45results about How to "Reduce modulation" patented technology

For optical communications, apparatus and methods are provided for performing dispersion compensation management that suppresses intra-channel nonlinearities, inter-channel cross-phase modulation (XPM) and/or nonlinear polarization scattering. In optical communication, in which wavelength division multiplexed (WDM) channels are modulated, detecting and measuring channels with coherent detection is complicated due to impairments caused by neighboring channels. Apparatus and methods are provided which reduce the effect of impairments by performing in-line Periodic Group Delay (PGD) dispersion compensation on a WDM signal so as to enable detection of individual channels without severe degradation of system performance. Preferably the PGD dispersion compensator has within a channel a chromatic dispersion substantially similar to a DCF and between channels the group delay is substantially similar.

A system and method of signal processing for a hearing implant. The hearing implant includes at least one electrode, each electrode associated with a channel specific sampling sequence. An acoustic audio signal is processed to generate for each electrode a band pass signal representing an associated band of audio frequency. For each electrode, a sequence signal is determined as a function of the electrode's associated band pass signal and channel specific sampling sequence. An envelope of each band pass signal is determined. The envelope of each band pass signal is filtered to reduce modulations resulting from unresolved harmonics, creating for each electrode an associated filtered envelope signal. Each electrode's sequence signal is weighted based, at least in part, on the electrode's associated filtered envelope signal.

Systems and methods for reducing head media spacing (HMS) from about 100 Angstroms to about 65 Angstroms or less, without substantial reductions in the carbon overcoat or lubricant thickness. A protruding feature extends above the actuated portion of the air bearing surface and generally covers the read-write sensors. The protruding feature can either be static or thermally actuated. The protruding feature is small enough to engage with the lubricant without causing large head media disturbances and lubricant pickup and re-distribution or preventing contact detection. The protruding feature is also extremely small relative to the size of the actuated portion of the air bearing surface, but large enough to provide a wear and corrosion resistance to head media spacing sensitive features.

Gracefully forcing two V.34 fax devices to use legacy G3 modulations (e,g., V.21, V.27ter, V.29, V.17) when communicating over a packet network (e.g, voice over Internet Protocol (VoIP)network). To force an originating fax terminal 10 and receiving fax terminal 18 to fallback to legacy modulation procedures, transmission of a Call Menu (CM) “FAX” signal 54 transmitted by the originating fax device 10 is suppressed S38 at either the originating VoIP/FoIP gateway 12 or answering VoIP/FoIP gateway 16. The suppression of the CM signal 54 forces the answering V.34 fax device 18 to timeout and fallback to non-V.34 fax modulations S40 as if the calling terminal 10 was not V.34-capable. Likewise, upon detecting the non-V.34 fax signals, the originating V.34 fax device 10 will fallback to non-V.34 fax procedures S42. The two V.34 fax terminals will continue the fax transmission using non-V.34 modulations S44.

In a phase change memory, electric property of a diode used as a selection device is extremely important. However, since crystal grain boundaries are present in the film of a diode using polysilicon, it involves a problem that the off leak property varies greatly making it difficult to prevent erroneous reading. For overcoming the problem, the present invention provides a method of controlling the temperature profile of an amorphous silicon in the laser annealing for crystallizing and activating the amorphous silicon thereby controlling the crystal grain boundaries. According to the invention, variation in the electric property of the diode can be decreased and the yield of the phase-change memory can be improved.

A light source device according to the invention includes a light source, a light separating/combining element including a dichroic layer, a wavelength conversion layer, and a diffusely reflecting element. A bundle of light beams emitted from the light source includes a first light bundle and a second light bundle. The first light bundle enters the wavelength conversion layer via the dichroic layer. The second light bundle enters the diffusely reflecting element without entering the dichroic layer, and is converted into diffusely reflected light. The dichroic layer combines the third light bundle from the wavelength conversion layer and the diffusely reflected light from the diffusely reflecting element with each other.

A method of manufacturing a coherent light generator, especially a vertical cavity surface emitting laser (VCSEL), includes a gallium based semiconductor alloy substrate, a first DBR stack over the substrate, a first n-type clad layer over the first DBR stack, an active region containing quantum wells over the first n-type clad, a tunnel junction having an n-type and a p-type material and a boundary over the active region so that there is a standing wave null at an operating wavelength at the n-type/p-type boundary in the tunnel junction, a second n-type clad layer over the tunnel junction, an oxide aperture at least partially installed in the second n-type clad layer, and the second DBR stack over the second n-type clad of the coherent light generator. The novel VCSEL provides minimized internal optical absorption and has a low electrical resistance.

