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Author = Coyle, Eugene;
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Displaying Results 101 - 125 of 164 on page 5 of 7
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On stability of affine blending systems
(2003)
Gao, Ruiyao; O'Dwyer, Aidan; McLoone, Seamus; Coyle, Eugene
On stability of affine blending systems
(2003)
Gao, Ruiyao; O'Dwyer, Aidan; McLoone, Seamus; Coyle, Eugene
Abstract:
This paper presents a novel approach to stability analysis of affine blending systems. The analysis is based on Quadratic Lyapunov functions. The approach considers the nonlinear offset term in affine blending systems as non-vanishing perturbations added to the corresponding nominal linear blending systems. The affine blending systems will be bounded if the corresponding linear blending system is exponentially stable. The bound is determined by an ultimate limit, which is proportional to the maximum of the offset terms of each affine system.
https://arrow.dit.ie/engscheleart/26
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On the Appearance of a Positive Real Pole in the Results of Glottal Closed Phase Linear Prediction
(2010)
O'Cinneide, Alan; Dorran, David; Gainza, Mikel; Coyle, Eugene
On the Appearance of a Positive Real Pole in the Results of Glottal Closed Phase Linear Prediction
(2010)
O'Cinneide, Alan; Dorran, David; Gainza, Mikel; Coyle, Eugene
Abstract:
Often when performing glottal closed phase covariance linear prediction, a positive real pole can appear in the resulting filter transfer function. The commonly adopted approach is to discard this pole, as it does not fit with the usual model of the all-pole vocal tract filter. However, this real pole describes some aspect of the speech signal; this paper provides a novel perspective on its occurrence. This viewpoint has a useful implication to the speech community, especially from the perspective of fitting a glottal pulse to the inverse filtered signal, as the real pole describes the return phase of the glottal flow for certain voice types that adhere to a reasonable criterion. Tests with synthetic signals are performed to validate this approach.
https://arrow.dit.ie/argcon/50
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On the use of the Beta Divergence for Musical Source Separation
(2009)
Fitzgerald, Derry; Cranitch, Matt; Coyle, Eugene
On the use of the Beta Divergence for Musical Source Separation
(2009)
Fitzgerald, Derry; Cranitch, Matt; Coyle, Eugene
Abstract:
Non-negative Tensor Factorisation based methods have found use in the context of musical sound source separation. These techniques require the use of a suitable cost function to determine the optimal factorisation, and most work has focused on the use of the generalised Kullback-Liebler divergence, and more recently the Itakura-Saito divergence. These divergences can be regarded as limiting cases of the parameterised Beta divergence. This paper looks at the use of the Beta Divergence in the context of musical source separation with a view to determining an optimal value of Beta for this problem. This is considered for both magnitude and power spectrograms. In an effort to avoid potential local minima in the Beta divergence, the use of a “tempered” Beta Divergence is also explored.
https://arrow.dit.ie/argcon/69
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Onset based audio segmentation for the Irish tin whistle
(2004)
Gainza, Mikel; Lawlor, Bob; Coyle, Eugene
Onset based audio segmentation for the Irish tin whistle
(2004)
Gainza, Mikel; Lawlor, Bob; Coyle, Eugene
Abstract:
A technique for segmenting tin whistle audio signals according to the position of the note onsets is presented. This method focuses on the characteristics of the tin whistle within Irish traditional music, customising a time-frequency based representation for detecting the instant when a note starts and releases. Musical ornamentation, such as cuts and strikes, are very common in Irish traditional music and are played during the onset stage. Taking advantage of this musical feature, a novel technique for improving the onset time estimation is also presented.
