661 results about "Return-to-zero" patented technology

In a first aspect the present invention provides a compact high efficiency driver suitable for driving a loudspeaker, such as a miniature loudspeaker for mobile phones or hearing aids. The driver comprising an interface for receiving an input signal, a three-level modulator, and a three-level H-bridge. The interface may be adapted to receive a digital input signal. In a preferred embodiment of the driver the H-bridge is controlled by a correction circuit which is operated by a Return-To-Zero scheme. In a further preferred embodiment the driver comprises a supply voltage step-up circuit for increasing a voltage supplied to the H-bridge. In a second aspect the present invention provides a miniature loudspeaker assembly having a built-in driver. In a third aspect the present invention provides a mobile device with a built-in miniature loudspeaker assembly.

An improved Rail Adaptor System/Rail Accessory System (RAS) which attaches to a firearm. The rail is top opening, modular, and free floats the barrel. Provided is a rigid, lightweight, strong platform for mounting firearm accessories. Heat transmission from the barrel assembly to the user is limited. The user is also protected from ventilated gases originating from the operating system. A quick detachable top rail section is provided so that that gas system may be easily accessed. This removable top section of the rail is what makes this device unique because the RAS may be installed without removing the barrel, gas system, front sight base, flash hider or the barrel nut. The herein described RAS is adaptable to a wide variety of firearms with the use of conversion parts. The top rail “returns to zero” on reinstallation allowing the remounting of various optics and electronic gun sites without the need to realign them.

The present invention relates to a method for transmitting data. An optical pulse stream comprising a plurality of return-to-zero optical pulses is prepared by modulating a phase of light output by an optical source to thereby encode data from a data source. The light of the optical pulse stream has a wavelength. The optical pulse stream is transmitted along an optical fiber of an optical network. Optical pulse streams of the invention enhance transmission performance at least in part by reducing noise at the receiver caused by fiber non-linearities.

The invention discloses a multi-camera calibration and alignment fitting method. A posture of a target object is observed by using a first camera group; a posture of a fitting object is observed by using a second camera group; and rotating coordinate systems of the two camera groups coincide. A calibration process comprises a first calibration stage, a second calibration stage and a third calibration stage. In the first calibration stage, internal parameters and a camera mounting angle of each camera in the camera groups are calibrated; in the second calibration stage, the position, in an output coordinate system of each camera in the camera groups, of a rotating center of a correction platform is calibrated and the rotating coordinate systems are established according to the condition that the rotating center of the correction platform is a fixed point after returning to zero; and in the third calibration stage, mapping and calibration are performed: the first camera group is mapped and calibrated by the second camera group according to the condition that the rotating coordinate systems of the first camera group and the second camera group coincide.

A faucet mounted filter device includes a horizontally disposed cylindrical part for housing a replaceable filter cartridge and a horizontally disposed arm part extending radially from the cylindrical part which has a connector on its upper side for releasable connection to a downwardly discharging water faucet. A window is provided in the cylindrical part through which the water filtration capacity gallonage is visible. A built in microprocessor with a counter delivers data to a read-out at the front end of the cylindrical part which displays the gallonage of water filtered by the filter cartridge. A sensor connected to the microprocessor senses flow of filter water and installation and removal of the cartridge causes the counter to start counting and to return to zero, respectively.

The invention provides a train jump control method, a dynamic testing method and a jump benchmark parking method under an FAM (Full Automatic Mode). The jump control method comprises the following steps: an ATP transmits a jump instruction to an ATO, delays for T1 and then synchronously transmits a direction instruction to the train and the ATO; the train receives the direction instruction, then finishes jump preparation and transmits an effective feedback of the direction instruction to the ATO; the ATO receives the direction instruction and the effective feedback, delays for T2 and transmits a traction instruction to a train traction system; the ATO delays for T3, then transmits an instruction carrying a preset traction level to the train traction system, enables the train traction system to output a traction force and enables the train to jump; after jump distance reaches preset distance, the traction instruction is ineffective, and the traction level returns to zero; the ATO delays for T4, then transmits a braking instruction carrying a preset braking level to a train braking system, enables the train braking system to output a braking force, and enables the train to slow down and stably stop; after the train stably stops, the ATO delays for T5, then transmits jump finishing information to the ATP, and enables the ATP to determine the finishing of the jump. Based on the jump control method of the train, a dynamic testing result is more accurate, and jump benchmark parking is more precise.

There is provided an over-sampling D/A converter which has a mute function for fixing an average DC potential of an analog output signal to a predetermined potential, and comprises a SIGMA DELTA modulator for receiving a multibit digital signal to which a DC offset value is added and then outputting a one-bit non-return-to-zero signal, a signal generator for receiving the non-return-to-zero signal and the clock signal, then generating a return-to-zero signal which is a logical multiplication of the non-return-to-zero signal and the clock signal and a complementary signal of the return-to-zero signal which is a logical addition of the non-return-to-zero signal and an inverted signal of the clock signal, and then adding the return-to-zero signal to the complementary signal of the return-to-zero signal to thus output a polar-return-to-zero signal, and an analog filter for receiving the polar-return-to-zero signal and then outputting an analog signal. Accordingly, because an average DC potential of an output signal at the time of the mute operation-ON is set substantially equal to the average DC potential of the output signal at the time of the mute operation-OFF, variation in the average DC potential in the output signal due to ON/OFF of the mute operation can be prevented. As a result, generation of audible click noises can be prevented.

