57results about How to "Noise suppression" patented technology

A conference terminal for a digital voice conference system comprises a first sound transducer means, which is implemented to generate a microphone signal from an acoustic signal, a second sound transducer means, which is implemented to generate an acoustic signal from a loudspeaker signal, a connecting means, which is implemented to enable a connection between conference terminal and a conference central unit, to receive a composite conference signal from the conference central unit, and a means for echo suppression, which is implemented to combine the microphone signal or a signal derived therefrom in a noise suppression means with a composite conference signal in a listening operation of the conference terminal, such that a loudspeaker signal results, in which the acoustic signal, on which the microphone signal is based, is reduced. Such a conference terminal allows the suppression of a remote own echo and a remote foreign echo, whereby digital wireless voice conference systems can be realized, which ensure high voice quality and noise immunity with minimum wiring effort.

The invention discloses a remote sensing image change detection method based on controllable kernel regression and superpixel segmentation. The problems that only grey information of an image is considered when a difference chart is structured, other feature information is underused, k-means clustering is directly carried out on the difference chart, and therefore the situation that a weak declension area cannot be detected is easily caused are mainly solved. The method comprises the steps of adopting the controllable kernel regression on two input time phase images to respectively extract structural feature matrixes, combining feature matrixes of neighbourhoods with the structural feature matrixes respectively, obtaining a local structural feature matrix, decomposing the local structural feature matrix by using a non-negative matrix factorization algorithm, carrying out a difference chart structure on an obtained coefficient matrix, finally segmenting the difference chart to obtain an over-segmentation image by using a superpixel segmentation method, carrying out the K-means clustering on the over-segmentation image, and obtaining a change detection result. The remote sensing image change detection method based on the controllable kernel regression and the superpixel segmentation can keep marginal information of images, is good in noise proof performance, improves change detection precision, and can be applied to fields of disaster situation monitoring, land utilization, agricultural investigation and the like.

The invention relates to a vein dynamic characteristic analysis device based on a near-infrared spectrum technique and an analysis method thereof. The vein dynamic characteristic analysis device comprises a static table, a near-infrared camera and two reflecting light sources located above the static table, wherein the reflecting light sources are symmetrically arranged by taking a longitudinal axis of the static table as the axis; a near-infrared transmission light source is arranged right under the static table; the near-infrared camera is arranged right above the static table; the near-infrared camera is connected with a computer and is used for sending a detected image to a data processing unit in the computer; the vein dynamic characteristic analysis is realized through a preset algorithm. According to the invention, the near-infrared reflection and transmission light sources are combined, the suitable optical path design is adopted, a noisy point problem caused by a single transmission light source is effectively solved, and the image contrast and the imaging quality are increased. The vein dynamic characteristic analysis device is safe and non-invasive, low in cost and good in instantaneity. The image enhancing processing is combined with the algorithm, such as frame difference, so that the accurate calculation for the dynamic characteristics can be realized.

The H-bridge circuit consists of first and second switch unit, and first and second linear unit, and is used to impress driving current on motor. The error amplifier generates error signal that presents the difference between command current signal and driving current detected by current detection circuit. The status control circuit simultaneously controls first and second switch unit and feed back circuit. The error signal is selectively impressed on first and second linear unit to make one of them operate at linear mode and other one operate at off state in order to control driving current being in direct proportion to command current signal. The status circuit also controls braking circuit to make error signal convert to braking signal, and first and second linear unit operate at on state mode.

The purpose of the present invention is to provide a heat-diffusing sound insulation sheet provided with excellent sound insulating properties and heat diffusing properties and a heat-diffusing sound insulation structure using the heat-diffusing sound insulation sheet. The heat-diffusing sound insulation sheet is obtained by laminating a heat-diffusing member (16) on a sound-insulating member (15). By disposing same inside an external member such as a casing (2), keyboard (3), etc. of a small electronic device, noise generated from an electronic part (5) or a circuit board (4) on which an electronic part (5) is mounted can be insulated. Moreover, by diffusing the heat generated from the electronic part (5) or the circuit board (4) on which the electronic part (5) is mounted, discomfort due to hot spots generated on the external member can be reduced.

The present invention relates to a PLL circuit and an associated method that allows the PLL circuit to operate at a higher operating frequency with a wider bandwidth and a better out-band noise suppression. The PLL circuit comprises a delay locked loop (DLL), a phase-frequency detector (PFD), a loop filter, a voltage controlled oscillator (VCO) and a frequency divider.

