SU862208A1 - Device for correcting for time distortions at reproducing from magnetic record carrier - Google Patents

Description

one

The invention relates to the field of magnetic recording, in particular, to devices for correcting temporal distortion during reproduction from a magnetic recording medium.

A device for correcting temporal distortions during reproduction from a magnetic recording medium is known, comprising a reproducing magnetic head connected to the output bus via a reproduction result converter connected to a time correction signal former 1.

The known device has a relatively simple design, but does not allow for the correction of temporal distortion prc reproduction of the recording result with a sufficiently high density.

It is also known a device for correcting temporal distortions during reproduction from a magnetic recording medium, comprising a reproducing magnetic head connected to the input of the first filter connected to the analog-code output connected to the output of the first of the reference frequency generators and to the first of the inputs of the buffer block. memory whose first output is connected

through an automatic speed control unit with a tape mechanism, and a second output through a code converter — to the input of the second filter, the output of which is connected to output bus 2.

This device allows for the correction of temporal distortion when playing back a relatively high density recording result from a magnetic recording medium. The drawback of the device consists in the insignificant error of the result of the correction of temporal distortions during reproduction from the magnetic recording medium.

The purpose of the invention is to reduce the error of the result of the correction of temporal distortion during reproduction from a 15 magnetic recording cell.

This is achieved due to the fact that after the reproduction of a third filter, a fallout compensator, a first mixer, a first band-pass filter, a second mixer, a second band-pass filter, a frequency divider and a pulse shaper, an output which is connected to the second input of the buffer memory unit. In this case, the reproducing magnetic head is connected to the input of the third filter, the output of the second generator of the reference frequency signal to the first mixer, and the output of the third generator of the signal of the reference frequency to the second mixer.

The drawing shows one of the possible variants of the proposed device for correcting temporal distortions during reproduction from a magnetic recording medium.

The proposed device comprises a reproducing magnetic head 1 mounted to interact with a magnetic recording medium, not shown in the drawing, and connected to the input of the first filter 2. The output of the first filter 2 is connected to the converter 3 analog code connected to the output of the first generator 4 of the reference frequency signal and to the first input of the buffer storage unit 5. The first output of the buffer memory unit 5 is connected via the automatic speed control unit 6 and its output bar 7 to a tape drive mechanism not shown in the drawing. The second output of the buffer memory unit 5 is connected via a converter 8 code equivalent to the input of the second filter 9, the output of which is connected to the output bus 10.

The proposed device also includes a third filter 11 connected in series, a fallout compensator 12, a first mixer 13, a first bandpass filter 14, a second mixer 15, a second bandpass filter 16, a frequency divider 17 and a pulse generator 18, the output of which is connected to the second input of block 5 buffer memory. In this case, the reproducing magnetic head 1 is connected to the input of the third filter 1, the output of the second generator 19 of the Reference frequency signal is connected to the first mixer 13, and the output of the generator 20 of the reference frequency signal is connected to the second mixer 15.

In the proposed device, the reproduced main signal is converted into a digital code, which is entered into the block 5 of the buffer memory. From the buffer memory block 5, the digital code is output in accordance with the conversion result of the reference signal allocated by the third filter 11. The digital code is then converted to an analog signal and fed to the output bus 10 through the second filter 9. Using the invention significantly reduces the error the result of the correction of temporal distortion when playing from a magnetic recording medium.

Claims (2)

Invention Formula A device for correcting temporal distortions during reproduction from a magnetic recording medium, comprising a reproducing magnetic head connected to the input of the first filter connected to an analog-code converter connected to the output of the first of reference frequency generators and to the first of the inputs of the buffer memory block, the first output of which is connected via the automatic speed control unit to the tape drive mechanism, and the second output through the coding converter to the input of the second filter, the output of which is connected to the output bus, characterized in that reduce the error of the result of the correction of temporal distortions, a third filter connected in series, a fallout compensator, the first mixer, the first band-pass filter, the second mixer, the second band-pass filter, de it frequency and pulse shaper whose output is connected to the input buffer memory unit, the reproducing conductive magnetic head is connected to the input of the third filter, a second oscillator frequency reference signal output - to the first mixer, and a third oscillator reference frequency signal output - to the second mixer. Information sources, taken into account during the examination 1. G. G. Davis. Application of accurate magnetic recording. M., “Energie, 1967, from 144-156. 2. USSR author's certificate No. 680032, cl. G and 5/45, 1978 (prototype).