A QUANTISING HALF-TONE GENERATOR FOR FACSIMILE RECORDING

摘要

An electronic unit is described which enables the amplitude of a continuously varying analogue signal to be quantised into six pre-selected channels within the range 0 to (+) 10v. The boundaries of the channels are defined by six discriminators which are connected via logic circuits to control the conduction of six associated current generators. The currents produced by the generators are used to produce a half-tone record on the chart of a facsimile recorder. By pre-setting the generator currents to represent a given amplitude channel, a quantised facsimile of the analogue signal may be produced in the form of a half-tone recording.