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49 lines
1.1 KiB
49 lines
1.1 KiB
#pragma once
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#ifndef DSY_TONE_H
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#define DSY_TONE_H
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#include <stdint.h>
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#ifdef __cplusplus
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namespace daisysp
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{
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/** A first-order recursive low-pass filter with variable frequency response.
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*/
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class Tone
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{
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public:
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Tone() {}
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~Tone() {}
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/** Initializes the Tone module.
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sample_rate - The sample rate of the audio engine being run.
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*/
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void Init(float sample_rate);
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/** Processes one sample through the filter and returns one sample.
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in - input signal
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*/
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float Process(float &in);
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/** Sets the cutoff frequency or half-way point of the filter.
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\param freq - frequency value in Hz. Range: Any positive value.
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*/
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inline void SetFreq(float &freq)
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{
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freq_ = freq;
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CalculateCoefficients();
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}
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/**
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\return the current value for the cutoff frequency or half-way point of the filter.
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*/
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inline float GetFreq() { return freq_; }
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private:
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void CalculateCoefficients();
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float out_, prevout_, in_, freq_, c1_, c2_, sample_rate_;
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};
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} // namespace daisysp
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#endif
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#endif
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