Home 
The Primers Oversampling
The Primers Oversampling
|
Oversampling Oversampling Defined |
|
Many audio engineers feel that a higher sampling rate would
improve the sound, but at a great expense to the convenient size of
current discs (5 inches, and 3 inches) which can easily be used not
only in the home, but in automobiles, and portable units. By Nyquist's
theorem, it was felt that you only need two samples to decode the
maximum frequency in a waveform, and therefore, since the maximum
audible frequency is 20 kHz, the sampling rate could be around 40 kHz.
It ended up being 44.1 kHz, but now this number is considered too low.
DVD-A remedies this problem because it can hold much more data.
"Oversampling" is a process whereby the player reads two samples, and,
using DSP, additional values are subsequently "interpolated" in between
those two. Thus, if the CD player uses 8X oversampling, then the player
creates 7 additional values in between each of the actual single
samples on the disc (7 + 1 = 8, for 8X oversampling). Oversampling is
for the purpose of removing artifacts when the signal is passed through
an analog filter to the output. The DAC performance probably does
improve. However, there is controversy over this procedure.
Comments (0)
 Write comment
 |
