HYBRID-PULSE CODING:an experimental quadrature modulation system for television transmission

摘要

A comparison of p. cm and hybrid p. cm. is given and experimental tests on a particular h.p.c.m. system are described. The limitations and difficulties of a system using h.p.c.m, both fundamental and instrumental, are discussed It is concluded that, while the efficiency offered by a h.p. c. m. transmission system can approach the theoretical limit, this demands a high order of instrumentation and the performance is sensitive to propagation effects such as multiple paths.