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I couldn't agree more Paul :) If you have any suggestion regarding further tests please let me know. I'd be very happy to help. I understand the situation and I appreciate your help on this. If you need any info, please post here or do feel free to contact me with a PM. If I had to give a...

Sorry, it wasnt 'very clear in my post. I meant that I powered off the board for a couple of seconds and I switched on the power again afterwards. Good point. The HF drop was only on the right channel (i.e. the channel with the mixer). The left channel had the output connected directly to the...

I run further tests: == filters ================= I re-run the same tests of first post. I uploaded multiple times with a frequency response test after every upload. I also tested the frequency before and after a board reboot (power off/on). The result was always the same. I also tried with...

I entirely agree. The hypothesis of old code hanging around is pretty unlikely. Everything is possible but I'm pretty confident I uploaded the program before the test. I repeated the test to be sure. It's a good suggestion - thanks! I'll see if I can narrow it down to a set of simple cases...

If this were the case, it would be a little bit of a disaster for me. With the biquad filter unable to go below 400Hz and the Chamberlin cutting above 11kHz, I'd have to abandon the Teensy+audio idea. I planned to use it professionally for a couple of products but I can't do it without filters...

My knowledge of DSP processing is next to zero but it sounds a reasonable assumption.

It doesn't look like there is an overwhelming interest for this issue but just in case, I think I managed to find the exact cut off frequency of the attenuation. The -3dB point looks located a 11kHz. It is suspiciously close to 44.1Khz/4 but it might be just a coincidence.

Hi Paul, The tests were very straight forward. I connected: Audio card output (Edirol FA-101, output 3) to both channel of the line input of the audio board. Audio board line output to audio card input (input 2). The software that I used to measure the frequency response is HOLMImpulse. It is...

I'm sorry. Probably, I wasn’t very clear in what I wrote. I was referring to these two lines of code sgtl5000_1.audioPreProcessorEnable(); sgtl5000_1.audioPostProcessorEnable(); and these two sgtl5000_2.audioPreProcessorEnable(); sgtl5000_2.audioPostProcessorEnable(); As I said, I may be...

My guess is that you can't have audioPreProcessorEnable() and audioPostProcessorEnable() active at the same time for the same sgtl5000. As you call them in sequence, only the Post is active. I suggest you try the same code without the audioPostProcessorEnable()

It gets weirder and weirder. I tried with another project that doesn't involve filters: The resulting frequency response is this: In red the frequency response with i2s1 connected directly to i2s2. In green the frequency response of the project. Please note that the only thing that I...

I just started to explore the combination Teensy and Audio board and I'm stuck with a problem. This is the diagram of the processing with the source code. This is frequency response diagram that shows in red the frequency response of the Teensy Audio shield then output is connected directly...