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Author = Coyle, Eugene;
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Displaying Results 126 - 150 of 164 on page 6 of 7
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Shifted Non-negative Matrix Factorisation for Sound Source Separation
(2005)
Fitzgerald, Derry; Cranitch, Matt; Coyle, Eugene
Shifted Non-negative Matrix Factorisation for Sound Source Separation
(2005)
Fitzgerald, Derry; Cranitch, Matt; Coyle, Eugene
Abstract:
A shifted non-negative matrix factorisation algorithm is derived, which offers advantages over previous matrix factorisation techniques for the purposes of single channel source separation. It represents a sound source as translations of a single frequency basis function. These translations approximately correspond to notes played by an instrument. Results are presented for a set of synthetic data, and on a single channel recording of piano and clarinet. Though the system is aimed at musical recordings, the techniques can be applied to any data which contains shifted versions of an underlying factor, and so the algorithm could possibly be used in other applications such as image processing.
https://arrow.dit.ie/argcon/28
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Mark
Single Channel Sound Source Separation Combining Delay Estimation and the AdRess Algorithm
(2008)
Leddy, Mark; Barry, Dan; Dorran, David; Coyle, Eugene
Single Channel Sound Source Separation Combining Delay Estimation and the AdRess Algorithm
(2008)
Leddy, Mark; Barry, Dan; Dorran, David; Coyle, Eugene
Abstract:
A method for single channel source separation is proposed in this paper, which uses estimates fo the delay co-efficient of individual sources within an echoic mixture using autocorrelation, following which a "pseudo-stereo mixture" is generated, to which the ADRess algorithm can be applied. The system is evaluated in a theoretical situation, where the mixture signal to be separated consists of two individual source signals, and a delayed version of each signal. Estimates of the individual delay lengths are made and then used to create a pseudo stereo mix, where one channel consists of the orginal mixture signal, and the second channel consists of the original signal shifted by the length of the delay calculated for each source. The ADRess algorithm is then used to separate sources from the new pseudo stereo mixture.
https://arrow.dit.ie/argcon/4
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Single Channel Source Separation using Short-time Independent Component Analysis
(2005)
Barry, Dan; Fitzgerald, Derry; Coyle, Eugene
Single Channel Source Separation using Short-time Independent Component Analysis
(2005)
Barry, Dan; Fitzgerald, Derry; Coyle, Eugene
Abstract:
In this paper we develop a method for the sound source separation of single channel mixtures using Independent Component Analysis within a time-frequency representation of the audio signal. We apply standard Independent Component Analysis techniques to contiguous magnitude frames of the short-time Fourier transform of the mixture. Provided that the amplitude envelopes of each source are sufficiently different, it can be seen that it is possible to recover the independent short-time power spectra of each source. A simple scoring scheme based on auditory scene analysis cues is then used to overcome the source ordering problem ultimately allowing each of the independent spectra to be assigned to the correct source. A final stage of adaptive filtering is then applied which forces each of the spectra to become more independent. Each of the sources is then resynthesised using the standard inverse short-time Fourier transform with an overlap add scheme.
https://arrow.dit.ie/argcon/74
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Single Channel Source Separation using Short-time Independent Component Analysis
(2005)
Barry, Dan; Fitzgerald, Derry; Coyle, Eugene; Lawlor, Bob
Single Channel Source Separation using Short-time Independent Component Analysis
(2005)
Barry, Dan; Fitzgerald, Derry; Coyle, Eugene; Lawlor, Bob
Abstract:
In this paper we develop a method for the sound source separation of single channel mixtures usingIndependent Component Analysis within a time -frequency representation of the audio signal. We apply standard Independent Component Analysis techniques to contiguous magnitude frames of the short-time Fourier transform of the mixture.Provided that the amplitude envelopes of each source are sufficiently different, it can be seen that it is possible to recover the independent short-time power spectra of each souce.A simple scoring scheme based on auditory scene analysis cues is then used to overcome the source ordering problem ultimately allowing each of the independent spectra to be assigned to the correct source. A final stage of adaptive filtering is then applied which forces each of the spectra to become more independent. Each of the sources is then resynthesised using the standard inverse short-time Fourier transform with an overlap add scheme.
