Asus Xonar D2X User Manual download pdf (Page 86)

ASUS Xonar D2X

the playback speed (2X, only on Windows XP) and record the accelerated analog

signal. PMP will convert the signal back to the normal speed with very high-quality

(118dB SNR), low distortion (-108dB) time-scaling algorithm. ALT technology can

shorten the total conversion process. Please refer to the graph below:

Playback Record

Original

Digital

Data

Converted

Digital Data

2X Analog

Output

Signal

Q8: What's the application of "S/PDIF in loopback"?

Answer:

"SPDIF in loopback" is the process of looping back the sound card's S/PDIF digital

input signal directly to the S/PDIF output. It's useful mainly for two purposes:

• transforming electrical signals from coaxial cable to a fiber optical cable, or vice

versa.

• using the PC as a SPDIF bridge (typically as a media center): for example,

connect other devices like DVD players to the Xonar D2X’s S/PDIF input and

then connect its SPDIF output to an AV receiver or decoder. When you would

like to send the player device's audio to the AV receiver, you need to have the

Xonar sound card's "S/PDIF in loopback" enabled to redirect the player's input

signal to output to the AV receiver.

Since "SPDIF In Loopback" is the hardware’s high-fidelity pass-through path, not

all sound effects will be applied to the signals.

Q9: Will PCM sound output through S/PDIF be just 2 channels even with

different analog output channels?

Answer:

The S/PDIF protocol specification (IEC-60958) can only carry 2-channel PCM

data or non-PCM AC3/DTS data. So, when a user selects PCM output for S/PDIF,

the Xonar sound card will always deliver 2 channel PCM data through the S/PDIF

output port. For attaining 5.1 channel surround sounds, you can select Dolby

Digital Live or DTS Interactive encoding output from the S/PDIF out menu, which

will allow the Xonar D2X to deliver 5.1 surround sound for games, DVD movies,

and even stereo music.

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Asus Xonar D2X User Manual Page 86