![]() With proper gain matching, I can null everything below 3kHz which means that compression is applied only for these two bands (as it should be duh). This provides about 10 dB of noise reduction increasing to a possible 15 dB at 15 kHz, according to articles written by Ray Dolby and published by the Audio Engineering Society (October 1967) and Audio (June/July 1968)"įrom what I see your Fresh Air includes only two bands: a high-pass from 3 kHz and another high-pass at 9 kHz. (The stacking of contributions from the two high-pass bands allows greater noise reduction in the upper frequencies.) The compander circuit has a threshold of −40 dB, with a ratio of 2:1 for a compression/expansion of 10 dB. "The input signal is split into frequency bands by four filters with 12 dB per octave slopes, with cutoff frequencies (3 dB down points) as follows: low-pass at 80 Hz band-pass from 80 Hz to 3 kHz a high-pass from 3 kHz and another high-pass at 9 kHz.
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