71 results about "Noise band" patented technology

There is disclosed a noise suppression device capable of improving the noise suppression accuracy while reducing the audio distortion. In this device, a suppression unit suppresses a noise component from the audio power spectrum by using the detection result of the audio-existing band and the noise band in the audio power spectrum including the noise component. A pitch harmonic structure extracting unit (105) extracts a pitch harmonic power spectrum from the audio power spectrum. An audio-existence judgment unit (106) judges whether the audio power spectrum has audio existence according to the extracted pitch harmonic power spectrum. A pitchharmonic structure repair unit (108) repairs the extracted pitch harmonic power spectrum. A per-band audio / noise correction unit (109) corrects the detection result according to the pitch harmonic power spectrum selected according to the result of judgment by the audio-existence judgment unit (106) among the repaired pitch harmonic power spectrum and the extracted pitch harmonic power spectrum.

The invention provides an imaging device, voice process circuit, noise reducing circuit, noise reducing method and program. The noise reducing circuit includes: a de-noising unit configured to eliminate a noise band from an input voice signal; a noise recognizing unit configured to recognize noise included in the voice signal; a de-noising period generating unit configured to generate a signal indicating a de-noising period in accordance with an occurrence period of the recognized noise; and a selecting unit configured to select an output of the de-noising unit when the de-noising period is indicated and select the voice signal when the de-noising period is not indicated.

The invention discloses a lightweight combined-type plate structure used for low-frequency noise insulation. The lightweight combined-type plate structure is composed of a noise insulation substrate, beam piece units and supporting members. The beam piece units are fixedly connected on the noise insulation substrate through the supporting members, each beam piece unit comprises at least one cuboid-structured beam piece, and central points of the beam pieces are fixedly connected with the corresponding supporting members; the minimum order resonance frequency of one beam piece is identical with one target noise frequency. The design method includes the steps 1), respectively determining design parameters according to number of target noise bands; 2), determining a structural parameter of the noise insulation substrate; 3), when determining periodic spacing a, selecting the same within the range of 0<a<lambada; 4), determining structural parameters of the beam piece units, wherein the structural parameters include the number of the beam pieces and the thickness hr, the length lr and the width br of each beam piece; according to the number of the target noise frequencies, obtaining the number of the beam pieces in one-to-one correspondence to the number of the target noise frequency, and according to actual engineering requirements, respectively selecting the thickness hr of different beam pieces and calculating to determine the length lr and the width br of each beam piece.

A method and system for tracking and updating bias in an inertial sensor by determining a maximum bias drift and a noise band for a sensor, determining a prior bias value of the sensor, and measuring a current bias value of the sensor. The method and system can further include calculating a bias difference between the prior bias value and the current bias value, and updating the prior bias value with the current bias value if the current bias value is within the noise band and the bias difference is less than or equal to the maximum bias drift.

A low-phase noise voltage control oscillator (VCO) comprising a voltage source for supplying control voltage to the VCO core; a phase lock loop, having an output connected to an input of the voltage source; a VCO core, including an amplifier circuit with noiseless biasing and a tank circuit with noiseless biasing of the varactors; having an output connected to an input of the phase lock loop; and an attenuator, located between the voltage source and the VCO core, for reducing phase noise from the voltage source to the VCO core.

Cylindrical tunnel type underwater multi-phase jet noise reduction device, including a tubular shell, the outer wall of which has four through holes in the circumferential direction, a tapered nozzle is fixed inside the shell, the front end of the tapered nozzle is an annular orifice plate, the middle part It is a cylindrical section, and the rear end is a tapering nozzle. Four through holes are opened in the circumferential direction of the outer wall of the cylindrical section. The cross-section is tangent; the annular orifice plate is connected with the front nozzle, the inner conduit is fixed on the inner wall of the tapered nozzle on the axis of the shell, the front part of the inner conduit is provided with blades, and a porous nozzle is fixed on the inner wall of the outlet end of the inner conduit . The invention is used for the exhaust of underwater vehicles. The device has a compact structure, can be directly installed in the exhaust pipe system, does not occupy external space, eliminates air pulsation, turbulent jet noise and bubble noise, and the noise reduction frequency range is from pulsation to low frequency 200Hz. Up to the high frequency 5000Hz generated by turbulent jet flow, the noise reduction effect is above 18dB.