https://arrow.dit.ie/engscheleart/101
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Onset Based Audio Segmentation for the Irish Tin Whistle
(2004)
Gainza, Mikel; Lawlor, Bob; Coyle, Eugene
Onset Based Audio Segmentation for the Irish Tin Whistle
(2004)
Gainza, Mikel; Lawlor, Bob; Coyle, Eugene
Abstract:
A technique for segmenting tin whistle audio signals according to the position of the note onsets is presented. This method focuses on the characteristics of the tin whistle within Irish traditional music, customising a time-frequency based representation for detecting the instant when a note starts and releases. Musical ornamentation, such as cuts and strikes, are very common in Irish Traditional music and are played during the onset stage. Taking advantage of this musical feature, a novel technique for improving the onset time estimation is also presented.
http://mural.maynoothuniversity.ie/702/
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Onset Detection and Music Transcription for the Irish Tin Whistle
(2004)
Gainza, Mikel; Lawlor, Robert; Coyle, Eugene; Kelleher, Aileen
Onset Detection and Music Transcription for the Irish Tin Whistle
(2004)
Gainza, Mikel; Lawlor, Robert; Coyle, Eugene; Kelleher, Aileen
Abstract:
A technique for detecting tin whistle note onsets and transcribing the corresponding pitches is presented. This method focuses on the characteristics of the tin whistle within Irish traditional music, customising a time-frequency based representation for extracting the instant when a note starts and the music notation. Results show that the presented approach improves upon the existing energy based approaches in terms of the percentage of correct detections.
https://arrow.dit.ie/argcon/23
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Onset Detection and Music Transcription for the Irish Tin Whistle
(2004)
Gainza, Mikel; Lawlor, Bob; Coyle, Eugene
Onset Detection and Music Transcription for the Irish Tin Whistle
(2004)
Gainza, Mikel; Lawlor, Bob; Coyle, Eugene
Abstract:
A technique for detecting tin whistle note onsets and transcribing the corresponding pitches is presented. This method focuses on the characteristics of the tin whistle within Irish traditional music, customising a time-frequency based representation for extracting the instant when a note starts and the music notation. Results show that the presented approach improves upon the existing energy based approaches in terms of the percentage of correct detections.
http://mural.maynoothuniversity.ie/697/
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Onset Detection using Comb Filters
(2005)
Gainza, Mikel; Lawlor, Bob; Coyle, Eugene
Onset Detection using Comb Filters
(2005)
Gainza, Mikel; Lawlor, Bob; Coyle, Eugene
Abstract:
A technique for detecting note onsets using FIR comb filters which have different filter delays is presented. The proposed onset detector focuses on the inharmonic characteristics of the onset component and the energy increases of the signal. Both properties are combined by utilising FIR comb filters on a frame by frame basis in order to obtain an onset detection functions, which is suitable for detecting slow onsets. The proposed approach improves upon existing methods in terms of the percentage of correct detections in signal processing.
https://arrow.dit.ie/argcon/13
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Onset detection using Comb Filters
(2005)
Gainza, Mikel; Coyle, Eugene; Lawlor, Bob
Onset detection using Comb Filters
(2005)
Gainza, Mikel; Coyle, Eugene; Lawlor, Bob
Abstract:
A technique for detecting note onsets using FIR comb filters which have different filter delays is presented. The proposed onset detector focuses on the inharmonic characteristics of the onset component and the energy increases of the signal. Both properties are combined by utilizing FIR comb filters on a frame by frame basis in order to obtain an onset detection function, which is suitable for detecting slow onsets. The proposed approach improves upon existing methods in terms of the percentage of correct detections in signals containing slow onsets.
http://mural.maynoothuniversity.ie/20/
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Onset Detection, Music Transcription and Ornament Detection for the Traditional Irish Fiddle
(2005)
Kelleher, Aileen; Fitzgerald, Derry; Gainza, Mikel; Coyle, Eugene; Lawlor, Bob
Onset Detection, Music Transcription and Ornament Detection for the Traditional Irish Fiddle
(2005)
Kelleher, Aileen; Fitzgerald, Derry; Gainza, Mikel; Coyle, Eugene; Lawlor, Bob
Abstract:
By combining techniques used in previous onset detectors, a system that detects note onsets in traditional Irish fiddle tunes has been implemented. The notes detected also include the most common types of ornamentation played by the fiddle. Ornaments are notes of extremely short duration, at most a fifth the length of a regular note. A Short Time Fourier Transform based sub-band technique, which previously gave good results for the Irish tin whistle, was modified to include a threshold approximation more suitable for the fiddle. This system has been tested on a database of real recorded fiddle tunes and good results have been achieved.
