SU1545257A1 - Device for reproduction of digital information from magnetic record carrier - Google Patents

Abstract

The invention relates to the accumulation of information and reduces the error in reproducing digital information by reducing the effect of intersymbol interference. The device contains input buses 3 information channels 1 connected to peak detectors 2, the outputs of which are connected to one of the trigger inputs 14, the other inputs of which are connected to the output of the differentiating chain 13, and the outputs to the corresponding inputs of the trigger 6. Other inputs of the trigger 6 are connected to the output element 10 of the delay and the input of the one-shot 11, the output of which is connected to the output bus 12 clock signal and one input elements And 4 information channels 1. The outputs of the elements 4 are connected to the output tires 5 information signals. The input bus 9 of the clock signal is connected via the peak detector 8 of the clock signal with one input of the trigger 15, the other input of which is connected to the output of the differentiating chain 13, and the output to the input of the delay element 10. 1 il.

Description

The invention relates to the accumulation of information and can reduce the error in reproducing digital information by reducing the influence of intersymbol interference "

The aim of the invention is to reduce the error in reproducing digital information by reducing the influence of intersymbol interference,

The drawing shows a structural l · diagram of a device for reproducing digital information from a magnetic recording medium,

A device for reproducing digital information from a magnetic recording medium contains 1 threshold form in each information channel! the squib made in the form of a peak detector 2, connected by an input to the input bus 3 of the information signal, element And 4, connected by the output to the output bus 5 of the information signal, the first input to the first inputs of the elements And 4 information channels 1 and the second input to the output of the first trigger 6 connected by the first input to the first inputs of the first flip-flops 6 of information channels 1, and in the synchronization channel 7, a clock generator, made in the form of a peak detector 8, connected by an input to the input bus 9 of the clock signal delay element 10, connected by the output to the input of the one-shot 1 1, One-shot 11 is connected by the output to the first inputs of the first elements And 4 and to the output bus 12 of the clock signal. In addition, the device contains a differentiating circuit 13 in the channel 7 of the clock signal and in each information channel 1 a second trigger 14, connected by the output to the second input of the first trigger. 6, the first input to the output of the peak detector 2 and the second input to the output of the differentiating circuit 13. In the channel 7 of the clock signal, the device also contains a trigger 15, connected first m the input to the output of the Peak detector 8, the second input to the output of the differentiating circuit 13, connected to the input of the output of the delay element 10, connected to the output of the trigger 15 and the output to the first inputs of the first 'triggers 6,

The device operates as follows.

When reproducing the signals of information units from the output of the peak detectors 2 at the moments of the appearance of the extremum of the playback signal, pulses are allocated that set the triggers 14 to a single state. Similarly, the signal from the peak detector 8 of the clock sets the trigger 15 in a single state, which triggers the element 10 delay. The delay time is less than or equal to half the period of receipt of information T / 2,

At the end of the pulse of the delay element 10, information is transferred from the triggers 14 to the triggers 6 and then the triggers 14 and the trigger 15 are reset through the differentiating chain 13 and at the same time the single-shot 11. starts forming the duration of the output pulses that are read from the triggers 6 through the And 4 elements,

Claims (1)

Claim A device for reproducing digital information from a magnetic recording medium, comprising a threshold driver in each information channel connected to the input bus of the information signal by an input, an element And connected by an output to the output bus of the information signal, the first input to the first inputs of other elements of the information channels and the second input - to the output of the first trigger connected by the first input to the first inputs of the first triggers of the information channels, and in the channel of the clock signal - is formed-. a signal carrier, a delay element connected by an output to the input of a single-vibrator · connected by an output to the first inputs of the first elements AND information channels and the output clock bus, as well as a differentiating chain, characterized in that, in order to reduce the error in reproducing digital information by reducing the influence of intersymbol interference, a second trigger is inserted into each information channel, connected by an output to the second input of the first trigger, and the first input to the output of the threshold driver first in the form of a peak detector, and a second input to the output of the differentiating chain, and a trigger is inserted into the clock channel, connected by the first input to the output of the clock generator, made in the form of a peak detector, and the second input to the output of the differentiating circuit connected by the input to the output of the delay element connected by the input to the output of the trigger of the channel of the clock signal and the output - To the first inputs of the first triggers of the information channels.