Topic: how to tell if you have a true 24bit signal??

[dr.ph0b]

how can you tell if you are REALLY getting a 24bit signal. (IE: is there somehting that will tell you what the bitrate is of the signal its being fed, instead of selecting it)

for example, i can record on the pda with the pdaudio card, inputting a 16bit signal, but selecting 24bits, and it will record a 24bit wav. (obviously its padding) so when u open the wav in wavelab it says 24bit, etc etc. so i cant really verify if the signal is really 24bits. 

the reason i want to know is, i have supposedly done what i need to do to make the SBM1 output 24bit instead of 16. but... how can i VERIFY the signal is really 24bits?

[Sean Gallemore]

how can you tell if you are REALLY getting a 24bit signal. (IE: is there somehting that will tell you what the bitrate is of the signal its being fed, instead of selecting it)

for example, i can record on the pda with the pdaudio card, inputting a 16bit signal, but selecting 24bits, and it will record a 24bit wav. (obviously its padding) so when u open the wav in wavelab it says 24bit, etc etc. so i cant really verify if the signal is really 24bits. 

the reason i want to know is, i have supposedly done what i need to do to make the SBM1 output 24bit instead of 16. but... how can i VERIFY the signal is really 24bits?

umm, how'd you get your SBM-1 to send a 24-bit signal?

[peeeper]

SBM-1 24bits?  hmm interesting.  I always thought that Sony was using a CS5335 20-bit stereo A/D chip set for 16 bit in all bit mapping devices.  I would like more information about how you went about doing this, sense it would require a SMC to be replaced; without the correct soldering equipment it would be futile.

[Sean Gallemore]

that potato is truely disgusting

[dr.ph0b]

SBM-1 24bits?  hmm interesting.  I always thought that Sony was using a CS5335 20-bit stereo A/D chip set for 16 bit in all bit mapping devices.  I would like more information about how you went about doing this, sense it would require a SMC to be replaced; without the correct soldering equipment it would be futile.

thats not answering my question
the DSP chip is the CXD8482Q. The DSP has a pin for selecting 16 or 24 bit output. according to jon at jklabs, the schematic suggests that the full 24 bits are sent to the CS8402 xmitter and the CS8402 supports 24 bits. by default the pin is set for 16bit output. (ie: its tied to ground) if u remove from the ground, and jumper to the pin supplying V+ it turns on 24bit output.  i bought an sbm1 on ebay for the purpose of destroying , so im expiriementing, with information jon from jklabs is feeding me, since he knows his stuff and has the schematics, etc.

anyway... i have removed the 16/24 output rate pin from ground and jumpered to the V+ pin. So Im trying to find out how i can find out the actual bitrate of the signal that its putting out now.   anyone know??

[Sean Gallemore]

if you open up a wav file in sound forge it will tell you the bit depth and cycles at the bottom

[BC]

there is a bit meter in wavelab (under the tools menu?). If the signal is padded you will only see the top 16 bits of the meter light up.

Happy recording,
Ben

[dr.ph0b]

there is a bit meter in wavelab (under the tools menu?). If the signal is padded you will only see the top 16 bits of the meter light up.

bingo, thats what im looking for! cause i can record a 24bit wav with a 16bit dat, so going by whatever wavelab or SF says the file is, doesnt really tell you if the source was true 24bit.  Anyway.. im getting there! I found out, i had to disable the SBM pin as well, because thats the thing that takes the signal converts to 20bits then dithers to 16. so even tho i changed the output pin to 24bit, i was still getting a 16bit signal. when i disabled the sbm pin, i get a 24bit signal now   the signal is way way too hot tho, so i guess there is more to the equation

[MattD]

I never knew the SBM had a 24-bit chip in there.

As for the current hot signal problem, do you mean in the digital realm, or do you mean that you're clipping everything you send in (everything in is too hot)?

[zhianosatch]

there is a bit meter in wavelab (under the tools menu?). If the signal is padded you will only see the top 16 bits of the meter light up.

Happy recording,
Ben

yep, that's the ticket, phob!

[dklein]

Also, in Cool Edit Pro you can grab a sample and go analyze, statistics
Then look at the actual bit depth

[F.O.Bean]

so whats up w/ this doc

[dr.ph0b]

I never knew the SBM had a 24-bit chip in there.

As for the current hot signal problem, do you mean in the digital realm, or do you mean that you're clipping everything you send in (everything in is too hot)?

clipping in the digital realm.  altho when i reocrd to a 32bit float file in wavelab, the levels arent as hot and i get the dial up to 1 before i clip. (over 0)   there are probbaly some other tweaks that need to be done. jon from jklabs has been very cool in giving me info and the pinouts of the IC's and schematics. cause im like a blind man in a maze    

[shaggy]

...this shit is endlessly fascinating....

It isn't housed in an entirelly black box for no reason....jesus, what the hell else is in there?  I remeber opening up a D6 once and regretting it later....it was PACKED! 

Any way we can get photos inside this SBM cadaver?

THANX,
ANDY

[zhianosatch]

so this will end up being an "oade mod 24 bit former sbm-1"
sweetness, good luck pulling it off, and +T to jon - he knows his shit
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