Comment by formerly_proven

You mean like a signal added to combat / detect aliasing? I'm not sure how that would work. I know HP did something like this, but they did it by introducing a known jitter into the time base. I don't think it could work by merely adding a signal, you need to interact with the incoming signal in the time domain to do something about aliasing. I have no experience with these older CCD-based ones, but the later TDS'es from the 90s could do aliasing. The time base jitter thing was probably patented by HP.