Cochlear implant (CI) patients have difficultyunderstanding tonal languages which use pitchvariations to convey meaning because of poor pitchperception. The ability of CI patients to communicatein noisy environments is severely degraded.Therefore, pitch-detection and (spatial) noisesuppression is of importance to current cochlearimplant devices. This thesis provides the details ofreal-time implementations that address theseconcerns. A pitch-detector was implemented toestimate the pitch and a beamformer was implementedto suppress spatial noise. The pitch-detection andthe beamforming algorithms were implemented on an ARMbased processor of a Personal Digital Assistant(PDA). The pitch-detection algorithm is based on theautocorrelation function. Its real-time performancewas measured and its efficiency in the presence ofspeech-shaped noise and babble noise was evaluated.The beamforming algorithm implemented was theGriffith's beamformer. Objective and subjective testsfor different signal-to-noise ratio levels ofspeech-shaped noise were conducted to evaluate itsperformance. This thesis includes the results ofthese evaluations.
Cochlear implant (CI) patients have difficultyunderstanding tonal languages which use pitchvariations to convey meaning because of poor pitchperception. The ability of CI patients to communicatein noisy environments is severely degraded.Therefore, pitch-detection and (spatial) noisesuppression is of importance to current cochlearimplant devices. This thesis provides the details ofreal-time implementations that address theseconcerns. A pitch-detector was implemented toestimate the pitch and a beamformer was implementedto suppress spatial noise. The pitch-detection andthe beamforming algorithms were implemented on an ARMbased processor of a Personal Digital Assistant(PDA). The pitch-detection algorithm is based on theautocorrelation function. Its real-time performancewas measured and its efficiency in the presence ofspeech-shaped noise and babble noise was evaluated.The beamforming algorithm implemented was theGriffith's beamformer. Objective and subjective testsfor different signal-to-noise ratio levels ofspeech-shaped noise were conducted to evaluate itsperformance. This thesis includes the results ofthese evaluations.
Combines both the DSP principles and real-time implementations and applications, and now updated with the new eZdsp USB Stick, which is very low cost, portable and widely employed at many DSP labs...
High-Level Synthesis for Real-Time Digital Signal Processing is a comprehensive reference work for researchers and practicing ASIC design engineers. It focuses on methods for compiling complex, ...
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