Attentate Echo >> ?

[finnwoodman]

Hi everyone,

in the echo example there is this line of code:

echo = echo >> 1; // attenuate echo

What does it mean? Does it attentuate the echo by bitshifting it?

If so, how can I decrease the echo in smaller steps?

Best, Max

[Michael]

Yes, it reduces the amplitude of the echo signal by half. Shifting to the right by one bit is division by 2. It’s the same as:

echo = echo / 2;

but faster.

You can try reducing by a smaller amount, but it will require expensive math operations. If the math takes too long, the code doesn’t have enough time to run.

Try dividing by 1.5:

echo = ((echo >> 1) + echo) >> 1;

This is the average of echo and echo/2, which is effectively echo/1.5. I’m not sure how many cycles this operation will take, so you might want to reduce your sample rate to give the loop more time.

[finnwoodman]

Thank you Michael. This works great for my needs. What does cycles in this context mean?

[Author]

Posts