Pre-trained Spatial Priors on Multichannel NMF for Music Source Separation
This incremental improvement addresses sound source separation for polyphonic ensembles, particularly in orchestra recordings.
The paper tackles the problem of separating individual sound sources in music recordings by integrating a pre-trained spatial mixing filter into multichannel non-negative matrix factorization, resulting in improved performance over conventional methods.
This paper presents a novel approach to sound source separation that leverages spatial information obtained during the recording setup. Our method trains a spatial mixing filter using solo passages to capture information about the room impulse response and transducer response at each sensor location. This pre-trained filter is then integrated into a multichannel non-negative matrix factorization (MNMF) scheme to better capture the variances of different sound sources. The recording setup used in our experiments is the typical setup for orchestra recordings, with a main microphone and a close "cardioid" or "supercardioid" microphone for each section of the orchestra. This makes the proposed method applicable to many existing recordings. Experiments on polyphonic ensembles demonstrate the effectiveness of the proposed framework in separating individual sound sources, improving performance compared to conventional MNMF methods.