http://mural.maynoothuniversity.ie/723/
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Single Note Ornaments Transcription for the Irish Tin Whistle Based on Onset Detection
(2004)
Gainza, Mikel; Coyle, Eugene; Lawlor, Robert
Single Note Ornaments Transcription for the Irish Tin Whistle Based on Onset Detection
(2004)
Gainza, Mikel; Coyle, Eugene; Lawlor, Robert
Abstract:
Oranamentation plays a very important role in Irish traditional music giving more expression to the music by altering or embellishing small pieces of a melody. Single-note ornamentation, such as cuts and strikes, are the most common type in Irish traditional music and are played by articulating the note pitch during the onset stage. A technique for transcribing single note ornamentation for the tin whistle is based on onset detection 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 new notes played using single note ornamentation and release
https://arrow.dit.ie/argcon/22
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Single-note Ornementation Transcription for the Irish Tin Whislte based on Onset Detection
(2004)
Gainza, Mikel; Coyle, Eugene; Lawlor, Bob
Single-note Ornementation Transcription for the Irish Tin Whislte based on Onset Detection
(2004)
Gainza, Mikel; Coyle, Eugene; Lawlor, Bob
Abstract:
Ornamentation plays a very important role in Irish Traditional music, giving more expression to the music by altering or embellishing small pieces of a melody. Single-note ornamentation, such as cuts and strikes, are the most common type in Irish Traditional music and are played by articulating the note pitch during the onset stage. A technique for transcribing single note ornamentation for the tin whistle based on onset detection 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 new notes are played using single-note ornamentation start and release.
http://mural.maynoothuniversity.ie/695/
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Smith predictor structure stability analysis using Mikhailov stability criterion
(2005)
Sourdille, Pauline; O'Dwyer, Aidan; Coyle, Eugene
Smith predictor structure stability analysis using Mikhailov stability criterion
(2005)
Sourdille, Pauline; O'Dwyer, Aidan; Coyle, Eugene
Abstract:
As is well known, stability is an important requirement for control systems. Due to the nature of time-delay processes, common methods to evaluate stability may be difficult to use. In 1938, Mikhailov proved a frequency response criterion, which is sufficient and necessary for the stability of processes described by known n-th order constant coefficient linear differential equations. This paper presents the Mikhailov method and the application of this method to a Smith predictor structure controlled by a PI controller.
https://arrow.dit.ie/engscheleart/20
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Sound Source Separation using Shifted Non-negative Tensor Factorisation
(2006)
Coyle, Eugene; Fitzgerald, Derry; Cranitch, Matt
Sound Source Separation using Shifted Non-negative Tensor Factorisation
(2006)
Coyle, Eugene; Fitzgerald, Derry; Cranitch, Matt
Abstract:
Recently, shifted non-negative Matrix Factorisation was developed as a means of separating harmonic instruments from single channel mixtures. However, in many cases two or more channels are available, in which case it would be advantageous to have a multichannel version of the algorithm. To this end, a shifted Non-negative Tensor Factorisation algorithm is derived, which extends shifted Non-negative Matrix Factoristiaon to the multi channel case. The use of this algorithm for multi-channel sound source separation of harmonic instruments is demonstrated. Further, it is shown that the algorithm can be used to perform Non-negative Tensor Deconvolution, to separate sound sources which have time evolving spectra from multi-channel signals.
