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Just barely looking into Franks memory board, I would have to ask again, is it worth just upgrading to Teensy 3.6 with the audio adapter to handle the DSP I want it to? Frank, I tried changing the FFT to 256 and I still had distortion issues. I believe you have convinced me I have pushed the...

I am working on a project to measure the acoustics of a room by playing a test tone through a speaker and analyzing FFT from the input of a mic. I want to generate correction filters using the biquad filters. Well I designed a complicated circuit in the GUI that will help me run the analysis as...

Thank you I had seen it before but I had forgotten where it was and I couldn't find it again. These are the nasty details I was looking for. Thank you

I would like to know if there is documentation on the transfer functions used specifically for the band-pass and band-stop (notch) filters?

I am assuming when you say mix in a mic with a file playing on the SD card do you simply mean gain levels. In which case it is certainly possible. There are several example codes that individually handle these operations that you may use as a base. They may be merged with ease, just make sure...

Is there documentation on the transfer function for the bandpass and notch/band stop filters?

I will try it tomorrow! Thanks for the tip, I will update you.

Hi Ben, I decided to run each filter into another mixer and use the gain functions of the mixer. This is certainly not easy with a simple gain input of 1 to 1dB. I am curious is there documentation on the transfer function for the bandpass and notch/band stop filters?

Is there a structure as to how to add gain 1dB at a time. So far it has been a guessing game for me. Any positive gain I add cannot exceed a value of 2 even though the documentation states that any value between 1 and 32,767 is a positive gain and anything between 0 and 1 attenuates the signal...

That is fantastic news! What does that mean for the SD card on the shield? Now there will be two SD slots total...

Thank you Frank! This is exactly what I needed. I have successfully merged the example code ''spectrumAnalyzerBasic'' with Pete's fix to the ''tonesweep'' example code. On a separate note, I just purchased a Teensy 3.6 and I am curious if there will be an audio shield to come in the near...

Is it possible to add gain to the band pass or notch filters?

Is it possible to display all 512 sampled bins? I would just need to display it one time. Or is this part of the limitations you are speaking of?

I got it to work. I just had to create my own loop in order to have them both function. I like being able to use the tonesweep because it allows for user interaction to change variables as opposed to playing a tonesweep file from the SD. The accuracy of the acoustic measurement is no where near...

Yes Paul, most of this critical information (at least within pages 24-31) isn't new information as some of it is described in the audio tool. If I am doing my math correctly with FFT 1024 it is creating 512 bins (43Hz) apart measuring up to 22kHz but it only displays the first 30 bins (approx...

Where can I find these docs on the following example codes: FFT Part_3_02_Fourier_Transform do_more_while_playing tonesweep (Paul's fix if possible)

I am going to cover a spectrum of 10Hz to 22050Hz and a time interval of 30 seconds for the sweep. I think Paul is right about CPU usage. Would this method support the data I am trying to collect? If not would it be easier to run parallel teensies with shields to share data and run separate...

Hello World! I am trying to design a device that will measure the acoustics of a room. The concept behind it involves playing test tones such as pink noise and a logarithmic frequency sweep while simultaneously measuring the FFT of the tone played through a speaker. I have the teensy 3.2 audio...

Hey Pete it turned out to be a newbie mistake. I never opened the serial before, so as soon as I do now it plays over and over and everything is adjustable exactly how I want it. How ever my purpose is quite different and therefore I am still having problems. I am posting another forum about my...

I used Pete's tonesweep code as is, no modifications. On my hardware it didn't work. The only reason I mentioned the control lines is because when merging the fft1024 example code with ''do more while playing'' example code the control lines were interfering with eachother. Arduino IDE would...

Pete, I don't understand. I have the audio shield example breadboard sent by PJRC and I have tried several example tonesweeps and none of them play any noise. Other example codes play audio for me. The most recent tonesweep I tried was this one that you uploaded. I have my i2s output soldered...

Yes I have tried a different SD. I pretty much only use SanDisk for SD and thumb drives. Teenfor3, the problem is still the SD however the suggested audio example was supposed to read the SD and therefore testing if it is properly playing the audio files off of the SD, which is my ultimate goal...

It didn't work. I tried the wav file player and the blink while playing examples and both didn't play any audio. This is on a new micro SD with the same SDtest 1-4 files and the ones I want to use for my project. I am connecting a headphone into the headphone jack with . I took a scope to the...

Frank B I tried your suggested code but I'm still getting the same error: Initializing SD card......Initialization failed. Things to check: is a card inserted? is your wiring correct? did you change the ChipSelect pin to match you shiled or module? The last thing I haven't tried is swapping...

These answers are good but they aren't solving the original problem. I cannot communicate with the micro SD inserted into the audio shield which is placed on top of the teensy 3.2, just as shown in the picture of my original post. I am assuming, after watching the audio shield demo on youtube...

Paul, for a small business you are very on top of things and I thank you for such a timely response. But with the shield parallel with the Teensy 3.2 isn't that arbitrary. Should I not stack the shield and Teensy together? Earlier I gathered that the sck of an SD card reader (3rd party) should...

I am trying to play an audio file from a micro SD card while simultaneously record an audio signal to pin 14 a(0). I am having trouble communicating with the SD card. The board is selected on Teensy 3.2 which shows up on port 6 in my device manager. I select port 6 in the IDE and began with an...