Showing papers on "Wireless published in 1983"

Cordless telephone having a remote control function

Abstract: A cordless telephone including a base unit and a remote unit that are in wireless communication. The remote unit has a number keyboard whereby code numbers can be entered into the system. A pulse detecting network picks up and identifies the code numbers placed in the remote unit and, in response thereto, controls a variety of electrically responsive devices. The remote control function is carried out without interrupting the voice communication feature of the phone or tying up the subscriber's lines thus providing the user with a degree of mobility not found in similar telephone related control devices.

Method and apparatus for transmission of telephone calls to a portable, wireless telephone set

Abstract: A method and an equipment for wireless transmission of telephone calls between a stationary unit (1) connected to a telephone set (3) at a short distance from the stationary unit provides that all pairs of units (1, 3) have access to a plurality of common duplex radio speech channels for transmission of calls, and to a common radio signalling channel for transmission of signals referring to connection and disconnection of the speech channels. The radio speech channels are assigned after adaptive channel scanning in that they are listened to before a call, and a channel selected which is idle with respect to calls. The selection of an idle channel takes place automatically with the use of radio receivers (12, 25), channel selectors (15, 28) and circuits (16, 29) incorporated in both units.

Mobile radio system with primary and secondary channels for wireless communication between and with mobile subscriber units

Abstract: The present invention relates to a mobile radio system with primary and secondary channels for wireless communication between and with mobile subscriber units, in which, for a primary radio network on which the mobile radio system is based, a plurality of radio stations are provided in a reciprocal physical arrangement in the manner of a cellular system, with radio cells overlapping one another, in which a frequency distribution plan exists for the radio stations which largely excludes co-channel interference in the respective radio cell, including an extended peripheral zone, and in which a respectively considered secondary channel radio area is used to provide secondary channel frequencies (f1, f2, f3) with reduced transmission power levels compared with the primary channel transmission power levels which are equal to the frequencies (F1, F2, F3) of primary channels of other primary channel cells of the primary radio network, where the secondary channel radio areas of the secondary radio network lie within the primary channel noise area of the primary channel cells under consideration.

Operating period monitoring of radio receivers

Abstract: The operating period of portable wireless radio receivers for speech transmission installations, in particular interpreter installations, is monitored by coordinating the operating period of the radio receivers with the known and modifiable radiation period of the RF carrier through the use of radio receivers with automatic, preferably delayed de-activation on non-reception of the RF carrier of the speech transmission installation. The monitoring is used for reliable identification of the time when the batteries or accumulators of the radio receivers need to be replaced or recharged. A radio receiver suitable for performing this monitoring is also disclosed.