Project viability

[Andres]

Hi,

I would like to ask about the viability of a project. The requirements of the project are the followin:

* sample an audio signal with a bandwith of 2 KHZ (so the sample frequency must be at least 8 KHZ or higher if possible)
* play the audio signal acquired in real time to headphones and transmit it by uart to a bluetooth module
* record the signal to an audio file (preferable) or a csv file.

Can be used the TEENSY 3.2 and the TEENSY AUDIO BOARD for this project?
Could you sugest me similar projects as guide ?

Thanks in advanced,

Andrés.

 

[PaulStoffregen]

In Arduino, select Teensy from the Tools > Boards menu. You can install Teensyduino even if you don't yet have a Teensy. Arduino updates the Examples menu based on the selected board, so select Teensy 3.2 first.

Then open File > Examples > Audio > Recorder.

Hopefully that will give you most of what you need.

You might also add a low-pass filter before the queue object, to limit the signal to only 2 kHz bandwidth. Then you could throw away 3 of every 4 samples, to end up with a slower data rate which could be send over serial.

 

[Andres]

Hi Paul, thanks for your answer.

I would like to ask you: Why do you say "throw away 3 of every 4 samples" ? What is the highest speed achived by the uart of the teensy?

 

[PaulStoffregen]

You said you wanted a lower sample rate. The audio library gives 44.1 kHz sample rate. To get lower, you must first use a low pass filter (which the audio library provides), and then you can get access to the fast sample and simply discard the ones you don't want. Hopefully that makes sense?

 

[Donziboy2]

Hi Paul, thanks for your answer.

I would like to ask you: Why do you say "throw away 3 of every 4 samples" ? What is the highest speed achived by the uart of the teensy?

I cant really say what the continuous data rate is but I run a Teensy 3.2 Serial at 6Mhz for a project over 20 feet of Cat5 using RS485 transceivers.