The invention provides a solar grating spectrum imaging device capable of correcting system aberration. On the premise that cost and system complexity are not increased evidently, an adaptive optical system with double wavefront detectors is formed by an adaptive optical system integrated in a telescope system and a wavefront detector arranged at a conjugation position of a focal surface of a spectrograph system. Therefore, the solar grating spectrum imaging device is not only capable of correcting dynamic wavefront aberration but also capable of correcting static aberration of the whole optical system to give great significance to improvement of spectral imaging quality of the spectrum imaging device.

A modulated intermediate frequency receiver is shown having a low noise amplifier for receiving a radio frequency signal and a modulation source for generating a modulation signal. A local oscillator generates a modulated local oscillator signal in response to the modulation signal. A first mixer mixes the output of the low noise amplifier with the output of the local oscillator. The output of the mixer is DC filtered and receive bandwidth filtered before input to a demodulator that generates a demodulated received signal. Further embodiments are shown for a complex receiver and having phase or frequency modulation compensation.

The invention provides a current-mode sensitive amplifier which is used for arraying information reading of a memory cell of a memory and comprises a feedback clamping circuit, a load balance circuit and a current comparing circuit, wherein a clamp voltage output end of the feedback clamping circuit supplies a clamp voltage to a read memory cell through the load balance circuit; the load balance circuit is used for balancing output voltages when the feedback clamping circuit is connected with different loads; the current comparing circuit comprises a same-phase input end, an opposite phase input end and an output end, wherein the same-phase input end is connected with a sampling current output end of the feedback clamping circuit, the opposite phase input end is connected with a reference memory cell, and the output end is used for outputting a comparing result of the current comparing circuit. By adding the load balance circuit, the modulation of different loads on the clamp voltage of the output end of the feedback clamping circuit can be reduced, the current deviation of the sampling memory cell can be decreased, and the reading margin of the memory can be improved.

System and methods for reducing the effects of imbalance between input signals in a gain controlled differential amplifier are shown. Distortion in the amplifier is reduced by modulating the gain control input based upon detected differences between the signal levels of the differential input signal source.

A light mark, a method and a device for light mark modulation and demodulation are disclosed. The modulation method includes: generating a mark with periodically alternating frequency and interval; and modulating the mark signal onto an optical signal. In the present disclosure, the mark with periodically alternating frequency and interval is adapted to distinguish different wavelengths by using different frequencies, and distinguish the same wavelength from different nodes by using the same frequency but different intervals. Therefore, numerous available marks are obtained with a small number of frequencies, and unique marks for all wavelengths in a network only require a number of frequencies equal to the number of the wavelengths in the network. Moreover, even if a wavelength conflict occurs, the wavelength conflict can be determined according to detected marks.

An RF MOS transistor having improved AC output conductance and AC output capacitance includes parallel interdigitated source and drain regions separated by channel regions and overlying gates. Grounded tap regions contacting an underlying well are placed contiguous to source regions and reduce distributed backgate resistance, lower backgate channel modulation, and lower output conductance.

The invention discloses a vibration monitoring system for an engine's high temperature crankcase. The system comprises a heat radiation installation station and a clamp ring belt. The lower end of the clamp ring belt is provided with a non-closed connection end with a bolt hole. In the bolt hole, a bolt is arranged cooperatively. The bolt is sleeved by a spring shim. The circular arc shaped installation end face at the bottom of the heat radiation installation station is fixedly connected with the top of the clamp ring belt. The middle part of the heat radiation installation station is provided with a heat isolation empty groove. The heat isolation empty groove of the heat radiation installation station is connected with a biased reinforced bar in a biased manner. The heat radiation installation station is provided with heat radiation holes. The top of the heat radiation installation station is provided with a vibration sensor. The vibration sensor is in electrical communication with an acquiring and analyzing system through data lines. According to the invention, the system is provided with a vibration sensor heat radiation support with self-adaptive compensation function for heat incurred deformation, and the sensor installation station is provided with heat radiation and weight losing holes, which can radiate heat effectively and provide a suitable mechanical environment for the installation of the sensor. The vibrations signal detected by the sensor is used for heads-up on one hand; and for fault diagnosis on the other hand.

A protective device for a transformer which is connected on the high-voltage side via supply lines to a network for transmission and distribution of electrical energy, wherein the transformer includes a neutral grounding, where each supply line is connected to ground via a grounding transformer , and where the grounding transformer includes a neutral point resistance which is lower than the neutral point resistance of the neutral grounding, such that Geomagnetically Induced Current flowing on the supply lines is diverted to ground.

A ribbon-type electroacoustic transducer with improved electrical, electromechanical, electromagnetic characteristics is described.