Mechanisms for Low-Amplitude Echo Estimation

摘要

A system and method for identifying minor echoes present in an input signal in the situation where a set of major echoes has already been identified from the input signal. The method includes: computing a spectrum F corresponding to a sum of the major echoes; computing a weighted power spectrum SM of the spectrum F; subtracting the weighted power spectrum SM from a weighted power spectrum PIN of the input signal to obtain a difference spectrum; performing a stabilized division of the difference spectrum by a conjugate of the spectrum F to obtain an intermediate spectrum; computing an inverse transform of the intermediate spectrum to obtain a time-domain signal; and estimating parameters one or more of the minor echoes from the time-domain signal. The echo parameters are usable to remove at least a portion of the one or more estimated minor echoes from the input signal.

主权项

1. A non-transitory memory medium for identifying minor echoes present in an input signal in the situation where two or more major echoes, also present in the input signal, have already been identified, wherein the memory medium stores program instructions, wherein the program instructions, when executed by one or more processors, cause the one or more processors to:
(a) subtract a weighted power spectrum SM from a weighted power spectrum of the input signal to obtain a difference spectrum, wherein the weighted power spectrum SM is a weighted power spectrum of a spectrum F, wherein the spectrum F corresponds to a sum of the major echoes; and (b) estimate one or more of the minor echoes from a time-domain signal to obtain echo parameters for the one or more minor echoes, wherein the time-domain signal is determined based at least in part on the different spectrum and the spectrum F.