CONTROLLING LOUDNESS OF SPEECH IN SIGNALS THAT CONTAIN SPEECH AND OTHER TYPES OF AUDIO MATERIAL

摘要

An indication of the loudness of an audio signal containing speech and other types of audio material is obtained by classifying segments of audio information as either speech or non-speech. The loudness of the speech segments is estimated and this estimate is used to derive the indication of loudness. The indication of loudness may be used to control audio signal levels so that variations in loudness of speech between different programs i s reduced. A preferred method for classifying speech segments is described.