. Due to such a consistent change in carrier frequency and recording speed, the consumption of magnetic tape is reduced. During playback, the speed at which the magnetic tape is pulled is kept constant by means of a source 7 connected via switch 6 to controller 5. Therefore, the frequency of the demodulated signals is on. the output of blocks 8 is kept constant throughout the entire test time, while the frequency at the output of channel 9 will vary and contain information about the instantaneous frequency of the exciter.

Improving the accuracy and simplifying the analysis of the test results is achieved by processing the results at a constant frequency, which eliminates the dynamic error in the reorganization of the analyzing device and simplifies it.

Prdmet invention

Magnetic recorder used in testing products by oscillation with a continuously varying frequency, containing an exciter frequency sensor, recording units with modulators, playback units, a reference frequency signal source connected to the reference-frequency recording-playback channel, a record-playback switch and A leading motor with speed control, characterized in that, in order to reduce the consumption of magnetic tape, increase accuracy and simplify the analysis of test results, A horn is inserted into the modulator carrier frequency control unit, the input of which is connected to the exciter frequency sensor, and the output is connected to the modulators of the recording unit, the reference frequency source and the exciter frequency sensor being connected to the speed controller of the drive motor via a record-play switch.