HVX chip size???

[Graeme Nattress]

1280×720 is the current “best guess”, but as no details have been revealed, it’s just a guess. All we were told at NAB is that Panasonic are optimizing for dynamic range, resolution and low noise, and that they’d give us the best on all three (or words to that effect.)

Graeme

– http://www.nattress.com – Film Effects for FCP

[Rodrigo Lizana]

1/3″ I believe is the chip size. How many pixels inside that chips…let

[Graeme Nattress]

Chips are analogue devices. They don’t have bits.

Graeme

– http://www.nattress.com – Film Effects for FCP

[Rodrigo Lizana]

I meant the quantization of the video signal. Never said nothing about the chip having bits.

Rodrigo Lizana
PIXINE
http://www.pixine.cl
rlizana@pixine.cl

[Graeme Nattress]

Sorry. Nobody knows what the A to D converter will be, or the DSP. However, DVCproHD is an 8bit format, if that helps.

Graeme

– http://www.nattress.com – Film Effects for FCP

[Rodrigo Lizana]

Sure DVCPRO HD is 8 bits but the Varicam has a 10 bits HD-SDI port and since the HVX is going to P2 and not to tape under HD and DVCPRO 50 it could be possible…But I think the same as you. 8 bits. 🙂

Rodrigo Lizana
PIXINE
http://www.pixine.cl
rlizana@pixine.cl

[Jan Crittenden livingston]

Our current techology is 14 Bit DSP.

Jan Crittenden Livingston
Product Manager, DVCPRO, DVCPRO50, AG-DVX100
Panasonic Broadcast & TV Systems

[Graeme Nattress]

Thanks Jan – that’s good to know. A good DSP makes all the difference!

Graeme

– http://www.nattress.com – Film Effects for FCP

[Luis Caffesse]

[Jan Crittenden Livingston] “Our current techology is 14 Bit DSP.”

Thanks for the reponse Jan.

Graeme, or someone else who would understands this technical minutia better than I do, could you give us a clear explanation of why a higher bit DSP is better for the final signal (considering DVCPro is an 8bit format)?

And, at what point would there be no noticable difference?
I mean, would we see a world of difference if we had a 16bit DSP, or a 32bit?
(you see what I’m getting at)

Luis Caffesse
Studio 3 Productions, Inc.
Austin, Texas

[Graeme Nattress]

The CCDs can take in a range of light that is quite large. To fit this range better into video, and to get around some of the limitations of 8bit video, the image is gamma corrected to about 0.45 before being turned into 8bit video. This obviously needs to be done at a higher precision than 8bits to make the 8bit result as good as possible. Monitors have a gamma of about 2.2, which cancels out the 0.45 gamma correction so that we again see the correct image upon display.

The limits of DSP bit depth are really the noise floor of the CCD and the type of processing that you want the DSP to do. 14 bits sounds more than enough, but I’m surprised that they just don’t go to 16bits as word lengths of 16 usually compute better, even if it’s offering an extra 2 bits you don’t need. Any video DSP programmers here?

Graeme

– http://www.nattress.com – Film Effects for FCP