Sound intelligibility enhancement using a psychoacoustic model and an oversampled filterbank
AssigneeAMI Semiconductor, Inc.
InventorsTodd Schneider, David Coode, Robert L. Brennan, Peter Olijnyk
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Abstract
A sound intelligibility enhancement (SIE) system is disclosed. The SIE system uses a psychoacoustic model and preferably an oversampled filterbank wherein the level of a signal-of-interest that falls below the environmental noise is selectively amplified as a function of the input level and frequency so that it is audible above the noise but never exceeds a predetermined maximum output level as a function of frequency. The SIE system can be combined with active noise cancellation.
Claims25
A system for improving a signal intelligibility over an interference signal, the system comprising:
- an analysis filterbank for transforming an information signal in time domain into a plurality of channel information signals in transform domain;
- a signal processor for processing the outputs of the analysis filterbank, the signal processor including a psychoacoustic processor for computing a dynamic range using a psycoacoustic model to render the information signal audible over the interference signal;
- and
- a synthesis filterbank for combining the outputs, of the signal processor to generate an output signal.
Dependencies are inferred from the claim text.