A data board and data recording machine. The data board is insertable into the data recording machine. The data board has operator positionable stop means and the data recording machine has printing wheels connected to sensing rods; the sensing rods sense the position of the stop means and set the printing wheels in response thereto. A printing member plate and print receiving form are carried by the board and the information on the printing wheels and plate are printed on the form.

The present device includes a number of networks each having an analogue output corresponding to the weight of a digital signal applied to an input terminal thereof. The inputs are connected to respective outputs of a digital source, and the outputs of the networks are connected in series for applying an analogue version of the complete digital input signal to a receiving device.

A circuit arrangement for transmitting binary data elements `0` and `1` by frequency shift using two tone frequencies f0 and f1. The circuit arrangement comprises a modulator, an exclusive OR-gate and an integrator. A data signal DS produces from the modulator a digital signal DSS which by decoding of the integrator results in a tone signal TS comprising f0 or f1. The action of the OR-gate to which both signals DS and DSS are applied causes the amplitude of the tone signal TS to be substantially...

A data-transmission and data-processing system wherein a central station transmits, to decoders of data receiving stations, data comprised of address data and condition data which are adapted corresponding to the respective decoders for attaining desired accessing, and each of the decoders extracts the address data and the condition data from the data received thereby, compares the extracted address and condition data and an address of the decoder and outputs the condition data in response to a ...

Blocks of data, each representing ninety-six lines of a digital television signal are subjected to horizontal shuffling within each line and then to vertical shuffling within each block. The effect of the vertical shuffling is to displace sample words to different lines so that in the event of errors occurring during recording and reproduction in a video tape recorder, valid sample words are available adjacent to any error sample word for the purpose of error concealment. The vertical shuffling ...

A data separator for providing data and clock information derived from a floppy disk to a controller includes a synthetic oscillator phase-locked loop which adjusts the phase of the derived clock, thereby to tend to position data inputs within the central portion of their associated half-bit slots. The center frequency of the synthetic oscillator may be modified in accordance with prior phase adjustments to compensate for variations in the speed of the floppy disk drive.

A data reading apparatus for data transmission, for reading digital data from a digital signal series obtained by comparing the level of an incoming transmission signal obtained through a transmission path with a reference level at a detector, comprises a reference clock pulse generator for generating a reference clock pulse having a period equal to substantially 1/M of a transmission digit period of the digital signal series, a detecting circuit supplied with the digital signal series and the r...

A data link for an automatic aircraft carrier landing system is described which an aircraft is guided to the carrier by pitch and bank information from the carrier so as to indicate to the pilot of the aircraft whether he is within a prescribed flight path for landing or whether he should be waved off for another approach. The information transmitted from the carrier is received by a microelectronic data link receiver having an internal clock which is synchronized with the incoming information t...

The invention relates to a method in which the action of a data processing device can be initiated by entering information which has been recorded on a data carrier. In order to be able to prevent misuse of such data carriers, particularly in the case of the latter being lost, by third parties, the data processing facility can be set in such a way that the initiation by the data carrier is blocked. A data processing device (1) comprises a blocking circuit (14) by means of which the initiation by...

This invention relates to a method and apparatus for transmitting digital data between data terminals via a telecommunications exchange. Data is transmitted asynchronously between the terminals and the exchange and synchronously within the exchange. Transmitted data and internal exchange signals are differentiated even when they are identical. This is accomplished by using a data frame comprising both an information code and a control code which indicates whether the information code contains da...