FIELD: suppression of echo signals. SUBSTANCE: new measure (qa,qp) of quality secures base for new selection of filter and process of transmission of coefficients. Measure of quality presents characteristic of filter in adaptive device for suppression of echo signal. Measure of correlation between signal carrying echo signal and signal of evaluation of echo signal formed by above-mentioned filter is rated in correspondence with process. Measure of power of residual signal formed by difference between mentioned signal of evaluation of echo signal and above- mentioned signal carrying echo signal is estimated. Measure of quality is calculated by division of measure of correlation obtained as result of measurement into measure of power obtained as result of evaluation. Adaptive and programmable filters are used for suppression of echo signal and measures of quality for both of them are calculated and compared. Best of two filters determined by measure of quality is employed to model path ( 570, 580 ) of echo signal and coefficients of filter are copied by another filter. EFFECT: raised quality of speech. 11 cl, 7 dwg
