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Author = Dorran, David;
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Displaying Results 1 - 25 of 39 on page 1 of 2
Marked
Mark
A Brief Introduction to Speech Synthesis and Voice Modification
(2007)
O'Cinneide, Alan; Dorran, David; Gainza, Mikel
A Brief Introduction to Speech Synthesis and Voice Modification
(2007)
O'Cinneide, Alan; Dorran, David; Gainza, Mikel
Abstract:
For both engineers and linguists, the computer synthesis of natural speech is an objective that would provide many useful applications to human-computer interaction, including the realm of electro-acoustic music. The purpose of this paper is to introduce the area of speech synthesis by providing an overview of the three main methods of computer speech synthesis; namely concatenative, articulatory and formant syntheses. Some aspects of the current state of the technology are illuminated and the final section will explain the author’s motivation and current research approach to the field of voice modification.
https://arrow.dit.ie/argcon/56
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A Comparison of Time-domain Time-scale Modification Algorithms
(2006)
Dorran, David; Lawlor, Robert; Coyle, Eugene
A Comparison of Time-domain Time-scale Modification Algorithms
(2006)
Dorran, David; Lawlor, Robert; Coyle, Eugene
Abstract:
Time-domain appraoches to time-scale modification are popular due to their ability to produce high quality results at a relatively low computational cost. Within the category of time-domain implementations quite a number of alternatives exist, each with their own computational requirements and associated output quality. This paper provides a computational and objective output quality assessment of a number of popular time-domain time-scaling implmentations; thus providing a means for developers to identify a suitable algorithm for their application of interest. In addition, the issues that should be considered in developing time-domain algorithms are outlines, purely in the context of a waveform editing procedure.
https://arrow.dit.ie/argcon/64
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A comparison of time-domain time-scale modification algorithms
(2006)
Dorran, David; Lawlor, Bob; Coyle, Eugene
A comparison of time-domain time-scale modification algorithms
(2006)
Dorran, David; Lawlor, Bob; Coyle, Eugene
Abstract:
Time-domain approaches to time-scale modification are popular due to their ability to produce high quality results at a relatively low computational cost. Within the category of time-domain implementations quite a number of alternatives exist, each with their own computational requirements and associated output quality. This paper provides a computational and objective output quality assessment of a number of popular time-domain time-scaling implementations; thus providing a means for developers to identify a suitable algorithm for their application of interest. In addition, the issues that should be considered in developing time-domain algorithms are outlined, purely in the context of a waveform editing procedure.
http://mural.maynoothuniversity.ie/9712/
Marked
Mark
A Hybrid Time-Frequency Domain approach to Audio time-scale modification.
(2006)
Dorran, David; Lawlor, Bob; Coyle, Eugene
A Hybrid Time-Frequency Domain approach to Audio time-scale modification.
(2006)
Dorran, David; Lawlor, Bob; Coyle, Eugene
Abstract:
Frequency-domain approaches to audio time-scale modification introduce a reverberant/phasy artefact into the time-scaled output. Such artefacts are generally not present within time-domain implementations; however, high quality time-scaling in the time domain is typically limited to quasi-periodic signals such as speech. A hybrid method of time-scaling is presented which draws upon appealing aspects of both time-domain and frequency domain implementations. The technique described can be successfully applied to a wide range of audio and is both robust and efficient. Subjective testing demonstrates that the technique significantly reduces the presence of phasiness.
http://mural.maynoothuniversity.ie/12736/
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A Real-time Framework for Video Time and Pitch Scale Modification
(2008)
Damnjanovic, Ivan; Barry, Dan; Dorran, David; Reiss, Josh
A Real-time Framework for Video Time and Pitch Scale Modification
(2008)
Damnjanovic, Ivan; Barry, Dan; Dorran, David; Reiss, Josh
Abstract:
A framework is presented which addresses the issues related to the real-time implementation of synchronised video and audio time-scale and pitch-scale modification algorithms. It allows for seamless real-time transition between continually varying, independent time-scale and pitch-scale parameters arising as a result of manual or automatic intervention. We illuminate the problems which arise in a real-time context as well as provide novel solutions to prevent artefacts, minimise latency, and improve synchronisation. The time and pitch scaling approach is based on a modified phase vocoder with optional phase locking and an integrated transient detector which enables high quality transient preservation in real-time. A novel method for audio/visual synchronisation was implemented in order to ensure no perceptible latency between audio and video while real-time time scaling and pitch shifting is applied. Evaluation results are reported which demonstrate both high audio quality and minim...
