Method of recognising a sound event

A system for recognising at least one of a non-verbal sound event and a scene in an audio signal comprising a sequence of frames of audio data, the system comprising a microphone to capture the audio data and one or more processors, wherein the one or more processors are configured to:

• for each frame of the sequence of frames of audio data:
• receive at least one sound class score, wherein each sound class score is representative of a degree of affiliation of the frame with a sound class of a plurality of sound classes;
• and
• obtain a value for a property associated with the frame;
• for a sound class score of the at least one sound class scores:
• determine a confidence that the sound class score is representative of a degree of affiliation of the frame with the sound class by processing the value for the property associated with the frame, wherein the value is processed using a learned model for the property;
• and
• adjust the sound class score for the frame based at least on the determined confidence,
• wherein the one or more processors are further configured to process the adjusted sound class scores for the sequence of frames of audio data to recognise the at least one of a non-verbal sound event and a scene.