RU22836U1 - VIDEO INFORMATION RECORDING AND PLAYBACK DEVICE - Google Patents

Abstract

A video information recording and reproducing device comprising a removable medium connected to a recording and reproducing unit, to the signal input of which a modulator output is connected, and to the signal output of which a demodulator input is connected, the modulator input is a video input of the device, the demodulator output is a video output of the device, characterized in that the modulator input is connected to the servo processor unit and the system controller, which is respectively connected to the control keyboard and the sensor node, node d sensors is connected to the recording and playback unit, the output of the control signals of the servo processor unit and the system controller is connected to the input of the control signals of the recording and playback unit, the first fault simulation unit is connected to the modulator, the second fault simulation unit is connected to the demodulator, and the third fault simulation unit is connected to the unit the servo processor and the system controller, the outputs of the characteristic signals of the modulator, demodulator, servo processor unit and a system controller, a control keyboard, a sensor unit and a power supply unit, as well as a modulator input and a demodulator output, an output of a characteristic signal protection unit, is connected to an external connection panel.

Description

RECORDING AND PLAYBACK VIDEO INFORMATION

The device for recording and playing back video information belongs to training simulators and is intended to study the principles of video equipment and teach how to find the most common malfunctions of VCRs with oblique-lowercase recording.

An analogue of such a device is a VHS video recorder (Video Home System), which contains: an image channel, an audio channel, a tape drive, a tape refueling system, an automatic speed control system for dyeing the tape, a system for automatically adjusting the speed of the video head disk, a system for automatically adjusting the tape tension, a number of magnetic heads (erasure, sound, control channel) and, sometimes, a system of auto tracking (Fridlyand I.V., Soshnikov V.G. Automatic control systems in video recorders. -M .: Radio and Communications, 1988. .41 -43 C).

The closest in technical essence the device selected as a prototype is a device for recording and reproducing video information RU 2125300 C1, 01/22/1999, consisting of a recording and playback unit on removable media, a modulator, a demodulator, a decoder, a loop detector of a reproduced image, a pulse shaper and three blocks of selection and storage.

A common disadvantage of the analogue and prototype is that they are not intended to solve learning problems, because cannot demonstrate the form of characteristic electrical signals, do not have the ability to simulate the most common faults, and do not allow students to develop troubleshooting troubleshooting skills.

The technical task of the proposed device is to ensure the visibility of the interaction of the main nodes and blocks of VHS VCRs, the ability to observe the shape of characteristic electrical signals, simulate the most common faults and protect the electronic circuits of the device from incorrect actions of the user.

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MPK7 011V5 / 00, G09B19 / 00, H04N9 / 00

The technical problem to be solved is in a device for recording and reproducing video information containing removable media connected to a recording and reproducing unit, to the signal input of which a modulator output is connected, and to the signal output of which a demodulator input is connected, the modulator input is a video input of a device, the demodulator output is a video output of a device, achieved by the fact that the following are introduced: a servo processor unit and a system controller, the input of which is connected to the modulator input, a servo processor unit and a system con the scooter is connected to the control keyboard and the sensor node, the sensor node is connected to the recording and reproducing node, the control signal output of the servo processor unit and the system controller is connected to the control signal input of the recording and reproducing node, the first fault simulation unit is connected to the modulator, and the second fault simulation unit - with a demodulator, and the third block of fault simulation - with the servo processor and system controller block, respectively, you are connected to the protection unit of characteristic signals ode characteristic modulator signals, demodulator, servo processor unit and a system controller, a control keyboard, assembly of sensors and power supply, as well as the modulator input and demodulator output, the output node protection characteristic signal connected to the panel external connections. At the same time, the unit of the servo processor and system controller (combining digital systems: control, automatic control of the tape speed and automatic control of the video head disk speed), the sensor unit and the control keyboard are designed to ensure the interaction of the main components and units of the device in various operating modes of the VCR (recording, play, fast play, rewind, pause, freeze frame, etc.). To observe the shape of electrical signals, such characteristic signals are displayed on the panel of external connections from all main units (modulator, demodulator, servo processor unit and system KOHipoJimepa, sensor unit, control keyboard, power supply unit) through the characteristic signal protection unit introduced to protect the electronic circuits of the device from wrong actions of the learner. To simulate the most frequently reported Bcipe faults, there are three fault simulation blocks. The power supply provides the necessary supply voltage for the device.

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In FIG. 1 shows a functional diagram of the device.

