I was asked about my vocoder projekt. Yes, it has been a long time since I wrote about it. And yes, I will publish the complete data for my vocoder project. Uhhhh… just looked up what I have published so far. It dates back to end 2014 with a lot off t.b.d statements. I finished the vocoder display module over a year ago. I need to update the site.

Vocoder Display Front

The vocoder synthesize part is tested and a first prototype with six channels is tested and running.

Vocoder Synthesizer VCA Testboard

BP for Vocoder Synthesizer

Testboards for Vocoder Synthesizer 3×2 Channels

I have the PCB’s for all 24 channels and the backplane laying around here. Needs to be stuffed and faceplate.

Final PCB for Vocoder Synthesizer

The vocoder input part is on stripboard and tested. Needs PCB and faceplate. The vocoder voiced unvoiced detection needs decision which way to go. Extra filters or using the available outputs from the vocoder analyzer and weighing the voltages. I think the later is the easier way to go in the moment.

Jürgen Haible’s vocoder PCB is available again. The guy who made it possible visited me some weeks ago and we had some talk about vocoder and other stuff. I wanted a more flexible account then Jürgen with his one big PCB. With my design you can start with eight channels and then go up to 16 and 24. And very important for me you can change filters. So you can use different characteristic for the filters and different frequency settings.