A Novel Multistage Loudness Control Algorithm for Audio Processing

摘要

Modern audio broadcast processors are designed to provide an audio with consistent loudness within a specified dynamic range. In general a tight control over the processed audio level is provided by the Automatic Gain Control (AGC) mechanism. As most of the other processing functions are tuned for a pre-defined signal level; this arises the need for multistage loudness control. This paper presents the gain control mechanism employed in various stages of the proposed multi stage Audio Loudness Control (MALC) and the interaction between various stages. We also present results which explain how the proposed scheme provides better control over loudness against the signal level. The paper also emphasizes the importance of frequency weighing based loudness measure.