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In Reply to: Corrections to your corrections! posted by Christine Tham on September 15, 2005 at 13:55:25:
..Well, that is a moot point, since there will be embedded noise in PCM whenever delta sigma A/D is used. The only way you can avoid ultrasonic noise is by using ladder A/D (which has linearity issues) or by generating waveforms synthetically...Not quite...
Modern AD converters using 1 bit conversion can have higer internal sample rates and can have a flat noise floor for the entire usable PCM bandwidth.
Any rise in noise floor due to a noise shaper beyond the nyquist frequency is filtered out.
With DSD this rising noise floor is always found within the usable bandwidth.
With PCM the noise floor can be flat across the useable bandwidth.
(The latest BB ADC goes flat up to 50kHz. pdf page 10)
Frank
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Follow Ups
- AD converter issues.. - Frank.. 03:06:28 09/19/05 (0)
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