| 摘要 |
A converter for carrying out Hadamard conversion on periodic sampled signals, such conversion giving from a sequence of N input samples another sequence of N output samples connected to the input samples by a linear relationship which can be represented by a square matrix of dimension N having coefficients equal to +1 or -1. The converter includes a charge transfer device comprising a plurality of electrodes disposed in lines; an input circuit capable of forming from an input signal sequences of N input samples, of converting each sample into bundles of charges and of injecting these bundles at appropriate moments under appropriate electrodes on the charge transfer device; a circuit for controlling the transfer of charges from one electrode to the next and doing so at a first frequency; a differential charge reader comprising two charge measuring circuits and a two-input differential amplifier, one non-reversing and the other reversing, each connected to one of the said measuring circuits, and an output, certain of the electrodes referred to as reading electrodes being connected to one or other of the two measuring circuits, each reading electrode thus providing a positive or negative contribution to formation of the signal furnished by the reader; and a circuit for forming output samples at a second frequency, from the signal furnished by the differential reader. The disposition of the electrodes and control of the moments of injection and of charge transfer under these electrodes is such that at any time when an output sample is formed, the N bundles of charges corresponding to the N input samples are situated under reader electrodes of which the respective signs correspond to the signs of the coefficients of the linear relationship which must link the said output sample with the said N input samples.
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