"clics" when playing from SD card

[emmanuel63]

Hello,

I have made a simple samples player. The samples are stored on a Teensy3.5 built-in SD card. Samples are not longer than 2 or 3 seconds. They are mono, 44 khz, 16 bits.
I have 8 AudioPlaySdWav objects. Response is fast and there is no problem to play up to 8 samples at the same time. The problem is that there is a small artefacts when a sample is triggered. There is a short clic at the very beginning of the sample. I can't get rid of these noises.

I tried to add delays and envelopes with short attack. It doesn't work.
I tried to read from the audioshield SD card slot. Surprise : no more clics! But data access from this slot is much slower and I have polyphony problems.
I tried to play with audioInterrupts with no success.

Even with basic codes with noting fancy, I have theses clics.

Any Idea ?
Emmanuel

 

[emmanuel63]

I answer to myself.

If I use stereo wave files, there is no clics. Only when playing mono files. Strange...

 

[MarkT]

Clicks normally indicate the idle-mode output sample is not zero. But as you haven't followed the forum rule, who knows?

 

[emmanuel63]

OK Mark, you're right... No code, ho help. I apologize for this.
I have open a new thread, in the right place, with a "ready to use" sketch :
https://forum.pjrc.com/threads/65365-playing-samples-from-SD-card-strange-behavior

Emmanuel

 

[MarkT]

Not sure cross-posting is helping - this is an audio library related issue!