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عمومی::
نوفهی سفید، صدا سفید
They were then asked to listen to their favourite song through their PLD within a sound-treated room in the absence or presence of background noise (speech babble, white noise, train or bus noise recorded in situ (50, 60 or 75dBA) and adjust the PLD to the most comfortable loudness.
Figure 6.14:PLD mean (+/- SD) real ear sound levels at preferred listening levels in quiet and in four types of background noise at three intensities (WN = white noise).
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