This version (16 Jul 2022 04:41) was approved by John Joseph.
Table of Contents
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Pink Filter
Description
The classic use of this type of filter is to convert white noise, which is equal energy per hertz, to pink noise, which is equal energy per proportional or constant-percentage (e.g., logarithmic) band.
Such energy displays as flat on any log scale graph when bundled (integrated) appropriately.
The Pinking Filter takes any broadband input and outputs a signal with a 3dB drop per octave. The classic use of this filter is to convert white noise (equal energy per hertz) to pink noise (equal energy per constant percentage, e.g., log bundling, as with an octave or subdivision).
To the human ear, which has an approximately logarithmic frequency response, white noise is distinctly trebly, while pink noise sounds broad and smooth, more like a waterfall.
Targets Supported
| Name | ADSP-214xx | ADSP-215xx/SC5xx | ADAU145x/146x |
|---|---|---|---|
| —————————— | ——————-- | ——————————-- | —————————- |
| PinkFilter | S | B/S | S |
Pins
Input
| Name | Type | Description |
|---|---|---|
| ———————- | ————-- | ———————- |
| WhiteNoise | Audio | Input Channel 0 |
Output
| Name | Type | Description |
|---|---|---|
| ———————- | ————-- | ———————- |
| PinkNoise | Audio | Output Channel0 |
Configurable Parameters
| GUI Parameter Name | Default Value | Range | Function Description |
|---|---|---|---|
| —————————————- | ———————- | —————— | —————————————- |
| InGain | -10 | -50 to 0 | Gain added to the input signal |
| OutGain | 0 | -50 to 0 | Gain added to the output signal |
DSP Parameters
| Parameter Name | Description | ADSP-214xx/SC5xx/215xx | ADAU145x/146x |
|---|---|---|---|
| —————————————- | ——————————————————————————-- | —————————————- | —————————- |
| InGain | Gain added to the input signal | Float | FixPoint8d24 |
| OutGain | Gain added to the output signal | Float | FixPoint8d24 |
| FilterCoeff | Filter Coefficient | Float | FixPoint8d24 |
resources/tools-software/sigmastudiov2/modules/filters/pinkingfilter.txt · Last modified: 16 Jul 2022 04:41 by John Joseph