The invention provides a back-illuminated CMOS image sensor and a manufacturing method thereof. The structure such as a bonding pad can be formed through the application of four photomasks, so that the application of the photomasks is reduced; and furthermore, a formed metal gridding is connected with the bonding pad, and comprises a first metal wire positioned in a first isolation groove, a second metal wire positioned in a second isolation groove, and a third metal wire for connecting the bonding pad, the first metal wire and the second metal wire, so that incident light can be preferably limited through the metal gridding, the appearance of crosstalk is avoided, and the quality of the back-illuminated CMOS image sensor is improved. Further, negative pressure is applied onto the bonding pad, so that the negative pressure is also applied onto the metal gridding connected with the bonding pad, namely the negative pressure is applied on a first isolation structure formed in the first isolation groove and a second isolation structure formed in the second isolation groove, and the generation of noisy points and dark current can be inhibited through the negative pressure applied onto the first isolation structure and the second isolation structure.

The invention discloses a light diffusion layer and a light diffusion sheet. The light diffusion layer contains resin and diffusion particles dispersed in the resin, wherein the proportion of the diffusion particles to the solid content of the resin is 0.05: 1 to 3: 1, and the difference between the refractive index of the diffusion particles and the refractive index of the resin is 0.05-1; the particle size of the diffusion particles is 1-30 microns; the thickness of the light diffusion layer is 20-200 microns. According to the invention, the light diffusion layer and the light diffusion sheet can convert a light source into an ideal Lambert light-emitting body, so that the influence of large-angle incident light on a signal can be effectively inhibited.

Power supplier is in use for restraining signal interference generated in electronic equipment caused by fluctuant earth current. The power supplier includes a transformer, a first side circuit, second side circuit, and grounded conductor. Through cascaded a capacitor and an inductor, the method connects the first side circuit and the second side circuit to grounded conductor. Added capacitor can filter out noise and interference in DC and low frequencies components as well as help to maintain representation of lowered electromagnetic interference. Added inductor is in use for getting rid of noise in high frequency and interference. Most part of noise and interference signal is not possible to pass through conduction route formed. The result of the grounded method is that interfere degree is reduced greatly.

The invention relates to a method for improving the decoding rate of a QR code, and the method comprises the following steps: obtaining an image of a frame of QR code, carrying out the searching of aposition detection graph on the image, and recording the number of the position detection graphs and key graph information; if the number of the position detection graphs is greater than or equal to aset value, decoding; the number of the position detection graphs is smaller than a set value, conducting smoothing processing on the image, and conducting position detection graph searching processing on the smoothed image, whether the number of the position detection graphs searched after smoothing processing is larger than or equal to the set value or not is judged, conducting decoding processing if the number of the position detection graphs searched after smoothing processing is larger than or equal to the set value, and otherwise the decoding process is ended; and decoding the QR code according to the found position detection graph and the key graph information, outputting a result if the decoding is successful, judging whether the image is subjected to smoothing processing or not ifthe decoding is failed, if the image is subjected to smoothing processing, ending the decoding process, and if the image is not subjected to smoothing processing, returning to the smoothing processing step.

The invention discloses an audio playing method and device and a storage medium, and belongs to the field of the Internet. The method comprises the steps that when an instruction for playing a targetsound effect mode, a first audio datum and M second audio data are acquired, so that a sound effect feature value of each second audio datum is determined according to the first audio datum. Accordingto the method, the sound effect feature value of each second audio datum is not determined only according to the M second audio data obtained after the sound effect mode is switched and is determinedaccording to the first audio datum and the M second audio data, the condition that great changes are generated between the feature values of the audio data output in the recent period after the soundeffect mode is switched and the feature values of the audio data output in the recent period before the sound effect mode is switched is avoided, and therefore the problem that noise is generated when the sound effect mode is switched is effectively suppressed.

The invention discloses a multilayer printed circuit board comprising a first external circuit layer, a second external circuit layer, a first reference voltage layer, a second reference voltage layerand a high-loss dielectric layer. The first reference voltage layer is arranged between the first external circuit layer and the second external circuit layer. The first reference voltage layer is used for providing a first reference voltage. The second reference voltage layer is arranged between the first reference voltage layer and the second external circuit layer. The second reference voltagelayer is used for providing a second reference voltage. The high-loss dielectric layer is arranged between and adjacent to the first reference voltage layer and the second reference voltage layer tosuppress the noise generated between the first reference voltage layer and the second reference voltage layer. The first reference voltage is different from the second reference voltage.