32results about How to "Low audio noise" patented technology

Various embodiments of systems and methods for reducing audio noise are disclosed. One or more sound components such as noise and network tone can be detected based on power spectrum obtained from a time-domain signal. Results of such detection can be used to make decisions in determination of an adjustment spectrum that can be applied to the power spectrum. The adjusted spectrum can be transformed back into a time-domain signal that substantially removes undesirable noise(s) and / or accounts for known sound components such as the network tone.

An audio controlling device generates an audio mute signal based on the level of a power-supply voltage supplied from the source equipment, whether a clock signal has been input or not, whether a digital signal has been input or not, whether a multiplier circuit is being locked or not, an error rate, whether an audio clock detection circuit is being locked or not, the presence or absence of a change in a control signal, and whether a synchronization detection circuit is stable or not. The audio controlling device applies the audio mute signal to an audio mute circuit, while applying an OSD control signal to an OSD processing circuit. The audio mute circuit is placed in a mute state or unmute state based on the audio mute signal. The OSD processing circuit provides the on-screen display of a message based on the OSD control signal.

The present invention provides a step-up high-frequency link inverter, the circuit structure is composed of an input filter circuit, a dumping inductor, a high-frequency inverter, a high frequency transformer, a frequency current converter, an output filter circuit cascaded in orders, a high frequency electrical isolation fly-back converter energy feedback circuit composed of the frequency current converter, the high frequency energy storage transformer, the rectifier cascaded in orders is connected between the output load and the input DC power, capable of transforming the unstable DC voltage to the needed stable sinusoidal voltage having high grade, the inverter has advantages of high frequency electrical isolation, high output and input voltage matching ability, double-directional power flow, high transforming efficiency, small volume, light weight, small input current ripple, high load adaptability, lower audio noise, high credibility when the load is shortened, lower cost, large output capacity, wide application, establishing a critical technique for the new type inverter and static inverter having large capacity.

Provided are an apparatus and method for reducing digital noise. The digital noise reducing apparatus includes: a clarified signal generator configured to generate a clarity improvement pattern for increasing an energy ratio of an early reflection region with respect to all reverberations for a received audio source signal, to convolve the clarity improvement pattern with the audio source signal, and to output an audio source signal convolved the audio source signal with the clarity improvement pattern; an early reflection generator configured to output an early reflection signal convolved the audio source signal with an early reflection pattern; a late reverberation generator configured to receive the audio source signal, and to generate a late reverberation signal for attenuating digital noise of the audio source signal; and a noise attenuator configured to generate an audio signal added the early reflection signal and the late reverberation signal to the audio source signal.

A method for reducing audio noise of a display is provided. A horizontal synchronization signal, a reference signal and a substrate voltage signal are generated. The reference signal has a preset width at high level status. The status transition of the substrate voltage signal is based on each scan line corresponding to the horizontal synchronization signal. In each period of the substrate voltage signal, the status transition of the raising and falling edges is based on the high level status of the reference signal, and the transition timings of the raising edges and the falling edges are advanced or delayed based on a reference value of the high level status of the reference signal.

The invention relates to a differential buck direct current chopper type high frequency link inverter which is provided with a circuit consisting of two same high frequency electric insulation bidirectional buck direct current choppers which output low frequency positive half cycle unipolar sine pulse width modulating voltage wave and low frequency negative half cycle unipolar sine pulse width modulating voltage wave respectively in the form of differential circuits. LC filters are connected between an output end of a differential chopper and an output load and between an input direct current power supply and an input end of the differential chopper. The high frequency link inverter can transform an unstable direct current voltage into a required stable good-quality sine alternating current voltage, the high frequency link inverter has the advantages of high frequency electric isolation, strong matching ability of input voltage and output voltage, simple circuit topology, single stage power transformation, bidirectional power flow, high power density, high transformation efficiency, less output voltage ripple, strong load adaptability, low audio frequency noise, low cost, wide application prospects and the like and provides the key technology for a novel inverter power supply and a static convertor.

A control method for reducing audio noise is disclosed. The method includes the steps of: providing an input power source; providing a power source converter having a component with a mechanical resonant frequency, coupled to the input terminal or the output terminal of the power source converter; providing an output capacitor and a load connected in parallel therebetween; making the power source converter operate in a burst mode; and controlling the electrical energy transferred from the input terminal to the output terminal of the power source converter during an operating period of every burst cycle, so as to reduce the audio noise of the power source converter.

A distributed control type stream-light discharge process for desulfurizing fume is disclosed. Its wet discharge reactor is composed of thermal chemical reaction region and discharge plasma chemical reaction region with discharging electrode and receiving electrode. Said discharging electrode is connected with high-voltage power supply to generate stream-light discharge. Said power supply is controlled in distributed mode. After boiler fume goes through thermal chemical reaction and discharge plasma chemical reaction, the gas pollutant is removed and the liquid by-product is generated and dried to obtain dry powder. Its advantages are high power and long service life of power supply, low noise, and low cost.

This invention relates to a boost high frequency AC / AC converter, which circuit is cascaded by an energy storage inductor, an input cycle converter, a HF transformer, an output cycle converter and an input and output filter circuit to turn a bad unstable AC current to a stable shared high grade sine AC current having the advantages of high frequency electric isolation, simple topological circuit, two stages of power transformation, two-way power-flow, high power factor at the supply side.

A method for reducing audio noise of a display comprises the following steps: generating a horizontal synchronizing signal, generating a reference signal and generating a substrate voltage signal. The high level state of the reference signal has a predetermined width; the substrate voltage signal switches the state according to each scanning line corresponding to the horizontal synchronizing signal; during each period of the substrate voltage signal, a rising edge and a falling edge of the substrate voltage signal switches the state based on the high level state of the reference signal, and the state switching time of the rising edge and the falling edge is antedated or delayed based on the reference value of the high level state.

This invention relates to a mono-pole two-way step-down DC converter high frequency link inverter, the circuit of which is composed of two same high frequency electric isolated two-way power flow step-down DC converters outputting inverse low frequency sine pulse DC voltages in differential circuit, which can convert a DC voltage to necessary sine AC voltage having the advantages of simple circuit topology, isolated AC load and DC supply high frequency, two-way power flow, mono-pole power transformation and small volume.