https://arrow.dit.ie/argcon/47
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An Efficient Audio Time-scale Modification Algorithm for use in a Subband Implementation
(2003)
Dorran, David; Lawlor, Robert
An Efficient Audio Time-scale Modification Algorithm for use in a Subband Implementation
(2003)
Dorran, David; Lawlor, Robert
Abstract:
The Paola algorithm, is an efficient algorithm for the time scale modification of speech. It uses a simple peak alignment technique to synchronise synthesis frames and takes waveform properties and the desired time-scale factor into account to determine optimum alogrithm parameters. However, PAOLA has difficulties with certain waveform types and can result in poor synchronisation for subband implementations. SOLA is a less efficient algorithm but resolves the issues associated with PAOLA's implementation. The authors present an algorithm that is a combination of the two approaches that proves to be an efficient and effective algorithm for a subband implementation.
https://arrow.dit.ie/argcon/29
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An Efficient Phasiness Reduction Technique for Moderate Audio Time-scale Modification
(2004)
Dorran, David; Coyle, Eugene; Lawlor, Robert
An Efficient Phasiness Reduction Technique for Moderate Audio Time-scale Modification
(2004)
Dorran, David; Coyle, Eugene; Lawlor, Robert
Abstract:
Phase vocoder approaches to time-scale modification of audio introduce a reverberant/phasy artifact into the time-scaled output due to a loss in phase coherence between short-time Fourier transform (STFT) bins. Recent improvements to the phase vocoder have reduced the presence of this artifact, however, it remains a problem. A method of time-scaling is presented that results in a further reduction in phasiness, for moderate time-scale factors by taking advantage of some flexibility that exists in the choice of phase required so as to maintain horizontal phase coherence between related STFT bins. Furthermore, the approach leads to a reduction in computational load within the range of time-scaling factors for which phasiness is reduced.
https://arrow.dit.ie/argcon/25
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An Efficient Phasiness Reduction Technique for Moderate Audio Time-scale Modification
(2004)
Dorran, David; Coyle, Eugene; Lawlor, Bob
An Efficient Phasiness Reduction Technique for Moderate Audio Time-scale Modification
(2004)
Dorran, David; Coyle, Eugene; Lawlor, Bob
Abstract:
Phase vocoder approaches to timescale modification of audio introduce a reverberant/phasy artifact into the time-scaled output due to a loss in phase coherence between short-time Fourier transform (STFT) bins. Recent improvements to the phase vocoder have reduced the presence of this artifact, however, it remains a problem. A method of time-scaling is presented that results in a further reduction in phasiness, for moderate timescale factors, by taking advantage of some flexibility that exists in the choice of phase required so as to maintain horizontal phase coherence between related STFT bins. Furthermore, the approach leads to a reduction in computational load within the range of time-scaling factors for which phasi-ness is reduced.
http://mural.maynoothuniversity.ie/8831/
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Audio Thumbnail Generation of Irish Traditional Music
(2010)
Kelly, Cillian; Gainza, Mikel; Dorran, David; Coyle, Eugene
Audio Thumbnail Generation of Irish Traditional Music
(2010)
Kelly, Cillian; Gainza, Mikel; Dorran, David; Coyle, Eugene
Abstract:
An approach is presented which generates an audio thumbnail of Irish traditional music. An audio thumbnail is consered to be the most representative segment of the music. For popular music, the chorus is considered to be an ideal audio thumbnail, however in Irish Traditional Music there is no chorus. An Irish Traditional tune consists of tow or mor short structural segments called parts. Parts are repeated to extend the tuen, and the tune itself is also repeated once or more in its entirety. To further extend a performance, tunes are concatenated to form a set of tuens. As a result, there is plenty of repetition within this music type. The presented approach utilises and existing approach which calculates the structure of Irish Traditional Music. The structural informatin is used to extract a single rendition of each distinctive part. The resulting parts are concatenated to form the audio thumbnail.
https://arrow.dit.ie/argcon/48
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Audio Time-Scale Modification
(2005)
Dorran, David
Audio Time-Scale Modification
(2005)
Dorran, David
Abstract:
Audio time-scale modification is an audio effect that alters the duration of an audio signal without affecting its perceived local pitch and timbral characteristics. There are two broad categories of time-scale modifications algorithms, time-domain and frequency-domain. The computationally efficient time-domain techniques produce high quality results for single pitched signals such as speech, but do not cope well with more complex signals such as polyphonic music. The less efficient frequency-domain techniques have proven to be more robust and produce high quality results for a variety of signals; however they introduce a reverberant artefact into the output. This dissertation focuses on incorporating aspects of time-domain techniques into frequency-domain techniques in an attempt to reduce the presence of the reverberant artefact and improve upon computational demands. From a review of prior work it was found that there are a number of time-domain algorithms available and that the ...
