Digital captures a numeric value for a sound wave at a specific moment in time. This is called a "sample." As soon as that moment is gone, though, the numeric value for that sample has no further use. You have to read a new sample for the next moment, and another sample for the next moment, and so on. Instead of being a complete record of the sound, samples are a series of dots along the sound wave. The number of samples each second is called the "sampling rate." A high sampling rate produces better quality sound, but it also produces a large file. "CD quality" uses stereo sampling (two separate audio values) at 44,100 samples per second. In rough figures, this will require 10 megabytes of disk storage for every minute of music. To low a sample frequency and the sound gets distorted like the old movie sample rate which had the wagon wheels going backwards due to the frames per second rate at which they were capturing the action. That sample rate was producing what is known as aliasing or an alias of what was truly happening.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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