Abstract: This device for transferring information between two digital signals includes means (26, 44; 62, 86) of selecting characteristics of a digital input signal, means (28, 46; 78, 94) of direct transmission to a digital output signal and means (28, 46; 80; 114) for the positioning within the latter, of elements of the input signal conveying first characteristics authorized, by the means of selection, to be transferred directly to the output signal, means (30, 32, 48, 50; 72, 74, 90, 92, 98) of measuring second characteristics of the input signal which are identified by the selection means, and means (78, 80, 102, 110) of modifying the output signal on the basis of the measurement values of the second characteristics so that the said second characteristics of the output signal and the input signal are identical.