SU1157568A1 - Device for recording-reproducing digital information on video tape recorder - Google Patents

Abstract

DEVICE FOR ZAPISIVOSPROIZVEDENIYA DIGITAL INFORMATION FOR VCR, comprising: a first switching unit connected information input to the first input bus, a clock input - to the first output clock signal of the first oscillator and outputs - to the data inputs of the first and second buffer memories, a second switching unit coupled data inputs to the outputs of the first and second buffer memories, synchronized by their input to the first output of the first sync generator signal and output to the first input of the combining unit connected by the second input to the second output of the first clock signal generator and output to the information input of the video recorder connected by the first and second clock inputs to the third output of the first clock signal generator and the first output of the second clock signal generator, and the output through shaper of the reproduced signal to the input of the separation unit, the third switching unit, the synchronizing input of which is connected to the second output of the second clock generator, the fourth switching unit connected by information inputs to the outputs of the third and fourth memory devices, the synchronization input to the second output of the second clock generator, and output to the first output thickness, and the third switching unit is connected to the information inputs of the third and fourth memory devices, characterized in that, in order to reduce the recording-reproduction error of digital information on a VCR, the second input and output are entered into it a bus, a decoder, an information input connected to the first output of the separation unit, made with a synchronization input and connected by an output to the information input of the third switching unit, a crystal oscillator connected by an output to the clock inputs I of the first and second clock generators, the first and second switches, the first ( L and the second frequency dividers, an adjustable delay element, a pulse counter and a gating unit, the first switch being connected by inputs to the second input bus, to the first The output of the first clock generator and the interconnected pulse counter input, the output of the gating unit and the sync input of the decoder, and the outputs to the synchronization inputs of the first and second memory devices, the gating unit is connected to the output of the first frequency divider, to the output of the counter of pulses , to the second output of the first clock signal generator and through the adjustable delay element to the second output of the separation unit, the second switch is connected to the clock outputs inputs of the third and fourth memory, devices and inputs are connected to the second output of the second clock generator, to the output of the gating unit and to the second output bus connected to each other and to the output of the second frequency divider, while the first and second frequency dividers are connected to the output of the crystal oscillator.

Description

The invention relates to the field of magnetic recording, in particular to devices for recording and reproducing digital information on a VCR.

A device for recording and reproducing digital information is known, comprising a serially connected receiving register, a buffer memory block, a code converter and a control unit connected to a magnetic recorder, a switch connected to the receiving register, a code converter and address counters for memory blocks 1.

The disadvantage of this device is that the recording-reproduction of digital information is significantly flawed. In addition, there are no blocks in the device that allow forming the structure of the recorded signal as a television video signal, as well as generating clock signals and phasing them with a reproduced digital sequence. This prevents the device from being used to record digital information on standard video recorders.

A device for recording digital information on a video tape recorder, comprising a first clock signal generator, generating, in the information recording mode, synchronization pulses for the following systems and connected to the external clock input of the video tape recorder, is connected to the first clock signals from the control inputs to the first clock signal generator. recording and reading information between the first and second buffer storage devices, - the first buffer storage device, connecting Connected with the output of the first and the input of the second switching device, the second buffer storage device connected to the output of the first and the input of the second switching device, which, alternately in writing and reading, compresses the input digital sequence in time to the input terminal to place the clock pulses the structure of the recorded signal due to the higher speed of reading information than its recording (the volume of each buffer storage device is equal to the number of binary symbols to be placed on the line of the television signal). The device also contains a first clock generator that generates clock frequencies for the operation of the first and second buffer memory devices and is connected to their control inputs, a digital converter that converts the input digital signal into one of the codes, allowing clock synchronization to decipher the digital sequence and connected to the output of the second switching device, the combination of synchronization pulses of the following systems of the VCR with the digital the second signal is connected to the output of the digital converter and the input of the video recorder, the second clock signal generator, in the information playback mode, generates synchronization pulses for tracking systems and is connected to the external synchronization input of the video recorder, shaper, correction and recovery form of the reproduced signal connected to the video recorder output, the selection circuit of the horizontal sync pulse and the digital sequence from the general structure of the reproduced signal, nennuyu yield shaper. In addition, the device has an inverse digital converter that performs the inverse conversion of the signal to the source code and is connected to the output of the allocation circuit, the third and fourth switching devices connected via the control inputs to the second clock generator and switching between the third and fourth buffer storage devices, third buffer storage device connected to the output of the third and the input of the fourth switching device, fourth buf A pry memory device connected to the output of the third and input of the fourth switching devices, which, alternately in writing and reading, restore the original transfer rate of the digital sequence due to the higher speed of recording information in the BZU than its reading, the second clock generator, forming clock frequencies for operation of buffer memories and connected to their control inputs, an output busbar connected to the output of the fourth switching device 2.

