SU892471A1 - Magnetic recording device - Google Patents

Description

I

The invention relates to a magnetic recording technique, in particular to recording devices with non-linear distortion compensation.

A nonlinear distortion compensator is known, comprising a recording amplifier, connected to the recording head {k: and, a converter whose output is connected to the recording amplifier, and a series of parallel frequency-dependent feedback circuits connected between the recording head and the input of the converter 1.

Insufficient compensation of nonlinear distortions in the known device is due to the fact that the circuits of the swasi do not cover the magnetic holes and the carrier.

The closest E to the proposed technical essence and the achieved result is a device in which the correction of the current value of the signal is carried out taking into account the signal value recorded on the carrier.

na The device contains a pre-amplifier, a playback head, a first analog-to-digital converter, the input of which is connected to the output of a pre-amplifier, an adder, an analog-to-analog converter and a recording head connected to the output of the digital-to-analog converter f 2.

However, elements and connections of the second device allow the current value of the signal to be corrected by the algorithm average for this type of device, i.e., without taking into account the nonlinearity of the head circuit characteristic

15 carrier - the head used in the device.

The purpose of the invention is to reduce nonlinear distortion.

For this purpose, the device is equipped

Claims (2)

20 an additional recording head, a second analog-to-digital converter and two digital delay lines, one of which is connected between the output of the adder and the input of the digital-analogue converter, and the other between the output of the first analog-digital conversion and the first input of the adder, the second input of which is connected with the output of the second analog-digital converter, with an additional recording head connected to the output of the preamplifier, and the playback head is connected to the input of the second analog-digital th converter and installed between the recording heads. The drawing shows a block diagram of the device. The device contains a preamplifier 1, a first analog-to-digital converter 2, a digital delay line 3, an adder 4, a digital delay line 5, an analog-to-analog converter 6, a recording amplifier 7, a playback amplifier 8, a second analog-to-digital converter 9, a strobe generator 1O, a recording head 11, an additional recording head 12 and a playback head 13. The device works as follows. The analog signal is fed to the input of the preamplifier 1, from the output of which the head 12 is recorded on the carrier 14, the recorded signal is reproduced with a certain delay by the head 13 and after inversion in the amplifier 8 is sent to the analog-to-digital converter 9, from the output of which the digital code goes to one from the inputs of the adder 4. At the same time, the input of the adder 4 is fed from the analog-digital converter 2 through the delay line 3 to the digital code of the input signal. The delay time in line 3 is equal to the playback delay time from keep The amplification factor of the playback bodies 8 is set so that, in the absence of distortion, the signal levels (in digital form) at the inputs of the adder 4 would be the same. If there is a claim: the variability of the instantaneous values of the signals on the inputs of the adder 4 gives an error signal which from the output of the adder 4 through the 14th digital line 5 of the delay 5 and the digital-to-analogue converter 6 is fed to the recording amplifier 7 and further to the recording head 11 the carrier 14 is corrected into the value of the recorded signal. Digital delay line 5 provides for phasing of the recorded and correction signals. The control of the digital elements of the device is carried out from the generator 10 gating pulses. The invention will reduce the non-linear distortions arising in the process of magnetic recording. The invention includes a magnetic recording device comprising a preamplifier, a reproduction head, a first analog-to-digital converter, the input of which is connected to the output of the preamplifier, an adder, a digital-to-analog converter and a recording head connected to the output of the digital-to-analog converter, which differs from that with a non-linear distortion reduction circuit It is equipped with an additional recording head, a second analog-to-digital converter and two digital delay lines, one of which is the other is connected between the output of the adder and the input of the digital-to-analog converter, and the other between the output of the first anapic-digital converter and the first input of the adder whose second terminal is connected to the output of the analog-and-transducer, while the additional recording head is connected to the output of the preamplifier, and the playback head is connected to the input of the second analog-and-digital converter and is installed between the recording or the recording, sources of information taken into account in the examination 1; Author's testimony of the USSR № 6OO600, cl. at 11 B 5/45, 1976. 2. US patent No. 39886О2, cl. 235-150.1, 1976 (prototype).