Abstract: An embodiment of a system for generating energy from a fluid flow includes energy-conversion means and sail means, switchable between an active condition for being carried away from the energy-conversion means by the fluid flow and a passive condition in which such carrying away is minimized. The system further includes coupling means for coupling the sail means with the energy-conversion means, which converts kinetic energy provided to the sail means by the fluid flow into said energy when the sail means are in the active condition recovery means for recovering the sail means in the passive condition and switching means for switching the sail means from the passive condition to the active condition and from the active condition to the passive condition upon the sail means reaching a first distance and a second distance, respectively, from the energy-conversion means, the second distance being greater than the first distance.

Abstract: An embodiment for generating energy from a fluid flow is proposed. A corresponding energy generation system includes energy conversion means, sail means switchable between an active condition for being carried away from the energy conversion means by the fluid flow and a passive condition for minimizing said carrying away, connection means for connecting the sail means to the energy conversion means, the energy conversion means generating said energy when the sail means in the active condition is carried away, return means for returning the sail means in the passive condition towards the energy conversion means, and switching means for switching the sail means to the passive condition and to the active condition in response to a maximum distance and to a minimum distance thereof, respectively, from the energy conversion means.

Abstract: A method for recording and playing back an audio and/or video signal and associated recording and playback apparatus, comprises: A) converting an audio and/or video signal into a first series of samples, achieved by sampling at a predetermined frequency and writing to a read/write memory (46), B) forming, by the later reading of the samples from memory at a frequency that is different from that of writing and is possibly variable, a recording on a magnetic strip (43) associated with a succession of timing marks (34) which identify recording blocks and a predetermined time T for playback of each block, C) obtaining, by reading the recording and the associated succession of timing marks, a second series of samples which are written to the memory in order, and a timing signal, D) applying the second series of samples read from the memory in an order correlated with that of writing, through a filter, to a transducer, the sampling frequency of the recording or reading of the samples from memory, which varies over