Reduction of Audio Noise with Lowpass Chebyshev Type II Filter Simulated using GNU Octave

2019 IEEE 11th International Conference on Humanoid, Nanotechnology, Information Technology, Communication and Control, Environment, and Management ( HNICEM ) Pub Date : 2019-11-01 DOI:10.1109/HNICEM48295.2019.9072844

Justine Clare T. Badajos, King Matthew P. Ochoa, Rex Albert P. Tejadilla, R. T. L. Peñas

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引用次数: 8

Abstract

Audio signal is one of the most used signals especially in the development of communication technology. One common audio signal is a human voice recording. In such signal, there is a segment called unvoiced recording. These segments were usually noise produced in the background or in the device used. This research proposes to simulate the removal of equipment and environmental noise in an audio using Digital Lowpass Chebyshev type II filter. Audio signal samples were gathered using a voice recorder device. The saved file will be filter using GNU Octave software. Then, the processed sound signals are amplified for higher power. The filter designed lowpass filter was expected to attenuate the passband in the frequency of 200 Hz with 10 dB and the stopband in the frequency of 250 Hz, 275 Hz, and 300 Hz with 40 dB. Among the three different specifications of the filter, the filter that has a stopband frequency of 300 Hz exhibits the lowest value of mean and median error.

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低通切比雪夫II型滤波器的降噪研究

音频信号是通信技术发展中应用最为广泛的信号之一。一种常见的音频信号是人的录音。在这样的信号中，有一段被称为无声录音。这些片段通常是在背景或使用的设备中产生的噪声。本研究提出使用数字低通切比雪夫II型滤波器模拟音频中设备和环境噪声的去除。使用录音设备收集音频信号样本。保存的文件将使用GNU Octave软件进行过滤。然后，经过处理的声音信号被放大以获得更高的功率。该滤波器设计的低通滤波器预期对200 Hz频率的通带衰减10 dB，对250 Hz、275 Hz和300 Hz频率的阻带衰减40 dB。在三种不同规格的滤波器中，阻带频率为300 Hz的滤波器的平均误差和中位数误差最小。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

2019 IEEE 11th International Conference on Humanoid, Nanotechnology, Information Technology, Communication and Control, Environment, and Management ( HNICEM )

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