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發表於 2008-3-15 16:57:57
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AnandTech preview 裡面有提到:
We were excited to learn that AMD was seeking HDMI 1.3b certification of the RS780, but it turns out that will not happen. xvYCC color space is fully supported and Deep Color (10-bit) was on the list, but the specification calls for 4:4:4 and the RS780 supports 4:2:2. On the audio side, the HDMI interface offers support for 2-channel LPCM, Dolby Digital 5.1, or DTS 5.1. Multi-Channel LPCM is not supported due to an available audio bandwidth of 1.6Mb/s over the HDMI interface.
所以照這網友說的合理嗎
So the HDMI audio of 780G seems to be limited by hardware.
- LPCM 2-channel/16-bit/48kHz = 1.536Mb/s
- DTS = 1.536Mb/s
- Dolby Digital 5.1 = 640kb/s
The usual S/PDIF supports a wider bandwidth of 12.3Mb/s. Multichannel LPCM requires a bandwidth of:
- LPCM 8-channel/24-bit/192kHz = 36.9 Mb/s (= 8 x 24 x 192/1000)
HDMI 1.2 supports a bandwidth of 4.9Gb/s, video/audio combined, while HDMI 1.3 supports 10.2Gb/s. |
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