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VCR
VCR

There are many types of video recorders, but the main components are the same, including the head system. Tape transport system, video signal processing system, servo system, mechanical control system, audio signal processing system, power supply. The head system includes a video recording and reproducing head, an audio recording and reproducing head, a control signal recording and reproducing head, a degaussing head, and the like.

1 Recording and reproducing head: The main function is to realize the transformation of electromagnetic signals during recording and playback. When recording, the recording wavelength is proportional to the speed of the tape, inversely proportional to the frequency λ = V / F recording wavelength λ (microns), V-band speed (m / s), f frequency (MHz) due to the high frequency of the video signal, To record, there must be a high tape speed by increasing the relative speed of the head to the tape by mounting the video head on a high-speed rotating drum. In a dual head helical scanning video recorder, the rotational speed of the drum is equal to the frame rate of the television signal, and it rotates one revolution, which is exactly the period of one frame of the signal. Audio head, recording and playback sound, control head, recording and playback control signal, silencer head, erase track. This system mainly completes the functions of the belt and the belt. The path and position of the different video recorders are different. The wearing state can be classified into a non-wearing type, a semi-wearing type, and a full wearing type.

2. Tape transport system Servo system means to use automatic control technology to control a certain mechanical quantity to keep it at a predetermined constant value or change according to a certain law. Carrier frequency

3. Video Signal Processing System This system mainly consists of a recording channel and a playback channel. In the recording channel, the color full television signal is decomposed into luminance and chrominance signals, and the luminance signal is low carrier frequency and shallow frequency modulation. High-band mode recorder 5-10MHZ Low-band mode recorder 4-5MHZ During playback, the chrominance signal is up-converted, the luminance signal is demodulated, and the two are mixed into a full-TV signal output.

4. Servo system

5. Mechanical control system It is composed of functional operation buttons, logic circuits and electromechanical action components.

6. Audio signal processing system

7. Power supply

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