Electrical audio signal processing systems and devices – Dereverberators
Reexamination Certificate
2007-01-23
2007-01-23
Chin, Vivian (Department: 2615)
Electrical audio signal processing systems and devices
Dereverberators
C708S322000, C379S406010, C379S406080
Reexamination Certificate
active
10138005
ABSTRACT:
A system and method facilitating signal enhancement utilizing an adaptive filter is provided. The invention includes an adaptive filter that filters an input based upon a plurality of adaptive coefficients and modifies the adaptive coefficients based on a feedback output. A feedback component provides the feedback output based, at least in part, upon a non-linear function of the acoustic reverberation reduced output. Optionally, the system can further include a linear prediction (LP) analyzer and/or a LP synthesis filter. The system can enhance signal(s), for example, to improve the quality of speech that is acquired by a microphone by reducing reverberation. The system utilizes, at least in part, the principle that certain characteristics of reverberated speech are measurably different from corresponding characteristics of clean speech. The system can employ a filter technology (e.g. reverberation reducing) based on a non-linear function, for example, the kurtosis metric.
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Florencio Dinei Afonso Ferreira
Gillespie Bradford W.
Malvar Henrique S.
Amin Turocy & Calvin LLP
Chin Vivian
Suthers Douglas
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