Patent ID: 9084049
Filing Date: 2015-07-14
Classification: H03H,H04L,H04R

Abstract:
1. A method for equalizing an audio signal, wherein the method comprises: receiving the audio signal; applying an adaptive filter to the audio signal to generate a filtered audio signal; driving an acoustic output transducer with the filtered audio signal to generate a sound field; generating a detection audio signal by detecting the sound field after propagating through an acoustic channel with an acoustic input transducer; obtaining a first frequency-domain representation from the detection audio signal that is a composite spectral magnitude response of the acoustic output transducer, the acoustic channel and the acoustic input transducer; applying a delay to the filtered audio signal to obtain a delayed filtered audio signal, wherein the delay includes an approximation of propagation delays of the sound field through the acoustic channel; obtaining a second frequency-domain representation from the delayed filtered audio signal; processing the first frequency-domain representation, the second frequency-domain representation, and a third frequency-domain representation from spectral components of a target spectral magnitude response to generate an estimated spectral magnitude response correction signal; obtaining an equalization-filter control signal from the estimated spectral magnitude response correction signal; and configuring adapting filter characteristics of the adaptive filter in response to the equalization-filter control signal.