Dialog detector

A method of obtaining a confidence score that represents a probability of presence of dialog in a current frame of an input audio signal, the method comprising:

• dividing the input audio signal into a plurality of frames;
• extracting frame audio features from each frame;
• determining a set of context windows, each context window including a number of frames surrounding the current frame;
• deriving, for each context window, a relevant context audio feature for the current frame based on the frame audio features of the frames in each respective context;
• concatenating each context audio feature to form a combined feature vector to represent the current frame;
• obtaining a speech confidence score that represents a probability of presence of dialog in the current frame using the combined feature vector;
• converting frames in a left channel and a right channel to a spectrum representation of frames;
• removing uncorrelated signals in the left channel and the right channel by applying frequency dependent gains to the spectrum representation in the left channel and the right channel, respectively;
• obtaining a downmixed signal from the left and right channels;
• and
• using said downmixed signal as said input audio signal.