6results about How to "Reduce background noise" patented technology

A microphone noise reduction circuit and a conference microphone are disclosed. The noise reduction circuit includes a decoding unit, a DSP unit, and a microphone array. The output terminal of the decoding unit is connected to a first terminal of the DSP unit, and the microphone array is connected to a second terminal of the DSP unit. The microphone array is used to collect audio data, the DSP unit is used to reduce noise in the audio data and output the noise-reduced audio signal, and the decoding unit is used to decode or encode the noise-reduced call audio signal. This embodiment of the invention, by combining a microphone array, a DSP unit, and a decoding unit, effectively reduces background noise and echo interference, improves the clarity and recognition accuracy of the audio signal, and significantly improves the audio processing quality.

The invention relates to a training method, an audio-visual segmentation method, an electronic device and a storage medium, and the method comprises the steps: obtaining a training sample which comprises an audio signal, an image, a target semantic tag and a segmentation tag; extracting audio features and image features, and performing self-attention enhancement on the audio features based on the target semantic tag to apply target semantic consistency constraint to obtain enhanced audio features; performing cross attention reweighting on the unenhanced audio features based on the guidance of the enhanced audio features to obtain target pointing audio features; bidirectional interactive fusion is executed based on the image features and the target pointing audio features, and a sparse self-attention network is adopted in the image feature fusion process to suppress unmatched image region response; generating a segmentation prediction result based on the fused image features and audio features, and training to obtain an audiovisual segmentation model; and inputting a to-be-processed video into the trained audio-visual segmentation model, and outputting a segmentation result. The image segmentation accuracy of the sounding target can be improved.

This invention discloses a probe for detecting Ox-LDL and its applications, belonging to the field of Ox-LDL detection technology. This invention provides a variety of probe molecules that can specifically and sensitively recognize Ox-LDL and effectively distinguish between high-density lipoprotein (HDL), low-density lipoprotein (LDL), and Ox-LDL. The probe exhibits significantly enhanced fluorescence in the presence of Ox-LDL, while showing almost no fluorescence in pure PBS solution, with low background noise. The probe of this invention is a molecular probe, simple to prepare, stable, easy to store and detect, and can be used as a reagent for detecting Ox-LDL in peripheral blood, cells, and tissues, a lipoprotein identification reagent, an early diagnostic reagent for atherosclerosis, and an early diagnostic reagent for fatty liver.

This application discloses a single-source energy spectrum imaging device, relating to the field of medical technology. The method includes a radiation source, a detector assembly, and a grating assembly. Both the detector assembly and the grating assembly are positioned along the emission direction of the radiation source. The detector assembly is used to simultaneously acquire at least two types of radiation image signals during a single exposure of the radiation source, with the at least two types of radiation image signals corresponding to different energy ranges. The grating assembly is located between the radiation source and the detector assembly. The grating assembly includes an enhanced anti-scattering grating with a micro-aperture array for allowing radiation to pass through. The enhanced anti-scattering grating includes a blocking layer and an absorption layer, with the absorption layer compositely disposed on the surface of the blocking layer, absorbing the characteristic radiation generated by the blocking layer. This application solves the technical problem in existing single-source, single-exposure dual-energy imaging where scattered radiation easily contaminates the detector signal, leading to distortion of the energy spectrum data and severe image artifacts.

The application belongs to the field of fluorescent probes, and discloses a kind of fluorescent probe for monitoring dynamic change of hydrogen peroxide in different subcellular organelles, preparation method and application thereof, the probe is with flavonol as parent nucleus, and hydrogen peroxide ratio type fluorescent probe PML is targeted to lysosome, and hydrogen peroxide ratio type fluorescent probe PZD is targeted to lipid droplet.The application also provides the preparation method and application of the probe.The probe provided by the application has novel structure, simple synthesis method, good recognition effect on hydrogen peroxide, especially hydrogen peroxide in subcellular organelles, fast response speed, high sensitivity, reliable inspection result, good biocompatibility, subcellular organelle positioning function, so that they can be used for monitoring hydrogen peroxide in intracellular microenvironment, and it has great significance to apply probe technology to practical related pathological model to develop the mechanism of hydrogen peroxide in its pathology, especially in the process of ferroptosis.