This function average, , clearly lies in the range [0,1]. Since the periodic variation is the average of and therefore close to and , the moiré effect is distinctively demonstrated by the sinusoidal envelope "beat" function , whose periodic variation is half the difference of the periodic variations and (and evidently much lower in frequency).
This function average,  clearly lies in the range [0,1]. Since the periodic variation is the average of and therefore close to and , the moiré effect is distinctively demonstrated by the sinusoidal envelope "beat" function , whose periodic variation is half the difference of the periodic variations and (and evidently much lower in frequency).