Spectral band substitution to avoid howls and sub-oscillation

摘要

A listening device for processing an input sound to an output sound, includes an input transducer for converting an input sound to an electric input signal, an output transducer for converting a processed electric output signal to an output sound, a forward path being defined between the input transducer and the output transducer and including a signal processing unit for processing an input signal in a number of frequency bands and an SBS unit for performing spectral band substitution from one frequency band to another and providing an SBS-processed output signal, and an LG-estimator unit for estimating loop gain in each frequency band thereby identifying plus-bands having an estimated loop gain according to a plus-criterion and minus-bands having an estimated loop gain according to a minus-criterion. Based on an input from the LG-estimator unit, the SBS unit is adapted for substituting spectral content in a receiver band of the input signal with spectral content from a donor band in such a way that spectral content of the donor band is copied and possibly scaled with a scaling function and inserted in the receiver band instead of its original spectral content, wherein the receiver band is a plus-band and the donor band is a minus-band.

主权项

1. A listening device for processing an input sound to an output sound, the listening device, comprising:
an input transducer for converting an input sound to an electric input signal; an output transducer for converting a processed electric output signal to an output sound; and a forward path defined between the input transducer and the output transducer and comprising
a signal processing unit for processing an input signal in a number of frequency bands,an SBS unit for performing spectral band substitution from one frequency band to another and providing an SBS-processed output signal, andan LG-estimator unit for estimating loop gain in each frequency band thereby identifying plus-bands according to a plus-criterion and minus-bands according to a minus-criterion, wherein based on an input from the LG-estimator unit, the SBS unit is adapted for substituting spectral content in a receiver band of the input signal with spectral content from a donor band in such a way that spectral content of the donor band is copied and inserted in the receiver band instead of its original spectral content, wherein the receiver band is a plus-band and the donor band is a minus-band, and the SBS unit is further configured to select the donor band based on a model of the human auditory system to provide minimum distortion, and a condition for selecting a frequency band FBi as plus band is that for that band MAG(Hcl(FBi)) is larger than 1.3·MAG(FG(FBi)).