https://arrow.dit.ie/engdoc/2
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Audio Time-scale Modification using a Hybrid Time-frequency Domain Approach
(2005)
Dorran, David; Coyle, Eugene; Lawlor, Robert
Audio Time-scale Modification using a Hybrid Time-frequency Domain Approach
(2005)
Dorran, David; Coyle, Eugene; Lawlor, Robert
Abstract:
Frequency-domain approaches to audio time-scale modification introduce a reverberant artefact into the time-scaled output due to a loss in phase coherence between subband components. Whilst techniques have been developed which reduce the presence of this artifact, it remains a source of difficulty. A method of time-scaling is presented that reduces the presence of the reverberation by taking advantage of some flexibility that exists in the choice of phase required so as to maintain horizontal phase coherence along frequency-domain subband components. The approach makes use of appealing aspects of existing time-domain and frequency-domain time-scaling techniques.
https://arrow.dit.ie/argcon/14
Marked
Mark
Audio Time-Scale Modification Using a Hybrid Time-Frequency Domain Approach
(2005)
Dorran, David; Coyle, Eugene; Lawlor, Bob
Audio Time-Scale Modification Using a Hybrid Time-Frequency Domain Approach
(2005)
Dorran, David; Coyle, Eugene; Lawlor, Bob
Abstract:
Frequency-domain approaches to audio time-scale modification introduce a reverberant artifact into the time-scaled output due to a loss in phase coherence between subband components. WHilst techniques have been developed which reduce the presence of this artifact, it remains a source of difficulty. A method of time-scaling is presented that reduces the presence of reverberation by taking advantage of some flexibility that exists in the choice of phase required so as to maintain horizontal phase coherence along frequency-domain subband components. The approach makes use of appearling aspects of existing time-domain and requency-domain time-scaling techniques.
http://mural.maynoothuniversity.ie/652/
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BASICS: Building a System to Ingrain Core Competencies within Students
(2010)
Dorran, David
BASICS: Building a System to Ingrain Core Competencies within Students
(2010)
Dorran, David
Abstract:
The aim of the project is to develop a system which will promote a solid knowledge of programmes’ “core competencies” amongst students. This will be achieved by building a set of online quizzes which students will undertake on a regular basis throughout the delivery of programme modules. Quizzes will include feedback with links to web-based activities/information to help students develop their understanding.
https://arrow.dit.ie/fellow/16
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Characterisation of Cold Plasma Treated Beef and Dairy Lipids Using Spectroscopic and Chromatographic Methods
(2017)
Sarangapani, Chaitanya; Dorran, David; Dunne, Julie; Bourke, Paula; Cullen, Patrick
Characterisation of Cold Plasma Treated Beef and Dairy Lipids Using Spectroscopic and Chromatographic Methods
(2017)
Sarangapani, Chaitanya; Dorran, David; Dunne, Julie; Bourke, Paula; Cullen, Patrick
Abstract:
The efficacy of cold plasma for inactivation of food-borne pathogens in foods is established. However, insights on cold plasma-food interactions in terms of quality effects, particularly for oils and fats, are sparse. This study evaluated plasma-induced lipid oxidation of model matrices, namely dairy and meat fats. Product characterisation was performed using FTIR, 1H NMR and chromatographic techniques. The oxidation of lipids by cold plasma followed the Criegee mechanism and typical oxidation products identified included ozonides, aldehydes (hexanal, pentenal, nonanal and nonenal) and carboxylic acids (9-oxononanoic acid, octanoic acid, nonanoic acid), along with hydroperoxides (9- and 13-hydroperoxy-octadecadienoylglycerol species). However, these oxidation products were only identified following extended treatment times of 30 min and were also a function of applied voltage level. Understanding cold plasma interactions with food lipids and the critical parameters governing lipid o...
