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Posted by Smarty on 01/12/06 02:40
Frank,
The 12 bit option does indeed disappear when the camera is switched from DV
to HDV, and a quick check of the owner's manual confirms your opinion. The
stereo channels are sampled at a 48 KHz rate so the stereo pair will
generate 96Kbytes/sec apiece, or 192 Kbytes/sec combined output from the ADC
before compression. Since the lossy compressor is achieving a 4 to 1
reduction, the compressed output is produced at 48Kbytes per second, which
is 384 kbits/sec, which Sony refers to as their "transfer rate".
Your description is indeed more accurate and more complete than mine, Frank.
Thank you.
Smarty
"Frank" <frank@nojunkmail.humanvalues.net> wrote in message
news:btdbs198fddia4jrsdjjhte1dahm6jti13@4ax.com...
> On Wed, 11 Jan 2006 16:51:55 -0500, in 'rec.video.production',
> in article <Re: HDV file, I cant edit it>,
> "Smarty" <nobody@nobody.com> wrote:
>
>>... HDV audio
>>is encoded at a sample size (12 or 16 bit) and at a sampling rate (384
>>Kb/sec)...
>
> Unless there's something new on the market of which I'm not aware, all
> HDV audio uses a sample size of 16 bits, never 12 bits. 12-bit is an
> option in DV, but not in HDV.
>
> Again, unless there's something new on the market of which I'm not
> aware, HDV audio sampling rate is always 48 kHz. 384 kbps refers to
> the total combined data rate of all channels (2 channels lossy
> compressed at a 4:1 ratio at a 192 kbps per channel data rate in
> normal HDV audio and optionally 4 channels lossy compressed at an 8:1
> ratio at a 96 kbps per channel data rate on the Canon XL H1).
>
> --
> Frank, Independent Consultant, New York, NY
> [Please remove 'nojunkmail.' from address to reply via e-mail.]
> Read Frank's thoughts on HDV at http://www.humanvalues.net/hdv/
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