Hi A real simple question that has puzzled me too long. In terms of a phase accumulator. a constant frequency out Fout , is a constant phase increment, New phase = old phase + phase constant For a linear up sweep of Fout new Phase = old phase + ( phase constant * N) where N is an integer, increases by 1 on each iteration So for a log sweep ? new phase = old phase + ( ??? ) so what do I put in for ???
I can't speak authoritatively within the context you've given, but "log sweep" generally means that the logarithm of the parameter changes linearly.
Thanks can i turn the question around ? If for instance I have a plot of a 'log sweep', how could I 'prove' that it is a log sweep ? how could I prove the parameters of the 'plot' ? like ( start freq , stop freq, sweep 'speed' ) for a sweep down, would it be like constant number of cycles per octive ? or decade or something ? My current best bet is to generate a plot algorithmically, then compare the points !
In the case of plotting the function, you prove it is 'logarithmic', if the plot is a straight line when plotted on a log graph. http://www.printablepaper.net/category/log