February 2016
Intermediate to advanced
216 pages
14h 38m
English
Content preview from Newnes Audio and Hi-Fi Engineer's Pocket Book, 3rd Edition
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270
Delay lines
Delay lines are used to delay an audio signal by a fixed
amount, and can be either digital or analogue
Digital delay The signal is first compressed to reduce the
dynamic range to one that can be quantised by a restricted
number of digital bits, and after pre-emphasising the treble it is
sampled at around 40 kHz. It is then converted to binary digital
words and passed along a memory store. At the other end the
binary data is applied to a digital/analogue converter, passed
through a low-pass filter to remove the quantisation steps, de-
emphasised, and the dynamic range expanded to that of the
original. The output from the memor ...
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