A device for recording and reproducing video information, FIG. 1, contains a removable medium 1 connected to the recording and playback 2, to the signal input of which the output of the modulator 3 is connected, and the signal output of which is connected to the input of the demodulator 4, the input of the modulator 3 is the video input of the device, the output of the demodulator 4 is the video output of the device, the input of the modulator 3 is connected also with the servo processor and system controller unit 5, which is respectively connected to the keyboard) of the control unit 6 and the sensor unit 7, the sensor unit 7 is connected to the recording and playback unit 2, signal output the control block of the servo processor unit and system controller 5 is connected to the input of the control signals of the recording and playback unit 2, the first fault simulation unit 8i is connected to the modulator, the second fault simulation block 82 is connected to the demodulator, and the third fault simulation block 8i is connected to the servo processor and system controller block , to the protection node of the characteristic signals 9 are connected respectively the outputs of the characteristic signals of the modulator 3, demodulator 4, the servo processor unit and the system controller 5, the control keyboard 6, the sensor node 7 and the power supply, not shown in figure 1, as well as the input of the modulator 3 and the output of the demodulator 4, the output of the protection node of the characteristic signals 9 is connected to the panel of external connections 10. All blocks and nodes used in the proposed technical solution can be made according to standard schemes published in the literature.

A device for recording and playing back video information is as follows. The control keyboard 6 through the system controller 5 sets one of the possible modes of operation of the device (recording, playback, fast playback, rewind, pause, stop-tap), etc.). The sensor node 7 provides the conversion of the mechanical and optical effects of the device (characterizing the state of the recording and reproducing node, the state of the removable medium, the state of the actuators of the system for automatically controlling the speed of the tape and automatically adjusting the speed of the video head disk) into electrical signals. When recording, the modulator 3 provides the conversion of the spectrum of the video signal (limitation on the spectrum of the luminance video signal, followed by frequency modulation with a low modulation index and transfer to low frequencies 3iOCiibin

area of the color-difference signal), then the converted signal is fed to the rotating video head block of the recording and playback unit 2, while the video frame synchronizing pulses synchronize the operation of digital systems of the servo processor unit and system controller 5 (providing automatic control of the tape speed and automatic control of the speed of the video head disk) so that the formation of an oblique line trace of the residual magnetization of the magnetic tape of the removable nose ator I (video) desired form. During playback, the residual magnetization of the magnetic tape of the removable medium 1 is converted by a block of rotating video heads of the recording and reproducing unit 2 into an electrical signal, which is then amplified and spectrum converted by the demodulator 4 (inverse conversion of the brightness and color difference signals with compensation for possible horizontal drops), while the digital block systems the servo processor and system controller 5 provide a combination of the trace of the recorded residual magnetization of the magnetic tape carrier 1 with the path of the video heads of the recording and playback unit 2, compensating for possible deviations of the speed of the tape, so that the time scale of the previously recorded signal is restored. Faster playback is similar to the playback mode, with the exception of changing the temporary masoggab of the previously recorded signal under the influence of control signals of the automatic speed control system of the tape drive of the servo processor unit and the system controller 5. In the still image mode, the magnetic tape of the removable medium 1 is stationary with the rotating video head unit of the recording and playback unit 2 when control of the servo processor unit and the system controller 5, which together with the demodulator 4 provides fragment of a still video image, the so-called freeze. In the pause and rewind modes, only mechanical movement of the magnetic tape in removable medium i is provided by the control signals of the servo processor unit and system controller 5. Typical input and output signals of the device, modulator 3, demodulator 4, servo processor and system controller 5, control keyboard 6, sensors 7 and a power supply, in FIG. 1 is not shown, they arrive at the protection node for characteristic signals 9, which protects the electronic circuits of the device from short circuits .- {- // З / с / И

Scientific research institutes and overvoltages in case of erroneous connections or connections to the panel of external connections 10 connected to the protection node of characteristic signals. To simulate the most common faults, three fault simulation blocks 8, changing, if necessary, the levels of characteristic signals and the performance of individual stages of the modulator 3, demodulator 4 and the servo processor unit and system controller 5, which is quite enough for training purposes. The power supply provides the necessary supply voltage for the device. Thus, the visibility of the interaction between the main halls and blocks of VHS video recorders is ensured, the ability to observe the shape of characteristic electrical signals and simulate the most common faults, as well as protect the electronic circuits of the device from incorrect student actions.

Claims (1)

A video information recording and reproducing device comprising a removable medium connected to a recording and reproducing unit, to the signal input of which a modulator output is connected, and to the signal output of which a demodulator input is connected, the modulator input is a video input of the device, the demodulator output is a video output of the device, characterized in that the modulator input is connected to the servo processor unit and the system controller, which is respectively connected to the control keyboard and the sensor node, node d sensors is connected to the recording and playback unit, the output of the control signals of the servo processor unit and the system controller is connected to the input of the control signals of the recording and playback unit, the first fault simulation unit is connected to the modulator, the second fault simulation unit is connected to the demodulator, and the third fault simulation unit is connected to the unit the servo processor and the system controller, the outputs of the characteristic signals of the modulator, demodulator, servo processor unit and the system controller, control keyboard, sensor and power supply unit, as well as the input of the modulator and the output of the demodulator, the output of the protection node of characteristic signals is connected to the panel of external connections.