Firmware-72 Function-003

FREQUENCY (3, 03h)

The frequency function measures either the frequency of successive peaks or the frequency calculated from the time between peak and end-peak events defined in the EDIT CONFIG command. The following methods can be selected using the FUNCTION command’s parameter values FP1:

FP1

0yyyyyyy:	yyyyyyy = [1..127]; Scale factor
	yyyyyyy = 1; Frequency is output as Hz
	yyyyyyy = 60; Frequency is output as BPM

The output range is divided by 1000 times the scale factor, so that if the scale factor is set to 1 and the frequency is output as pitch-bend messages, the frequency range is approx. 0 Hz – 16 KHz (Hertz). With the scale factor set to 60, and the frequency output as control-change messages, the frequency range is 0 – 127 BPM (beats per minute).

Example:

In order to output the frequency in BPM taps on a Touch sensor connected to input 1 of the USB-microDig as MIDI controller 64 messages, the following messages are sent (see also the EDIT CONFIG command):

240, 125, 0 {DEV}, 8 {FUNCTION}, 0 {yyy = 0}, 0 {FP2}, 3 {frequency function}, 60 {BPM}, 247 (F0h, 7Dh, 00h, 08h, 00h, 00h, 03h, 3Ch, F7h)

240, 125, 0 {DEV}, 106 {EDIT CONFIG}, 1 {configuration number}, 0 {input}, 48 {control-change message}, 64 {controller number}, 2 {peak detection}, 64 {threshold}, 127 {top}, 0 {noisegate}, 0 {time window}, 247 (F0h, 7Dh, 00h, 6Ah, 02h, 00h, 30h, 40h, 22h, 40h, 7Fh, 00h, 00h, F7h)

The threshold value may need adjustment to properly capture the signal peaks.