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In Reply to: Re: Upsampling? Interpolation? posted by tunenut on September 28, 2005 at 12:24:58:
Tunenut,
You are correct, except that some upsamplers do extrapolate to frequencies beyond fs/2:From the Teac Esoteric website (RDOT):
When music data is recorded for CDs, the frequencies that exceed 20 kHz cannot be reproduced due to limitations of the CD standard sampling frequency. Music however, usually consists of frequency information that far exceeds 20 kHz. The effect of not being able to reproduce this additional information is that the listener cannot experience the most accurate and natural sound.
As the solution for recreating sounds above 20 kHz, we use RDOT; a technology that enables interpolation by analogy based on the fluency algorithm. This highly sophisticated RDOT technology uses analogy-based principles to generate all music information likely to occur between data samples. The information is generated from source signals of all sampling frequencies up to 192 kHz, not just the standard CD frequency. As a result, data that exceeds fs/2 is generated. This results in music with natural depth, and listeners can especially feel differences in resolution and reverberation when instrument sounds overlap. The extremely natural timbres and sound fields used to reproduce a live performance are clearly superior.
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Follow Ups
- Interpolation or extrapolation? Esoteric does... - Jim Pearce 12:41:56 09/29/05 (2)
- good info, thank you - tunenut 21:15:43 09/29/05 (1)
- Not only that, but.... - Jim Pearce 06:41:15 09/30/05 (0)
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