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Old 18th February 2013, 08:26 AM   #1
Pudl is offline Pudl
diyAudio Member
Join Date: Sep 2012
Default Converter IS 32 bit to SPDIF

Hello together,

for testing purpose I'm searching for a converter from IS to SPDIF. My great problem is, that I have an Audio resolution of 32 Bit and I need the complete 32 Bits. All the converter I have found only have a maximum of 24 Bit audio resolution.
Has anyone an idea where to find a chip on a pcb (e.g. eva-board) which can convert this audio resolution?

Best regards
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Old 18th February 2013, 12:26 PM   #2
chaparK is offline chaparK  Luxembourg
diyAudio Member
Join Date: Apr 2010
Location: Luxembourg
Well my understanding is that SPDIF simply cannot convey 32-bit data in its standard form.

Indeed, a SPDIF subframe is 32-bit wide. A subframe is the whole set of information that is transferred for each channel at each sampling period.

In this subframe, 20 bits were originally dedicated for coding the audio sample.
This can be extended to 24 bits by fitting the 4 LSBs in the 4-bit auxiliary data field.
The 8 remaining bits are:
- The preamble (4 bits), cannot be 'hacked'
- The V, U, C and P bits, cannot be 'hacked' neither.

I doubt there's any 32-bit SPDIF encoder: most receivers wouldn't be able to decode the stream.
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Old 18th February 2013, 12:30 PM   #3
Pudl is offline Pudl
diyAudio Member
Join Date: Sep 2012
Oh, thanks chapark for this information. Then I have to search for another way to monitor my 32 bit IS signal.
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Old 24th October 2014, 06:23 PM   #4
kfshu2 is offline kfshu2  Taiwan
diyAudio Member
Join Date: Oct 2014
Default true 32 bits converter i2s <--> spdif

i think you can try the following link

ComTrue Inc. - Products
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