https://arrow.dit.ie/schfsehart/227
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Convergence in Human Dialogues Time Series Analysis of Acoustic Feature
(2009)
Kousidis, Spyros; Dorran, David; Mcdonnell, Ciaran; Coyle, Eugene
Convergence in Human Dialogues Time Series Analysis of Acoustic Feature
(2009)
Kousidis, Spyros; Dorran, David; Mcdonnell, Ciaran; Coyle, Eugene
Abstract:
Convergence of acoustic/prosodic (a/p) features between two speakers is a well-known property of human dialogue. It has been suggested that this particular aspect of human interaction should be implemented in spoken dialogue systems, so that they can be perceived as more “humanlike”. This paper presents a quantitative analysis method that can provide information required for modeling the phenomenon of convergence. The analysis is a combination of TAMA, a previously introduced data extraction method, and bivariate time series analysis. Results show significant correlation of a/p features between speaker dyads in the recorded dialogues analyzed, and indicate a significant,amount of feedback, which a statistical verification of bidirectional convergence.
https://arrow.dit.ie/dmccon/2
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Digital Signal Processing Foundations
(2015)
Dorran, David
Digital Signal Processing Foundations
(2015)
Dorran, David
Abstract:
Signals are all around us and come in a wide variety of shapes and forms. When we speak we create pressure variations in the air which generate audio signals; earthquakes produce large seismic signals; healthcare professionals monitor ECG signals which capture the electrical activity of the heart; radio, internet and telephone signals are being transmitted across the world; the list of signals is endless! (see 2 minute video at pzdsp.com/vid1 for some examples) Digital signal processing (DSP) is primarily about making use of computers to help us analyse and manipulate signals in order to help us with our everyday lives. To get a flavour of where DSP is being used check out the lists below; it really is a key component in many innovative solutions and products in recent times
https://arrow.dit.ie/engschelecon/11
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Exploiting Glottal Formant Parameters for Glottal Inverse Filtering and Parameterization
(2010)
O'Cinneide, Alan; Dorran, David; Gainza, Mikel; Coyle, Eugene
Exploiting Glottal Formant Parameters for Glottal Inverse Filtering and Parameterization
(2010)
O'Cinneide, Alan; Dorran, David; Gainza, Mikel; Coyle, Eugene
Abstract:
It is crucial for many methods of inverse filtering that the time domain information of the glottal source waveform is known, e.g. the location of the instant of glottal closure. It is often the case that this information is unknown and/or cannot be determined due to e.g. recording conditions which can corrupt the phase spectrum. In these scenarios, alternative strategies are required. This paper describes a method which, given the parameters of the glottal formant of the signal frame, can accurately parameterize the glottal shape source and vocal filter for a broad range of voice quality types and which is robust to the corruption of the phase spectrum. Index Terms: glottal inverse filtering, frequency domain, glottal models, glottal formant
https://arrow.dit.ie/argcon/51
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High Auality Time-scale Modification of Speech using a Peak Alignment Overlap-add Alogroithm (PAOLA)
(2003)
Dorran, David; Lawlor, Robert; Coyle, Eugene
High Auality Time-scale Modification of Speech using a Peak Alignment Overlap-add Alogroithm (PAOLA)
(2003)
Dorran, David; Lawlor, Robert; Coyle, Eugene
Abstract:
The duration of a speech passage can be altered using audio time-scale modification techniques. Time-scale modification can be achieved in the time domain by segmenting the input signal into overlapping frames and recombining the frames with an overlap differing from the analysis overlap. We present a time-scale modification algorithm that uses a simple peak alignment technique to synchronise overlapping synthesis frames. The peak alignment overlap-add (Paola) algorithm also takes advantage of waveform properties to ensure a high quality output for the minimum number of iterations. The new algorithm produces a time-scaled output of approximately equal quality to that of an adaptive implementation of the commercially popular synchonised overlap-add (SOLA) algorithm, but offers a computational saving ranging from a factor of 15 (for a time-scale factor of 0.5) to 170 (for a time-scale factor of 1.1)
https://arrow.dit.ie/argcon/34
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High quality time-scale modification of speech using a peak alignment overlap-add algorithm (PAOLA)
(2003)
Dorran, David; Lawlor, Bob; Coyle, Eugene
High quality time-scale modification of speech using a peak alignment overlap-add algorithm (PAOLA)
(2003)
Dorran, David; Lawlor, Bob; Coyle, Eugene
Abstract:
The duration of a speech passage can be altered using audio time-scale modification techniques. Time-scale modification can be achieved in the time domain by segmenting the input signal into overlapping frames and recombining the frames with an overlap differing from the analysis overlap. We present a time-scale modification algorithm that uses a simple peak alignment technique to synchronize overlapping synthesis frames. The peak alignment overlap-add (PAOLA) algorithm also takes advantage of waveform properties to ensure a high quality output for the minimum number of iterations. The new algorithm produces a time-scaled output of approximately equal quality to that of an adaptive implementation of the commercially popular synchronised overlap-add (SOLA) algorithm, but offers a computational saving ranging from a factor of 15 (for a time-scale factor of 0.5) to 170 (for a time-scale factor of 1.1).
