Zenas - technical q.
Why is it that some of the older talks are about 5mb in size, but lots of the more recent ones are getting on for 20mb or more? I remember when I ordered the early CMDs, the talks would be an hour long, but the file size would be fairly small. Now, CAD5 had one hour talks which are four times as big. Is it the sound quality?
When I started I was concerned with fitting as many talks as possible on a single cd as that reduced the cost of distribution - cd's in those days were more expensive and my cash flow was meager. The high compression rate was fine until the mp3 players started to sell like toasters and after doing a bit of research the format of 32khz 22kbit turned out to be the most compatible for these devices as a higher compression rate will not work in portable players. The rate was then lowered and has remained at the same ratio, although sometimes I forget to set it right and one or two files land up being unplayable on the small players.
I use a very special program that compresses audio efficiently, in fact it's the only program that produces precise compression. Audio Active Production Studio Pro (mp3pro.exe). All the other apps produce bigger filesizes for the same rates.
My process is to record the audio using Sound Forge 7, and save the file to a native Windows PCM Wav format. Then to compress it using AAP mentioned above.