Pico Electronics Limited

Neil David Duffy

Henry Jamieson Riddoch

Leslie Alan Leach

An acoustic remote control link transmits different value bits as pulses containing different numbers of carrier cycles and identifies those bits on reception on the basis of the received pulses containing numbers of carrier cycles in one or other of two ranges. Each word transmitted is accompanied by a word of inverse digital value, the two words being compared on reception. A received pulse is deemed to have finished when a gap of given duration exists in the carrier.

Remote control systems

Gramophone equipment incorporating photoelectric scanning to detect bands between record tracks; an electronic counter to count the detected bands; a selector for making track selections; an electronic memory for storing selections; control circuitry for comparing the contents of the counter and memory to control a tone arm of the equipment to play selected tracks and lift from a record at the end of a selection; and a tone arm drive comprising means for lifting and lowering the arm and means for driving the arm laterally under control of the control circuitry.

Growing community of inventors

Glenrothes, United Kingdom

Neil David Duffy