The EEGsynth
To link the digital signal processing on a laptop or Raspberry Pi to the analog synthesizer, I have made two usb-to-cvgate converters. The first one I designed and implemented was a one-channel version that is able to output up to (approximately) 5 Volt. The second one is an improved version with four channels that can be […]
I completed the first Arduino based controller. It has a single control voltage and a single gate, both directly wired to a male 3.5mm connector. Using serial commands over the USB connection, it allows specifying the control voltage between 0 and 5V(*), and the binary gate value (TTL logic). *) although the design was meant […]
With my first post on the Arduino based CV/Gate controller I implemented a single control channel using a single DAC. Now, using four TI LF398 sample-and-hold ICs, I multiplexed the DAC output into four control channels. I updated the Arduino sketch and managed to control all four outputs independently. However, something that I overlooked is […]
I wrote some code that wraps the serial interface and the control commands of the Arduino CV/Gate into a MATLAB class. I used the following example code in MATLAB to benchmark the speed. a = cvgate(‘/dev/tty.usbserial-AH01DRO4’, 115200); a.voltage = 0; a.gate = 0; c = 0; t = tic; while true a.voltage = 5 * […]
The EEG signal processing, classification and the translation into a control signal is done on a computer. This means that the computer needs to be able to send control signals to the synthesizer. There are in general two options for interfacing with a synthesizer: Midi and CV/Gate. Midi is a digital protocol over a serial […]