0x s f
Detects the number of samples between zero crossings and calculates the frequency in axoloti format.
Inlets
frac32buffer.bipolar in
Outlets
int32.positive number of samples between zero crossings
frac32.positive frequency in axoloti format
frac32buffer.positive trig
Declaration
float count = 0;
float output = 0;
bool sign_old = 0;
bool sign = 0;
int32_t in_prev = 0;
Control Rate
outlet_smp = output;
outlet_f = 134217728.0f / output;
Audio Rate
count += 1.0f;
sign = inlet_in > 0 ? 1 : 0;
outlet_trig = 0;
float intercept = ((float)inlet_in) / ((float)(in_prev - inlet_in));
if (sign != sign_old) {
output = count + intercept;
count = -intercept;
outlet_trig = 1 << 27;
}
sign_old = sign;
in_prev = inlet_in;