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Machine translation
1. (WO1981001491) SUBSCRIBER TELEPHONE STATION
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1981/001491    International Application No.:    PCT/DE1979/000138
Publication Date: 28.05.1981 International Filing Date: 22.11.1979
IPC:
H04B 10/114 (2013.01), H04M 1/72 (2006.01), H04M 1/737 (2006.01)
Applicants:
Inventors:
Priority Data:
DE79/00138 22.11.1979 WO
Title (EN) SUBSCRIBER TELEPHONE STATION
(FR) STATION TELEPHONIQUE D"ABONNE
Abstract: front page image
(EN)The subscriber"s station comprises a base apparatus (1) and a wireless portable apparatus (2) between which a transmission is provided by means of short pulses PPM or PCM in the range of infrared radiation, optionally by means of a relay station (17) fixed to the ceiling. To this effect, there are provided transmitters (4, 7) and receivers (5, 8) of infrared pulses. For a PPM transmission there are provided BF/PPM and PPM/BF converters (18, 22; 19, 24) and for a PCM transmission there are provided a PCM-NRZ/PCM-RZ converter (34), a PCM-RZ/BF converter (37), a BF/PCM-RZ converter (35) and a PCM-RZ/PCM-NRZ (32) for which NRZ means "non-return to zero" and RZ means "return to zero". The use of a modulation mode with discreet values and short pulses only requires a low transmission power.
(FR)La station d"abonne comprend un appareil de base (1) et un appareil portatif sans fil (2) entre lesquels a lieu une transmission au moyen de breves impulsions PPM ou PCM dans le domaine du rayonnement infrarouge, eventuellement a l"aide d"une station relais (17) fixee au plafond. Pour cela sont prevus des emetteurs (4, 7) et des recepteurs (5, 8) d"impulsions infrarouges. Pour une transmission en PPM sont prevus des convertisseurs BF/PPM et PPM/BF (18, 22; 19, 24) et pour une transmission en PCM un convertisseur PCM-NRZ/PCM-RZ (34), et un convertisseur PCM-RZ/PCM-NRZ (32) pour lesquels signifie "non retour a zero" et RZ signifie "retour a zero". L"utilisation d"un mode de modulation a valeurs discretes et d"impulsions breves rend necessaire uniquement une faible puissance d"emission.
Designated States:
Publication Language: German (DE)
Filing Language: German (DE)