SU1302318A2 - Device for reproducing digital information from magnetic medium - Google Patents

Abstract

The invention relates to magnetic recording and allows increasing the noise immunity of the device. When a single pulse arrives on the input bus 5 of the information signals, the threshold driver 1 generates an enable signal in case this pulse exceeds the threshold level. This signal allows the passage through the element 3 on the trigger 4 short gating pulse generated by the shaper 7 clock signal on the sync pulse received on the input bus 10 clock signal. The enable signal from the threshold driver 1 is also fed through the delay element 12 to the trigger 14 and to the element 13, due to triggering the trigger 4, the element 13 influences the trigger 14, which prohibits the passage of the short gate pulse of the synchronizer 7 generator through the element 3 to trigger 4. If a single pulse on the input bus 5 of the information signals reaches the level of the release threshold, then the threshold driver 1 changes its output signal, which through the delay element 12 goes to the trigger 14, ing permits passage of the next pulse from the input unit 5 of tires information signals to a trigger 4. 1 yl. sl nz NJ

Description

The invention relates to magnetic recording, in particular, to devices for reproducing digital information from magnetic media, and is an improvement of the device according to the basic author. St. No. 1081654.

The aim of the invention is to improve noise immunity.

The drawing shows one of the possible versions of the Device for reproducing digital information from magnetic media.

The device contains channels of information signals, each of which consists of a threshold driver 1 of the first 2 and second 3 elements AND, trigger 4, input 5 and output 6 buses of information signals, and a sync signal channel consisting of the driver 7 of the synchronization signal, a single vibrator 8, a differentiating circuit 9, input 10 and output 11 clock sync.

In each channel of the information signals, the input of the threshold driver 1 is connected to the input bus 5 of the information signals, and the output of the first element I 2 is connected to the output bus 6 of the information signals. In this case, the first input of the first element And 2 is connected to a single output of the trigger 4.

In the sync signal channel, the sync signal input bus 10 is connected to the sync signal generator 7 input, and the output of the differentiating circuit 9 is connected to the zero inputs of the triggers 4 of all information signal channels. The output of the synchronization signal generator 7 is connected to the first inputs of the second elements And 3 of all channels of information signals, also through the one-shot 8 to the second inputs of the first elements And 2 of all channels of information signals, the output bus I1 of the synchronizing signal and the input of the differentiating circuit 9.

In each channel of information signals, the output of the threshold shaper 1 is connected to the second input of the second element I 3, the output of which is connected to the single input of the trigger 4.

Each channel of information signals is also provided with a delay element 12 connected by an input to the output of the threshold shaper 1, a third And 13 element connected by a first input to a single output of a trigger 4, and an additional trigger 14 connected by an output to the third input of the second And 3 element. In each channel of the information signals, the output of the delay element 12 is connected to the single input of the additional trigger 14 and the second input of the third And 13 element connected to the output with the zero input of the additional trigger Hera 14.

Reproduction of digital information from magnetic media is as follows.

With a single impulse

in the input bus 5 of information signals, the threshold driver 1 generates a enable signal in case this pulse reaches the trigger threshold level. This threshold signal allows the passage through the second element And 3 on

About trigger 4 short gating pulse generated by the shaper 7 clock signal on the clock pulse, coming through the input bus 10 clock signal. The permissive signal from the threshold driver 1 is also fed through delay element 12 to additional trigger 14 and to third element 13. In addition, due to trigger 4, the third element 13 influences additional trigger 14, which prevents the driver from passing a short gate 7 clock signal through the second element And 3 on the trigger 4. If a single pulse on the input bus 5 information signal reaches the level of the release threshold, the threshold driver 1 changes its output signal which, via element 12, of the delay arrives at an additional trigger 14. The latter permits the passage of the next single pulse from the input,. bus 5 information signals on the trigger 4.

The single-oscillator 8 generates pulses of a given duration on the output tires 6 information signals and on the output bus 11 clock signal. In this case, the trigger 4 allows the passage of a one-shot pulse through the first element And 2 on the output. bus 6 information signals. The rear edge of the pulse of the one-shot 8 sets the trigger 4 to the zero state, which provides preparation for the next single pulse on the input bus 5 of information signals.

Claims (1)

Invention Formula A device for reproducing digital 5 information from magnetic media by author. St. No. 1081654, characterized in that, in order to increase the noise immunity, each channel of information signals is provided with a delay element, a sub-input to the output of the threshold 0 generator, a third AND element connected by the first input with a single trigger output, and an additional trigger connected by the output to the third input of the second element And, and in each channel of information signals the output of the delay element is connected to the single input of the additional trigger and to the second input of the third element And connected to you move with zero input additional trigger. five