67results about How to "Enhanced low frequency" patented technology

A connector is provided for simultaneously improving both the NEXT high frequency performance when low crosstalk plugs are used and the NEXT low frequency performance when high crosstalk plugs are used. The connector includes a first compensation structure provided on an inner metalized layer of the PCB at a first stage area of the PCB, and a second compensation structure, provided at a second stage area of the PCB, for increasing compensation capacitance with increasing frequency.

A connector is provided for simultaneously improving both the NEXT high frequency performance when low crosstalk plugs are used and the NEXT low frequency performance when high crosstalk plugs are used. The connector includes PCB substrates made of materials having different dielectric frequency characteristics.

A video encoder is disclosed that includes an encoder circuit, a quantizer circuit and a control circuit. The encoder circuit may be configured to generate a number of coefficient values in response to a video stream and a number of quantized values. The quantizer circuit may be configured to generate the number of quantized values in response to the coefficient values, two or more quantization dead zones and two or more offsets. The control circuit may be configured to set the two or more quantization dead zones and the two or more offsets to different values. The two or more quantization dead zones and the two or more offsets are independently programmable.

A photovoltaic module-mounted AC inverter circuit uses one or more integrated circuits, several switches, solid dielectric capacitors for filtering and energy storage, inductors for power conversion and ancillary components to support the above elements in operation. The integrated circuit includes all monitoring, control, and communications circuitry needed to operate the inverter. The integrated circuit controls the switches in both an input boost converter and a single-phase or multi-phase output buck converter. The integrated circuit also monitors all power processing voltages and currents of the inverter and can take appropriate action to limit power dissipation in the inverter, maximize the available power from the associated PV module and shut down the inverter output if the grid conditions so warrant. The integrated circuit implements power line communications by monitoring the AC wiring for signals and generating communications signals via the same pulse-width modulation system used to generate the AC power.

A loudspeaker comprising a bending wave panel-form acoustic radiator having a first portion and at least one further portion a transducer for exciting bending waves in the radiator, the transducer being coupled to the further portion of the radiator to cause the radiator to radiate an acoustic output, and means confining low frequency radiation to the further portion of the radiator.

A connector is provided for simultaneously improving both the NEXT high frequency performance when low crosstalk plugs are used and the NEXT low frequency performance when high crosstalk plugs are used. The connector includes a first compensation structure provided on an inner metalized layer of the PCB at a first stage area of the PCB, and a second compensation structure, provided at a second stage area of the PCB, for increasing compensation capacitance with increasing frequency.

The invention discloses a differential phase contrast quantitative phase microscopic imaging method based on optimal illumination mode design. According to the method, an optimal illumination patterncorresponding to an isotropic phase transfer function in differential phase contrast quantitative phase imaging is deduced, the pattern is determined as a semi-circular illumination pattern whose illumination numerical aperture NAill is equal to a system object lens numerical aperture Naobj, the illumination intensity distribution starts from a direction axis and varies with the cosine of an illumination angle, and the intensity distribution can be expressed as S(theta)=cos(theta) in polar coordinates. According to the method, the frequency loss of the phase transmission is effectively compensated, the transmission performance of a highest frequency is enhanced, at the same time, the transmission property of low-frequency phase information is also significantly improved, the correctness and high resolution of a phase result are ensured, at the same time, the number of illumination axes is reduced to two by an optimal illumination scheme, the number of collected images needed by differential phase contrast quantitative phase imaging is greatly reduced, the imaging speed is improved, and a real-time dynamic phase imaging result with high accuracy and high resolution is obtained.

A planar magnetic driver includes covering plates that are maintained under tension to form a buckled or curved surface, thereby providing for a larger magnetic gap, and allowing for a larger excursion of the diaphragm and extended lower frequency response. Another aspect of the driver includes a corrugated region along the periphery of the diaphragm, which provides increased internal dampening.