However, the known device is characterized by an insufficiently small error in recording-reproducing digital information on the video recorder.

The purpose of the invention is to reduce the error of recording-reproducing digital information on a video recorder.

The goal is achieved by the fact that in a device for recording and reproducing digital information on a VCR, containing the first switching unit connected by an information input to the first input bus, the synchronizing input — to the first output of the first clock signal generator — to the information inputs of the first and second buffer memories devices, the second switching unit connected by information inputs to the outputs of the first and second buffer storage devices, the synchronization input to the first The output of the first clock signal generator and the output to the first input of the combining unit connected by the second input to the second output of the first clock signal generator and the output to the information input of the video recorder connected to the third output of the first clock signal generator and the first output of the second clock signal generator respectively and the output through the shaper of the reproduced signal to the input of the separation unit is the third switching unit, the synchronizing input of which is connected to the second output of the second clock generator; a fourth switching unit connected by information inputs to the outputs of the third and fourth memory devices; a clock input to the second output of the second clock generator, and an output to the first output bus; the third switching unit is connected to the information inputs by the outputs the third and fourth memory devices, entered the second input and output buses, a decoder, information input connected to the first output of the separation unit, Complete with a clock input and connected to the information input of the third switching unit, a crystal oscillator connected to the clock inputs of the first and second clock generators, the first and second switches, the first and second frequency dividers, an adjustable delay element, a pulse counter and a gating unit, The first switch is connected by inputs to the second input bus, to the first output of the first clock signal generator and to the pulse counter connected to each other, output the gating unit and the synchronizing input of the decoder, and the outputs to the synchronization inputs of the first and second storage devices, the gating unit is connected by inputs to the output of the first frequency divider, to the output of the pulse counter, to the second output of the first clock signal generator and through the adjustable delay element to the second output separation unit, the second switch is connected by outputs to the synchronization inputs of the third and fourth memory devices and inputs connected to the second output of the second generator si This signal is provided with the output of the gating unit and with the second output bus connected between them and the output of the second frequency divider, with the first one. and second dividers

frequency connected inputs to the output of the crystal oscillator.

The drawing shows a block diagram of a device for recording-reproducing digital information on a VCR.

The proposed device contains the first switching unit 1 connected by the information input to the first input bus 2, the synchronizing input to the first output of the first clock generator 3, and the outputs to the information inputs of the first 4 and second 5 memory devices, the second input bus 6, the second block 7 switching, connected by information inputs to the outputs of the first and second storage devices 4 and 5, the sync input to the first output of the first clock generator 3 and the output to the first input of block 8 The second input is connected to the second output of the first oscillator 3 clock signal and the output to the information input of a VCR 9 connected to the first and second clock inputs 3 and the first output of the second clock generator 10, respectively, and output through the second clock generator 10, respectively. the reproduced signal to the input of the separation unit 12, the decoder 13, the information input connected to the first output of the separation unit 12, made with a synchronization input and the output of the output to the information input of the third switching unit 14, the synchronization input of which is connected to the second output of the second clock generator 10, a crystal oscillator 15 connected by an output to the clock inputs of the first and second clock generators 3 and 10, the fourth switching block 16 connected with information inputs to the outputs the third and fourth memory devices 17 and 18, the sync input to the second output of the second clock generator 10, and the output to the first output bus 19, second th output line 20, and

5, the third switching unit 14 is connected by outputs to the information inputs of the third and fourth memory devices 17 and 18. In addition, the device comprises first and second switches 21 and 22, first and second frequency dividers 23 and 24, an adjustable delay element 25, a pulse counter 26 and gating unit 27. The first switch 21 is connected by inputs to the second input bus 6, to the first output of the first generator 3 clock signal and to the interconnected input of the counter 26

5 pulses, the output of the gating unit 27 and the synchronization input of the decoder 13, and the outputs - to the synchronization inputs

the first and second memory devices 4 and 5. The gate unit 27 is connected by inputs to the output of the first frequency divider 23, the output of the pulse counter 26, the second output of the first clock generator 3 and through the adjustable delay element 25 to the second output of the split unit 12. The second switch 22 is connected by outputs to the clock inputs of the third and fourth memory devices 17 and 18 and is connected to the second output of the second clock generator 10, to the output of the gating unit 27 and interconnected by the second output bus 20 and the output of the second frequency divider 24. In this case, the first and second dividers 23 and 24 frequencies are connected by inputs to the output of the crystal oscillator 15.

In the information recording mode on the video tape recorder 9, the first clock signal generator 3, synchronized by the crystal oscillator 15, generates a standard television clock signal, which is fed to the external synchronization input of the video tape recorder 9, and a horizontal clock pulse, kneaded into the structure of the recorded signal.

