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Chip, Very interesting. Firstly, the short story is that I have essentially the same issue (see attached T36_Shield2_Silence_4096pt_180M_QbasedPThru). I have my analyzer set at 4096 points so I see a bit more detail, but you can see they are saying the same thing. I've set its parameters...

Chip, Do you have a spectragraph of the noise? It might help to determine the type/frequency of possible sources. R.

Chip, Just to be pedantic a little for clarity, I'm looking to measure the _additional_ latency of passing through the teensy. A wire connecting two devices directly will have a 'latency' (all serialisation) of 128/44100 x 1 in this case. Putting a Teensy in the path adds additional latency -...

I 'm not sure where to post this, but I'm very pleased with the results so far with testing FFT/IFFT processing using the 32-bit floating point versions of the arm_math Library and the Teensy 3.6 and its FPU. Previously, passing audio through pairs of the q15 based arm_math library FFT/IFFT...

Thanks Pete. It's not that the Line-in doesn't work at all, it just seems to be not connecting through to outputs when the connection is only made through the patchcord system as a continuous stream, without involving the sktech itself in the transfer. It feeds a queue object in a sketch just...

I am having an issue with the standard PassThroughStereo sketch using my new Teensy 3.6, Arduino 1.6.12 and Teensyduino 1.31-beta1 (and Audio Shield). No audio is passed through either to the headphones or Line-out. On the other hand a sketch I wrote a while back that passes through the same...

Brian, I have only use the arm_cfft q15 functions so far. They work as documented, but have some limitations based on the 16 bit integer depth they use. A point about the arm_math functions - not all all of the functions identified in the documentation I use...

Have you seen this thread? https://forum.pjrc.com/threads/34855-Distorted-audio-when-using-USB-input-on-Teensy-3-1?highlight=usb+audio+osx

Is this true for the arm_math library as well? I would like to use the arm_cfft_radix4_f32 function with the new teensies (when they arrive) to avoid the loss of resolutions and upscalings needed with the q15 version. Will the FPU kick in automatically with this as well? Thanks.

This sounds very promising for me Derek. I tried the 6-bit depth sound and it it just doesn't cut it for the quality of sound I want. Maybe the new Teensy 3.6 FPU can also help with speed? Single precision only I gather though. Please keep me in the loop with any code you make available.

Thank you very much for the code. It was such a relief to see the core elements done so efficiently and clearly! I've been getting so bogged down in the Audiostream and Library infrastructure that I was losing sight of the woods etc. Yes I see what you mean about loss of resolution. I had seen...

Thank you very much Derek. I have been working with the real and complex components of the FFT ouput (making mods to the fft1024.cpp code), but I hadn't thought of the Audiostream input overwriting the in-place buffer while I was trying to do the IFFT (and vice versa presumably). My needs are...

Hi All, I've been attempting to add a basic IFFT stage to the fft1024 library function to see how it sounds, but it it seems harder than I thought it would be. Tried a few different approaches, but the general idea is to try and do it in-place with the original fft1024 buffer result but adding...