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<div style="font-family: arial,helvetica; font-size: 10pt; color: black;">-----Original Message-----<br>
From: xiphmont@xiph.org<br>
To: jazminstewart@usa.com<br>
Cc: vorbis-dev@xiph.org<br>
Sent: Sat, Feb 13, 2010 4:22 pm<br>
Subject: Re: [Vorbis-dev] Tuning Vorbis for Low Freq<br>
<br>
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<pre style="font-size: 9pt;"><tt>On Sat, Feb 13, 2010 at 5:14 AM, <<a __removedlink__1695899686__href="mailto:jazminstewart@usa.com">jazminstewart@usa.com</a>> wrote:<br>
><br>
> Hi, I've tried vorbis on a stream that has ~500Hz tops and it worked quite<br>
> good, but the raw data was converted to a fake 16bit 44Khz WAV<br>
<br>
'fake'?<br>
<br>
Vorbis will accept PCM data at failry low sampling rates. I think<br>
down to around 4kHz has been tested. Frequencies that aren't present<br>
won't be encoded and won't waste space.<br>
<br>
> Are there any chances I can take the code and tune it to work with nonPCM<br>
> data that has info from about 5 up to 500Hz?<br>
<br>
what do you mean by 'non PCM'? PCM data is an encoding requirement.<br>
<br>
Monty<br>
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<br>
Monty, it isn't "fake" the wav is real, but the input data is a signal in 32bit Floating Point values (each sample is a value itself not a PCM encoded value),<br>
I've scaled down to a signed 16bit. Imported as RAW with Audacity, saved as WAV, and then also saved as OGG.<br>
<br>
Then I've opened both the WAV and OGG and compared them. The ogg looks just like the WAV (visually).<br>
<br>
But I thought I might be able to tune it a bit to be more focused on low freqs.<br>
<br>
Thanks.<br>
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