A hybrid virtual bass system with improved phase vocoder and high efficiency

Shaofei Zhang, Lei Xie, Zhong Hua Fu, Yougen Yuan

科研成果: 书/报告/会议事项章节会议稿件同行评审

1 引用 (Scopus)

摘要

Virtual bass has drawn wide attention from consumer electronics manufacturers who demand good bass quality from small loundspeakers that have no low-frequency capability. Based on the missing fundamental phenomena, virtual bass aims to extend the low frequency bandwidth psychoacoustically by generating a series of harmonics in the mid-frequency range where loudspeakers can reproduce well. State-of-the-art virtual bass systems usually combine the phase vocoder (PV) approach and the non-linear device (NLD) approach, which aims to overcome their individual drawbacks and achieve good bass performance through a hybrid approach. However, these bass enhancement approaches still lack in audio quality and computation efficiency. In this paper, we propose a new hybrid system with an improved phase vocoder and high efficiency. Previous studies show that artificially-added harmonics may change the timbre of the sound tracks and damage audio quality. We solve this problem by a subjective preference based harmonic magnitude control (HMC) in PV, which is motivated by a recent study on the relationship between the audio timbre and the relative intensity of harmonics. We also significantly improve the computation efficiency through a fast transient content detector based on constant-Q transform (CQT), a direct FFT/IFFT implementation of PV and a more efficient mechanism of HMC. Experiments show that the proposed approach is five times faster than a recent hybrid approach [1] and achieves the best bass effect and audio quality.

源语言英语
主期刊名Proceedings of the 9th International Symposium on Chinese Spoken Language Processing, ISCSLP 2014
编辑Minghui Dong, Jianhua Tao, Haizhou Li, Thomas Fang Zheng, Yanfeng Lu
出版商Institute of Electrical and Electronics Engineers Inc.
401-405
页数5
ISBN(电子版)9781479942206
DOI
出版状态已出版 - 24 10月 2014
活动9th International Symposium on Chinese Spoken Language Processing, ISCSLP 2014 - Singapore, 新加坡
期限: 12 9月 201414 9月 2014

出版系列

姓名Proceedings of the 9th International Symposium on Chinese Spoken Language Processing, ISCSLP 2014

会议

会议9th International Symposium on Chinese Spoken Language Processing, ISCSLP 2014
国家/地区新加坡
Singapore
时期12/09/1414/09/14

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