http://mural.maynoothuniversity.ie/9762/
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Onset Detection, Music Transcription and Ornament Detection for the the Traditional Irish Fiddle
(2005)
Kelleher, Aileen; Fitzgerald, Derry; Coyle, Eugene; Lawlor, Robert; Gainza, Mikel
Onset Detection, Music Transcription and Ornament Detection for the the Traditional Irish Fiddle
(2005)
Kelleher, Aileen; Fitzgerald, Derry; Coyle, Eugene; Lawlor, Robert; Gainza, Mikel
Abstract:
By combining techniques used in previous onset detectors, a system that detects note onsets in traditional Irish fiddle tunes has been implemented. The notes detected also include the most common types of ornamentation played by the fiddle. Ornaments are notes of extremely short duration, at most a fifth the length of a regular note. A Short Time Fourier Transform based sub-band technique, which previously gave good results for the Irish tin whistle, was modified to include a threshold approximation more suitable for the fiddle. This system has been tested on a database of real recorded fiddle tunes and good results have been achieved.
https://arrow.dit.ie/argcon/76
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Optimal control strategy of UPQC for minimum operational losses
(2004)
Basu, Malabika; Farrell, Michael; Conlon, Michael; Gaughan, Kevin; Coyle, Eugene
Optimal control strategy of UPQC for minimum operational losses
(2004)
Basu, Malabika; Farrell, Michael; Conlon, Michael; Gaughan, Kevin; Coyle, Eugene
Abstract:
The paper deals with a new control technique for a unified power quality conditioner (UPQC), which is the most comprehensive of FACTS devices. The problems of power quality continue to gain in significance because of the proliferation of sensitive and harmonic producing loads in electrical networks. Greater awareness among customers with regard to supply integrity and a desire by suppliers to be able to guarantee a certain degree of power quality to customers is being reflected in the development of innovative power quality solutions. The UPQC, which is a combination of shunt and series compensation, is designed to cater for multiple power quality problems. The shunt compensator provides VAr compensation to the load. It also provides harmonic isolation between the load and the utility supply. The series compensator regulates the incoming voltage quality from the supply side, and keeps the load end voltage insensitive to the supply voltage problems like sag/swell or unbalance. All th...
https://arrow.dit.ie/engscheleart/113
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Orchestration within the Sonification of Basic Data Sets
(2004)
Cullen, Charlie; Coyle, Eugene
Orchestration within the Sonification of Basic Data Sets
(2004)
Cullen, Charlie; Coyle, Eugene
Abstract:
The use of sonification as a means of representing and analysing data has become a growing field of research in recent years and as such has become a far more accepted means of working with data. Existing work carried out as part of this research has focused primarily on the sonification of DNA/RNA sequences and their subsequent protein structures for the purposes of analysis. This sonification work raised many questions as regards the need for sequences to be set to music in a standard manner so that different strands could be analysed by comparison, and hence the orchestration and instrumentation used became of great importance. The basic principles of sonification can be rapidly extended to include many different data elements within a single rendering, and thus the importance of orchestration grows accordingly. Existing work on the use of rhythmic parsing within a sonification had suggested that far more information could be represented when orchestrated in a rhythmic manner tha...
