Which vcr

May 28, Apr 5, We want to use LGTM. Dec 21, Run RSpec and Cucumber suites by default. Dec 7, Enable RSpec zero-monkey-patching-mode Mar 30, Breaking: Require ruby 2. Apr 12, View code. Help Wanted We're looking for more maintainers. About Record your test suite's HTTP interactions and replay them during future test runs for fast, deterministic, accurate tests. Releases 1 6. Sponsor this project opencollective. Packages 0 No packages published. Used by Contributors The tape might move past the head at a speed of 2 or 3 inches 5 - 8 cm per second.

A video signal contains perhaps times more information than a sound signal, so the same approach cannot work. The tape would have to be moving past the head at a rate of many feet per second.

To solve this problem, two recording heads are mounted on a rotating drum that is tilted with respect to the tape. If you have read the HowStuffWorks article How Television Works , then you know that a television image is divided into a series of horizontal scan lines, half of which are displayed every 60th of a second. Each pass of the VCR's rotating head reads or writes the data for one field Therefore, the data recorded on the tape looks like this:. In this figure, the light blue bands are individual fields laid down by the recording head of the rotating head drum.

Since the drum contains two heads on opposite sides of the drum degrees apart , the two heads alternate, each one reading or writing every other band. The yellow tracks represent the audio and control tracks. The control track is especially important:. The head is rotating at 1, revolutions per minute rpm , or 30 revolutions per second.

In SP mode, the tape is moving past the head at 1. That means that if the video information were being stored linearly, you would need a mile-long km-long tape to store a two-hour movie.

Obviously, the rotating head approach, also known as helical scanning , saves a lot of tape! The only problem this creates is that a VCR designer has to get the video tape to wrap around the rotating head in order to record or play back the tape. In addition, the device has to read the audio and control tracks from the tape, keep the tape moving at exactly the right speed and detect the end of the tape. Begin typing your search term above and press enter to search.

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