It is absolutely time for another blog post!

Last week, I failed to deliver a solid post discussing what has been going on: so here it is.

Duh Duh, MATLAB!

Last time I sat down with Adam & we had a quick chat about my plan.
We then sat down at a laptop with Matlab, and wrote down a program which;

• Generated a sine wave at 1kHz
• Transformed the sine wave using the FFT function, and graphed in the frequency domain 
• Imposed an amplitude limit on the signal
• Graphed the resulting signal in the frequency domain, displaying all extra harmonic content

This weeks plan is to finish the code that measures the % THD, and to test the code. 

Then I will make a 1s loop of the signal at 2.5,5,7.5,10 and 15% and do a quick listening test.
Following that I will run audio through the same system and the same %s and do another quick dirty listening test to see if I am on the right track.

But I have not been totally slacking.

I have spent a reasonable amount of time in the last week finishing off the proposal paperwork, which I will subsequently hand in later today. 

It turns out there is plenty of surrounding research that I have found, but little to nothing on the perception of loudness directly. That could just be my poor Google skills. There is plenty on quality and thresholds (which I suppose are technically loudness), but none on the exact change of perception.

I will be at the Reproduced Sound conference on Tuesday & Wednesday next week, listening to talks such as Leo Beranek's key notes on concert hall design. This may be the last opportunity for me to listen to him lecture. It is also the IOA 40th anniversary, and I may even get the chance to bump into Sam Wise which would be pleasant. 

Back to work following a frozen weekend in North Wales

Will report back sooner, rather than later!