https://arrow.dit.ie/dmccon/28
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Prior Subspace Analysis for Drum Transcription
(2003)
Fitzgerald, Derry; Lawlor, Bob; Coyle, Eugene
Prior Subspace Analysis for Drum Transcription
(2003)
Fitzgerald, Derry; Lawlor, Bob; Coyle, Eugene
Abstract:
This paper introduces the technique of Prior Subspace Analysis (PSA) as an alternative to Independent Subspace Analysis (ISA) in cases where prior knowledge about the sources to be separated is available. The use of prior knowledge overcomes some of the problems associated with ISA, in particular the problem of estimating the amount of information required for separation. This results in improved robustness for drum transcription purposes. Prior knowledge is incorporated by use of a set of prior frequency subspaces that characterise features of the sources to be extracted. The effectiveness and robustness of PSA is demonstrated by its use in a simple drum transcription algorithm.
http://mural.maynoothuniversity.ie/9760/
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Prior Subspace Analysis for Drum Transcription
(2003)
Fitzgerald, Derry; Lawlor, Robert; Coyle, Eugene
Prior Subspace Analysis for Drum Transcription
(2003)
Fitzgerald, Derry; Lawlor, Robert; Coyle, Eugene
Abstract:
This paper introduces the technique of Prior Subspace Analysis (PSA) as an alternative to Independent Subspace Analysis (ISA) in cases where prior knowledge about the sources to be separated is available. The use of prior knowledge overcomes some of the problems associated with ISA, in particular the problem of estimating the amount of information required for separation. This results in improved robustness for drum transcription purposes. Prior knowledge is incorporated by use of a set of prior frequency subspaces that characterise features of the sources to be extracted. The effectiveness and robustness of PSA is demonstrated by its use in a simple drum transcription algorithm.
https://arrow.dit.ie/argcon/31
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Proximity Heating Effects in Power Cables
(2013)
Blackledge, Jonathan; Coyle, Eugene; O'Connell, Kevin
Proximity Heating Effects in Power Cables
(2013)
Blackledge, Jonathan; Coyle, Eugene; O'Connell, Kevin
Abstract:
Researchers at Dublin Institute of Technology (DIT) have developed a new modelling system for evaluating the two and three dimensional heating effects in power cables due to harmonic distortion and proximity field effects.
https://arrow.dit.ie/engscheleart2/57
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Real-time Sound Source Separation: Azimuth Discrimination and Resynthesis
(2004)
Barry, Dan; Lawlor, Robert; Coyle, Eugene
Real-time Sound Source Separation: Azimuth Discrimination and Resynthesis
(2004)
Barry, Dan; Lawlor, Robert; Coyle, Eugene
Abstract:
We present a real-time sound source separation algorithm which performs the task of source separation based on the lateral displacement of a source within the stereo field. The algorithm exploits the use of the pan pot as a means to achieve image localisation within stereophonic recordings. As such, only an interaural intensity difference exists between left and right channels for a single source. Gain scaling and phase cancellation techniques are used in the frequency domain to expose frequency dependent nulls across the Azimuth plane. The position of these nulls in conjuction with magnitude estimation and grouping techniques are then used to resynthesise separated sources. Results obtained from real recordings show that for music, this algorithm outperforms current source separation schemes.
https://arrow.dit.ie/argcon/35
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Real-time Sound Source Separation: Azimuth Discrimination and Resynthesis
(2003)
Barry, Dan; Lawlor, Bob; Coyle, Eugene
Real-time Sound Source Separation: Azimuth Discrimination and Resynthesis
(2003)
Barry, Dan; Lawlor, Bob; Coyle, Eugene
Abstract:
We present a real-time sound source separation algorithm which performs the task of source separation based on the lateral displacement of a source within the stereo field. The algorithm exploits the use of the pan pot as a means to achieve image localisation within stereophonic recordings. As such, only an interaural intensity difference exists between left and right channels for a single source. Gain scaling and phase cancellation techniques are used in the frequency domain to expose frequency dependent nulls across the azimuth plane. The position of these nulls in conjunction with magnitude estimation and grouping techniques are then used to resynthesise separated sources. Results obtained from real recordings show that for music, this algorithm outperforms current source separation schemes.
