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/*
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* ToneDetect1.ino Test the undecimated tone detector. |
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* |
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* Note that there is an alternative AudioAnalyzeCTCSS_F32 |
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* tone detector for frequencies below a few hundred Hz. This |
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* uses /16 decimation. |
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* |
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* This detector is suitable for DTMF or similar tones. |
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* |
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* Bob Larkin 26 March 2021 |
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* Rev 10 Mar 2022 to be compatible with CTCSS detector. |
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* |
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* Public Domain |
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*/ |
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#include "OpenAudio_ArduinoLibrary.h" |
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#include "AudioStream_F32.h" |
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// T3.x supported sample rates: 2000, 8000, 11025, 16000, 22050, 24000, 32000, 44100, 44117, 48000,
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// 88200, 88235 (44117*2), 95680, 96000, 176400, 176470, 192000
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// T4.x supports any sample rate the codec will handle.
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const float sample_rate_Hz = 44117.0f ; // 24000, 44117, or other frequencies listed above (untested)
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const int audio_block_samples = 128; // Others untested
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AudioSettings_F32 audio_settings(sample_rate_Hz, audio_block_samples); // Not used, all at default
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AudioSynthWaveformSine_F32 sine1; |
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AudioAnalyzeToneDetect_F32 toneDet1; |
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AudioOutputI2S_F32 audioOutI2S1; |
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AudioConnection_F32 patchCord3(sine1, toneDet1); |
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float freq; |
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void setup() { |
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Serial.begin(300); |
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delay(1000); |
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Serial.println("OpenAudio_ArduinoLibrary - TestTone Detector"); |
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AudioMemory_F32(20, audio_settings); |
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toneDet1.frequency(1209.0f, 24); |
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sine1.amplitude(1.0f); |
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// Plot the data from this loop to see the "sin(f)/f" response
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for(freq=1000.0f; freq<=1400.0f; freq += 2.0f) |
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measureDataPoint(); |
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} |
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void loop() { |
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} |
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void measureDataPoint(void) { |
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sine1.frequency(freq); |
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// The toneDet1 is continuous. But, if we change frequency, we need to
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// wait at least 20 cycles at the tone detector frequency
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// for the old measurements to flush through. At 200 Hz toneDet1
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// frequency, that would be 100 mSec. Thus, 120 msec should be enough.
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delay(120); |
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if( toneDet1.available() ) { |
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Serial.print(freq, 2); |
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Serial.print(","); |
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Serial.println(20.0f*log10f(toneDet1.read()), 6); |
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} |
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} |
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