SU902061A1 - Device for digital magnetic recording and reproducing of analogue information - Google Patents

Description

(54) DEVICE FOR DIGITAL MAGNETIC RECORDING AND REPRODUCTION OF ANALOG INFORMATION

one

The invention relates to magnetic recording, in particular, to devices for digital magnetic recording and reproduction of analog information.

A device for digital magnetic recording and playback of analog information is known, comprising a magnetic recording channel, a magnetic recording playback channel, and an electronic speed controller of a tape drive engine 1.

This device has a relatively simple design, but does not provide a sufficiently high fidelity for reproducing similar information.

It is also known a device for digital magnetic recording and playback of analog signals, comprising an input bus connected via a serially connected input amplifier, analog-digital converter and recording and playback amplifier to the magnetic head, a generator connected to the control input of the analog-digital converter and the first the input of the control unit, the second output of which is connected to the motor of the tape mechanism, a digital-to-analog converter connected via the output

an amplifier with an output bus, the input of the digital-to-analog converter through the playback amplifier and a switch connected to the magnetic head, and a synchronization unit connected to the output of the playback amplifier by controlling the input of the digital-analog converter 2.

The purpose of the invention is to increase the true: reproduction of analog information.

This goal is achieved due to the fact that a buffer storage device, a reversible counter, the first input of which is connected to the control input of the analog-digital converter, are entered into the device for digital magnetic recording and playback of analog information, the second input - to the output of the synchronization unit, the control input - to the first output of the control unit, and the output to the second input of the control unit, with the first input of the buffer accumulator connected to the first input of the reversing counter, the second input to the second input of the reversing the third input is to the first output of the recording and playback amplifier, and the output is connected to the input of a digital-to-analog converter.

The drawing shows a block diagram of a device for digital magnetic recording and playback of analog information.

The device contains an input bus 1, an input amplifier 2, an analog-to-digital converter 3, an amplifier 4 for recording and reproducing, a magnetic head 5, a generator 6, a control unit 7, a motor 8 of a tape drive mechanism 9, a digital converter 10, an output amplifier 11 output bus 12, a synchronization unit 13, a buffer storage 14 and a reversible counter 15.

The device works as follows.

In the analog information recording mode, the signal from the input bus 1 through the input amplifier 2 is fed to the first input of the analog-digital converter 3. Using pulses from the output of the generator b, analog 4: this information is converted into digital form by the analog-digital converter 3 and fed to the first the input of the recording and reproduction amplifier 4, from the output of which the digital signal is fed to the magnetic head 5, is recorded on a magnetic recording medium, pulled by a tape-driving mechanism 9 driven by a motor The engine 8, and the engine 8 is controlled from the third output of the control unit 7. In the analog information playback mode, the Digital information from the magnetic recording medium through the magnetic head 5 is fed through the amplifier 4 to record and play back to the input of the synchronization unit 13 and to the third input of the buffer accumulator 14, and from the generator 6 output the signal goes to the first inputs of the buffer accumulator 14 and reversing the counter 15, and from the output of the synchronization unit 13 to the second inputs of the reversible counter 15 and the buffer accumulator 14.

The digital information is written to the buffer memory 14 by pulses from the output of the synchronization unit 13, each pulse increasing the number recorded in the reversing counter 15 by one. The readout of information words from the buffer accumulator 14 is effected by pulses from the output of the generator 6, with each pulse reducing the number written in the reversible counter 15 by one. Thus, the reversible counter 15 contains information about the number of information words stored in the buffer storage 14, the information word read from the buffer storage 14 is fed to the input of the digital-to-analog converter 10, is converted by it into an analog signal, and through the output amplifier G enters the output bus

12. Depending on the current information content of the reversible counter 15, the control unit 7 controls the speed of rotation of the motor 8 of the tape drive mechanism 9 within certain limits. Improving the fidelity of reproducing analog information is determined by the fact that the analog-digital and digital-analog conversion occurs at a rate that depends only on the frequency of the generator 6.

The use of the invention allows to significantly increase the fidelity of reproduction of analog information while reducing the requirements for the motor and nodes of the tape drive mechanism, which allows reducing

its cost.

Claims (2)

1. Magnetic recording. Ed. V. G. Korolkova, M., “Peace, 1966, p. 237-244. 2. US patent number 3786101, cl. G 11 5/02, 1974 (prototype).