s/pdif, fixed or floating

sr20dem0n · 13th December 2005, 10:17 PM

Anyone know if s/pdif uses fixed or floating point? I can't seem to find the answer

rfbrw · 13th December 2005, 10:22 PM

Quote:

Originally posted by sr20dem0n
Anyone know if s/pdif uses fixed or floating point? I can't seem to find the answer

Such things don't apply to SPDIF.

sr20dem0n · 13th December 2005, 10:23 PM

how so?

rfbrw · 13th December 2005, 10:30 PM

SPDIF is only SPDIF while it is travelling between the transmitter and receiver.

nemestra · 13th December 2005, 10:36 PM

SPDIF unless it is being used to carry a coded format signal such as DTS or AC3 is normally carrying PCM data, for example, from a CD transport to a DAC. PCM data is fixed point.

James

rfbrw · 13th December 2005, 10:41 PM

Quote:

Originally posted by nemestra
SPDIF unless it is being used to carry a coded format signal such as DTS or AC3 is normally carrying PCM data, for example, from a CD transport to a DAC. PCM data is fixed point.

James

But that isn't the raw SPDIF datastream. The point is you cannot do anything with the raw SPDIF datastream other than send it from point A to B.

sr20dem0n · 13th December 2005, 10:43 PM

it's a protocol for data transfer between the transmitter and receiver, I'm just trying to find out if the digital signal it carries in traditional audio applications uses fixed or floating point.

In other words, with a fixed point digital signal you're only using the maximum possible resolution when playing at 0 dB. If you play something at -12 dB you lose 2 bits of resolution, the lower it is the more resolution you lose. With floating point you don't lose any resolution. So, with digital audio, do you lose any resolution when playing something at -x dB?

sr20dem0n · 13th December 2005, 10:44 PM

Quote:

Originally posted by nemestra
SPDIF unless it is being used to carry a coded format signal such as DTS or AC3 is normally carrying PCM data, for example, from a CD transport to a DAC. PCM data is fixed point.

James

Thanks, that's all I was looking for

13th December 2005, 10:17 PM	#1
sr20dem0n diyAudio Member Join Date: Apr 2005 Location: Broomfield, CO	s/pdif, fixed or floating Anyone know if s/pdif uses fixed or floating point? I can't seem to find the answer

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13th December 2005, 10:23 PM	#3
sr20dem0n diyAudio Member Join Date: Apr 2005 Location: Broomfield, CO	how so?

13th December 2005, 10:30 PM	#4
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	SPDIF is only SPDIF while it is travelling between the transmitter and receiver.

13th December 2005, 10:36 PM	#5
nemestra diyAudio Member Join Date: Jul 2002 Location: UK	SPDIF unless it is being used to carry a coded format signal such as DTS or AC3 is normally carrying PCM data, for example, from a CD transport to a DAC. PCM data is fixed point. James

13th December 2005, 10:43 PM	#7
sr20dem0n diyAudio Member Join Date: Apr 2005 Location: Broomfield, CO	it's a protocol for data transfer between the transmitter and receiver, I'm just trying to find out if the digital signal it carries in traditional audio applications uses fixed or floating point. In other words, with a fixed point digital signal you're only using the maximum possible resolution when playing at 0 dB. If you play something at -12 dB you lose 2 bits of resolution, the lower it is the more resolution you lose. With floating point you don't lose any resolution. So, with digital audio, do you lose any resolution when playing something at -x dB?

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