Commit message (Collapse) | Author | Age | Files | Lines | |
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* | - Increase dynamic range of filter coefficients from 28bit to 30bit. | ariff | 2009-07-05 | 1 | -3/+110 |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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) | ||||
* | Slightly increase amount of bandwidth of resampling filter for | ariff | 2009-07-02 | 1 | -1/+1 |
| | | | | | | | | | | | | | | | feeder_rate_quality=3. This have the benefit of reducing aliasing artifacts due to alias masking. Spectrogram analysis: o Old preset (100:36:0.90) http://people.freebsd.org/~ariff/z_comparison/z_q3_old.png o New preset (100:36:0.92): http://people.freebsd.org/~ariff/z_comparison/z_q3_new.png Approved by: re (kib) | ||||
* | - Add a way to change filter oversampling factor through | ariff | 2009-06-15 | 1 | -14/+39 |
| | | | | | | | | | | | | | FEEDER_RATE_PRESET "OVERSAMPLING_FACTOR:X .. .." where X = log2(oversampling factor). - Lower down default filter oversampling factor from 128 (log2 = 7) to 32 (log2 = 5), saving worth of 80 Kb. The use of better polynomial interpolator will raise its conversion quality/accuracy to match (or slightly better) with previous settings. - Bump driver version. | ||||
* | Move all sound related scripts to its own 'sound' subdir. | ariff | 2009-06-10 | 4 | -0/+1397 |
Suggested by: jmallett |