https://arrow.dit.ie/argcon/6
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Sound Source Separation: Azimuth Discrimination and Resynthesis
(2004)
Barry, Dan; Lawlor, Bob; Coyle, Eugene
Sound Source Separation: Azimuth Discrimination and Resynthesis
(2004)
Barry, Dan; Lawlor, Bob; Coyle, Eugene
Abstract:
In this paper we present a novel sound source separation algorithm which requires no prior knowledge, no learning, assisted or otherwise, and performs the task of separation based purely on azimuth discrimination 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. We use gain scaling and phase cancellation techniques to expose frequency dependent nulls across the azimuth domain, from which source separation and resynthesis is carried out. We present results obtained from real recordings, and show that for musical recordings, the algorithm improves upon the output quality of current source separation schemes.
http://mural.maynoothuniversity.ie/8829/
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Speech-adaptive time-scale modification for computer assisted language learning
(2003)
Donnellan, Olivia; Jung, Elmar; Coyle, Eugene
Speech-adaptive time-scale modification for computer assisted language learning
(2003)
Donnellan, Olivia; Jung, Elmar; Coyle, Eugene
Abstract:
In traditional foreign language learning programmes students are offered a tutor model characterised by slow, deliberate speech. This is insufficient to prepare them to cope with native, colloquial speech. By applying a timescale modification (TSM) algorithm to natural-speed, native speech, students have access to a more desirable, natural speech corpus which permits them to practise essential listening skills in a more focussed manner. This paper presents a method which allows slowing down speech without compromising the quality, pitch or naturalness of the slowed speech by applying different scaling factors to different types of speech segments. The new method is compared to traditional uniform-rate techniques and other variable time-scaling methods. The results show that the proposed approach produces a superior quality output, even for high modification rates.
https://arrow.dit.ie/engscheleart/114
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Structural Segmentation of Irish Traditional Music using Chroma at Set Accented Tone Locations
(2009)
Kelly, Cillian; Gainza, Mikel; Dorran, David; Coyle, Eugene
Structural Segmentation of Irish Traditional Music using Chroma at Set Accented Tone Locations
(2009)
Kelly, Cillian; Gainza, Mikel; Dorran, David; Coyle, Eugene
Abstract:
An approach is presented which provides a structural segmentation of Irish Traditional Music. Chroma information is extracted at certain locations within the music. The resulting chroma vectors are compared to determine similar structural segments. Chroma is only calculated at "set accented tone" locatins within the music. "Set accented tones" are considered to be impervious to melodic variation and are entirely representative of an Irish Traditional tune. Results show that comparing "set accented tones" represented by chroma significantly increases the structural segmentation accuracy that when "set accented tones" are represented by pitch values.
https://arrow.dit.ie/argcon/53
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Structural Segmentation using Set Accented Tones
(2008)
Kelly, Cillian; Gainza, Mikel; Dorran, David; Coyle, Eugene
Structural Segmentation using Set Accented Tones
(2008)
Kelly, Cillian; Gainza, Mikel; Dorran, David; Coyle, Eugene
Abstract:
An approach which efficiently segments Irish Traditional Music into its constituent structural segments is presented. The complexity of the segmentation process is greatly increased due to melodic variation existent within this music type. In order to deal with these variations, a novel method using ‘set accented tones’ is introduced. The premise is that these tones are less susceptible to variation than all other tones. Thus, the location of the accented tones is estimated and pitch information is extracted at these specific locations. Following this, a vector containing the pitch values is used to extract similar patterns using heuristics specific to Irish Traditional Music. The robustness of the approach is evaluated using a set of commercially available Irish Traditional recordings.
https://arrow.dit.ie/argcon/54
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Sub-band Independent Subspace Analysis for Drum Transcription
(2002)
Fitzgerald, Derry; Lawlor, Robert; Coyle, Eugene
Sub-band Independent Subspace Analysis for Drum Transcription
(2002)
Fitzgerald, Derry; Lawlor, Robert; Coyle, Eugene
Abstract:
While Independent Subspace Analysis provides a means of separating sound sources from a single channel signal, making it an effective tool for drum transcription, it does have a number of problems. Not least of these is that the amount of information required to allow separation of sound sources varies from signal to signal. To overcome this indeterminacy and improve the robustness of transcription an extension of Independent Subspace Analysis to include sub-band processing is proposed. The use of this approach is demonstrated by its application in a simple drum transcription algorithm.
