Abstract: A method and means for filtering and intensifying signal components of a desired predetermined period of repetition wherein a plurality of recording heads in tandem arrangement are provided, adjacent recording heads being equally spaced from each other. A magnetic tape is drawn past the recording heads at a constant velocity. The recurring signal component of desired period of repetition is delivered to the recording heads simultaneously and in such a way that the portion of the magnetic tape upon which each individual recording of the desired signal component is made by each recording head reaches the next recording head simultaneously with the next such signal component. As a result the amplitude of the desired signal component is increased on the magnetic tape and the amplitude of all other periods of repetition is relatively reduced. The summated signal can be reproduced by means of a playback head and an appropriate readout means.