46 results about "Phase continuity" patented technology

An x-ray diagnostic apparatus and methods performs Real-Time Digital Radiography with particular application in dental x-ray imaging modalities, such as Orthopantomography, Scannography, Linear Tomography and Cephalography, by using a versatile and modular electronic unit, featuring ultra fast computation capability to serve diversified image sensor typology and scanning modality. In Digital Orthopantomography and Scannography, a plurality of tomographic images at different depths of the jaw can be generated, based on the pre-selection made by the user interface. The image processing unit utilizes for the tomo-synthesis of the diagnostic image an accurate and economic digital simulator of the radiographic film speed, including a digital frequency synthesizer fed with film cassette speed digital input and high resolution clock signal, ensuring accurate and reproducible phase continuity of the output frequency signal. It also introduces an automatic adaptation of the frame acquisition rate in frame transfer mode, based on the actual speed of the cassette unit. By this method the dynamic of the exposure signal is reduced, and a better optimization of the signal response of the x-ray detector is achieved.

A novel method and apparatus is disclosed for reducing power dissipation of RF power amplifiers when a reduced output power level is required. The mechanism has the specific purpose of optimizing the collector terminal voltage on portions of the amplifier's RF chain for maintaining linearity while minimizing power consumption. The apparatus permits a smaller DC to DC converter to be used than in prior art, such that it is implemented in the same semiconductor die or module. Furthermore, the invention eliminates the amplification and phase continuity issues that arise from switched state power amplifiers and envelope-following approaches.

A phase discontinuity mitigation implementation within a phased lock loop (PLL) improves throughput of a radio access technology. The throughput is improved by maintaining a phase of the PLL while powering off some devices of the PLL, such as a local oscillator (LO) frequency divider. In one instance, when the PLL is powered down, one or more portions of a delta sigma modulator for the PLL are clocked with a reference clock for the PLL. This implementation maintains phase continuity when the first phase lock loop turns back on.

The invention provides a sine non-linear Chips keying modulation method. The method comprises the following steps: according to bandwidth B and data symbol cycle T of a modulated signal, calculating a modulation parameter D; according to center frequency fc, symbol cycle T and the modulation parameter D of the modulated signal, generating two frequency change function f1(t) and f2(t) corresponding to two waveform samples s1(t) and s2(t) of the modulated signal; according to the frequency change function f1(t) and f2(t), generating two waveform samples s1(t) and s2(t) of the modulated signal; according to mapping criterion between binary system digital modulated data and the modulated waveform samples, generating modulated signal siT(t) corresponding to ith information symbol; generating modulated signal s(t); and converting the modulated signal s(t) to simulation modulated signal through a digital-analog converter. According to the method, the two modulated waveform samples are non-linear Chips signals whose frequency change is sine type. Because of phase continuity of modulated signal and small difference between modulated signal waveform samples, the modulated signal generated through the sine non-linear Chips keying modulation method has extremely high energy concentration degree which facilitates realization of digital communication with high bandwidth efficiency.

The invention relates to a modulation method and a modulation device by which optical continuous phase frequency shift keying (CPFSK) with any modulation index can be realized. The device comprises a modulation part and a demodulation part, wherein the modulation part is implemented by using a two-arm structure of a mach zehnder interferometer (MZM), and a phase continuity mode is implemented by controlling the time delay of an input waveform. The invention can provide a modulation-index variable optical CPFSK method and a modulation-index variable optical CPFSK device, by which an optical CPFSK signal with constant envelope, continuous phases and any modulation index can be generated, thereby overcoming a nonlinear effect in an optical transmission process, and improving the dispersion tolerance and the PMD (polarization mode dispersion) tolerance.

A method, system and apparatus for supporting common reference signaling in a wireless communication system are described. Some configurations introduce phase discontinuities between Common Reference Signal (CRS) transmissions on different subframes. This can solve problems that may arise when using a reduced CRS period. An indicator may also be sent from the base station to the user equipment (UE) to indicate whether phase continuity can be assumed. Some configurations may support CRS sequence initialization. These tools and techniques can use extended CRS sequence periods, which can increase the number of CRS sequences sent by a cell.