Topic
Noise measurement
About: Noise measurement is a research topic. Over the lifetime, 19776 publications have been published within this topic receiving 308180 citations.
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TL;DR: In this paper, a physics-based dipole moment source reconstruction was proposed to estimate the near-field coupling between a liquid crystal display panel to a cellphone's cellular antenna, based on the understanding of the current distribution on the source.
Abstract: A physics-based dipole moment source reconstruction is proposed to estimate the near-field coupling between a liquid crystal display panel to a cellphone's cellular antenna. Based on the understanding of the current distribution on the source, a magnetic dipole moment source is reconstructed to replace the real radiation source that is located at the edge of the flexible printed circuit board. To characterize the coupling from the equivalent dipole moment source to the victim antenna, the noise transfer coefficient is proposed. The noise transfer coefficient can be calculated from the near-field scanning and the direct coupling measurements using a wideband source. The proposed physics-based dipole moment source reconstruction and noise transfer coefficient are successfully validated through the measured near-field coupling in a practical cellphone.
61 citations
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TL;DR: Assessment of patients' and staff's perceptions of noise levels and sources in the hospital environment and interventions to reduce the noise level significantly reduced noise as perceived by patients and staff.
Abstract: Noise has been shown to interfere with the healing process and can disrupt the patient's experience. This study assessed patients' and staff's perceptions of noise levels and sources in the hospital environment and identified interventions to reduce the noise level. The interventions significantly reduced noise as perceived by patients and staff. Identification of a structured process to identify noise sources and standardization of noise measurement methods can improve the patient hospital experience.
61 citations
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TL;DR: Noise variations are tracked during an utterance by means of an adaptive version of the normalized noise energy method, which allows defining the varying optimal time window length for noise retrieval, avoiding empty "dip" regions.
Abstract: For pathological voices, spectral noise is closely related to the degree of perceived hoarseness. In this paper, noise variations are tracked during an utterance by means of an adaptive version of the normalized noise energy method (H. Kasuya et al., J. Acoust. Soc. Amer., vol. 80, no. 5, p. 1329-34, 1986). A first step is devoted to pitch estimation, which allows defining the varying optimal time window length for noise retrieval, avoiding empty "dip" regions. The approach Is tested on synthetic data and applied to real data coming from cordectomised adult male patients.
61 citations
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18 Dec 2006TL;DR: In this article, phase shifting in audio signals is introduced to reduce the correlation with PN signal per sub-band, which allows easy detection of the embedded data signal from audio when de-spreading the compound signal.
Abstract: This paper presents an improvement of spread spectrum audio data hiding methods. We introduce phase shifting in audio signals to reduce the correlation with PN signal per each sub-band. It allows easy detection of the embedded data signal from audio when de-spreading the compound signal. The paper reports the subjective test results and the measurements of noise resiliency. The proposed method generates the quality degradation at the same level of NMR +3dB, but accests +6dB noise, therefore, the method has 3dB benefits.
61 citations
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TL;DR: Two methods based on a generalized likelihood ratio test (GLRT) and the dynamic Allan variance (DAVAR) are proposed, which efficiently track variations in the experimental clock data and appear as suitable tools for the detection of atomic clock anomalies.
Abstract: In this paper, the problem of identifying variations in the nature of atomic clock noise is addressed. Two methods are proposed. One method is based on a generalized likelihood ratio test (GLRT), and the other is based on the dynamic Allan variance (DAVAR), which is a representation of the instantaneous clock stability that is able to point out possible nonstationary behaviors. Both methods efficiently track variations in the experimental clock data and, thus, appear as suitable tools for the detection of atomic clock anomalies
61 citations