Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 42 for “"audio signals"”.
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Adaptive watermarking algorithms for MP3 compressed audio signals
… into digital contents such as image, movie and audio data. Once a watermark is embedded into the original MP3 signal, it can be used to identify the copyright holder in order to prevent illegal copy and to verify the modification from the original content. This thesis presents two novel adaptive …
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A wavelet-based technique for reducing noise in audio signals
… the specific application of reducing noise in audio signals examined. Within the context of this application, considerations unique to wavelet analysis are revealed and trade-offs analyzed. Finally, the results obtained from implementing the noise reduction system are presented and extensions …
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Nonuniform subbard coding of high quality audio signals employing frequency warping
… area of subband coding of high quality digital audio signals. The research into the application of a nonuniform filter bank employing frequency warping to digital audio coding is described. Firstly, some aspects of psychoacoustics, especially masking effects, are studied. Utilising …
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Indoor human activites recognition using audio signals based on support vector machines and convolutional neural networks
… about environmental sounds (door bells, alarm signals, etc.). This thesis will present two approaches using audio signal processing: support vector machines method and convolutional neutral networks method. In both methods, audio feature extraction is needed since the original audio signal …
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Digital encoding of speech and audio signals based on the perceptual requirements of the auditory system
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1979.
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Sinusoids, noise and transients: spectral analysis, feature detection and real-time transformations of audio signals for musical applications
… for real-time transformations of musical audio signals using sinusoidal models. Four open-source software libraries were developed with the goal of providing real-time spectral synthesis by analysis tools for composers, musicians, researchers and audio signal processing developers. The …
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An Application of Spectral Translation and Spectral Envelope Extrapolation for High-frequency Bandwidth Extension of Generic Audio Signals
… for blind high-frequency bandwidth extension of audio signals, a means of improving perceptual quality for sound which has been previously low-pass filtered or downsampled (typically due to storage considerations). The algorithm combines an application of the modulation theorem for discrete …
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Effect of music by Mozart and sounds claiming to contain beta-frequency enhancing audio signals on backward digit span recall
… through increasing beta waves has been used in audio technology that claims to increase beta waves through sound. The idea that sound or music can increase a person's attention, and thus cognitive abilities, is not new. In 1993, Rauscher, Shaw, and Ky reported that listening to Mozart resulted …
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Bayesian approaches to time-frequency inverse problems
… physical media such as gas, liquid or solid, audio signals are better defined and understood by the way their spectral composition evolves over time. Characterising the dynamics of these hidden spectral components—rather than their raw waveform—is crucial in a wide range of practical …
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Η ΧΡΗΣΗ ΤΗΣ ΔΙΑΜΟΡΦΩΣΗΣ Δ-Σ ΣΤΗ ΦΑΣΜΑΤΙΚΗ ΑΝΑΛΥΣΗ ΣΗΜΑΤΩΝ
… TO VERY SIMPLE CIRCUITRY SPECTRUM ANALYZERS FOR AUDIO SIGNALS. TWO SPECTRUM ANALYZERS ARE PROPOSED: A HYBRID AND A DIGITAL ONE. IN THE FORMER SOME OPERATIONS ARE REALIZED BY ANALOG AND SOME OTHERS BY DIGITAL METHODS, WHILE IN THE LATTER ALL THE OPERATIONS ARE DIGITALLY PERFORMED. THE ANALYZERS …
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Objective assessment of audio quality using an auditory processing model
… evaluation of quality differences between audio signals is presented. The core of this method is the computer model of the "effective" signal processing in the auditory system by Dau et al. (1997) which is employed to transform acoustic signals that are be compared, into corresponding …
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Deciphering Emotional Responses to Music: A Fusion of Psychophysiological Data Analysis and Bi-LSTM Predictive Modeling
… of emotional attributes with EDA and POX signals as input. To further facilitate a comprehensive visualization and analysis of the EDA, POX, and audio signals, we developed a dedicated platform, which features a coordinated multiple view interface, as an integral part of this work.
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Music Visualization Using Source Separated Stereophonic Music
… are a popular way to represent information from audio signals through computer graphics. Visualization can help people better understand music and its complex and interacting elements. This music visualization system extracts pitch, panning, and loudness features from source separated audio files …
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System-images
… information in the form of visual cues, numbers, audio signals, colors, interaction time, computational identity and location are enough to coordinate an imprint of user and societal behavior. If collated, what kinds of narratives, philosophies and aesthetics would this data generate? …
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High Resolution Acoustic Measurements of Musical Instruments
… for post-processing of recorded data to obtain signals from ‘virtual’ microphones. The project is discussed along with a rationale for the particular test and measurement procedure used in this research and is followed by a literature review outlining both historical and current research and …
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Bayes meets Bach: applications of Bayesian statistics to audio restoration
Memoryless nonlinear distortion can be present in audio signals, from recording to reproduction: bad quality or amateurishly operated equipments, physically degraded media and low quality reproducing devices are some examples where nonlinearities can naturally appear. Another quite common defect in …
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Overlapped speech and music segmentation using singular spectrum analysis and random forests
… broadcasting, and semantic web have emerged, audio information mining and automated metadata generation have received much attention. Manual indexing and metadata tagging are time-consuming and subject to the biases of individual workers. An automated architecture able to extract information …
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Machine-Learning-Based Non-Destructive Evaluation of Refractory Anchor Welds via Analysis of Percussion-Induced Acoustic Signals
… machine learning (ML) and percussion-induced audio analysis to assess weld quality. A custom weld plate was fabricated containing both properly welded and intentionally flawed refractory anchors. Controlled mechanical impacts—using tools such as a hammer and chisel—were applied to the exposed …
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Study of the audio coding algorithm of the MPEG-4 AAC standard and comparison among implementations of modules of the algorithm
Audio coding is used to compress digital audio signals, thereby reducing the amount of bits needed to transmit or to store an audio signal. This is useful when network bandwidth or storage capacity is very limited. Audio compression algorithms are based on an encoding and decoding process. In the …
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