👉 Scantest is a type of digital signal processing technique used in audio and video coding. It was developed by Prof. A. J. B. Ramanujan, who is considered to be one of the pioneers in the field of signal processing. In short, "scantest" refers to a method used in digital signal processing for reducing the noise or artifacts present in audio and video signals. This technique involves filtering out unwanted frequencies from the signal before it can be properly processed by a