Band limiter for average section

[mzuther]

"Regardless of the sampling rate, meter version K-20/RMS is band-limited as per SMPTE RP 200, with a flat frequency response from 20-20 kHz +/- 0.1 dB, the average section uses an RMS detector, and 0 dB is 20 dB below full scale. To maintain pink noise calibration compatibility with SMPTE proposal RP 200, the meter's bandpass will be 22 kHz maximum regardless of sample rate." (Bob Katz on http://www.digido.com/level-practices-part-2-includes-the-k-system.html)

Seems like I'll have to shell out $50 to get RP 0200-2002 (http://store.smpte.org/ProductDetails.asp?ProductCode=RP+0200-2002).

[mzuther]

Very funny - how on earth can one get a "flat frequency response from 20-20 kHz +/- 0.1 dB" while at the same time band-limiting "as per SMPTE RP 200" (which corresponds to a "bandpass filter of 22 Hz to 22 kHz bandwidth")???

[mzuther]

Here's Bob's answer:

"Limiting the bandwidth---should be a sharp cutoff at the equivalent of the Nyquist frequency for 44.1 kHz. I think the cutoff should be done even if the meter is at 96 kHz."

I've already implemented this, so I'm closing this issue.