Posts by cjwhitehouse

To be fair, your original question was "how do we measure distortion?", not, "how do we measure THD%?". All I did was attempt to point out that while THD% is not hard to measure, it is not particularly useful either. There is rather more...

If you have the right software and use a logarithmic sine sweep, you can make a continuous plot of THD% against frequency. WinMLS can do this among other software packages. It can also show the contributions of individual harmonics at...

Quote: Originally Posted by Ilkka Rissanen When it comes to ear sensitivity curves, the original F-M curves from 1933 are considered inaccurate at the moment. The later work done by Robinson and Dadson in 1956 were the source for ISO...

Quote: Originally Posted by Looneybomber But for each octave up, cone movement is decreased 16x while maintaining the same SPL (in a non-resonant system, ie port/PR) so as you play higher and higher freqs., IMD/dopler effect...

Quote: Originally Posted by LTD02 frequency response can be measured and correlated with perception. we know flat is preferred. Frequency response and phase changes represent linear distortion. As you say, flat is preferred but we...

Quote: Originally Posted by LTD02 While you may be right that the only way to know if to conduct the research myself, I find it hard (impossible?) to believe that nobody here can point me to research that would help answer the question....

Quote: Originally Posted by craigsub The 10% limit has been widely accepted in the industry, from guys like Keith Yates, Ed Mullen, AVTalk, and many manufacturers. We have done 100's of blind tests here over the years - and have...

It seems a shame when we can't even seem to be able to agree on the laws of physics. As far as I can see, Mark and Ilkka are entirely correct in their contributions to that thread.

Quote: Originally Posted by curt c Hi, The new SMS software is for the SMS only. The issues addressed are not in the DD software. BTW, the new SMS download (V2.1.3) should be available on the Velodyne website for download by the end of...

Quote: Originally Posted by btp Now back to our regularly scheduled program... is there any RTA type of software that does (accurately) calculate THD for you? Does said software cost an arm and a leg? I don't ask these things to be...