Abstract: A method of communication in an environment having repetitive noise where the signal bit rate of the incoming signal is substantially an integer multiple of the half-wave frequency of the alternating current wave form, the method including the steps of: in a receiver, de-modulating an incoming signal containing signal bits by taking digital samples of the incoming signal so as to demodulate the incoming signal into separate x and y channels, the x and y channels approximating respectively, a co-sine and sine wave, summing consecutive groups of the samples from the x and y channels so as to determine corresponding x and y channel points, wherein each group of the consecutive groups contains substantially the same number of the samples, within the receiver, defining at least first and second demi-bits wherein each demi-bit of the first and second demi-bits is of the same length and wherein the first and second demi-bits together, or integer multiples of the first and second demi-bits together, are the same leng