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Originally Posted by avocollector
Anyone know of any systems like that?
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Philips Miller system. Used extensively by the BBC, amongst others, in the pre WWII era. Basically it consisted of a 'tape' of clear celluloid coated with a layer of black gelatine. A sort of blunt wedge cutter attached to a moving armature driven by the audio cut into the gelatine layer, the depth dependant on the audio. With a wedge shaped cutter the area of the cut is greater for greater depth - therefore the cutter produced a 'variable area' optical track which could be replayed with the conventional cinema optical pickups of the time. The system had the advantage that it required no prcessing (unlike conventional comopt) and, as with magnetic tape. the recording could be rewound and replayed straight away.