diff --git a/fft.h b/fft.h
index 0250671..9f8c44c 100644
--- a/fft.h
+++ b/fft.h
@@ -33,39 +33,6 @@ static uint16_t reverse_bits(uint16_t x, int n) {
 	return result;
 }
 
-static const float sin_table[] = {
-	/*
-	 * float has about 7.2 digits of precision
-		for (uint8_t i = 0; i < FFT_SIZE - (FFT_SIZE / 4); i++) {
-			printf("% .8f,%c", sin(2 * M_PI * i / FFT_SIZE), i % 8 == 7 ? '\n' : ' ');
-		}
-	*/
-	 0.00000000,  0.02454123,  0.04906767,  0.07356456,  0.09801714,  0.12241068,  0.14673047,  0.17096189,
-	 0.19509032,  0.21910124,  0.24298018,  0.26671276,  0.29028468,  0.31368174,  0.33688985,  0.35989504,
-	 0.38268343,  0.40524131,  0.42755509,  0.44961133,  0.47139674,  0.49289819,  0.51410274,  0.53499762,
-	 0.55557023,  0.57580819,  0.59569930,  0.61523159,  0.63439328,  0.65317284,  0.67155895,  0.68954054,
-	 0.70710678,  0.72424708,  0.74095113,  0.75720885,  0.77301045,  0.78834643,  0.80320753,  0.81758481,
-	 0.83146961,  0.84485357,  0.85772861,  0.87008699,  0.88192126,  0.89322430,  0.90398929,  0.91420976,
-	 0.92387953,  0.93299280,  0.94154407,  0.94952818,  0.95694034,  0.96377607,  0.97003125,  0.97570213,
-	 0.98078528,  0.98527764,  0.98917651,  0.99247953,  0.99518473,  0.99729046,  0.99879546,  0.99969882,
-	 1.00000000,  0.99969882,  0.99879546,  0.99729046,  0.99518473,  0.99247953,  0.98917651,  0.98527764,
-	 0.98078528,  0.97570213,  0.97003125,  0.96377607,  0.95694034,  0.94952818,  0.94154407,  0.93299280,
-	 0.92387953,  0.91420976,  0.90398929,  0.89322430,  0.88192126,  0.87008699,  0.85772861,  0.84485357,
-	 0.83146961,  0.81758481,  0.80320753,  0.78834643,  0.77301045,  0.75720885,  0.74095113,  0.72424708,
-	 0.70710678,  0.68954054,  0.67155895,  0.65317284,  0.63439328,  0.61523159,  0.59569930,  0.57580819,
-	 0.55557023,  0.53499762,  0.51410274,  0.49289819,  0.47139674,  0.44961133,  0.42755509,  0.40524131,
-	 0.38268343,  0.35989504,  0.33688985,  0.31368174,  0.29028468,  0.26671276,  0.24298018,  0.21910124,
-	 0.19509032,  0.17096189,  0.14673047,  0.12241068,  0.09801714,  0.07356456,  0.04906767,  0.02454123,
-	 0.00000000, -0.02454123, -0.04906767, -0.07356456, -0.09801714, -0.12241068, -0.14673047, -0.17096189,
-	-0.19509032, -0.21910124, -0.24298018, -0.26671276, -0.29028468, -0.31368174, -0.33688985, -0.35989504,
-	-0.38268343, -0.40524131, -0.42755509, -0.44961133, -0.47139674, -0.49289819, -0.51410274, -0.53499762,
-	-0.55557023, -0.57580819, -0.59569930, -0.61523159, -0.63439328, -0.65317284, -0.67155895, -0.68954054,
-	-0.70710678, -0.72424708, -0.74095113, -0.75720885, -0.77301045, -0.78834643, -0.80320753, -0.81758481,
-	-0.83146961, -0.84485357, -0.85772861, -0.87008699, -0.88192126, -0.89322430, -0.90398929, -0.91420976,
-	-0.92387953, -0.93299280, -0.94154407, -0.94952818, -0.95694034, -0.96377607, -0.97003125, -0.97570213,
-	-0.98078528, -0.98527764, -0.98917651, -0.99247953, -0.99518473, -0.99729046, -0.99879546, -0.99969882,
-};
-
 /***
  * dir = forward: 0, inverse: 1
  * https://www.nayuki.io/res/free-small-fft-in-multiple-languages/fft.c
@@ -73,7 +40,6 @@ static const float sin_table[] = {
 static void fft256(float array[][2], const uint8_t dir) {
 	const uint16_t n = 256;
 	const uint8_t levels = 8; // log2(n)
-	const float* const cos_table = &sin_table[64];
 
 	const uint8_t real =   dir & 1;
 	const uint8_t imag = ~real & 1;
@@ -97,8 +63,8 @@ static void fft256(float array[][2], const uint8_t dir) {
 		for (uint16_t i = 0; i < n; i += size) {
 			for (uint16_t j = i, k = 0; j < i + halfsize; j++, k += tablestep) {
 				uint16_t l = j + halfsize;
-				float tpre =  array[l][real] * cos_table[k] + array[l][imag] * sin_table[k];
-				float tpim = -array[l][real] * sin_table[k] + array[l][imag] * cos_table[k] ;
+				float tpre =  array[l][real] * cos(2 * M_PI * k / 256) + array[l][imag] * sin(2 * M_PI * k / 256);
+				float tpim = -array[l][real] * sin(2 * M_PI * k / 256) + array[l][imag] * cos(2 * M_PI * k / 256);
 				array[l][real] = array[j][real] - tpre;
 				array[l][imag] = array[j][imag] - tpim;
 				array[j][real] += tpre;