Wohler AMP2-DA User's Guide download pdf (Page 79)

821016: AMPx-E8 Series User Guide

Chapter 6 Setup Menu

Phase Bits

For units with SDI de-embedder cards installed, there is a new menu

item available, entitled Phase Bts, which stands for phase bits. These are

bits that are embedded in SDI streams that allow the audio sample rate

to be independent of the video pixel clock, and they are required by the

latest SMPTE standards. However, not all equipment implements these

bits correctly. Normally, this menu item should be left in the Ena

(enabled) setting, which means the phase bits are being used to

properly time the audio samples that are being de-embedded.

If you experience interrupted or garbled audio from the SDI

deembedder, try setting this to Ignor (ignore), which means the

embedded phase words are ignored. If this fixes the garbled audio,

please contact the manufacturer of the upstream equipment to

determine if any firmware updates are available for it. In cases where

phase bits are not embedded at all, or if this menu item is set to Ignor,

the pixel clock will be used as the reference for the de-embedded audio

sample rate.

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Wohler AMP2-DA User's Guide Page 79