Ariff Abdullah 96831ae59b - Increase dynamic range of filter coefficients from 28bit to 30bit. ... This cause dramatic effect in overall precision and conversion quality by pushing down most aliasing artifacts around -180 dB. Spectrogram analysis/comparison: http://people.freebsd.org/~ariff/z_comparison/z_28vs30/ - Guard against possible 64bit overflow during accumulation process by slightly normalize and saturate sample and coefficient multiplication, possible during extreme 32bit downsampling (eg. 380KHz -> 8KHz) with custom preset that require more than ~7000 taps filter (which is overkill). - Add knobs through FEEDER_RATE_PRESETS to set dynamic range of filter coefficients/accumulator and prefered polynomial interpolator: COEFFICIENT_BIT:X (where 1 <= X <= 30, default: 30) ACCUMULATOR_BIT:X (where 32 <= X <=64, default: 58) INTERPOLATOR:I (where I = ZOH, LINEAR, QUADRATIC, HERMITE, BSPLINE, OPT32X, OPT16X, OPT8X, OPT4X, OPT2X) Approved by: re (kib)		2009-07-05 18:15:06 +00:00
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emu10k1-mkalsa.sh
feeder_eq_mkfilter.awk
feeder_rate_mkfilter.awk	- Increase dynamic range of filter coefficients from 28bit to 30bit.	2009-07-05 18:15:06 +00:00
snd_fxdiv_gen.awk