The input to the first switching unit 1 via the input bus 2 is a continuous digital sequence in the form of a BVN code by means of the first clock signal generator 3 and is switched by zones containing a constant number of binary symbols placed on the line of the television signal.

Variable recording of information zones in the first and second memory devices 4 and 5 is performed by an input signal clock frequency inputted through the second input bus 6 to the input of the first clock switch 21 and switched between the first and second memory devices 4 and 5 by the first clock signal generator 3. Alternating reading of information zones from the first and second storage devices 4 and 5 is performed more than when writing a clock frequency, which compresses the input digital sequence for the time required to mix the horizontal sync pulse into the structure.

The read clock frequency is generated in the first frequency divider 23 of the signal of the crystal oscillator 15 and output to the first switch 21 clock frequencies via a gate unit 27 opened by the horizontal sync pulse generated in the first generator 3 of the clock signal. The pulse counter 26 records the number of binary symbols placed on the line of the television signal and closes the block.

27 gating. Alternately read from the first and second storage devices 4 and 5 of the information zone are combined by the second switching unit 7 in a single digital stream having gaps for mixing the horizontal sync pulse.

The combination of the horizontal sync pulse with the digital stream, which enters the input of the combining unit 8 from the output of the second switching block 7, is such that the temporary alignment of the horizontal sync pulse and the information bits is constant in each television line thus formed. This is achieved by the fact that the clock pulses of reading information from the first and second storage devices 4 and 5 and the horizontal sync pulse, kneaded into the read information, are formed by recalculation from the same crystal oscillator 15. From the output of block 8, the digital information signal of the BVN code with inserted In it, the horizontal sync pulses in the form of lines of a television video signal are fed to the video input of the VCR 9 synchronously with the full television sync signal received at the input of the external synchronous VCR 9.

In the playback mode information from a VCR second generator 10

The clock signal Q, synchronized by the crystal oscillator 15, generates a complete television clock signal, which is fed to the external synchronization input of the VCR 9, while the reproduced digital information signal of the code

5 BVN B in the form of TV video lines is fed to the input of the imager 11 of the reproduced signal with a residual time error depending on the type of the VCR 9. The signal corrected in the imaging unit 11 is fed to the input of the separation unit 12, where by amplitude selection, the levels of horizontal sync signals are different and digital sequence signals. A dedicated horizontal sync pulse from the output of dividing unit 12 via adjustable delay element 25 opens the input of gating unit 27 for clock pulses generated in the first frequency divider 23 from a quartz oscillator signal 15. From the output of gating unit 27, clock pulses generated similarly to the clock pulses with which the digital stream was formed in the mode of recording information on the video tape recorder 9. is fed to the input of the decoder 13. the effectiveness of BVN from selected in block 12 of the division of information

Claims (1)

A DEVICE FOR RECORDING DIGITAL INFORMATION ON A VCR, containing a first switching unit connected by an information input to the first input bus, a synchronizing input to the first output of the first clock generator and outputs to information inputs of the first and second buffer memories of the devices connected to the outputs of the first and second buffer storage devices, the synchronizing input to the first output of the first clock generator la and output - to the first input of the combining unit, connected by the second input to the second output of the first clock generator and output - to the information input of the VCR connected by the first and second clock inputs, respectively, to the third output of the first clock generator and the first output of the second clock generator, and the output through shaper of the reproduced signal to the input of the separation unit, the third switching unit, the synchronizing input of which is connected to the second output of the second generator and the clock signal, the fourth switching unit, connected by information inputs with the outputs of the third and fourth storage devices, the synchronizing input - with the second output of the second clock generator, and the output - with the first output bus, and the third switching unit is connected by outputs to the information inputs of the third and fourth storage devices , characterized in that, in order to reduce the error of recording-playback of digital information on a VCR, the second input and output buses, deco ery, an information input connected to the first output of the separation unit, made with a synchronizing input and connected to the information input of the third switching unit, a crystal oscillator connected by an output to the synchronizing inputs of the first and second clock generators, the first and second switches, the first and second frequency dividers, an adjustable delay element, a pulse counter and a gating unit, the first switch being connected by inputs to the second input bus, to the first output of the first generator and the clock signal and to the interconnected input of the pulse counter, the output of the gating unit and the synchronizing input of the decoder, and the outputs to the synchronizing inputs of the first and second storage devices, the gating unit is connected by inputs to the output of the first frequency divider, to the output of the pulse counter, to the second output of the first the clock generator and through the adjustable delay element to the second output of the separation unit, the second switch is connected by the outputs to the synchronizing inputs of the third and fourth their "devices and the inputs connected to the second output of the second clock generator, with the output strobe unit and interconnected with the second output line and the output of the second frequency divider, wherein the first and second frequency dividers are connected to the inputs of the crystal oscillator output. SU „„ 1157568