How Does a VCR Work?
Basics of a VCR
A VCR (videocassette recorder) is a general electronic device used for home entertainment. It can record video and audio to a VHS videotape (like the one shown above) that can be viewed at any time. VCRs can also play pre-recorded VHS tapes. It can be programmed to record at specific times as well.
VCR Details
The VCR is adaptable. It records live broadcast TV signals, video from other sources or cable TV video. The tuner modifies automatically for whichever signal is broadcast. It can find and keep the signal frequencies of applicable stations, and some are able to set the correct time on the clock from time-of-day broadcasts. VCRs have inputs to allow external video recording. This could be from games or video recorders (camcorders). The inputs are normally RCA (yellow, red & white) or S-video. VCRs can be set to record automatically. This can be done for one time only or on a repeating basis.
Inside a VCR
The tape mechanism is a vital element of the VCR. It progresses the magnetic tape inside the VHS tape above a recording (or playback) head at a constant speed. This permits the transfer of the video signal from (or to) the tape. These signals are recorded on the tape in diagonal tracks. The rate of speed the tape moves through the head is fast to record (or play) all of the necessary details. The stored video signal is then sent to the television for viewing. VCRs with four heads are capable of recording (and playing) both two-hour (SP -- slow play) and six-hour (EP -- extended play) tape speeds. Some of the VCRs can erase the tapes prior to recording on them to allow better playback quality. This is known as a "flying erase head."
The Non-Digital VCR
VCRs do not convert video signals to a digital format. This lowers the picture superiority with each copy made and over the life of the cassette. CDs, DVDs and similar media transmit digital signals that are of higher quality. They are less likely to have tracking troubles, noises, snow and they also last longer.
VCRs Uses
VCRs are still generally employed in homes. They are less expensive than other electronic recording devices. You do not need to have any monthly subscriptions to use them, either. VCRs are commonly used for recording and playback despite all of the newer available options.
Tags: recording playback, They less, video signal
