Real-time pitch shifting using a general purpose microcontroller

Buś, Szymon; Jędrzejewski, Konrad

doi:10.1117/12.2281025

Cited by 1 publication

(1 citation statement)

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“…This leads us to look for other cheaper solutions based on microcontrollers such as the STM32F4 card developed by ST Microelectronics. This development board is effective for audio applications as it is proven in the following works [2][3][4]. Indeed, it combines several features such as performance, real-time, low voltage and low power consumption as well as full integration of necessary audio devices such as microphone and audio output.…”

Section: Introductionmentioning

confidence: 99%

Real-Time Implementation of an Optimized Speech Compression System in STM32F4 Discovery Board

Bousselmi

Saoud

Cherif

2019

Smart Innovation, Systems and Technologies

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This paper presents an optimization, and a real-time implementation of a wavelet based speech compression system in STM32F4 discovery card. The optimization is done on the one hand by considering a Voice Activity Detection (VAD) to reduce the complexity and on the other hand by using a new quantization approach that codes each sample with fewer bits. The performance of the embedded audio codec is evaluated with a test technique called Processor-in-the-Loop (PIL) and using objective measures that can predict the perceived quality of the signal, namely SNR, PSNR and MSE. The compression efficiency is measured with the compression factor (CR). This research highlights the importance of the proposed optimizations. Indeed, they increase the CR without damaging the voice quality. The practical study shows that the proposed system meets the temporal and material requirements. Voice clarity is assessed with the Mean Opinion Score (MOS).

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Section: Introductionmentioning

confidence: 99%