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Audio recording advice
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kernel_panic
Übergod
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PostPosted: Fri Aug 13, 2010 9:49 pm    Post subject: Audio recording advice Reply with quote

I've got a lot of interviews recorded in tapes from my girlfriend's research work, and I have to convert it to digital media. I will use mp3 as a codec for maximum portability. Now, it don't want to lose perceived fidelity but I don't want to overshoot either: what sort of bit rate is adequate for mono tracks whose content is just voice?

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PopeJo
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PostPosted: Sat Aug 14, 2010 12:30 am    Post subject: Re: Audio recording advice Reply with quote

uhm, all I can say is: there are optimized codecs for voice compression.
the way I understand it, lame is optimized for complex sounds (pop music) while there are much better codecs for speech.

but thats about all I can say.

lame: 64-128 VBR mp3 is very audible and small in size. you can hear it is compressed, thou.

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Last edited by PopeJo on Sun Aug 15, 2010 9:11 am; edited 1 time in total
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JockeTF
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PostPosted: Sat Aug 14, 2010 3:58 pm    Post subject: Re: Audio recording advice Reply with quote

Or archive it using a lossless codec such as FLAC, you'll still get pretty small files if it's just voice. That way you can keep the original quality but still encode it to whatever format that suits your needs in the future. :)

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kernel_panic
Übergod
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PostPosted: Wed Aug 18, 2010 11:45 pm    Post subject: Re: Audio recording advice Reply with quote

I ended up with mp3, variable bit rate at 100-120 kb/s. That should be enough--at least, I don't notice the difference.

My impression is that the voice codecs are designed to meet the requirements of VoIP, such as very low latency, which are not neccessarily those for archiving purposes. On the other hand, I don't think speex and company are very portable unless you are a geek.

As for FLAC, it's overkilling for this. The compromise between compression/quality is not worth in this case. Besides, I don't think the compression ratio depends on the source, Jocke?

But thanks!

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