Patent ID: 6628788
Filing Date: 2003-09-30
Classification: H03G

Abstract:
An apparatus for the noise-dependent adaptation of a acoustic useful signal (S) in a listening location, said apparatus comprising:a source that generates an electrical useful signal (X), which is adjustable in response to a control signal; a loudspeaker that receives said electrical useful signal and provides an audio signal indicative thereof; an acoustic receiver that senses audio within the listening location and provides an electrical listening signal (Xm) indicative thereof, wherein said electrical listening signal (Xm) includes components associated with said acoustic useful signal (S) and an acoustic noise signal (N); signal processing means responsive to said electrical listening signal (Xm), for processing said electrical listening signal (Xm) to extract a useful signal component (Xs) and provide a signal indicative thereof; a comparator that receives and compares signals indicative of said electrical listening signal (Xm) and said useful signal component (Xs), and provides a difference signal indicative thereof; and an amplification control device that receives said difference signal and provides said control signal to control said tone source.