35 lines
1.2 KiB
C
35 lines
1.2 KiB
C
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/*
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* Copyright (c) 2019 Andri Yngvason
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
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* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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#pragma once
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/*
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* This is an exponential smoothing filter with a time constant.
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*
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* The time constant must be set prior to applying the filter. It is, rougly
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* speaking, the response time of the filter.
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*
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* See: https://en.wikipedia.org/wiki/Exponential_smoothing
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*/
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struct smooth {
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double time_constant;
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double last_time;
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double last_result;
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};
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double smooth(struct smooth* self, double input);
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