Re: Native Device Formats
Re: Native Device Formats
- Subject: Re: Native Device Formats
- From: Brian Willoughby <email@hidden>
- Date: Thu, 5 Jun 2008 17:12:46 -0700
For those that care about the details, S/PDIF actually has two modes:
24-bit and 20-bit. Each is capable of carrying fewer significant
bits by zeroing out the excess LSBs. However, in 20-bit mode, 4 bits
become meta data, and thus would result in (minor) distortion of the
audio if assumed to be part of a 24-bit audio sample. In other
words, S/PDIF does not always send 24 bits, but it does always send
20 bits.
On a related note, TobyBear has an AU which displays the number of
bits being used. If you replace your AV receiver with a digital-in
Mac with this AU displayed, you could confirm the bits transmitted.
Brian Willoughby
Sound Consulting
On Jun 5, 2008, at 06:23, Mikael Hakman wrote:
I don't know about MB but I have verified using an external AV
receiver connected to an MBP and an iMac by S/PDIF that if you select
44.1 or 48 or 96 kHz in SAM panel then this is the sample rate
arriving to AV receiver. Both my MBP and iMac use Realtek HD
circuits, perhaps MB too. I've been unable to verify number of bits
because this isn't shown on my AV receiver's status display but I
would be surprised if the number of bits isn't what you select. Note
that S/PDIF sends always 24 bits even if not all of them are used.
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