Method for the transmission of several signals via a lightwave guide link, in particular between an exchange and a subscriber's connection

Abstract

Abstract 1. Process for the combined transmission of video signals and sound signals via a light waveguide link, in particular between a central unit and a subscriber terminal, wherein the video signal and sound signals which are to be transmitted are converted into pulse-position-modulated (PPM) signals which are transmitted having been combined to form a t.d.m. signal where a t.d.m signal which possesses a first frame structure is provided for the transmission from a central unit to a subscriber terminal, and a further t.d.m. signal which possesses a frame structure which differs from the first frame structure is provided for transmission from the subscriber terminal to the central unit, that moreover the t.d.m. signal which is transmitted to the subscriber includes a plurality of television signals each including sound (TV1, TV2, TV3, TV4) which may selectively comprise a video telephone signal, a number of mono-sound programme signals corresponding to half the number for stereo-sound signals and at least one digital telephone signal, and that the t.d.m. signal transmitted from the subscriber to the central unit contains a video telephone signal, a selection signal for television programmes, at least one digital telephone signal and optionally a subscriber signalling channel, characterized in that one single period of the PPM t.d.m signal transmitted to the subscriber terminal commences with a clock pulse (TP) which is recognisably wider than the other pulses, that thereafter in succession one pulse of one of the four television signals (TV1, TV2, TV3, TV4) including sound and then in 99 sub-periods in succession one pulse of one of the four television signals and one subsidiary channel are transmitted, and that in the first to sixteenth sub-period in the subsidiary channel the signals of the first to eight mono-sound signal are transmitted, in the seventeenth sub-period a signal of a digital telephone signal is transmitted, in the eighteenth to forty-ninth sub-periods the signals of the ninth to twenty-fourth mono-sound signals are transmitted, in the fiftieth sub-period a further signal of the digital telephone signal is transmitted, in the fifty to eighty-second periods the signals of the twenty-fifth to fortieth mono-sound signal are transmitted, in the eighty-third sub-period a third signal of the digital telephone signal is transmitted, and in the eighty-fourth to ninety-ninth sub-periods the signals of the firty-first to forty-eighth mono-sound signal are transmitted.

Inventors

• 👤 Hans-Martin Dipl.-Ing. Christiansen

Bibliographic Details