DETAILED DESCRIPTION I claim: 1.
Strip module extending in a longitudinal direction, in combination with a plurality of optic fibre emission shutter elements comprising: a housing extending in said longitudinal direction including means for mounting at least two rotatable shutter elements, said housing mounting, for each shutter element, an optic fibre, having an end, thereby defining a viewing direction, and a cone of light about said viewing direction, diverging in said viewing direction, said viewing direction for respective optic fibres being substantially parallel, said optic fibre ends being substantially aligned in said longitudinal direction, means, corresponding to each of said optic fibres, for mounting a rotary shutter element on a pivotal axis transverse to said viewing direction, means for selectively driving each said rotary shutter element between ON and OFF positions, said shutter, in the ON position, allowing the passage of light in said cone, and said shutter having a panel, movable therewith, positioned to be located between and substantially in alignment with said pivotal axis and said fibre end, in the OFF position, said panel being dimensioned to occlude said cone, in the viewing direction when said panel is in said OFF position.
2.
A strip module as claimed in claim 1 wherein said housing includes a pair of uprights corresponding to each shutter element, extending in the viewing direction, each shutter element being pivotably mounted on said uprights.
3.
A strip module as claimed in claim 1 wherein each said shutter includes opposed outwardly directed stub shafts, substantially coinciding with the shutter pivotal axis, wherein each of said mounting means includes a pair of mutually facing wells, adapted to rotatably receive said stub shafts, and wherein each said shutter is resiliently compressible in an axial direction, whereby each said shutter may be axially compressed and expanded to allow said stub shafts to be inserted in said wells.
4.
A strip module as claimed in claim 2 wherein each said shutter includes opposed outwardly directed stub shafts, substantially conciding with the shutter pivotal axis, wherein each pair of uprights is provided with mutually facing wells, adapted to rotatably receive said stub shafts, and wherein each said shutter is resiliently compressible in an axial direction, whereby each said shutter may be axially compressed and expanded to allow said stub shafts to be inserted in said wells
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Audio Signal Processing 