http://mural.maynoothuniversity.ie/9761/
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Reflections on Energy, Greenhouse Gases, and Carbonaceous Fules
(2014)
Coyle, Eugene; Grimson, William; Basu, Biswajit; Murphy, Mike
Reflections on Energy, Greenhouse Gases, and Carbonaceous Fules
(2014)
Coyle, Eugene; Grimson, William; Basu, Biswajit; Murphy, Mike
Abstract:
In this chapter, we review the history of man’s dependence on carbonaceous fuels for survival, beginning with pre-industrial civilizations, during which charcoal was pro- cessed for thousands of years to smelt iron and copper. In the eighteenth and nineteenth centuries, however, coke and coal became prime energy resources which powered the engine rooms of the industrial revolution. Accompanying the economic and societal benefits of this period was the recognition of the damage resulting from smog owing to excessive burning of coal, which affected both human health and the natural envi- ronment. These pivotal centuries laid the foundation for the advancement of scientific knowledge and discovery which underpinned both engineering developments and the sciences of the natural world, including earth science, atmospheric science, and meteo- rology. These developments in turn led to our modern understanding of climate change and the effect of greenhouse gases. Today coal, petroleum, and n...
https://arrow.dit.ie/engschelebk/14
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Reinventing a Level 7 Programme in Electrical Engineering and Greatly Improving on Student Retention
(2007)
Coyle, Eugene; Murphy, Mike; Costello, Frank; Shoemaker, Leslie
Reinventing a Level 7 Programme in Electrical Engineering and Greatly Improving on Student Retention
(2007)
Coyle, Eugene; Murphy, Mike; Costello, Frank; Shoemaker, Leslie
Abstract:
Following the successful implementation over a number of decades of a three-year Diploma in Electrical and Control Engineering at Dublin Institute of Technology, the programme entered a period of extreme difficulty and uncertainty in the late nineteen ninetees and early years of the new millennium. As with many such engineering programmes, student numbers seeking to enter began to diminish. Furthermore, engagement and retention of students who had enrolled on the programme became evermore challenging, necessitating some radical moves in the formation and operation of the programme and in putting additional student support mechanisms in place. The situation hit rock bottom between the 2000 and 2002 academic years when the programme appeared to be in terminal decline. Following a major effort by the programme committee in redefining the programme, and upon receiving a annual recurrent retention grant from the Higher Education Authority of Ireland, the declining situation was reversed ...
https://arrow.dit.ie/engineducbks/5
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Rhythmic Parsing of Sonified DNA and RNA Sequences
(2003)
Cullen, Charlie; Coyle, Eugene
Rhythmic Parsing of Sonified DNA and RNA Sequences
(2003)
Cullen, Charlie; Coyle, Eugene
Abstract:
Sonification allows existing mathematical data to be used as the model for audio output, notably that the audio produced is related to or representative of that data in some way. Existing work in the field has been largely focused on the aesthetic tailoring of the output audio for compositional benefit rather than as a framework for audio representation and analysis. It is the goal of this research to apply existing techniques for pitch substitution to an analytical method that seeks to define and represent patterns within existing data sets (primarily DNA and RNA sequences). It is often the case that sonified audio has little or no rhythmic component, and it is felt that as rhythm is such an important part of the musical analysis process it should be given far more serious consideration when representing mathematical data as audio. In order to adequately analyse the different rhythms and time signatures that can be used to parse sonified data, a piece of software has been developed...
https://arrow.dit.ie/dmccon/25
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Self-Authentication of Audio Signals by Chirp Coding
(2009)
Blackledge, Jonathan; Coyle, Eugene
Self-Authentication of Audio Signals by Chirp Coding
(2009)
Blackledge, Jonathan; Coyle, Eugene
Abstract:
This paper discusses a new approach to ‘watermarking’ digital signals using linear frequency modulated or ‘chirp’ coding. The principles underlying this approach are based on the use of a matched filter to provide a reconstruction of a chirped code that is uniquely robust in the case of signals with very low signal-to-noise ratios. Chirp coding for authenticating data is generic in the sense that it can be used for a range of data types and applications (the authentication of speech and audio signals, for example). The theoretical and computational aspects of the matched filter and the properties of a chirp are revisited to provide the essential background to the method. Signal code generating schemes are then addressed and details of the coding and decoding techniques considered. Finally, the paper briefly describes an example application which is available on-line for readers who are interested in using the approach for audio data authentication working with either WAV or MP3 files.
