As a next-generation optical archive storage device for 8K video, we have been researching and developing holographic memory. Recent studies have focused on multi-level code instead of binary code to ...

This report summarises that results of tests at three sites, using typical indoor aerials, to compare FM and AM systems for broadcasting. The main conclusions are as follows:- (1) The proposed BBC ...

There are two radio modulation schemes everyone should know. Amplitude modulation changes the amplitude — or ‘volume’, if you will — of a carrier frequency and turns all radio into channels owned and ...