In many applications it is desirable to measure and control the subjective loudness of audio signals. However, there is a lack of data regarding loudness perception for typical program material and an ITU-R study is underway to examine this matter. In the present study, a series of formal subjective tests were conducted to evaluate the perceived loudness of a broad variety of typical program materials, including music and speech. Subjects adjusted the level of various audio materials until their perceived loudness was equal to that of a reference signal. Tests were designed to examine the relative subjective loudness for a variety of playback conditions. The just noticeable differences (JND) in perceived loudness was also examined.
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