Dynamic Loudness Control for In-Car Audio
Episode details
Episode description
The preferred listening level for music and speech in cars depends on the environmental noise, which can vary dynamically. A volume control system is designed to adjust the playback volume based on continuous measurements of the noise. The preferred listening levels under noisy conditions were determined in a user study. Comparison of the loudnesses of the noise and the target signal has shown to be a useful criterion for determining the optimal amplification. When music is concerned, timbral correction based on the equal loudness curves is applied in order to minimize coloration. The speech signals of a telephone call can be manipulated to a larger extent since the aesthetics are secondary. We show methods that maximize intelligibility under given limitations of the playback system.
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