Add S/PDIF dump

diff --git a/spdif/2ch-16bit-48khz/2ch-16bit-48khz.sr b/spdif/2ch-16bit-48khz/2ch-16bit-48khz.sr
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diff --git a/spdif/2ch-16bit-48khz/README b/spdif/2ch-16bit-48khz/README
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+-------------------------------------------------------------------------------
+S/PDIF transmission 2-channel 16-bit 48kHz (bitrate: 3.072 Mbit/s)
+-------------------------------------------------------------------------------
+
+This is an example of an S/PDIF transmitter playing the same rectangular
+waveform on both channels.
+
+Logic analyzer setup
+--------------------
+
+The logic analyzer used was an Open Logic Sniffer (OLS) (at 50MHz).
+
+The 50MHz is way above the 3.072MHz so we have some margin to distinguish
+"long" from "short" samples.
+
+  Probe       S/PDIF
+  ------------------
+  0           Data
+