Abstract: A broadband nonlinear drive control network for linear amplifiers with several amplifier channels has a first branch (Z1) with an adjustable amplitude limiter (A) connected to a signal source (S) through an impedance inverter (B), whereby an increasing impedance is produced at the signal source (S) when the limiter is activated. A variable resistor (C) is connected to the signal source (S) in a second branch (Z2). The resistor (C) begins to conduct only above an adjustable high frequency signal voltage. The amplitudes at the limiter (A) and at the resistor are tuned to each other so that the load impedance at the signal source (S) remains constant. Linear branch signal combinations provide the drive control voltages for the individual channels (K2 . . . Kn). A portion of the power output of the branch (Z1) directly drives the amplifier channel (K1).

Abstract: The amplification efficiency is increased in a system for linear amplification of signals, especially in satellite transponders, by connecting at least three amplifier impedance inverter units in parallel to each other between an input signal control network and a common load. The reactive loading of the individual amplifiers is compensated by shunt susceptances at the output ports of the individual amplifiers.

Abstract: A system and method for digital transmission of pulses of a predetermined duration includes a transmitter (30) and a receiver (40). A data stream (a.sub.i) is transformed into a narrow band signal spectrum and following transmission is demodulated to a data stream (a.sub.i). In one form of the invention concept, a Delta function spectrum is converted into a quasi-rectangular transmitter spectrum by appropriate filters (26). In the receiver (40), a filter (28) is employed for data recovery. Data symbols which are received by the receiver (40) are decoupled by using periodic zeros of an autocorrelation function obtained at the receiver output filter. The shape factor of filters used in the overall system is selected to be preferably within the approximate range of 1.0-3.0. By selecting suitable slope responses of the aforementioned filters, the duration of the autocorrelation function and the resulting systems may be controlled for optimized results.

Abstract: For displaying graphic information, in particular for braille reading, the invention employs small magnetizable balls (38) which are very rapidly patterned on an indented or perforated support (20) so as to partly project therefrom underneath a foil (70) holding the balls against falling out, whereupon the support is moved to a reading plane. Preferably, a lower feeding station (40) distributes balls into all perforations (22) of the support; the balls not required for the desired display are then sucked off in an upper removal station (50) by electromagnets (52) set off in an array aligned with staggered apertures in an upper plate (62). Short-time actuation of selected electromagnets is coordinated with the support motion under electronic control which may provide for time-multiplexed interleaving. A preferred embodiment includes two drums (30, 32) with sprocket wheels (28) arranged to pull a web-like endless belt band (20) with its foil (70) across frame plate (14, 16) of the device (10).