Method and system for suppressing echoes and noises in environments under variable acoustic and highly feedback conditions

System for canceling echoes and environmental noises with variable acoustic conditions and high feedback, in the interior of a vehicle, permitting the establishment of a clear, audible communication between the occupants of different areas of said vehicle, which comprises:

• at least a first microphone (1) in a first site, susceptible to receiving an existing original speech signal (5), and to convert it into an electric signal (13) using an assembly comprising several A/D-D/A converters, amplifiers and filters;
• and
• at least one speaker (3) for receiving said electric signal (13) and to convert it into an acoustic signal constituting a reproducible, audible communication (7), which is fed back to said first microphone (1), together with a new original speech signal (5) and noise (9) existing in the area, said first microphone (1) and conversion means providing an electric signal (10);
• and
• an operative acoustic echo canceller system (15) using said electric signal (13) which will be reproduced and an electric signal (10) supplied by said first microphone comprising the feedback of said reproduced audible communication (7), a new existing, original existing speech signal (5) and other acoustic noise signals (9) existing in the area, whose system (15) is applied to eliminate the feedback of said audible communication (7) seized by said first microphone,
• characterized in that it integrates an assembly applied to an further additional filtering of the electric signal (11) after leaving said acoustic echo canceller system (15) comprising a two-step Wiener filter (16), a first (22) of them applied to the elimination of a possible residual echo that is not suppressed by the echo canceller system (15) and a second one (23) for carrying out the elimination of the noise in the area, whose two-step filter (16) is calculated by means of an estimate of the spectral power density of said residual echo and an estimate of the spectral power density of said noise, both existing in said signal (11).