From 5266ee5585535e498e7571110467d71e46a0ed43 Mon Sep 17 00:00:00 2001 From: Reiner Herrmann Date: Sun, 13 Aug 2017 15:47:09 +0200 Subject: Don't lookup notes for low background frequencies --- tuner.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/tuner.c b/tuner.c index 9782eec..4b3d835 100644 --- a/tuner.c +++ b/tuner.c @@ -15,6 +15,7 @@ #define ACCURACY 1.0 // Hz #define NOISE_FLOOR 30 +#define MIN_FREQ 10.0 // Hz #define FFT_INDEX_TO_FREQ(i) ((float)i * SAMPLE_RATE / FFT_SIZE) @@ -217,7 +218,10 @@ static void find_note(double freq) { int note = 0, dir = 0; - if (freq <= note_table[1].freq) { + if (freq < MIN_FREQ) { + note = 0; + dir = 0; + } else if (freq <= note_table[1].freq) { note = 1; dir = -1; } else if (freq >= note_table[ARRAY_SIZE(note_table)-1].freq) { -- cgit v1.2.3