Calibrating My Earphones with the Tympan

At its core, a hearing aid is a microphone, an amplifier, and an earphone.  Each element is critical to the quality of the sound produced by the device.  For the Tympan, it (currently) is simply the amplifier (ie, the electronics) -- you have to bring your own microphones and speakers.... [Read More]

Calibrating Microphones with Tympan

One goal of our open source hearing aid platform ("Tympan") is to get people to experiment with new sound processing algorithms but another goal of the Tympan is to enable people to experiment with different microphones and speakers.  So, with regards to microphones, we designed the Tympan electronics to have... [Read More]

Enclosing the Electronics

After designing and building our custom electronics for the Tympan, it was clear that we needed an enclosure to hold it all together.  Using zip ties (my usual go-to solution) just wasn't good enough.  I needed something more proper to wrap around and protect the electronics.  I was kinda nervous... [Read More]

Tympan Electronics and Its Self-Noise

After measuring the audio performance of the Teensy Audio Board (see my previous post), I felt that I needed something better.  If I wanted my open-source hearing aid ("Tympan") to sound good, I needed a quieter audio interface with a bigger dynamic range.  So, with help from friends and colleagues,... [Read More]

Teensy Audio Board Self-Noise

When working with audio, one typically wants as quiet a system as possible -- no one likes listening to hiss.  So, when I started working with the Teensy and the Teensy Audio Board, I applied a critical ear to the board's performance.  While the Teensy Audio Board was very fun,... [Read More]