Patent ID: 9231522
Filing Date: 2016-01-05
CPC Classification: H03B,H04R

Claim Text:
1. A method of providing a test signal comprising one or more sub-band signals each composed of a number of sinusoidal signals, each sinusoidal signal having an individual frequency and phase wherein each frequency is associated with a frequency index and the corresponding phase is an exponential function of the frequency index, the method comprising: receiving a desired crest factor value for each sub-band signal; determining an exponent corresponding to the crest factor based on an a priori known relationship between crest factor and exponent; calculating a phase value for each sinusoidal signal using the exponential function and the previously determined exponent; superposing the sinusoidal signals associated with the sub-band signals to obtain the test signal having the desired crest factor(s) in each sub-band, whereby the phases of the individual signals are maintained; and outputting the test signal to an audio system.