The Right Thing to Do (makes GEQ look awesome)
... found that stupid commit messages get more attention ;-) - use 22050 Hz for sampling, as it is a standard frequency. I think this is the best choise. - redesigned the GEQ channels (fftResult[]) for 22Khz, based on channels found on old HiFi equalizer equipment. 1Kzh is now at the center; Bass/Trebble channels are using 1/4 on left/right side respectively - similar to real equalizers. Looks nice :-) - adjusted effects that use FFT_MajorPeak so that the maximum frequency is supported.
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Frank
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b8db47e528
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bbc8049832
@ -47,11 +47,12 @@
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constexpr i2s_port_t I2S_PORT = I2S_NUM_0;
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constexpr int BLOCK_SIZE = 128;
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//constexpr int SAMPLE_RATE = 22050; // Base sample rate in Hz - 22Khz is a standard rate. Physical sample time -> 23ms
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constexpr int SAMPLE_RATE = 20480; // Base sample rate in Hz - 20Khz is experimental. Physical sample time -> 25ms
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constexpr int SAMPLE_RATE = 22050; // Base sample rate in Hz - 22Khz is a standard rate. Physical sample time -> 23ms
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//constexpr int SAMPLE_RATE = 20480; // Base sample rate in Hz - 20Khz is experimental. Physical sample time -> 25ms
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//constexpr int SAMPLE_RATE = 10240; // Base sample rate in Hz - standard. Physical sample time -> 50ms
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#define FFT_MIN_CYCLE 22 // minimum time before FFT task is repeated. Must be less than time needed to read 512 samples at SAMPLE_RATE -> not the same as I2S time!!
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//#define FFT_MIN_CYCLE 22 // minimum time before FFT task is repeated. Use with 20Khz sampling
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#define FFT_MIN_CYCLE 18 // minimum time before FFT task is repeated. Use with 22Khz sampling
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// globals
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static uint8_t inputLevel = 128; // UI slider value
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@ -65,7 +66,7 @@ static bool limiterOn = true; // bool: enable / disable dynamics
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static uint16_t attackTime = 80; // int: attack time in milliseconds. Default 0.08sec
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static uint16_t decayTime = 1400; // int: decay time in milliseconds. Default 1.40sec
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// user settable options for FFTResult scaling
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static uint8_t FFTScalingMode = 2; // 0 none; 1 optimized logarithmic; 2 optimized linear
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static uint8_t FFTScalingMode = 3; // 0 none; 1 optimized logarithmic; 2 optimized linear; 3 optimized sqare root
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//
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// AGC presets
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@ -121,7 +122,10 @@ static float vReal[samplesFFT] = {0.0f};
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static float vImag[samplesFFT] = {0.0f};
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static float fftBin[samplesFFT_2] = {0.0f};
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#define FFT_DOWNSCALE 0.65f // downscaling factor for FFT results - "Flat-Top" window
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// the following are observed values, supported by a bit of "educated guessing"
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//#define FFT_DOWNSCALE 0.65f // 20kHz - downscaling factor for FFT results - "Flat-Top" window @20Khz, old freq channels
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#define FFT_DOWNSCALE 0.46f // downscaling factor for FFT results - for "Flat-Top" window @22Khz, new freq channels
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#define LOG_256 5.54517744
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#ifdef UM_AUDIOREACTIVE_USE_NEW_FFT
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@ -269,7 +273,7 @@ void FFTcode(void * parameter)
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* Multiplier = 1.320367784
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*/
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if (sampleAvg > 1) { // noise gate open
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// Range
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#if 0 // Range
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fftCalc[ 0] = fftAddAvg(2,4); // 60 - 100
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fftCalc[ 1] = fftAddAvg(4,5); // 80 - 120
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fftCalc[ 2] = fftAddAvg(5,7); // 100 - 160
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@ -286,6 +290,26 @@ void FFTcode(void * parameter)
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fftCalc[13] = fftAddAvg(111,147); // 2220 - 2960
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fftCalc[14] = fftAddAvg(147,194); // 2940 - 3900
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fftCalc[15] = fftAddAvg(194,250); // 3880 - 5000 // avoid the last 5 bins, which are usually inaccurate
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#else
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// optimized for 22050 Hz by softhack007 bins frequency range
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fftCalc[ 0] = fftAddAvg(1,2); // 1 43 - 86 sub-bass
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fftCalc[ 1] = fftAddAvg(2,3); // 1 86 - 129 bass
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fftCalc[ 2] = fftAddAvg(3,5); // 2 129 - 216 bass
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fftCalc[ 3] = fftAddAvg(5,7); // 2 216 - 301 bass + midrange
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fftCalc[ 4] = fftAddAvg(7,10); // 3 301 - 430 midrange
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fftCalc[ 5] = fftAddAvg(10,13); // 3 430 - 560 midrange
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fftCalc[ 6] = fftAddAvg(13,19); // 5 560 - 818 midrange
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fftCalc[ 7] = fftAddAvg(19,26); // 7 818 - 1120 midrange -- 1Khz should always be the center !