https://arrow.dit.ie/argcon/78
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Sub-band Independent Subspace Analysis for Drum Transcription
(2002)
Fitzgerald, Derry; Coyle, Eugene; Lawlor, Bob
Sub-band Independent Subspace Analysis for Drum Transcription
(2002)
Fitzgerald, Derry; Coyle, Eugene; Lawlor, Bob
Abstract:
While Independent Subspace Analysis provides a means of separating sound sources from a single channel signal, making it an effective tool for drum transcription, it does have a number of problems. Not least of these is that the amount of information required to allow separation of sound sources varies from signal to signal. To overcome this indeterminacy and improve the robustness of transcription an extension of Independent Subspace Analysis to include sub-band processing is proposed. The use of this approach is demonstrated by its application in a simple drum transcription algorithm.
http://mural.maynoothuniversity.ie/8828/
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Sustainable Design: A Case Study in Energy Systems
(2009)
Coyle, Eugene; Rebow, Marek
Sustainable Design: A Case Study in Energy Systems
(2009)
Coyle, Eugene; Rebow, Marek
Abstract:
Since the publication of the UN climate report in 2007, most countries now agree that recent climate change has occurred as a result of human intervention and that it will require fast and profound measures to reduce this negative imprint imposed upon nature. Central to this is the need to radically reduce CO2 emissions resulting from combustion of carbon-based energy resources to meet global energy demands. Greater measures must be taken to develop new non-combustion based technologies, in addition to using low-carbon energy resources. Increasing energy efficiency and using energy wisely will also feature in reducing emissions. Sustain-able Energy is now to the fore in both Europe and the United States of America; with government core research agencies developing strategy and preparing scholar-ship research programmes, with invite to develop new ideas and provide innovative solutions to the needs of the energy sector. There is also evidence of greater critical self awareness by aca...
https://arrow.dit.ie/ahfrcbks/1
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Tempo Detection Using a Hybrid Multi-band Approach
(2011)
Gainza, Mikel; Coyle, Eugene
Tempo Detection Using a Hybrid Multi-band Approach
(2011)
Gainza, Mikel; Coyle, Eugene
Abstract:
In this paper, a novel tempo detection system is presented, which suggests the use of a hybrid multiband decomposition. The model tracks the periodicities of different signal property changes that manifest within different frequency bands by using the most appropriate onset/transient detectors for each frequency band. In addition, the proposed system applies a novel method to weight tempo candidates. Each contribution is evaluated by comparing the presented system against existing approaches using three different databases that comprises 1638 songs. These databases include the two publicly available database of songs used in the tempo evaluation contest of ISMIR 2004. These songs are used in order to compare the proposed approach against four recent existing approaches and also against the participants of the tempo detection contest of ISMIR 2004. The results show that the presented approach provides an improvement over existing techniques.
https://arrow.dit.ie/argart/22
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The Application of Multi Frequency Resonant Controllers in in a DFIG to Improve Performance by Reducing Unwanted Power and Torque Pulsations and Reducing Current Harmonics.
(2010)
Kearney, Joseph; Conlon, Michael; Coyle, Eugene
The Application of Multi Frequency Resonant Controllers in in a DFIG to Improve Performance by Reducing Unwanted Power and Torque Pulsations and Reducing Current Harmonics.
