One of my university lecturers, John Rayner, worked on developing these back in the day. Managed to track down a paper he published on it which is quite intere

One of my university lecturers, John Rayner, worked on developing these back in the day. Managed to track down a paper he published on it which is quite interesting: https://ieeexplore.ieee.org/document/1291644 https://ieeexplore.ieee.org/document/1291644