add spectrogram doc screenshots

jopohl · Aug 24, 2017 · 72a9d78 · 72a9d78
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diff --git a/doc/screenshots/spectrogram.png b/doc/screenshots/spectrogram.png
diff --git a/doc/screenshots/spectrogram_channels.png b/doc/screenshots/spectrogram_channels.png
diff --git a/doc/screenshots/spectrogram_filter_bandwidth.png b/doc/screenshots/spectrogram_filter_bandwidth.png