November 2007
Intermediate to advanced
736 pages
46h 32m
English
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HEAD GAP AND WRITING SPEED
Although the octave range has necessarily been reduced using an FM carrier system the maximum frequency required to be recorded has greatly increased. Peak white occurs at 4.8 MHz, and the upper sideband signal— most extensive when sharply-defined detail is being recorded—extends towards 8 MHz. The head/tape transfer system must be capable of passing such frequencies and the magnetic surface of the tape capable of retaining them. The period of an 8 MHz signal is 125 μs and during this short time enough tape must traverse the video head gap to adequately imprint the entire cycle as a magnetic pattern in the tape coating. With a typical head gap of 0.5 microns (5 × 10–7m) the tape-to-head speed needs to be 5 m/s; this ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.