Nth order Allpass filter created using 2nd and 1st order Allpass filters Useful to correct phase on crossovers created using nth order Linkwitz-Riley filters.
1st order Allpass filter for introducting a 90 degrees phase shift at the center frequency.
2nd order Allpass filter for introducting a 180 degrees phase shift at the center frequency. This is necessary for summing more than 2 bands created from 2nd order Linkwitz-Riley filters.
MIT License Author(s): Ethan Reker
Based on equations from https://github.com/vinniefalco/DSPFilters
Copyright (c) 2009 by Vinnie Falco Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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