A method of reducing the effect of electromagnetic interference emissions produced by a control signal

摘要

The electromagnetic radiation attenuating method operates to reduce electromagnetic emission produced by a calculator push button in commanding a computer operation at a distance. The command code is Pulse Width Modulated. In order to effect the reduction either frequency, or phase, modulation is applied to the signal. A random offset modulation is applied for each cycle reducing the harmonic output produced by the coded modulation.