Abstract: An electric circuit, in particular for devices and systems operating on an SSMA basis, for the production of a number of different codes according to a linear law of formation and having practically negligible values of cross correlation coefficients and autocorrelation coefficients during a shifting time and characterized by the provision of two basic code generators respectively consisting of a sequential network, at least one-half adder and at least one delay network, the half adder representing the output circuit, wherein one of the two codes is respectively given at both outputs of the half adder and the delay network is arranged in the connection path which extends between one of the two basic code generators and the half adder.

Abstract: A method for detecting the coincidence between the phase position of a code of an SSMA signal which has been received with a heterodyne receiver and the code which is produced in the receiver through means for evaluating the signal power increase in an intermediate frequency position when the correct phase position occurs.

Abstract: A receiver for electric oscillations modulated in SSMA technique with which, in an intermediate frequency position, a multiplier is provided for multiplying the intermediate frequency signal with a code which is to be received, and with which a synchronous demodulator for obtaining the information to be received is connected to the multiplier, wherein the receiver includes in a section preceding the multiplier a gain control amplifier having two control voltage derivation circuits assigned thereto for deriving control signals, one of the voltage derivation circuits operable to evaluate the output signal of the multiplier and other of the voltage derivation circuits operable to evaluate the output of a synchronous demodulator so that in an unsynchronized state of the synchronous demodulator the control signal which is derived from the multiplier output serves to control the gain control amplifier and in the case of synchronous operation the control signal derived from the synchronous demodulator is employed to

Abstract: A method for synchronizing apparatus on the receiving side of a time multiplex or code multiplex transmisson system with apparatus on the transmitting side of the system, in particular in a system which operates in accordance with the SSMA technique, with which system the information is transmitted in a broad frequency band compared with the base band occupied by the information wherein a rapid frequency change modulated oscillation is transmitted by the transmitter at the beginning of transmission so that each frequency element is submitted to a digital phase modulation during transmission which is characteristic therefor in such a way that the frequency band which is occupied by this signal corresponds at least approximately to the frequency band which is occupied in a normal case of operation, whereby the carrier to be transmitted is phase shift keyed by a very rapidly clocked code with a long code period.