SU1448364A1 - Multichannel apparatus for recording and playback of analog information - Google Patents

Abstract

The invention relates to real-time magnetic recording and reproduction apparatus. The goal — to increase the fidelity of reproduction — is achieved by generating a PAM signal with an indication of frame synchronization using a block of 2 amplifiers — a sum

Description

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ditch, block 3 of reference voltage, switch 4, generator 5 clock pulses, block 7 control. The frequency divider 6 provides the formation of a synchronization signal recorded in the pilot recording channel 11. This allows the destabilizing factors of the video tape path to have the same effect on both the synchronization signal and the information signals on all channels. For guaranteed clearances

a clock frequency and a block of 3 reference voltages at the other output generates a signal with a constant level for summation with each information signal. During playback, the inverse transform is performed using the clock frequency sharing unit 14, the control unit 15, the switch 16, the low-pass filter unit 17, the information signal extractor unit 19, the cycle frequency division unit 20. 1 il.

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The invention relates to instrument engineering, in particular to magnetic recording, and can be used to create precision systems for recording and reproducing analog information in real time.

The aim of the invention is to increase the fidelity of reproduction.

The drawing shows a block diagram of the device.

The multichannel device for recording and reproducing analog signals contains N input buses 1, connected

2 summers-adders connected to the inputs of the block, the summing input of which is connected to the output of the block of 3 reference voltages, and the outputs - to the information inputs of the first switch 4, whose additional information input is connected to another output of the block of 3 reference voltages. The device also contains a clock frequency generator 5, connected by an output to the input of a frequency divider 6 directly and through serially connected first control unit 7, first switch 4 and frequency modulator 8 to input of block 9 of VTR 10 magnetic heads, pilot channel 11 of which connected to the output of the frequency divider 6, the second switch 12, the inputs and output of which are connected to the additional output and input of a block of 9 magnetic heads, serially connected frequency demodulator 13, block 14 of the allocation ktovoy frequency, second blo

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15, a third switch 16, a low-pass filter block 17 and an information signal selection block 18, the auxiliary input of which is connected to the summing input of the block 2 of the amplifiers-adders, and the outputs to the output buses 19, the block 20 of the cyclic frequency, the input connected to the information the input of the switch 16 and the output of the frequency demodulator 13, and the output with the second input of the control unit 1, the input of the frequency demodulator 12 is connected to the output of the unit 9 of magnetic heads.

The device works as follows.

When recording information, the input buses are fed to the inputs of the block 2 of adders-amplifiers, where they are summed up with the reference voltage Uc ,; (j 1, 2, ...., N) of the block of 3 reference voltages, which is necessary for the subsequent guaranteed selection of the clock frequency during reproduction in the absence of a useful signal on one or several input buses 1. The information thus converted is fed to N the inputs of the switch 4. At the same time, the (N + 1) input of the switch 4 is supplied from another output of the unit 3 of the reference voltage, the reference voltage} o, whose level is U (1 25-1.5), - This channel is used as a service write on the magnetic carrier pulse cyclic synchronization, the frequency of which

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Att. Simultaneously from the output of the generator 5, the signal is fed to the input of the frequency divider 6 and the input of the control unit 7. Frequency divider 5 generates a highly stable half-frame sync signal, which enters channel 11 of the pilot-recorder's recording signal 12. Control unit 7 generates control signals with frequency f and successive signals in block 2 of accumulator amplifiers, from which the analog information goes to the output travel tires 19.

Claims (1)

Invention Formula A multichannel recording device 10 and reproducing analog information containing a first switch, a clock frequency generator, a frequency modulator, a video recorder, a block of magnetic heads of which are connected by a control input and output to the output and input of the second switch, and the output to the frequency demodulator input, N Input and output tires, characterized in that. 15 (N + 1) inputs of the switch 4, connecting them to its output. Thus, at the output of switch 4, an amplitude-pulse modulated signal appears, in which there are information signals and a signal cycle frequency. Amplitude-pulse-20 in order to increase the fidelity of the reproduced modulated signal arrives, the first block is entered into it in the video path. Second control connected between the output the switch 12 provides a half-frame clock frequency generator and control switching of the magnetic heads to avoid overlapping of the recorded signal. In the playback mode, the recorded signal from the output of the frequency demodulator 13 simultaneously enters the inputs of the clock frequency sharing unit 14, the cycle frequency sharing unit 20 and the switch 16. The clock frequency sharing unit 14 drives and generates a pulse sequence with the frequency fr necessary for the unit 15 to operate management The cyclic frequency allocation unit 20 inserts a cyclic sync pulse, which puts the control unit 15 into the initial state, as in the event of a fault, or 40 laziness, a block of amplifiers-adders. and at the end of the survey cycle of all channels. The control unit 15 controls the operation of the Switch 16 and sequentially connects its input to the corresponding output. As a result, a signal appears at each of the N outputs of the switch 16, which then enters the low-pass filter block 17, where it is restored to the corresponding analog signal. In block 18, the information signals are subtracted by the reference voltage Vy, which was previously summed up from the information signal. Order 6849/54 Circulation 590 Random polygons pr-tie, Uzhgorod, st. Project, 4 th 14483644 mi signals in the block 2 amplifiers-adders, from the output of which the analog information is fed to the output bus 19. Invention Formula A multichannel analog recording and playback device containing the first switch, a clock generator, a frequency modulator, a video recorder, a block of magnetic heads of which are connected by a control input and output to the output and input of the second switch, and the output to the input of a frequency demodulator, N input and output tires, characterized in that. the main inputs of the first switch, 25 serially connected frequency divider and the channel of the VCR pilot signal, as well as serially connected clock frequency block, second control block, 30 third switch, low pass filter block and information signal block, outputs connected to output buses , the cyclic frequency block, whose input 35 is connected to the information input of the third switch, to the input of the clock frequency block and to the output of the frequency demodulator, and the output one - to the second input of the second block, controlled between the input buses and the information inputs of the first switch, the output of which is connected to the input through the frequency modulator 45 5 blocks of magnetic heads, and an additional information input - with the output of an input voltage block, another output connected to the summing input of an amplifier block50 of adders and an additional input of an information signal block, while the output of the clock frequency generator is connected to the input of a frequency divider. 55 Subscription