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"What The Specs Don’t Tell You… And Why"
SINAD is strictly the inverse of THD+N; just swap the numerator and denominator. SINAD is measured with a single tone just as with THD+N. TD+N is based on multitones and includes the harmonics of all the fundamentals and the IM products of each tone interacting with the others. If you limit the...- AP Jonathan
- Post #56
- Forum: Michael Lowe-A Discussion On Holistic Audio
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"What The Specs Don’t Tell You… And Why"
jkeny, thanks for finding that video. That was the presentation I was referring to in my earlier post. You will notice that the noise described is being measured using an AP analyzer that many people own. However, few people take the time to conduct this kind of test. This is frustrating to me...- AP Jonathan
- Post #48
- Forum: Michael Lowe-A Discussion On Holistic Audio
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"What The Specs Don’t Tell You… And Why"
The multi-tone used in the DIYA post consists of 32 steady state sine waves. It is a synchronous signal which means it repeats without discontinuity. That is what I meant by steady state. Perhaps we have a semantic difference here. When I think of noise in a multitone, I am not thinking of the...- AP Jonathan
- Post #43
- Forum: Michael Lowe-A Discussion On Holistic Audio
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"What The Specs Don’t Tell You… And Why"
Multitones are steady state signals so I wouldn't expect them to highlight noise floor modulation. However, I have not done any testing to look for noise floor modulation. One could change the relative phase of the tones and thus change the crest factor of a multitone without changing its...- AP Jonathan
- Post #41
- Forum: Michael Lowe-A Discussion On Holistic Audio
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"What The Specs Don’t Tell You… And Why"
Multitone means different things to different people. For some it includes all twin-tone tests such as SMPTE IMD. For others it is a term reserved for wide bandwidth tests using synchronous (non-windowed) FFTs and three or more tones. I fall into the latter camp but either way, I have not done...- AP Jonathan
- Post #40
- Forum: Michael Lowe-A Discussion On Holistic Audio
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"What The Specs Don’t Tell You… And Why"
Hi All, I just wanted to let people know that it looks like I will be able to give this talk again at THE Show Newport this June. The exact date and time has yet to be set. It is also possible I may be giving it twice. Details are still pending. Unfortunately, it seems that the room for talks...- AP Jonathan
- Post #37
- Forum: Michael Lowe-A Discussion On Holistic Audio
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"What The Specs Don’t Tell You… And Why"
Hi Michael, I appreciate that you have used the word "overrated" rather than "irrelevant". For experiments to be scientifically valid, they must be repeatable. Repeatability can be difficult to establish in the real world. We measure speakers in anechoic chambers and measure gear with sine waves...- AP Jonathan
- Post #24
- Forum: Michael Lowe-A Discussion On Holistic Audio
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"What The Specs Don’t Tell You… And Why"
Hi All, I hope you don't mind me reopening this thread but I just found it. I am the author of the RMAF talk and I am humbled by the amount of discussion this has generated. There are some very valid comments here. I apologize that my talk didn't offer any definitive conclusions. My goal for...- AP Jonathan
- Post #21
- Forum: Michael Lowe-A Discussion On Holistic Audio
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