Nixdorf Computer Ag

Peter Scholich

Rolf Roeschlein

Waldemar Jaeger

Helmut Hoeink

Helmut Podtschaske

In the recording of information signals the signal elements of which are to have a prescribed length, a read/write head (WRT) is used in which the write gap (W1) is at a distance from the read gap (R) corresponding to the prescribed length. When a signal edge occurs at the read gap (R), an evaluation circuit (FIG. 4) controls the write gap (W1) in such a way that the latter records the next signal edge. For recording by the NRZ process, a further write gap (W2) can be provided between the write gap (W1) and the read gap R, which is controlled like the first and makes possible the recording of binary signals.

Method and apparatus for recording data

In the circuit arrangement according to the invention, the two transistors with their main current lines connected in series cause no disturbance of balance in the subscriber's line. By means of exclusively alternating current coupling on the subscriber's lines wire leads, extension elements which cause no galvanic voltage drop can also be connected on. The series connection of the main current lines of the transistors may be run directly to the input of the amplifier emitting the outgoing signals.

Four-wire conversion circuit for a telephone subscriber line

A device for the reading of identification cards and the like including a feed slot which directs the longitudinal edges of the card into spaced guide grooves which serve to straighten and properly align the card and into a conveyor which carries the card past a reading or checking device.

Growing community of inventors

Sande, Germany

Peter Scholich