语音增强和语音识别系列博文 波束形成 beamforming 体现的是声源信号的空域选择性,许多传统波束形成方法具有线性处理结构;波束形成需要考虑三个方面: 1.麦克风阵列个数;2.性能; 3.鲁棒性 在麦克风较少时,波束形成的空域选择性差,当麦克风数量较多时,其波束3dB带宽较为窄,如果估计的目标声源方向有稍有偏差,带来的影响...
BeamformerBreast cancerConfocal imagingMedical microwave imagingWeighted-delay-and-sumMany similarities exist between ultrasound and microwave imaging, however, ultrasound is typically performed with a handheld transducer whereas antennas are placed around the subject of imaging for microwave breast imaging. ...
A new acoustic leak detection system for sodium-cooled reactor steam generators using a delay-andsum beamformer is proposed. The major advantage of the delay-and-sum beamformer is that it could provide information on the acoustic source direction. An acoustic source of a sodium-water reaction ...
A novel adaptive beamformer named filtered-delay multiply and sum (F-DMAS) has recently been proposed. Compared to the delay and sum (DAS) beamforming algorithm, F-DMAS can efficiently improve the resolution and contrast. However, the DAS can still be seen in the expansion of DMAS. Therefore...
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TheTime Delay Beamformerblock performs delay-and-sum beamforming. Plane-wave signals arriving at the array elements are time-aligned and then summed. Time alignment is achieved by transforming the signals into the frequency domain and applying linear phase shifts corresponding to a time delay. The...
Currently, the nonadaptive delay-and-sum (DAS) beamformer is extensively used for ultrasound imaging, despite the fact that it has lower resolution and worse interference suppression capability than the adaptive standard Capon beamformer (SCB) if the steering vector corresponding to the signal of int...
Optical BEAMTAP beam-forming and jammer-nulling system for broadband phased-array antennas. while still providing the full NM degrees of freedom of a conventional N-element time-delay-and-sum beam former that requires N tapped delay lines with... Kriehn,Kiruluta,P E,... - 《Applied Optics...
H = phased.TimeDelayBeamformer creates a time delay beamformer System object, H. The object performs delay and sum beamforming on the received signal using time delays. H = phased.TimeDelayBeamformer(Name,Value) creates a time delay beamformer object, H, with each specified property Name set...
Short-lag filtered-delay multiply and sum beamformer combined with sign coherence factor in ultrasound imaging A short-lag filtered-delay multiply and sum (FDMAS) beamforming algorithm, which can be considered as a variant of F-DMAS, has recently been proposed. In t... K Song,J Zhan,P Li...