A light receiving circuit includes: a 1-bit delay interferometer; two photodiodes; and a demodulating circuit for converting current signals of the photodiodes into voltages to thereby demodulate signals that have been modulated by return-to-zero differential phase shift keying, the demodulating circuit including a differential transimpedance amplifier, in which the differential transimpedance amplifier includes a level adjusting circuit that has a function of adjusting levels of a positive phase signal and a negative phase signal of two feedback closed loops.

The invention relates to the technical field of computer aided engineering (CAE), in particular to a CAE (computer aided engineering)-based car body rigidity analysis method used for analyzing the bending rigidity and the torsional rigidity of a front longitudinal beam, a threshold and a rear longitudinal beam of the car body. The CAE-based car body rigidity analysis method comprises the following steps: establishing a finite element mesh model of the car body and a coordinate system; carrying out a simulation test by applying load and constraints; obtaining a processing result, and generating a curve; then, judging whether the processing result meets requirements; if the processing result meets the requirements, storing the processing result, and otherwise, establishing a finite element mesh model of the car body again to conveniently carry out a simulation test. In the method, the displacement and the torsion angle of a node are analyzed by the finite element mesh model of the car body to carry out rigidity analysis instead of calculating by selecting the node by experience, and therefore the result is more accurate; an analysis result is automatically obtained, the workload of engineers is lightened, and project development time is saved; the result can be returned to zero to make the result to be normalized, the result has high compatibility, and comparison and analysis can be conveniently carried out.

In an optical transmitter, continuous wave light from a laser passes through a data modulator (DM) for non-return-to-zero (NRZ) encoding of a data stream and through a pulse modulator to add return-to-zero encoding to the modulated optical signal. A modulator controller monitors the output optical signal power, optimizes the bias setting for the DM and the PM, and optimizes the phase relationship between the pulse and data components of the modulated optical signal. For each optimization, a low amplitude and low frequency dither signal is injected at appropriate points in the modulator. A single photo detector and electrical receiver are used in a multiplexed fashion to monitor the optical output signal and derive separate feedback signals. Remaining control circuitry forces a null in a respective residual dither component in the optical output signal to maintain the desired bias level or phase alignment.

A rotary vector gear for controlling longitudinal axis offset about a central longitudinal axis is disclosed. The device uses single rotary motion through a rotary vector gear to produce hypotrochoidic offset similar to a flower petal and is capable or ready return to zero offset. The device may be used in downhole rotary steerable oil and gas drilling tools and in computer controlled milling machines for providing controlled offset.

The invention relates to the field of battery detection and discloses a method for testing the liquid absorption rate of a battery diaphragm. The method comprises the following steps: (1) intercepting a diaphragm sample; (2) measuring the volume of the diaphragm sample, and recording the volume as V1; (3) putting a container filled with an electrolyte on an electronic scale, making the reading return to zero, fixing a circular ring by using a fine line, and recording reading of the scale as M1 after the circular ring is completely immersed and suspended in the electrolyte; (4) fixing the diaphragm sample on the circular ring, repeating the step (3), and recording reading of the scale as M2 within 1-180 minutes; and (5) substituting a formula L=(rhoV1+M1-M2)/V1 of the liquid absorption rate, and calculating the liquid absorption rate L. The method has the advantages of simplness in operation, accurate test result, simple equipment, high operability, low test cost and the like.

Embodiments include systems and methods for using generalized pulse amplitude modulation (PAM-X) signaling with an at-rate not-return-to-zero (NRZ) clock data recovery (CDR) system. Some implementations include dual-mode signaling for an at-rate CDR (e.g., using standard NRZ signaling at lower operating frequencies and pseudo-NRZ signaling derived from PAM-X signaling at higher operating frequencies. Embodiments derive an apparent direction of signal transition from PAM-X signaling. The direction can be used to calculate pseudo-NRZ values. For example, when the PAM-X signal transitions in an upward direction, a pseudo-current NRZ value and a pseudo-previous NRZ value of ‘−1’ and ‘+1’ can be generated, respectively. An at-rate NRZ CDR can use the pseudo-NRZ values and a derived error value to make an offset determination. The offset determination can then be used to offset a generated clock signal in the CDR system.

The invention discloses a five-degree-of-freedom mechanical arm inverse kinematics solving method. The method comprises the following steps that 1) a positive kinematics model is established accordingto mechanical arm D-H parameters; 2) a mechanical arm tail end pose error function model is established; 3), the tail pose error function is minimized based on an evolutionary strategy algorithm; 4),an mechanical arm inverse kinematics equation is iterated within an error function allowable error; and 5), if iteration is over, the error function is not returned to zero or allowable error, and the equation is returned to the step 2 to replace the initial joint value and re-calculate is carried out. The method provided by the invention can effectively solve the problem that the mechanical arminverse kinematics is unsolved due to unfilled rank of jacobian matrix during mechanical arm inverse kinematics iteration solving. The mechanical arm inverse kinematics solving method has high speed and extremely high precision.