August 2013
Intermediate to advanced
360 pages
7h 23m
English
Content preview from Digital Audio Technology, 4th EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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6 Codes for digital magnetic recording
The binary data representing an audio signal can be recorded on tape (or disc) in two ways: either directly, or after frequency modulation.
When frequency modulation is used, say, in helical-scan recorders, data can be modulated as they are, usually in a non-return-to-zero format (see below). If they are recorded directly, however, say, in stationary-head recorders and compact disc, they have to be transformed to some new code to obtain a recording signal which matches as well as possible the properties of the recording channel.
This code should have a format which allows the highest bit density permitted by the limiting characteristics of the recording channel (frequency response, dropout rate, etc.) to ...
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