| 摘要 |
1. A modulator for signals which bear binary information and are phase angle modulated with controlled phase, each signal S(t) supplied by the modulator being able to be represented exactly or approximately by the superposition of elementary pulses Fp(t) which are mutually time shifted according to the equation S(t) apprch= SIGMA n exp (j phi n ) Fp(t-nT), wherein T represents the transmission duration of a binary information element, n is a relative integer defining the nth binary element and phi n represents the phase of the signal corresponding to a binary element n, characterized in that the modulator comprises a filter unit (2 ; 8 ; 19, 20 ; 30, 31) adapted to a wave form which can be derived from the main function Fp(t), the input of the filter unit receiving pulses of a phase n any time a binary information element n is applied to the input of the modulator, the main function Fp(t) being defined in the time interval (O, (L+1)T) by the equation see diagramm : EP0120774,P15,F1 wherein L represents the number of successive binary information elements during which the phase variation associated to a binary information element n takes place, PSI (t) is a function defined in the interval (O, 2LT) depending on the variation of the phase phi (t) of the modulating signal and PHI is the absolute value of the total phase variation due to a given binary information element. |
