SU855727A1 - Device for measuring and checking information being recorded and reproduced - Google Patents

Description

(54) DEVICE FOR MEASURING AND CONTROL OF RECORDED AND REPRODUCIBLE INFORMATION

one

The invention relates to instrumentation and can be used in setting up and controlling tape recorders in terms of their mass production.

A device for monitoring the quality of the recording and playback channels in a tape recorder is known, made on the basis of a generator of signal sequences of different frequencies used in the information recording channel and on the basis of an oscilloscope used in the information playback channel 1.

However, the process of monitoring when using such a device takes a fairly long time, which is associated with the need to carry out the calibration of the collider before each measurement.

Closest to the invention is a device for measuring and monitoring recording and reproducing information, comprising a series of identical input chains, each of which includes a generator of sinusoidal oscillations and a waiting multivibrator connected to different inputs of an analog switch,

associated with the input of the monitored background magnet, the indicator and the oscilloscope 2.

However, using this device also requires time for frequent calibrations. and reorganization of control equipment, which increases the cost of production and leads to increased consumption of electrical energy.

The purpose of the invention is to accelerate the process of controlling tape recorders.

Claims (2)

The goal is achieved by having a device for measuring and controlling recorded and reproducible information, containing a series of identical input chains, each of which includes a sinusoidal oscillator and a standby multivibrator connected to different inputs of an analog switch connected to the input of a monitored tape recorder, an indicator and oscilloscope equipped with serially connected by the first peak detector, subtraction unit and voltage relation meter connected between the output of the monitored tape recorder and the indicator input, serially connected by the operational amplifier and the second peak detector, connected between the same tape recorder output and the second input of the subtractor, as well as an adjustable voltage source connected to the second operating force input of the body, while the oscilloscope is connected to the output of the operational amplifier, and the output the first peak detector is connected to the second input of the ratio meter. The drawing shows a block diagram of the proposed device. The device contains a generator of sinusoidal oscillations 1, is connected to one of the inputs of the analog switch 2, and the waiting multi vibrator 3 is connected to the second input of this switch, the output of which is connected to the input of a controlled tape recorder 4. The generator 1, the switch 2 and the multivibrator 3 form an input chain . There may be several such chains. The output of the tape recorder is connected simultaneously with the inputs of peak detector 5 and operational amplifier 6, the second input of which is connected to an adjustable voltage source 7, and the output simultaneously to both the peak detector 8 and the oscilloscope. The detector 8 is connected via a series of upstream unit 10 and the voltage ratio meter 11 to the indicator 12. The device operates as follows. The first multivibrator is triggered by a pulse arriving from the outside, each subsequent multivibrator is triggered by the posterior edge of the pulse received from the previous multi-vibrator. This allows you to alternately open the keys and thereby give the signals from the respective generators to the input of the monitored tape recorder. Thus, on a magnetic tape (not shown in the drawing), a sequence of signals of different frequencies repetitively recorded is formed, which, when played back on the oscilloscope screen, is a signalogram consisting of signals of different amplitudes, the magnitude of which determines the unevenness of the frequency response of the mashmphoton, t, e. control of the recorded information occurs. A constant voltage is generated at the output of detector 5, corresponding to the amplitude of the maximum signal of the reproduced sequence. Moreover, the signal from the output of the tape recorder also goes to amplifier 6. By adjusting the source 7, the minimum amplitude of the signal is obtained with a zero reference line, for example, on the oscilloscope screen. The unit Yu allows determining the voltage difference signal generated at the outputs of both detectors 5 and 8, and the meter 11 allows at its output to receive a signal that is proportional to the ratio of both voltages, but one comes directly from the detector 5, and the other from block 10 subtraction. The indicator can be graduated in any quantities. If there is a frequency scale on it, then it will be possible to monitor directly the magnitude of the non-uniformity of the frequency response of the tape recorder being monitored. When implementing the proposed device, it is possible to reduce the monitoring time for information recorded on a magnetic tape up to 209. Such a reduction in monitoring time reduces labor costs and saves energy. Apparatus of the Invention A device for measuring and controlling recorded and reproducible information, comprising a series of identical input chains, each of which includes a sinusoidal oscillator and a standby multivibrator connected to different inputs of an analog switch associated with the input of a monitored tape recorder, an indacator and axis, which differs in order to speed up the monitoring process, it is equipped with series-connected first peak detector, subtraction unit and voltage ratio meter, connected between the output of the monitored monitor and the indicator input, connected in series by the operational amplifier and the second peak detector, connected between the same tape recorder output and the second input of the subtraction unit, as well as an adjustable voltage source connected to the second input of the operating terminal, while the oscilloscope is connected to the opamp, and the output of the first. a peak detector is connected to a second input of a voltage ratio meter. Sources of information taken into account in the examination 1. The author's certificate of the USSR N 358968, cl. q 11 B 5/46, 1970. 2. USSR author's certificate N 493741, cl. G 01 R 23/02, 1974 (prototype).