Golden Earring wrote: > When dealing with the merits of PCM sampling rates much stress is placed > on the implied upper high frequency limit in accordance with "Nyquist > theory" (which was fully in place by the 1950's, long before its > subsequent application to digital audio - the Wikipaedia article on > "Nyquist-Shannon sampling theorem" is very informative, if not the > easiest of reads) & again I fully accept the frequency response upper > limit & the need for severe filtering at or below half the sampling rate > to prevent the intrusion of audible artifacts not present in the > original signal being introduced by the decoding process.
It's interesting to note that Nyquist's original paper, Certain Topics in Telegraph Transmission Theory (which Claude Shannon relied heavily upon while developing information theory in 1949), was first published in 1924, when "high fidelity" in audio depended largely on how well designed your recording and reproducing horns were. Nyquist worked for Bell Labs, and was trying to get the most Morse code down the smallest pipe, particularly important for the worldwide network of telegraph cables, which were first laid in 1850 and continued in operation until the 1960s. I recently acquired a copy of this 1928 Bell Labs reprint of the original 1924 paper, although I paid only $1.50 for my copy: https://www.atticusrarebooks.com/pages/books/746 Bill ------------------------------------------------------------------------ ftlight's Profile: http://forums.slimdevices.com/member.php?userid=5294 View this thread: http://forums.slimdevices.com/showthread.php?t=106914
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