Proceedings PaperAcousto-Optical Wideband Programmable Signal Filtering
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A novel wideband programmable filter using acousto-optical devices for both signal and filter function is described. The salieht features of this technique are the electronically programmable filter function, the wide bandwidth capability and the fine frequency resolution filter potential. The filter employes a traveling acousto-optic lens together with acousto-optical spatial modulators such that both the input signal, the lens system , and the filter travel at the same acoustic velocity. Programming of the filter function is achieved by modulating the acoustic signal delievered to one of the spatial modulators, which serves as the spatial filter. Thus, the temporal frequency filtering function is performed by the spatial frequency filter in conjunction with a traveling acoustic signal. The traveling acousto-optic lenses as well as filter enables the use of state of the art acousto-optic spatial modulators as filter element, providing fine frequency resolution and simple addressing. Resolution in the filter domain of a few thousand is easily obtainable. Simple demonstrative experiments have been conducted successfully.