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fftCalc[ 8] = fftAddAvg(26,33); // 7 1120 - 1421 midrange
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fftCalc[ 9] = fftAddAvg(33,44); // 9 1421 - 1895 midrange
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fftCalc[10] = fftAddAvg(44,56); // 12 1895 - 2412 midrange + high mid
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fftCalc[11] = fftAddAvg(56,70); // 14 2412 - 3015 high mid
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fftCalc[12] = fftAddAvg(70,86); // 16 3015 - 3704 high mid
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fftCalc[13] = fftAddAvg(86,104); // 18 3704 - 4479 high mid
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fftCalc[14] = fftAddAvg(104,165) * 0.88f; // 61 4479 - 7106 high mid + high -- with slight damping
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fftCalc[15] = fftAddAvg(165,215) * 0.70f; // 50 7106 - 9259 high -- with some damping
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// don't use the last bins from 216 to 255. They are usually contaminated by aliasing (aka noise)
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#endif
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} else { // noise gate closed
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for (int i=0; i < 16; i++) {
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@ -350,7 +374,7 @@ void FFTcode(void * parameter)
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if (currentResult > 1.0)
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currentResult = sqrtf(currentResult);
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else currentResult = 0.0; // special handling, because sqrt(0) = undefined
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currentResult *= 0.85f + (float(i)/5.0f); // extra up-scaling for high frequencies
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currentResult *= 0.85f + (float(i)/4.5f); // extra up-scaling for high frequencies
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currentResult = mapf(currentResult, 0.0, 16.0, 0.0, 255.0); // map [sqrt(1) ... sqrt(256)] to [0 ... 255]
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break;
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@ -872,7 +896,8 @@ class AudioReactive : public Usermod {
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my_magnitude = fmaxf(receivedPacket->FFT_Magnitude, 0.0f);
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FFT_Magnitude = my_magnitude;
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FFT_MajorPeak = fmaxf(receivedPacket->FFT_MajorPeak, 1.0f);
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FFT_MajorPeak = constrain(receivedPacket->FFT_MajorPeak, 1.0f, 11050.0f); // restrict value to range expected by effects
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//DEBUGSR_PRINTLN("Finished parsing UDP Sync Packet");
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haveFreshData = true;
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}
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@ -5938,7 +5938,7 @@ static const char _data_FX_MODE_2DDRIFTROSE[] PROGMEM = "Drift Rose@Fade,Blur;;;
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uint8_t *binNum = (uint8_t*)&SEGENV.aux1, *maxVol = (uint8_t*)(&SEGENV.aux1+1); // just in case assignment
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bool samplePeak = false;
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float FFT_MajorPeak = 0.0;
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float FFT_MajorPeak = 1.0;
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uint8_t *fftResult = nullptr;
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float *fftBin = nullptr;
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um_data_t *um_data;
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@ -5958,6 +5958,15 @@ static const char _data_FX_MODE_2DDRIFTROSE[] PROGMEM = "Drift Rose@Fade,Blur;;;
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}
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*/
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// a few constants needed for AudioReactive effects
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// for 22Khz sampling
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#define MAX_FREQUENCY 11025 // sample frequency / 2 (as per Nyquist criterion)
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#define MAX_FREQ_LOG10 4.04238f // log10(MAX_FREQUENCY)
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// for 20Khz sampling
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//#define MAX_FREQUENCY 10240 // sample frequency / 2 (as per Nyquist criterion)
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//#define MAX_FREQ_LOG10 4.0103f // log10(MAX_FREQUENCY)
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/////////////////////////////////
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// * Ripple Peak //
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@ -6724,12 +6733,12 @@ uint16_t mode_freqmap(void) { // Map FFT_MajorPeak to SEGLEN.
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SEGMENT.fade_out(SEGMENT.speed);
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// int locn = (log10f((float)FFT_MajorPeak) - 1.78f) * (float)SEGLEN/(3.71f-1.78f); // log10 frequency range is from 1.78 to 3.71. Let's scale to SEGLEN.
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int locn = (log10f((float)FFT_MajorPeak) - 1.78f) * (float)SEGLEN/(4.0102f-1.78f); // log10 frequency range is from 1.78 to 3.71. Let's scale to SEGLEN.
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int locn = (log10f((float)FFT_MajorPeak) - 1.78f) * (float)SEGLEN/(MAX_FREQ_LOG10 - 1.78f); // log10 frequency range is from 1.78 to 3.71. Let's scale to SEGLEN.
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if (locn < 1) locn = 0; // avoid underflow
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if (locn >=SEGLEN) locn = SEGLEN-1;
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//uint16_t pixCol = (log10f(FFT_MajorPeak) - 1.78f) * 255.0f/(3.71f-1.78f); // Scale log10 of frequency values to the 255 colour index.
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uint16_t pixCol = (log10f(FFT_MajorPeak) - 1.78f) * 255.0f/(4.0102f-1.78f); // Scale log10 of frequency values to the 255 colour index.
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uint16_t pixCol = (log10f(FFT_MajorPeak) - 1.78f) * 255.0f/(MAX_FREQ_LOG10 - 1.78f); // Scale log10 of frequency values to the 255 colour index.
