On Thu, Sep 20, 2012 at 9:15 AM, wrote: > The other thing I had wondered about, is there any situation where a > lecture has more than one person with a microphone? > Yes, I have been in a couple of lectures with more than one. Thanks for the tip, I'll have to go see how they've arranged that and where the signal mixing occurs. In view of the previously stated point that lecturers adjust their own > microphone levels to ensure they can be heard, you will probably want to > pick up the audio at some point after where they adjust the level, as thi= s > is likely to give the best consistency in recorded audio level (although > you may also require some form of automatic level control to handle extra > loud periods when the lecturer may get exasperated or whatever). > Yup, I intend to stick the splitter right between the lecturer's "line-out" and the input to the room's speaker system. But the signal quality will be so good coming straight from the microphone, that I'll be able to easily do software auto-leveling. At the moment, I bring my own portable audio recorder to lectures to record my own lectures. And even sitting at the back, really far away from the lecturer, with a LOT of noise, the open source sound manipulation tools I use do an *excellent* job at cleaning up the sound. I do (bandpass) filtering, auto leveling, stereo to mono mixing, normalization to 0dB, and then export to ogg -q0 at 16kHz in that order using a script I made. I intend to just use that script with a couple of minor tweaks, and I expect to get nothing short of amazing sound quality when using this script with a signal straight out of the lecturer's microphone. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .