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Comfortable reproduction of music in conditions with varying ambient noises requires constant changes in sound volume (with changes in noise level) and equalization (with changes in noise spectrum).
Automatic Volume and Equalization control for Music and Entertainment (AVQ-Me) technology amplifies and equalizes musical content according to ambient noise characteristics providing equal perceptual loudness, intelligibility and sound coloration in conditions where noise level and spectrum are changing dynamically. The technology is suitable for high quality music and can be used in virtually every application where sound and music are reproduced in varying noisy conditions such as modern mobile phones, digital audio players, portable gaming consoles and car radios. The technology greatly improves listener experience in mobile conditions.
AVQ-Me can be easily integrated into devices already having a microphone used for either voice communication or recording. The microphone is used to monitor the current noise conditions. Its signal is analyzed in different frequency bands and the ambient noise parameters are extracted. The output sound is then amplified and equalized accordingly to ensure equal intelligibility and perceptual loudness in changing conditions.
The technology has special protection against influence of speech on noise estimations so that the user and people around him can speak freely without introducing any artifacts on music. In case the technology is used with loudspeakers (e.g. car stereo), Alango acoustic echo canceller is used to remove the influence of the audio feedback on the noise estimations.