Listening tests were performed to define the perceived loudness threshold above which a number of mobile terminal alert tones became only partially masked by environmental noise. The relative intensity of the noise and alert tone at the partial masking threshold was then used to create masker+maskee samples to be objectively measured with various loudness models. The objective estimates were then compared to the subjective results to derive recommendations as to how best to objectively estimate the partial masking thresholds.
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