Abstract: Initially, voice signal components (4) are extracted from the audio signal (1) in a procedure for determining a measure of quality (2) of an audio signal (1). Based on this signal, a reference signal (6) is then generated by means of noise suppression (7) and interruption interpolation (8). This signal is compared with the voice signal (4) and an intrusive quality value (10) is determined in this way. A further quality value (15) is determined by establishing and evaluating (12, 14) codec-related signal distortions in the voice signal (4). Another quality value (17) is generated from the information relating to the detected signal interruptions (8). The measure of quality (2) is finally determined as a linear combination (16) of the various quality values (10, 15, 17, 18).