Tsunami.samplerateOffset doesn't seem to be working

Sensors Sound & Audio
1

The Tsunami.samplerateOffset method doesn’t seem to be working.

For example, here is some code that should play a track 16 on output 7 at different sample rate offsets. But I hear no differences in the sound.

tsunami.trackPlayPoly(16, 7, true);

tsunamiDelay(200);

for (int i = -30000; i < 30000; i += 500) {

Serial.println(i);

tsunami.trackStop(16);

tsunami.samplerateOffset(7, i);

tsunami.trackPlayPoly(16, 7, true);

tsunamiDelay(200);

}

tsunami.trackStop(16);

I tried it without stopping and restarting the track, and didn’t any changes in pitch either. Note that tsunamiDelay is a function that delays for a certain number of ms while calling tsunami.delay();

The documentation for tsunami.samplerateOffset isn’t very clear. Could someone provide any example of it being used to change the pitch/speed of a sound file?

Thanks,

Bill Pugh

2

The Tsunami Arduino library includes an example sketch that uses the sample rate offset command. Have you tried running that sketch or looking at the code?

3

After some testing, I determined that it works on Tsunami v1.09s, but not on the mono version, Tsunami v1.09m.

I was trying to do the pitch blending on channel 7 in the mono version, if that is significant.

I’m trying to use this board for a Burning Man art project; would be really nice I could find a way to make this work on the mono version quickly.

Bill

4

Found the bug. It was in the Tsunami-Arduino-Serial-Library code; for samplerateOffset, you were masking off all but the least two bits, which limited to outputs 0-3. I forked the code and will be submitting a pull request momentarily.