The various methods for converting analogue signals into the form of pulse-code modulation and back again are reviewed. Reasons are given for preferring a particular method of conversion called ...

The terahertz quantum cascade laser on its mounting. Credit: University of Leeds Lasers that switch on and off billions of times per second are the backbone of optical communications networks, but ...

The feasibility has been investigated of applying PCM to the distribution of stereophonic programmes of the highest broadcast quality in time-division multiplex. By this means all the programmes ...