Single-channel noise reduction of speech signals whose noise changes more slowly than speech signals, by estimating non-steady noise using power calculation and time-delay stages

摘要

The method involves a non-steady noise estimation (GSI) which allows effective noise reduction in combination with a selection stage (AS). The selection stage checks if the estimation is acceptable. A stage for calculating the power and power maximum of the input signal and a time delay stage for the non-steady noise component are used in the checking. A time delay stage (TX) extends the analysis range for the GSI stage into the future time domain. A bypass controller (BS) prevents the influence of unwanted speech components in the determination of a noise filter (GF). An Independent claim is included for a single-channel noise reduction apparatus.