Abstract: A system for recording a plurality of marking signals on a record carrier track during scanning thereof, and for detecting from the track during scanning thereof the marking signals recorded thereon. The system includes recording apparatus which generates the marking signals (M1, M2, M3) as different combinations of first and second recording signals (S1, S2) of different frequencies and of durations which are selected by respective time-control stages (Z1, Z2). The first marking signal (M1) may consist of only the first recording signal (S1) having a predetermined duration T; the second marking signal (M2) may consist of the combination of the first marking signal (S1) of duration T and the second marking (S2) of the same duration T; and the third marking signal (M3) may consist of the combination of the first recording signal (S1) of duration (P) and the second marking signals (S2) of a duration between T and zero such as T/2.

Abstract: A system (1) with electronic modules (6, 7, 8, 9, 15, 19, 20, 27, 28, 35, 44) exhibits at least one microprocessor (6) for controlling the operation of the system (1) and which monitors the correct operation and, when it detects an operational fault, periodically repetitively generates a control signal which is associated with the operational fault detected in each case and which controls a warning signal generator (47) which, in correspondence with the control signal, generates a warning signal which is reproduced as perceptible warning event the microprocessor (6) generates as control signals sequences (90) of binary-coded control pulse trains (91, 95) which consist of a number N of serially successive control pulse trains (91, 95) which are binary coded in accordance with the operational fault detected in each case, and the warning signal generator (47) generates, in correspondence with the sequences (90) of binary-coded control pulse trains (91, 95), sequences (97) of binary-coded warning signal trains (9

Abstract: The information signals recorded on a magnetic tape are accompanied by marks identifying particular items of such information, each mark (M.sub.1) comprising at least one marking signal (S.sub.1), the tape being driven by a tape-up reel hub (5) during recording. During playback a magnetic head (19) reproduces the recorded signals and a tachometer (46) coupled to the take-up reel hub (5) supplies a tacho-signal which is used by a microprocessor (42) as a reference for frequency comparison with the instantaneous frequency of the reproduced signals. When a predetermined relational condition exists between such frequencies the microprocessor (42) produces a signal indicating the presence of a mark (M.sub.1). Since the frequency of the tacho-signal and the frequency of the reproduced signals from the tape are affected in the same way by variations in speed of the take-up reel hub, such variations do not affect accurate detection of the recording marks.

Abstract: A recording apparatus for a drivable record carrier which can be moved past a scanning element of the apparatus comprises a marking device for making marks of different types on a marking carrier to identify specific passages on the record carrier. A marking element of the marking device is guided along a line and, to form the marks, it can be moved, starting from the line, by means of an actuating device in a first direction perpendicularly to said line and in a second direction opposite to said first direction. In order to obtain marks of a first type and a second type the marking element can form strokes on the marking carrier, which extend transversely of the line in the first direction or in the second direction only. Moreover, in order to obtain marks of at least one further type by means of the marking element, strokes can be formed on the marking carrier, which strokes extend transversely of the line both in the first direction and in the second direction.

Abstract: A recording and reproducing apparatus, equipped for connection of a remote control device through a multi-conductor cable, including an encoder in the remote device and decoder in the apparatus so that the number of control conductors in the cable is less than the number of switched control functions. To prevent inadvertent erasure, the recording function is the lowest priority input state to the encoder. In a dictation transcriber, the highest priority input is connected to the reference, so that the transcribing mode is enabled upon disconnection of the remote control microphone.