Abstract: A method for manufacturing blade channels of turbomachine rotors, in particular gas turbine rotors, with integrated blades. The method comprises producing a multiplicity of arrangements, offset with respect to one another in a circumferential direction, of bores proceeding from a radially outer shell surface of the rotor, at least two bores of at least one arrangement being offset with respect to one another in an axial and/or circumferential direction such that said bores engage into one another and form a slot; and producing pressure and suction sides of blades by material removal in the slots.

Abstract: Known burst signals exchanged between senders and receivers comprise either one syncronisation block followed by a data block or several equidistant synchronisation blocks separated by data blocks, with a synchronisation block including predefined synchronisation symbols and with a data block including data symbols. By adapting senders and receivers in such a way that said synchronisation blocks are located non-equidistantly, preferably with a centre of gravity of synchronisation symbols mainly corresponding with a centre of the burst signal, an improved synchronisation can be reached.

Abstract: Known burst signals exchanged between senders and receivers comprise either one syncronisation block followed by a data block or several equidistant synchronisation blocks separated by data blocks, with a synchronisation block including predefined synchronisation symbols and with a data block including data symbols. By adapting senders and receivers in such a way that said synchronisation blocks are being located non-equidistantly, preferably with a centre of gravity of synchronisation symbols mainly corresponding with a centre of said burst signal, an improved synchronisation can be reached.

Abstract: A method of generating a composite signal in the form of a QPSK signal on which an additional carrier signal is superposed, wherein a carrier signal is conducted through two series connected, switchable phase shifters. One of the phase shifters is controlled by one of two data signals. Both data signals are logically linked with one another by a logic circuit, and the resulting linkage signal used to control the other phase shifter. The phase states into which each phase shifter can be switched are selected and the linkage signal formed from the data signals such that, with the available values of the data signals, the carrier signal passing through the phase shifters is brought into the phase positions that should exist with the additional carrier signal superposed.

Abstract: A method of deriving the word timing or word boundaries of a PPM signal, without requiring a synchronizing marker to be added to the PPM signal, employs a bipolar evaluation signal which begins at any time slot of the PPM signal. The evaluation signal is multiplied repeatedly with successive portions of the PPM signal within a time frame of the PPM signal which extends over a plurality of word lengths, and the product signals are integrated. Such repeated multiplications with subsequent integration are performed a number of times, with the evaluation signal being offset by one time slot each time. The time position of the evaluation signal which, after repeated multiplication and integration, produces the smallest possible signal, is considered to be in phase synchronism with the word timing of the PPM signal.

Abstract: A method for producing antenna follow-up signals in which a sum signal and a difference signal are derived from a received beacon signal and an amplitude modulated signal is produced by superposition from these two signals. The amplitude modulated signal is converted into another frequency by means of a mixer which receives both the amplitude modulated signal and a mixing signal. The converted amplitude modulated signal is fed to an amplitude detector via a narrowband bandpass filter which permits only the signal frequency to pass. A voltage controlled oscillator is cyclically switched to produce a mixing signal which is fed to the mixer and which cyclically changes its frequency between two frequencies for the duration of each phase state of the difference signal. The converted signal at the output of the mixer changes its frequency between two further frequencies in response to the change of frequency of the mixing signal.

Abstract: A method and circuit for determining a unique word contained in received signals in a transmission system which operates with a multiple phase type of modulation at the transmitter and coherent demodulation at the receiver, the unique word being transmitted only as signals in two phases which are 180.degree. apart and the received signals being divided into orthogonal voltage components during demodulation, a single value whose algebraic sign is indicative of the unique word being derived by dividing the orthogonal components to form a quotient signal representative of the ratio therebetween, integrating the quotient signal over a plurality of clock pulse periods, multiplying the integrated quotient signal with one of the orthogonal components, and adding the resultant product signal to the other orthogonal component to form the single value.

Abstract: A method for detecting a predetermined code word contained in received signals in a transmission system which operates with a four-phase type of modulation at the transmitter and coherent demodulation at the receiver, the code word being transmitted only as signals in two phases which are 180.degree. apart and the received signals being divided into orthogonal voltage components during demodulation, which method includes selecting that one of the sum and difference of the voltage components which has the larger absolute magnitude value, and evaluating the received signal in accordance with the algebraic sign of that one of the sum and difference which is thus selected.