Acquirement and enhancement of remote speech signals

Lü, Tao; Guo, Jin; Zhang, Heyong; Yan, Chun-Hui; Wang, Canjin

doi:10.1007/s11801-017-7059-9

Cited by 9 publications

(1 citation statement)

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“…This is why conventional methods cannot really be applied to the speech acquired by LDV if the irradiated object is unknown. A few speech enhancement methods specifically for LDV have been proposed [13,14,16]. For example, Li et al developed a method of first using a band-pass filter to filter out the noise in the non-voice frequency band of the acquired speech and then using a Wiener filter to reduce the noise of the speech signal [13].…”

Section: Introductionmentioning

confidence: 99%

Speech Enhancement for Laser Doppler Vibrometer Dealing with Unknown Irradiated Objects

Cai

Iwai

Nishiura

2023

IEICE Trans. Fundamentals

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The acquisition of distant sound has always been a hot research topic. Since sound is caused by vibration, one of the best methods for measuring distant sound is to use a laser Doppler vibrometer (LDV). This laser has high directivity, that enables it to acquire sound from far away, which is of great practical use for disaster relief and other situations. However, due to the vibration characteristics of the irradiated object itself and the reflectivity of its surface (or other reasons), the acquired sound is often lacking frequency components in certain frequency bands and is mixed with obvious noise. Therefore, when using LDV to acquire distant speech, if we want to recognize the actual content of the speech, it is necessary to enhance the acquired speech signal in some way. Conventional speech enhancement methods are not generally applicable due to the various types of degradation in observed speech. Moreover, while several speech enhancement methods for LDV have been proposed, they are only effective when the irradiated object is known. In this paper, we present a speech enhancement method for LDV that can deal with unknown irradiated objects. The proposed method is composed of noise reduction, pitch detection, power spectrum envelope estimation, power spectrum reconstruction, and phase estimation. Experimental results demonstrate the effectiveness of our method for enhancing the acquired speech with unknown irradiated objects.

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Section: Introductionmentioning

confidence: 99%