Sample rate affects the possible frequency spectrum an audio file can have.Variable bitrate will always provide better quality that constant bit rate CBR at the same given bitrate, since the encoder than concentrate more effort (data) on the hardest-to-encode parts. Higher bitrates will match the original content more closely, but potentially uselessly if the benefits are not clearly audible (overkill). Too low bitrates introduce garbled voice, strange artifacts and unnatural, smoothed out transients (short sounds like the letter T). Bit rate is how well the audio can be approximated by a given amount of data.subquestion: What does, in the windows media audio 10 professional codec, the format (A/V) designate? That might be two questions would a certain codec be desirable in certain sized rooms? So, my question is: Which Codec/Format combination would be most well suited to the philosophy of use of recording audio for notes, in a large or small lecture hall. One could take the try-it-and-see approach, but this question seems to well suited to superuser to pass up the opportunity to post. However, answering the question of precisely which format would be most well suited to this philosophy of use is another question that might require a different level of knowledge than most people would have. With a basic understanding of these terms, one could likely guess that 320kbps 48Khz CBR is overkill for this philosophy of use, and 0kbps 9 khz, mono CBR leaves something to be desired in quality, especially with 1tb hard drives around these days. Thrown in also are options for stereo, mono, and what's called "low delay CBR". They seem to be divided into two categories: (A/V) and non-A/V (whatever that means, I don't know), and then according to their kHz, and then from kbps. Especially in the case of the latter Codec, many formats are available, from, to CBR>. The options in the program for Codec are a) Windows media audio 9, b) windows media audio 9.2, and c) windows media audio 10 professional. It includes the function to record audio/video, or just audio. Microsoft's OneNote supplied with Office2010 does very well for note taking software.
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