http://mural.maynoothuniversity.ie/8791/
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Linear Prediction: The Problem, its Solution and Application to Speech
(2008)
O'Cinneide, Alan; Dorran, David; Gainza, Mikel
Linear Prediction: The Problem, its Solution and Application to Speech
(2008)
O'Cinneide, Alan; Dorran, David; Gainza, Mikel
Abstract:
Linear prediction is a signal processing technique that is used extensively in the analysis of speech signals and, as it is so heavily referred to in speech processing literature, a certain level of familiarity with the topic is typically required by all speech processing engineers. This paper aims to provide a well-rounded introduction to linear prediction, and so doing, facilitate the understanding of the technique. Linear prediction and its mathematical derivation will be described, with a specific focus on applying the technique to speech signals. It is noted, however, that although progress in linear prediction has been driven primarily by speech research, it involves concepts that prove useful to digital signal processing in general.
https://arrow.dit.ie/argcon/58
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Locating Tune Changes and Providing a Semantic Labelling of Sets of Irish Traditional Tunes
(2010)
Kelly, Cillian; Gainza, Mikel; Dorran, David; Coyle, Eugene
Locating Tune Changes and Providing a Semantic Labelling of Sets of Irish Traditional Tunes
(2010)
Kelly, Cillian; Gainza, Mikel; Dorran, David; Coyle, Eugene
Abstract:
An approach is presented which provides the tune change loactions within a set of Irish traditional turnes. Also provided are semantic labels for each part of each tune within the set. A set in Irish traditional music is a number of individual tunes played segue. Each of the tunes in the set are made up of structural segments called parts. Musical variation is a prominent characteristic of this genre. However, a certain set of notes known as "set accented tones" are considered impervious to musical variation. Chroma information is extracted at "set accented tone" locations within the music. The resulting chroma vectors are grouped to represent the parts of the music. The parts are then compared with one another to form a part similarity matrix. Unit kernels which represent the possible structures of an Irish traditional tuens are matched with the part similarity matrix to determine the tune change locations and semantic part labels.
https://arrow.dit.ie/argcon/49
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Monitoring Convergence of Temporal Features in Spontaneous Dialogue Speech
(2009)
Kousidis, Spyros; Dorran, David
Monitoring Convergence of Temporal Features in Spontaneous Dialogue Speech
(2009)
Kousidis, Spyros; Dorran, David
Abstract:
This paper presents ongoing research on convergence of speech features in human dialogues, in view of simulating this behaviour in spoken dialogue systems. The TAMA method (time-aligned moving average), previously used on monitoring convergence of acoustic prosodic (a/p) features, is applied to temporal properties of speech (between-turn pauses and overlaps). The results are compared to those of an older study on the same features.
https://arrow.dit.ie/dmccon/1
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Multi-Channel Audio Time-Scale Modification
(2005)
Dorran, David; Lawlor, Bob; Coyle, Eugene
Multi-Channel Audio Time-Scale Modification
(2005)
Dorran, David; Lawlor, Bob; Coyle, Eugene
Abstract:
Phase vecoder based approaches to audio time-scale modification introduce a reverberant artefact into the time scaled output. Recent techniques have been developed to reduce the presence of this artefact; however, these techniques have the effect of introducing additional issues relating to their application to multi-channel recordings. This paper addresses these issues by collectively analysing all channels prior to time-scaling each individual channel.
http://mural.maynoothuniversity.ie/8793/
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Multi-channel Audio Time-scale Modification
(2005)
Dorran, David; Lawlor, Robert; Coyle, Eugene
Multi-channel Audio Time-scale Modification
(2005)
Dorran, David; Lawlor, Robert; Coyle, Eugene
Abstract:
Phase vecoder based approaches to audio time-scale modification introduce a reverberant artefact into the time scaled output. Recent techniques have been developed to reduce the presence of this artefact; however, these techniques have the effect of introducing additional issues relating to their application to multi-channel recordings. This paper addresses these issues by collectively analysing all channels prior to time-scaling each individual channel.
https://arrow.dit.ie/argcon/66
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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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