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Originally Posted by Sven
What is needed for those PPCs that have audio in, some Toshibas, the Dell x50, maybe others
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The hx4700 also has mic in (and the 5450/5550).
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As for Audio in via CF card, that exists too. http://www.core-sound.com/HighResRecorderNews.html for $199. Why so high? because the CF interface doesn't have audio capability. What they had to do is cram a digitizer (encoder) into the CF card, create the digital file and then just transfer the file over the CF interface. With the development cost and limited market, the price is high.
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Still, I think a "plain" 16 bit/44 kHz (instead of 24 bit / 96 kHz) resolution/sampling frequency, which is excellent for everyday recording, is enough, and can be MUCH cheaper (24 bit / 96 kHz ADC's are by far more expensive than 16 bit/44 kHz ADC's).
Furthermore, the Core Sound card only has the output file format of PCM WAV - not even ADPCM or any compression. And, if it isn't able to work together with any PPC-based on-the-fly MP3 encoder, it's pretty useless for casual "I want to record my lecture/my family events in stereo" use.