This report describes a series of subjective tests made to discover whether instantaneous companding could profitably be applied to a pulse-code-modulation system designed for high quality sound ...

For technical and economic reasons, the present network of lines used for distributing sound signals to transmitters at audio frequencies will eventually have to be replaced by some telecommunication ...

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 ...