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uint16_t bright = (int)my_magnitude;
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SEGMENT.setPixelColor(locn, color_blend(SEGCOLOR(1), SEGMENT.color_from_palette(SEGMENT.intensity+pixCol, false, PALETTE_SOLID_WRAP, 0), bright));
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@ -6769,7 +6778,7 @@ uint16_t mode_freqmatrix(void) { // Freqmatrix. By Andreas Plesch
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CRGB color = CRGB::Black;
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//if (FFT_MajorPeak > 5120) FFT_MajorPeak = 0;
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if (FFT_MajorPeak > 10240) FFT_MajorPeak = 0;
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if (FFT_MajorPeak > MAX_FREQUENCY) FFT_MajorPeak = 1;
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// MajorPeak holds the freq. value which is most abundant in the last sample.
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// With our sampling rate of 10240Hz we have a usable freq range from roughtly 80Hz to 10240/2 Hz
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// we will treat everything with less than 65Hz as 0
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@ -6777,8 +6786,8 @@ uint16_t mode_freqmatrix(void) { // Freqmatrix. By Andreas Plesch
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if (FFT_MajorPeak < 80) {
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color = CRGB::Black;
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} else {
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int upperLimit = 20 * SEGMENT.custom2;
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int lowerLimit = 2 * SEGMENT.custom1;
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int upperLimit = 80 + 42 * SEGMENT.custom2;
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int lowerLimit = 80 + 3 * SEGMENT.custom1;
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int i = lowerLimit!=upperLimit ? map(FFT_MajorPeak, lowerLimit, upperLimit, 0, 255) : FFT_MajorPeak;
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uint16_t b = 255 * intensity;
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if (b > 255) b = 255;
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@ -6818,7 +6827,7 @@ uint16_t mode_freqpixels(void) { // Freqpixel. By Andrew Tuline.
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for (int i=0; i < SEGMENT.intensity/32+1; i++) {
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uint16_t locn = random16(0,SEGLEN);
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//uint8_t pixCol = (log10f(FFT_MajorPeak) - 1.78) * 255.0/(3.71-1.78); // Scale log10 of frequency values to the 255 colour index.
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uint8_t pixCol = (log10f(FFT_MajorPeak) - 1.78f) * 255.0f/(4.0102f-1.78f); // Scale log10 of frequency values to the 255 colour index.
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uint8_t pixCol = (log10f(FFT_MajorPeak) - 1.78f) * 255.0f/(MAX_FREQ_LOG10 - 1.78f); // Scale log10 of frequency values to the 255 colour index.
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SEGMENT.setPixelColor(locn, color_blend(SEGCOLOR(1), SEGMENT.color_from_palette(SEGMENT.intensity+pixCol, false, PALETTE_SOLID_WRAP, 0), (int)my_magnitude));
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}
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@ -6869,7 +6878,7 @@ uint16_t mode_freqwave(void) { // Freqwave. By Andreas Pleschun
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CRGB color = 0;
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//if (FFT_MajorPeak > 5120) FFT_MajorPeak = 0.0f;
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if (FFT_MajorPeak > 10240) FFT_MajorPeak = 0.0f;
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if (FFT_MajorPeak > MAX_FREQUENCY) FFT_MajorPeak = 1.0f;
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// MajorPeak holds the freq. value which is most abundant in the last sample.
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// With our sampling rate of 10240Hz we have a usable freq range from roughtly 80Hz to 10240/2 Hz
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// we will treat everything with less than 65Hz as 0
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@ -6877,8 +6886,8 @@ uint16_t mode_freqwave(void) { // Freqwave. By Andreas Pleschun
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if (FFT_MajorPeak < 80) {
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color = CRGB::Black;
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} else {
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int upperLimit = 20 * SEGMENT.custom2;
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int lowerLimit = 2 * SEGMENT.custom1;
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int upperLimit = 80 + 42 * SEGMENT.custom2;
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int lowerLimit = 80 + 3 * SEGMENT.custom1;
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int i = lowerLimit!=upperLimit ? map(FFT_MajorPeak, lowerLimit, upperLimit, 0, 255) : FFT_MajorPeak;
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uint16_t b = 255.0 * intensity;
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if (b > 255) b=255;
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@ -6927,7 +6936,7 @@ uint16_t mode_gravfreq(void) { // Gravfreq. By Andrew Tuline.
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for (int i=0; i<tempsamp; i++) {
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//uint8_t index = (log10((int)FFT_MajorPeak) - (3.71-1.78)) * 255; //int? shouldn't it be floor() or similar
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uint8_t index = (log10f(FFT_MajorPeak) - (4.0102f-1.78f)) * 255; //int? shouldn't it be floor() or similar
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uint8_t index = (log10f(FFT_MajorPeak) - (MAX_FREQ_LOG10 - 1.78f)) * 255; //int? shouldn't it be floor() or similar
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SEGMENT.setPixelColor(i+SEGLEN/2, SEGMENT.color_from_palette(index, false, PALETTE_SOLID_WRAP, 0));
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SEGMENT.setPixelColor(SEGLEN/2-i-1, SEGMENT.color_from_palette(index, false, PALETTE_SOLID_WRAP, 0));
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