SU1476531A1 - Maximum value detector of playback from magnetic recording medium - Google Patents

Abstract

The invention relates to the accumulation of information and allows to increase the accuracy of the reproduced signals by determining the maximum amplitude values of the recorded signals of the studied oscillatory processes in the sections of the scale. In the device of the former 3, 4, the sections of the positive and negative half-waves are picked up from the reproduced signal. By forming the output voltage, the maximum value is generated using a half-wave interpolation with a half-wave sinusoid. The maximum value is substituted into one of the points of the corresponding half-wave, for example, with a zero value. In the absence of overshoots, the reproduced signal after amplification and demodulation enters the output of the device. In the presence of a section through the elements AND 8, OR 10, 11, the signal about the maximum amplitude values is additionally mixed into the output signal. 1 il.

Description

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The invention relates to information storage systems, namely, devices for determining maximum values of a reproduction result from a magnetic recording medium.

The purpose of the invention is to improve the accuracy of determining the maximum values of the result of reproduction from a magnetic recording medium.

The drawing shows a diagram of an apparatus for determining the maximum values of a reproduction result from a magnetic recording medium, an exemplary embodiment.

The device contains the first 1 and second 2 threshold elements connected by outputs to the inputs of the first 3 and second 4 pulse generators, respectively, and connected by inputs to the output of the reproduction amplifier 5 connected by an input to a reproducing magnetic head 6, coupled to a magnetic recording medium being moved relative to it , delay element 7, AND element 8, time interval meter 9, first 10 and second 11 OR elements and output bus 12. At that, delay element 7 is connected to the first input of AND 8 element by the output,

The device also includes a double-sided limiter 13 connected between the output of the amplifier 5 and the first input of the element 8, the first voltage divider 14, the first subtraction unit 15, the first voltage multiplier 16, the first sine signal generator 17 and the second voltage divider 18 connected in series between the first output of the time interval meter and the first input of the first element OR 10, the third voltage divider 19, the second subtraction unit 20, the second voltage multiplier 21, the second signal conditioner 22 cone 23 and the fourth voltage divider connected in series between the second output of the meter 9 slots and the second input of the first OR gate 10, NOT element 24 and the first 25 and second 26 additional time slots meters. The element 24 is connected by an output to the second input of the element AND 8 and is connected by an input to the output of the first element OR 10 connected

with the first input of the second element OR 11. The second element OR 11 is connected by a second input to the output of the element AND 8 and connected to the output to the output bus 12. The first 25 and second 26 Additional time interval meters are connected by inputs to the outputs of the first 3 and second 4 pulse shapers, respectively. In this case, the outputs of the first 25 and second 26 additional time interval meters are connected to the inputs of the first 14 and third 19 voltage dividers, respectively, and the output of the playback unit 5 is connected to the input of the delay element 7.

A device for determining the maximum values of the result of reproduction from a magnetic recording medium operates as follows.

The result of recording an analog signal, for example, a signal of vibratory processes of rotating mechanisms, is reproduced from the magnetic recording medium of the reproducing magnetic head 6 and is fed to the reproducing unit 5. The playback result from the output of the playback unit 5 is supplied to the first 1 and second 2 threshold elements, the double-sided limiter 13 and the delay element 7. From the output of playback unit 5, the playback result from the magnetic recording medium is received, the maximum amplitude values of which are distorted due to a two-way amplitude limitation. The first 1 and second 2 threshold elements are separated from the result of the reproduction by sections of the over-reach for the boundary of the upper and lower ranges of measurements, respectively. At the same time, the double-sided limiter 13 forms a signal in the form of a meander at zero levels, and the first 3 and second 4 pulse shapers are rectangular pulses characterizing the sections of the overwhelm. At this, time interval meter 9 measures the duration of half periods of positive and negative half waves, time intervals - the duration of the sections of the off-scale positive half-waves, and the second additional meter 26 time intervals - the duration of the sections of the off-scale atelnyh half-waves.

The meter 9 time intervals and the first additional meter 25 time intervals affect the first voltage divider 14. The first voltage divider 14 generates a signal that is equal to the ratio of the duration of the portion of the positive half wave to the magnitude of the positive half wave. The first subtraction unit 15 generates a signal characterizing the result of subtracting from the unit of the ratio of the duration of the section of the positive half-wave to the duration of the positive half-wave. The first voltage multiplier 16 generates a signal characterizing the result of multiplying the signal of the first subtraction unit 15 by

coefficient . First shaper

17, the sine signal generates a signal characterizing the sine of the number determined by the signal of the first multiplier of 16 voltages. The signal of the first shaper 17 of the sine signal is fed to the second voltage divider 18, ensuring its division by a specified number of times.

The meter 9 time intervals and the second additional meter 2 time intervals affect the third voltage divider 19. The third voltage divider 19 generates a signal equal to the ratio of the duration of the negative half-wave gap section to the negative half-wave duration. The second subtraction unit 20 generates a signal characterizing the result of subtracting from the unit of the ratio of the duration of the section for the negative half-wave to the length of the negative half-wave. The second voltage multiplier 21 generates a signal characterizing the result of multiplying the signal of the second subtraction unit 20 by

1G coefficient -. Second shaper

22, the sine signal generates a signal characterizing the sine of the number determined by the signal of the second voltage multiplier 21. The signal of the second shaper 22 of the sine signal is fed to the fourth voltage divider 23, which ensures its division by a specified number of times.

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Claims (1)

If there is an off scale in the positive and negative half-waves, the second 18 and fourth 23 voltage dividers, respectively, through the first 10 and second 11 elements OR 10 and 11, respectively, receive signals on the output bus 12 that characterize the maximum amplitude values of the playback result from the magnetic recording medium. At the same time, the signal from the output of the first element OR 10 through the element NOT 24 locks the element AND 8. At other times, the output bus 12 through the delay element 7, the element 8 and the second element OR 11 from the output of the playback unit 5 receives the result of reproduction from the magnetic recording medium . Invention Formula A device for determining the maximum values of the playback result from a magnetic recording medium, comprising first and second threshold elements connected by outputs to the inputs of the first and second pulse shapers, respectively, and connected by inputs to the output of a playback amplifier connected to the input with a reproducing magnetic head, a delay element connected by the output to the first input of the AND element, the time interval meter, the first and second OR elements, and the output bus, characterized in that To improve the accuracy of determining the maximum values of the playback result, the first voltage divider, the first subtraction unit, the first voltage multiplier, the first sine signal generator and the second voltage divider connected in series between the first output of the time interval meter and the first input of the first element OR are entered into it , the third voltage divider, the second subtraction unit, the second voltage multiplier, the second sine signal generator and the fourth voltage divider, included the last consistently between the second output of the meter slots and the second input of the first OR gate, double-sided limiter connected between the output of the reproducing amplifier and a first input of an AND element 5 14765316 NOT connected by output to second-connected inputs to outputs the input element And and connected, respectively, of the first and second an input to the output of the first pulse-shaping element, and an ORD, connected to the first input inputs of the first and second optional second OR element, of connected time interval meters The second input to the output of the element is connected to the inputs, respectively Both the output connected to the output of the first and third dividers, for example, the bus, and the first and second accessories, and the output of the playback unit time meters, w is connected to the input of the delay element.