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 TIME function has the following parameter values FP1 and FP2 that can be set with the FUNCTION command:

FP1

0yyyyyyy:	yyyyyyy = [1..65]; Scale factor
	yyyyyyy = 1; Frequency is output as Hz
	yyyyyyy = 60; Frequency is output as BPM

FP2

0m00yyyy:	yyyy: 0; No smoothing
	yyyy: [1..15]; Smoothing
	m = 0; Monitor off
	m = 1; Monitor on

When the monitor is enabled, the sensor value is output as a separate MIDI message after the smoothing function (if enabled) but before being processed as configured by the EDIT CONFIG command. The MIDI message is the same as set by the EDIT CONFIG command but, if note or controller messages are used, the note or controller number is incremented by one. If another MIDI message is used the MIDI channel is incremented by one.

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 0 Hz – 16383 Hz (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 that occur when tapping the Touch sensor.