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authorMike Brady <mikebrady@eircom.net>2019-05-16 16:46:27 +0100
committerGitHub <noreply@github.com>2019-05-16 16:46:27 +0100
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@@ -573,7 +573,7 @@ This will be followed by the statistics themselves at regular intervals, for exa
"Corrections in ppm" is the number of frame insertions plus the number of frame deletions (i.e. the total number of corrections), given as a moving average in parts per million. The closer this is to the net corrections, the fewer "unnecessary" corrections that are being made. Third party programs tend to have much larger levels of corrections.
-For reference, a drift of one second per day is approximately 11.57 ppm. Left uncorrected, even a drift this small between two audio outputs will be audible after a short time. The above sample is from a MAc Pro driving a WiFi-connected Raspberry Pi Zero W using an Pimoroni pHAT DAC.
+For reference, a drift of one second per day is approximately 11.57 ppm. Left uncorrected, even a drift this small between two audio outputs will be audible after a short time. The above sample is from an iPhone XS Max to a Raspberry Pi Zero W using a Pimoroni pHAT DAC.
It's not unusual to have resend requests, late packets and even missing packets if some part of the connection to the Shairport Sync device is over WiFi. Late packets can sometimes be asked for and received multiple times. Sometimes late packets are sent and arrive too late, but have already been sent and received in time, so weren't needed anyway...