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To better make use of unlabeled data, we also describe a semi-supervised model finetuning pipeline that can further improve the performance of the model. The choices of the bandwidths of the subbands can be determined by a priori knowledge or expert knowledge on the characteristics of the target source in order to optimize the performance on a certain type of target musical instrument.
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In this paper, we propose band-split RNN (BSRNN), a frequency-domain model that explictly splits the spectrogram of the mixture into subbands and perform interleaved band-level and sequence-level modeling. However, recent model designs for MSS were mainly motivated by other audio processing tasks or other research fields, while the intrinsic characteristics and patterns of the music signals were not fully. The performance of music source separation (MSS) models has been greatly improved in recent years thanks to the development of novel neural network architectures and training pipelines. Optimized high-order graphical equalizers can be widely used in audio signal processing applications. In an example case, the proposed method was able to meet the given peak-error limitations of $ pm 2~hbox$, when the total order of the graphical equalizer was 328, whereas the non-optimized filter could not meet the requirements even when the total order was raised to 672. The optimization is done offline, and during filtering only the gains of the band filters are altered.
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The optimization of the filter order affects the shape of the transition band, thus enabling the search for the optimum shape relative to the adjacent filter. This letter proposes a filter optimization algorithm for a high-order graphic equalizer, which minimizes the errors in the transition bands by iteratively optimizing the orders of adjacent band filters. However, all practical filters have transition bands, which interact with the adjacent bands and create errors in the desired magnitude response. A high-order graphic equalizer has the advantage that the gain in one band is highly independent of the gains in the adjacent bands.