(2010)
Kearney, Joseph; Conlon, Michael; Coyle, Eugene
Abstract:
The paper describes a method to control the rotor-side and grid side converters in a DFIG when subjected to the effects of network voltage unbalance conditions. Multi Frequency Resonant Controllers are incorporated into the grid side and rotor side converters to assist in the control functions. The Resonant Controllers are tuned to twice the network frequency to assist in the control of power and torque pulsations and to three times the network frequency to assist in the control of the generated third harmonic currents. A DFIG model is implemented in Matlab/Simulink and simulations show the reduction in power and torque oscillations and a reduction in the 3rd harmonic currents generated as a result of the applied voltage unbalance.
https://arrow.dit.ie/engscheleart/224
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The Application of Multi Frequency Resonant Controllers in in a DFIG to Improve Performance by Reducing Unwanted Power and Torque Pulsations and Reducing Current Harmonics.
(2010)
Kearney, Joseph; Conlon, Michael; Coyle, Eugene
The Application of Multi Frequency Resonant Controllers in in a DFIG to Improve Performance by Reducing Unwanted Power and Torque Pulsations and Reducing Current Harmonics.
(2010)
Kearney, Joseph; Conlon, Michael; Coyle, Eugene
Abstract:
The paper describes a method to control the rotor-side and grid side converters in a DFIG when subjected to the effects of network voltage unbalance conditions. Multi Frequency Resonant Controllers are incorporated into the grid side and rotor side converters to assist in the control functions. The Resonant Controllers are tuned to twice the network frequency to assist in the control of power and torque pulsations and to three times the network frequency to assist in the control of the generated third harmonic currents. A DFIG model is implemented in Matlab/Simulink and simulations show the reduction in power and torque oscillations and a reduction in the 3rd harmonic currents generated as a result of the applied voltage unbalance.
https://arrow.dit.ie/engscheleart/222
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The Control of Rotor Side and Grid Side Converters in a DFIG During Network Voltage Unbalance Conditions Using Resonant Current Controllers.
(2010)
Kearney, Joseph; Conlon, Michael; Coyle, Eugene
The Control of Rotor Side and Grid Side Converters in a DFIG During Network Voltage Unbalance Conditions Using Resonant Current Controllers.
(2010)
Kearney, Joseph; Conlon, Michael; Coyle, Eugene
Abstract:
This paper implements control techniques to enable improved operation of DFIG’s when subjected to the effects of network voltage unbalance conditions. The control scheme involves the integration of a resonant regulator into the PI controllers of both the rotor side and grid side converters in a DFIG. The resonant controller is tuned to twice the network frequency (2ωe) and designed to mitigate against the oscillations in a DFIG due to network voltage unbalance conditions. The grid side converter controller also incorporates a second resonant controller tuned to three times the grid frequency (3ωe) to alleviate the amplitude of the generated third harmonic currents. The control schemes of both the rotor side and grid side converters are coordinated to enable concurrently reductions in both the torque pulsations and the total DFIG power oscillations. A DFIG model is implemented in the program Matlab/Simulink and simulations show the reduction in power and torque oscillations and a red...
https://arrow.dit.ie/engscheleart/223
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The DiTME Project: interdisciplinary research in music technology
(2007)
Coyle, Eugene; Barry, Dan; Gainza, Mikel; Dorran, David; Pritchard, Charles; Feeley, Jo...
The DiTME Project: interdisciplinary research in music technology
(2007)
Coyle, Eugene; Barry, Dan; Gainza, Mikel; Dorran, David; Pritchard, Charles; Feeley, John; Fitzgerald, Derry
Abstract:
This paper profiles the emergence of a significant body of research in audio engineering within the Faculties of Engineering and Applied Arts at Dublin Institute of Technology. Over a period of five years the group has had significant success in completing a Strand 3 research project entitled Digital Tools for Music Education (DiTME).
https://arrow.dit.ie/engscheleart/1
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The Integrated Control of the Rotor Side and Grid Side Converters in a DFIG to Reduce Both Power and Torque Pulsations During Network Voltage Unbalance Conditions.