https://arrow.dit.ie/engscheleart/157
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Shifted 2D Non-negative Tensor Factorisation
(2006)
Fitzgerald, Derry; Cranitch, Matt; Coyle, Eugene
Shifted 2D Non-negative Tensor Factorisation
(2006)
Fitzgerald, Derry; Cranitch, Matt; Coyle, Eugene
Abstract:
Recently, non-negative matrix factor 2D deconvolution was developed as a means of separating harmonic instruments from single channel mixtures. This technique uses a model which is convolutive in both time and frequency, and so can capture instruments which have both time-varying spectra and time varying fundamental frequencies simultaneously. However, in many cases two or more channels are available, in which case it would be advantageous to have a multi-channel version of the algorithm. To this end, a shifted 2D Non-negative Factorisation algorithm is derived, which extends Non-negative Matrix Factor 2D Deconvolution to the multi-channel case. The use of this algorithm for multi-channel sound source separation of pitched instruments is demonstrated.
https://arrow.dit.ie/argcon/15
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Shifted NMF Using an Efficient Constant-Q Transform for Monaural Sound Source Separation
(2011)
Fitzgerald, Derry; Jaiswal, Rajesh; Coyle, Eugene; Rickard, Scott
Shifted NMF Using an Efficient Constant-Q Transform for Monaural Sound Source Separation
(2011)
Fitzgerald, Derry; Jaiswal, Rajesh; Coyle, Eugene; Rickard, Scott
Abstract:
Non-negative Matrix Factorisation (NMF) based algorithms have found application in monaural audio source separation due to their ability to factorize audio spectrogram into additive part-based basis functions, which typically corresponds to individual notes or chords in music. These separated basis functions are usually greater in number than the active sources, hence clustering is needed for individual source signal synthesis. Although, many attempts have been made to improve the clustering of the basis functions to sources, much research is still required in this area. Recently, Shifted NMF based methods have been proposed as a means to avoid clustering these pitched basis functions to sources. However, the Shifted NMF algorithm uses a log-frequency spectrogram with a fixed number of frequency bins per octave which compromises the quality of separated sources.We show that by replacing the method used to calculate the log-frequency spectrogram with a recently proposed invertible Co...
https://arrow.dit.ie/argcon/61
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Shifted NMF with Group Sparsity for Clustering NMF Basis Functions
(2012)
Jaiswal, Rajesh; Fitzgerald, Derry; Coyle, Eugene; Rickard, Scott
Shifted NMF with Group Sparsity for Clustering NMF Basis Functions
(2012)
Jaiswal, Rajesh; Fitzgerald, Derry; Coyle, Eugene; Rickard, Scott
Abstract:
Recently, Non-negative Matrix Factorisation (NMF) has found application in separation of individual sound sources. NMF decomposes the spectrogram of an audio mixture into an additive parts based representation where the parts typically correspond to individual notes or chords. However, there is a need to cluster the NMF basis functions to their sources. Although, many attempts have been made to improve the clustering of the basis functions to sources, much research is still required in this area. Recently, Shifted Non-negative Matrix Factorisation (SNMF) was used to cluster these basis functions. To this end, we propose that the incorporation of group sparsity to the Shifted NMF based methods may benefit the clustering algorithms. We have tested this on SNMF algorithms with improved separation quality. Results show that this gives improved clustering of pitched basis functions over previous methods.
https://arrow.dit.ie/argcon/82
Displaying Results 101 - 125 of 164 on page 5 of 7
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