Abstract: A method and a device which make it possible, simultaneously and in a perfectly identical manner, to process n analog signals (E.sub.1, E.sub.2 . . . ) of short duration. The device comprises n processing channels (V.sub.1, V.sub.2, . . . ) each receiving an analog signal and each possessing in series, a processing circuit (11, 12; 21, 22; . . . ) for frequency transfer (F.sub.1, F.sub.2, . . . ), and a delay circuit .tau..sub.1, .tau..sub.2, . . . (13, 23, . . . ) respectively. A set of switches (C.sub.1, C.sub.2, . . . , C'.sub.1, C'.sub.2, . . . ) interconnect the inputs and outputs of the various elementary processing channels (V.sub.1, V.sub.2, . . . ) in order to pass each signal through all the n elementary channels (V.sub.1, V.sub.2, . . . ) successively and sequentially, for a processing cycle. This permits the fine analysis of the echo signals received from a target consisting of several bright points, by a pulse compression radar.

Abstract: A surface wave dispersive filter spectrum analyzer is provided comprising two identical assemblies having "M-C-M" structure (premultiplication, convolution and post-multiplication, respectively by a first, second and third linearly frequency modulated ramps), one analyzing the signal to be analyzed, the other a reference signal, the output signal being obtained after mixing the output signals of the first and second assemblies in a mixer.