(2009)
Kearney, Joseph; Conlon, Michael; Coyle, Eugene
The Integrated Control of the Rotor Side and Grid Side Converters in a DFIG to Reduce Both Power and Torque Pulsations During Network Voltage Unbalance Conditions.
(2009)
Kearney, Joseph; Conlon, Michael; Coyle, Eugene
https://arrow.dit.ie/engscheleart/221
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The Presence of Regional Accents in Electrolarynx Speech and the Resultant Effect on Overall Intelligibility.
(2012)
Madden, Brian; Coyle, Eugene
The Presence of Regional Accents in Electrolarynx Speech and the Resultant Effect on Overall Intelligibility.
(2012)
Madden, Brian; Coyle, Eugene
Abstract:
During voiced speech, the larynx provides quasi-periodic acoustic excitation of the vocal tract. In most electrolarynxes, mechanical vibrations are produced by a linear electromechanical actuator, the armature of which percusses against a metal or plastic plate at a frequency within the range of glottal excitation. In this paper, a phonological analysis of a section of results from an online perceptual intelligibility test was performed which compared speech produced using a novel hands-free electrolarynx and a commercially available electrolarynx. A portion of the test consisted of a closed-set format containing a selection of four sets of four random CVC audio samples (recorded by two speakers - 1 male, 1 female - using the Servox™ and the hands-free pager motor design). Each survey participant was requested to listen to every recording and then choose the word they thought most closely resembled the recording in which they heard. The phenomenon referred to as Irish-English, as do...
https://arrow.dit.ie/teapotcon/29
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Time and Pitch Scale Modification: a Real-time Framework and Tutorial
(2008)
Barry, Dan; Dorran, David; Coyle, Eugene
Time and Pitch Scale Modification: a Real-time Framework and Tutorial
(2008)
Barry, Dan; Dorran, David; Coyle, Eugene
Abstract:
A framework is presented which is designed to address the issues related to the real-time implementation of time-scale and pitch scale modification algorithms. This framework can be used as the basis for the developments of applications which allow for a seamless real-time transition between continually varying time scale and pitch-scale parameters which arise as a result of manual or automatic intervention.
https://arrow.dit.ie/argcon/16
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Time Signature Detection by Using a Multi Resolution Audio Similarity Matrix
(2007)
Gainza, Mikel; Coyle, Eugene
Time Signature Detection by Using a Multi Resolution Audio Similarity Matrix
(2007)
Gainza, Mikel; Coyle, Eugene
Abstract:
A method that estimates the time signature of a piece of music is presented. The approach exploits the repetitative structure of most music, where the same musical bar is repeated in different parts of a piece. The method utilised a multi-resolution audio similarity matrix approach, which allows comparisons between longer audio segments (bars) by combining comparisons of shorter segments (fraction of a note). The time signature method only depends on musical structure, and does not depend on the presence of percussive instruments or strong musical accents.
https://arrow.dit.ie/argcon/65
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Time-Scale Modification of Speech Using a Synchronised and Adaptive Overlap-add (SAOLA) Algorithm
(2003)
Dorran, David; Lawlor, Robert; Coyle, Eugene
Time-Scale Modification of Speech Using a Synchronised and Adaptive Overlap-add (SAOLA) Algorithm
(2003)
Dorran, David; Lawlor, Robert; Coyle, Eugene
Abstract:
The synchonised overlap-add (SOLA) algorithm is a commercially popular and considerably researched audio time-scale modification technique. It operates in the time domain and uses a correlation technique to ensure that synthesis frames overlap in a synchronous manner. We present a modification to SOLA that allows the analysis step size adapt to the desired time-scale factor. The synchronised and adaptive overlap-add (SAOLA) alogorithm improves upon the output quality of SOLA for high time-scale factors and reduces the computational requirements for low time-scale factors. However, the computational requirements for high time-scale factors are increased.
https://arrow.dit.ie/argcon/32
Displaying Results 126 - 150 of 164 on page 6 of 7
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