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Posted by Mark & Mary Ann Weiss on 06/26/07 19:19
> > It's worse than the PD150 hiss problem. In all other respects, the
> > V1U audio is acceptable. s/n is pretty good for a camera, but there's no
> > excuse to roll off the low end at 1222Hz. Look at these results,
carefully
> > measured under laboratory conditions:
> >
> > http://www.basspig.com/HVR-V1U_PCM_Audio(DV).htm
> >
> >
> > This response curve is what I'd expect to see from the high pass output
of a
> > two-way crossover network. No preamp in the world is this poor. There is
no
> > excuse for the camera not to be flat to 5Hz, like every other piece of
> > digital recording equipment I own. Even my $299 Zoom H4 is flat to 5Hz
and
> > sounds way better than the audio on this camera.
> >
>
> what mic were you using?
A pair of Neumann U87s.
> where was it placed relative to the sound source?
On a T-bar mounted to the hot shoe on the camera, with me holding the
camera, standing curbside as the parade passed by-I'd say at the closest
point, the band passed within 20' of me.
> and what the hell do you expect from a $4or5k camera?
Better audio than I get from a $2K camera with consumer 1/8" jacks--not
worse audio.
> i don't think there's a pro around who expects 'serious' sound from its
> on board audio, even when using, say a senn me66 or equiv. the frequency
> it does an adequate, if not exceptional job with is that centred on
> speech. recording anything serious would usually involve some off board
> equipment, dat recorder, whathaveyou.
No, but I expect at least mediocre sound. This wasn't even that level of
audio.
The camera's audio section is DIGITAL. Therefore, there is no technical
reason why the electrical response cannot be flat to DC. I'm not talking
about the high end response, which is limited by the sampling frequency and
quality of ADCs.
There are times when it's not practical to drag along a laptop DAW, external
mic pre, ADC, firewire, 12V storage battery and inverter. Sometimes one has
to be mobile.
> add to this the known quality difference between hdv and dv audio, and
> you have your answer i think.
Any quality differences between PCM and MPEG1 LII audio would be on the mid
to upper end of the frequency spectrum, as that's where the data reduction
occurs. It doesn't take many bits to convey DC, or to convey low cycle-rate
waveforms. The data density goes up with frequency, hence the highs are what
suffer with MPEG. If MPEG were the cause of loss of bass, then nobody would
be sharing music on MP3 files. Think about it. :-)
> but hey, bloody great pics it takes, no?
>
> leslie
I wouldn't say great pictures. More like "sometimes passable, under ideal
lighting conditions". In reality, the images suffer a lot of
visually-distracting artifacts, such as shimmering rectangles that change
shape from frame to frame in shots looking down on calm water, shimmering
effects when panning across a football field, banding on sunsets, etc. In
short, I compare the picture quality to saving a TIFF file as JPEG from
PhotoShop with the quality setting at "2". It appears that the available
color palette is limited, much like a GIF image color palette. Under optimal
lighting, and avoiding smooth surfaces that require gradients to have enough
color transitions to produce a smooth gradiant, it can look pretty darned
good. Indoors, without multi-thousand watt lighting systems, the camera goes
into gain up, noise increases tremendously, resolution goes way down and the
MPEG CODEC gets so stressed by encoding noise that the picture quality
breaks down rapidly. You can see what I'm talking about here:
http://www.basspig.com/hvrv1u_HDV_artifacts.htm
--
Take care,
Mark & Mary Ann Weiss
VIDEO PRODUCTION . FILM SCANNING . DVD MASTERING . AUDIO RESTORATION
Hear my Kurzweil Creations at: www.dv-clips.com/theater.htm
www.basspig.com The Bass Pig's Lair - 15,000 Watts of Driving Stereo!
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www.adventuresinanimemusic.com
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