Abstract: An intelligent interface to enable a personal computer or the like to be used as a telex transceiver.

Abstract: A method for controlling the sending of a response from a telematic reception terminal (teletex, G4 facsimile, and mixed mode) is provided. The receiver includes a PAMB counter whose count indicates the remaining number of page attribute management function blocks (PAMBs), each including predetermined various attribute data relating to each page, such as line density, coding mode, page size, page number and document number. When one of predetermined commands, such as a page boundary command or a document end command, has been received, the receiver checks to see whether or not the count of the PAMB counter is equal to or larger than a predetermined value. And if it has been found to be equal to or larger than the predetermined value, a response is sent to the transmitter. Thus, the transmitter is permitted to send the information of the following page.

Abstract: For the transmission of data between a terminal device, which preferably comprises a personal computer, and a remote subscriber via a transmission link, in particular a teleprinter line, a transmission unit is arranged between the terminal device and the transmission link. The printer of the terminal device is also connected to the transmission unit. In addition to a transmitting/receiving unit, the transmission unit contains a control unit which is provided with a transfer device in order that the printer, as an output unit, can be supplied even with the data emitted from the terminal device in a local operating mode or with data transmitted via the transmission link. The control unit can additionally contain storage units and code converters.

Abstract: An N-Key Rollover Type Keyboard sequentially scans the keys so as to transmit information correctly as to each key which is depressed without transmitting a garbled code which could result from simultaneous depression of two keys without the sequential scanning. The coded information from the keyboard is applied to a differential amplifier along with the noise signal from the keyboard so that only the coded signal is amplified, thus reducing the noise level quite markedly. The coded signal is fed to a shift register which is cycled once for each scanning of the keyboard so that a current scan can be compared with a past scan in a comparator or an AND gate with the result that there will be an output only for the first scan that detects a depressed key, i.e., the depression of the key will not cause continued signal transmission, but will cause such transmission once only. A strobe is generated only on the first scan.

Abstract: A circuit for converting a binary input signal into a telegraph signal has constant current sources which respectively include at least one transistor with a separate bias voltage source for each transistor. The base of at least one of the transistors is connected to an input signal source. Operating voltages of opposite polarities are connected to the constant current sources, which are in turn connected to a telegraph signal output. In order to minimize the power necessary to drive the circuit, the transistors in the constant current sources, together with the respective bias voltage sources, are respectively disposed only between an operating voltage terminal and the telegraph signal output.

Abstract: Electronic apparatus having transmission capability of data from memory to a transmission line, such as a telephone line, having print-out capability of the data being transmitted, and having a control function, in response to actuation of a special key, to permit selection of either transmission and print out, or transmission only, as desired.