Abstract: A frequency separating system is described utilising tuneable frequency shifting complex converters in which the centre frequency of the band extracted and the bandwidth extracted can be varied depending upon the parameters chosen by the user. A single output band may contain multiple target carrier signals for separation using fine-tuning shaping filters. The local oscillators provide a stream of coefficient values for multiplying the digital signal sample values to perform part of the frequency extraction operation. These local oscillators may be numerically controlled oscillators with the stream of generated co-efficient values being selected from different sets of such coefficient values depending upon the desired frequency extraction.

Abstract: A frequency separating system is described utilising tuneable frequency shifting complex converters in which the centre frequency of the band extracted and the bandwidth extracted can be varied depending upon the parameters chosen by the user. A single output band may contain multiple target carrier signals for separation using fine-tuning shaping filters. The local oscillators provide a stream of coefficient values for multiplying the digital signal sample values to perform part of the frequency extraction operation. These local oscillators may be numerically controlled oscillators with the stream of generated co-efficient values being selected from different sets of such coefficient values depending upon the desired frequency extraction.

Abstract: An apparatus for frequency content separating an input signal is disclosed. The apparatus comprises a plurality of frequency splitting stages, each stage including one or more up-converter and down-converter pairs. An up-converter and down-converter pair serves (i) to receive a complex input signal representing an input bandwidth and (ii) to output a first complex output signal representing an upper portion of the input bandwidth and a second complex output signal representing a lower portion of the input bandwidth. The upper portion and the lower portion being contiguous and together representing the input bandwidth portion.

Abstract: An apparatus for frequency content separating an input signal, said apparatus comprising a plurality of frequency splitting stages, each stage including one or more up-converter and down-converter pairs, an up-converter and down-converter pair serving to receive a complex input signal representing an input bandwidth and to output a first complex output signal representing an upper portion of said input bandwidth and a second complex output signal representing a lower portion of said input bandwidth, said first portion and said second portion being contiguous and together representing said input bandwidth portion.

Abstract: A motor or alternator comprises a number of permanent magnets (34, 36) arranged about the periphery of a rotor (30). The magnets (34, 36) are encompassed by stator coils (44) pressed over and supported on the stator housing (41) between fins (39). The magnets (34, 36) are arranged with their like poles facing each other while the stator coils (44) are arranged in a C-shape or a U-shape configuration about the permanent magnets allowing the magnets (34, 36) to rotate within the toroidal space defined by the stator coils (44). The rotor (30) is made of a non-magnetic material which may include an electrical conductor such as aluminum or a highly resistive material such as a plastics material. The number of stator coils (44) will depend on the phase excitation used (a 3-phase motor is described) with the commutation of the coils being supplied either mechanically or electronically.

Abstract: Radar signal processor utilizing a technique for detecting targets moving slowly and clutter. The technique comprises dividing the clutter spectrum into a large number of narrow bands and in each band measuring the power ratio between upper and lower side bands. When this ratio exceeds a fixed threshold, the target is declared and, if necessary, its velocity signature can be detailed.