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 21 for “"Vocoder"”.
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Multi-band excitation vocoder
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1987.
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Digital implementation of a frequency-lowering channel vocoder
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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A low cost digital vocoder using linear predictive techniques
… in this thesis develops a low cost digital vocoder based on the principle of linear predictive coding (LPC). This system eliminates many of the complexities which have evolved in LPC vocoders over recent years while preserving good quality speech at low bit rates.<br/><br/>In conventional …
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Advanced Vocoder Idle Slot Exploitation for TIA IS-136 standard
Thesis (S.B. and M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.
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Implementation of a variable rate vocoder and its performance analysis
… a key issue in mobile communications. The use of vocoders reduces the average bit transmission rate for each user, thereby reducing the bandwidth necessary to transmit the speech of each user. Qualcomm-Code Excited Linear Prediction (QCELP) algorithm provides a way to implement a variable rate …
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Physically Informed Subtraction of a String's Resonances from Monophonic, Discretely Attacked Tones : a Phase Vocoder Approach
… in this thesis. Also, the method sits on a Phase Vocoder scheme. This approach has the essential advantage that the subtraction of the partials can take place \instantly", on a frame-by-frame basis, avoiding the necessity of tracking the partials and therefore availing of the possibility of a …
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Children's Perception of Speaker Identity from Spectrally Degraded Input
… children and adults who listened to speech via vocoder simulations of implant processing. Study 1 focused on child implant users' identification of a highly salient speaker—the mother (identified as mother)—and unfamiliar speakers varying in age and gender (identified as man, woman, or girl). In …
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Vector quantization applied to speech coding in the wireless environment
… of the Voice Coding Development and Research (VoCoDeR) System, a software tool for testing and development of new speech coding methods. This tool enables a researcher to build a voice encoder and speech filters, determine an optimal bit allocation scheme, and/or create an error correction …
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Role of F0 in speech reception in the presence of interference : simulating aspects of cochlear-implant processing
… specifically simulating aspects of envelope-vocoder style implant processing. The findings of the studies show that FO encoded via envelope periodicity does not provide a sufficiently salient cue for the segregation of speech. This suggests that the poor speech reception performance of …
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Source and channel coding for low-bandwidth speech communication between optoelectronic devices
… system. A freeware linear predictive vocoder developed by Speex was eventually adopted to compress speech to the bandwidth of the optoelectronic fibers. Several channel coding techniques were examined for an optical channel. This thesis describes the pulse modulation technique …
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A psychoacoustically motivated speech enhancement system
… than Gustafsson's algorithm. As a front end to a vocoder, the new system was preferred over the other two by all the test subjects. Ideas on future work in speech enhancement are also explored.
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Speech Enhancement Using Speech Synthesis Techniques
… Next, we show that using a speech synthesizer (vocoder) we can create a clean resynthesis of the noisy speech for more than one speaker. We term this parametric resynthesis (PR). PR can generate better prosody from noisy speech than a TTS system which uses textual information only. Additionally, …
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An asynchronous,low-power architecture for interleaved neural stimulation, using envelope and phase information
… in noise than traditional envelope-only vocoder simulations of cochlear-implant processing. The average firing rate of the AIS processor was found to be significantly lower than in traditional synchronous stimulators, suggesting that the AIS algorithm and processor can potentially save …
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Speaker Anonymization using End-to-End Zero-Shot Voice Conversion
… by modifying the architecture of a neural vocoder. To the best of our knowledge, this is one of the first end-to-end approaches for zero-shot VC that has ever been proposed. Our model is able to maintain the clarity and intelligibility of transformed speech very well while also achieving …
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Minimum-error, energy-constrained source coding by sensory neurons
… with normal-hearing subjects show that a vocoder simulating this cochlear implant sound coding approach results in better speech perception thresholds when compared to a standard noise vocoder. Although further experiments with cochlear implant users are critical, initial results encourage …
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Statistical Spectral Parameter Estimation of Acoustic Signals with Applications to Byzantine Music
… are implemented. These include: (1) Phase vocoder method, (2) McAulay-Quatieri method, (3) Levinson-Durbin algorithm,(4) YIN, (5) Quinn & Fernandes Estimator, (6) Pisarenko Frequency Estimator, (7) MUltiple SIgnal Characterization (MUSIC) algorithm, (8) Periodogram method, (9) Quinn & …
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Sensor Drive Mobile application for health awareness The SSURE (Software System for User Running Evaluation) app for Android: a design that won’t let you down
… adjusted with the running information, the Phase Vocoder technique was used to transform the sound to different speed without changing the pitch. Its sophisticated frequency-domain sound processing suits our project’s objective. To guide the implementation of these algorithms, several Software …
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Articulatory feature encoding and sensorimotor training for tactually supplemented speech reception by the hearing-impaired
… articulatory information conveyed by an earlier vocoder-type tactile speech display strategy. The novel transduction scheme derives relative amplitude cues from three frequency-filtered speech bands, preserving the cross-channel timing information required for consonant voicing discriminations, …
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Improving Attention-based Sequence-to-sequence Models
… techniques are proposed, such as neural vocoder adaption using attention forcing. The experiments demonstrate that attention forcing improves the overall performance and diversity. It is also demonstrated that deliberation networks improve the overall performance, and reduce the chances …
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The Use of Language Models in End-to-End Spoken Language Processing
… synthesising output speech using a pre-trained vocoder. An incremental beam search is designed to expand the search space of speech token prediction without increasing latency. Experiments on the CVSS speech data showed that SimulS2S-LLM offers a better translation quality-latency trade-off than …
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