Tasks Accomplished:

Successfully set up the sampling from a single microphone using the DFSDM,  and debugged it! It works correctly for now (right now, we’ve set it at low frequency – 8 kHz – but this parameter can be adjusted as needed so this should not be an issue).

Used the CubeMonitor to get a visual representation of the audio signal – tested it to make sure that it’s picking up real sounds (originally, we were just looking at bytes in memory locations).

Deliverables This Week:

Investigate what sorts of noise are most prevalent in the audio (there’s a DSP library allowing us to do FFTs – use this to get a frequency profile so we have a clearer idea of what other filtering on top of the DFSDM we might need).

Get two mics working – specifically, make sure that we can correctly set up two mics to sample in one data line, managing the interleaving etc. properly as needed.

Once we’ve two mics working, run the data through the AcousticSL library and test that we can pick up on the direction! (No display module yet, but we can check that the right value is stored at relevant memory locations).

Tasks Accomplished:

• Completed final design document
• Installed STM Cube IDE and development environment
• Experimented with blinking a LED attached to a GPIO port
• Continued researching DFSDM interfacing of the PDM microphones using a source linked here

To-Do This Week:

• Receive input from 2-4 mics
• Configure osxAcousticSL in 2 mic setup and explore the implications of multiple library instantiations
• Experiment with DFSDM sinc filtering to see effectiveness against noise

Tasks Accomplished:

Design Doc was completed and submitted

Received parts, installed Cube IDE, toyed around with a basic program.

Figuring out how to corrrectly connect the mic to board and retrieve the audio samples using DFSDM, by reading these two resources: here, and here.

To-Do This Week:

• Successfully get input from two mics and pass it to the Acoustic SL library
• Preliminarily see how well GCC-Phat performs
• Tinker with DFSDM input filtering to improve performance as needed
• Address open issue from last week of head tilt (mathematically it didn’t seem to be a problem, and since we are getting the parts now, we can just check using the real set-up once we figure out the microphone sampling)

Tasks Accomplished:
– Worked/working on design presentation/docs
– Investigated DFSDM filter setup and integration

To-Do:
– Run a few DFSDM filter simulations and implement
– Implement TDOA (with Ram)

Tasks Accomplished:

Finished the design presentation

Working on the design documentation

Received most parts except MCU

Some preliminary testing of the optical set-up

 

To-Do:
Start building it and coding it up once everything’s here!

Tasks Accomplished:

Presented the team’s design

Worked on the design presentation/docs

 

To-Do:

Right now we’re waiting for the main part, the MCU, to arrive so we can start implementing our design. This is when the major work begins. Another to-do is to double-check that head tilt does not affect (preliminary math calculations suggest that this is the case, but maybe a simulation would be good, depending on the time vs reward tradeoff).