MMA Project; Real Time Spectrograms; Mic-Input Jack Oscilloscope
I really hope to start posting/reading about projects.
The project I am working on right now is a microphone data-logger.
I recently discovered that a friend was interested in a spectrograph for studying Mandarin pronunciation.
I tried 3 leads:
- microcontrollers — this idea died after I discovered their internal memory was really limited (couldn’t do a good sampling for very long. I’m still looking for an embedded/portable solution.
- The Mic-Input Jack of the computer (would have simultaneously solved my high speed data-logger problem and this problem).
- Praat Speech Analyzer — a quick open-source solution to the problem. This can take such samples and fix the problem if you can install it.
While unable to find a suitable program to do real time spectrograms for sound input, I was able to find an analog for mac’s “say” command in linux: espeak. It is pretty good and used like this:
echo hello world | espeak
I think I will just need to learn more about the audio input card for computers (current and voltage limitations and sample rates), then I will just use it and “Audacity” for my datalogging (I think that many audio formats can actually record raw data).
After that, it is a simple step to record a voltage divider in real time. Afterwards I could pull some fancier circuits from Franco’s Op-Amp design text.