SU1314385A1 - Device for phase synchronizing of reproducing channel of digital magnetic tape recorder - Google Patents

Abstract

This invention relates to magnetic magnitude. The purpose of the invention is to improve the synchronization accuracy while simplifying the device by increasing its noise immunity. At the output of register 1, a digital code is generated that is proportional to the phase mismatch of the generator 4 and the clock signal on bus 7. This code is decoded by a digital-to-analog converter 2 to an analog signal, which through the low-pass filter 3 changes the frequency of the generator 4 until generated at the counter outputs The 5 pulses code proportional to the frequency of the generator 4 will not correspond to the bus 7 signal code. The NOT element 6 inverts the most significant bit of the counter of 5 pulses. As a result, the nominal frequency. generator 4 is in the middle of the control range and the noise immunity of the control circuit of the generator 4 increases. 1 sludge. c & (L 00 4 00 СХ) SP

Description

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The invention relates to magnetic recording, namely, devices for phase synchronization of a reproduction channel of a digital magnetic recording apparatus.

The purpose of the invention is to improve the synchronization accuracy while simplifying the device due to its noise immunity.

The drawing shows a functional diagram of an apparatus for phase synchronization of a channel for reproducing a digital magnetic recording apparatus.

The device contains serially connected error block 1, made in the form of a register 1, a digital-analog converter 2, a low-pass filter 3, a controlled oscillator 4 and a pulse counter 5 connected by outputs to the inputs of register 1, a HE element 6 connected between the high-discharge output of the counter 5 pulses and the corresponding input of register 1, while the control bus 7 is connected to the control input of the register K

The device works as follows.

At the output of register 1, a digital code is generated that is proportional to the phase mismatch of the controlled oscillator 4 and the clock signal on the control bus 7. This code is decoded by a digital-to-analog converter 2 to an analog signal through a low-pass filter 3. changes the frequency of the generator 4 until the code generated at the outputs of the counter 5 pulses is proportional to I.Casard's editor. Order 2215/52

Compiled by V.Dobrovolsky Tehred V. Kadar

Circulation 590 VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk, Embankment, 4/5

Production and printing company, Uzhgorod, Projecto st., 4

143852

The oscillator frequency 4 will not correspond to the signal code on bus 7. The element DOES NOT reverse the highest bit of the counter 5 pulses, 5 resulting in the nominal frequency of generator 4 being in the middle of the control range. Due to this, interference immunity of the control circuit of a controlled 10 generator 4 is significantly increased.

Claims (1)

Invention Formula five five A device for phase synchronization of the reproduction channel of a digital magnetic recording apparatus containing series-connected, error block, connected by control input to control line —0, low-pass filter and controllable generator, connected by output to input of error matching unit, about This is because, in order to measure the accuracy of synchronization while simplifying the device by increasing its noise immunity, a pulse counter, an NOT element and a digital-analogue converter are entered into it, as well. the error block is made in the form of a register, with a digital-to-analog converter connected between the outputs of the register and the input of the low-pass filter, the pulse counter is switched between the output of the controlled generator and the inputs of the register, and the element is NOT connected between the output of the higher digit of the pulse counter and the corresponding register input. 0 five Proofreader S.Lyzhova Subscription