38results about How to "Reduce the amount of jitter" patented technology

A distributed avionics system arranged in an aerial vehicle for controlling at least one avionics function. A plurality of avionics processing subsystems are interconnected in a network. Each avionics processing subsystem includes a processor arranged to process at least one task so as to provide a set of data messages including at least one unit of data related to controlling the at least one avionics function on basis of provided input data, related to conditions of the at least one avionics function. A memory module is in operative connection with the processor and is arranged to store instructions for the processor to process the at least one task. At least one of the avionics processing subsystems is arranged to transmit at least one synchronization cycle start signal onto the network

The invention discloses a dynamic data acquiring system and a method for precisely positioning an acquiring position thereof. The dynamic data acquiring system comprises an FPGA controller, a step motor, a driving circuit of the step motor, and a position sensor. An FPGA controlling circuit sends direction and pulse signals to the driving circuit of the step motor and maintains a position counter. The driving circuit of the step motor receives driving pulses and direction signals and drives the step motor to move. In the moving process of the step motor, when the FPGA detects that the position sensor has the effective jump, the FPGA resets the position counter, and the position counter counts the sent pulses; after a sent pulse number reaches the set position pulse number of acquiring points and the effective condition of the pulses is detected, the data acquiring operation is carried out. The invention has the advantages of accurate positioning of the acquiring points, high real-time performance, automatic control, simplicity, reliability and lower cost.

There is provided a scanning optical system which includes a light source, a line-like image forming optical system, a polygonal mirror, and an imaging optical system. The line-like image forming optical system forms a line-like image extending in the main scanning direction in the vicinity of a reflective surface of the polygonal mirror, and if the number of reflective surfaces of the polygonal mirror is less than or equal to six and if |m|>1.85, the following condition (1) is satisfied:

r<5 cos(w/2f)/[2|m|{1− cos(w/2f)}]  (1)

where r represents a radius of an inscribed circle of the polygonal mirror, m represents a lateral magnification of the imaging optical system in the auxiliary scanning direction, f represents a focal length of the imaging optical system in the main scanning direction, and w represents half of a scanning width.

A light scanning device includes a polygon mirror configured to be rotatable around a rotation axis to reflect and deflect a light beam with a plurality of reflecting surfaces, a light source that makes a light beam incident onto the polygon mirror from an outside of a scanning range of the light beam being scanned in a main scanning direction by the polygon mirror, and an image forming optical system that converges the deflected light beam as a spot scanned in the main scanning direction on a scanned surface. In a state where the light beam is directed to a center of the scanning range on the scanned surface, a chief ray of the light beam intersects with a reflecting surface at a point shifted by a predetermined amount in a direction toward a side opposite the light source front a center of the reflecting surface in the main scanning direction.

The invention discloses a driver and a method for outputting a low-jitter serial signal. The driver comprises a data time sequence adjusting module, a pre-driver, and an output driver. The data time sequence adjusting module is used for receiving clock signals ckp and ckn generated by a system circuit, even-bit data de, and odd-bit data do, and performing logic gate operation processing in order to output data de_smp and do_smp. The pre-driver is used for receiving the data de_smp and do_smp outputted by the data time sequence adjusting module and the clock signals ckp and ckn generated by the system circuit, and performing logic gate operation processing in order to output data dep, data dop, data den, and data don. The output driver is used for receiving the data dep, the data dop, the data den, and the data don outputted by the pre-driver and performing logic gate operation in order to output a low-jitter serial signal dos. The driver and the method for outputting a low-jitter serial signal finally output a low-jitter serial signal by means of reasonable circuit structural design.

A method of detecting jitter in a digital data signal having a waveform defined by a plurality of component frequencies, including the step of comparing an indicator of the power of a selected frequency portion of the digital data signal against a reference so as to provide an indicator of the shape of the frequency-power characteristic of the data signal.

The invention discloses an engine accessory system. The transmission mechanism comprises an air condition compressor belt pulley, a power steering pump belt pulley, an electrical generator belt pulley, an idle pulley and a tightening pulley, and is connected with a crankshaft pulley through a multi-wedge belt, the crankshaft pulley as a driving pulley realizes the belt transmission, the tightening pulley is positioned on the casing body of the engine through an automatic tension mechanism, and is arranged at the position adjacent the loose side of the crankshaft pulley. By adopting the technical proposal, an electrical generator with a bigger dynamic rotation inertia is controlled perfectly while the tightening pulley maintaines a system overall tension force, thereby the utilization ratio of the tightening pulley is improved, the working stability of the electrical generator is improved, and the slip ratio is reduced; the air condition compressor is placed at the tightest side of the multi-wedge belt, the startability of the air conditioning system is improved, the utilization efficiency of the accessories is improved, the vibration quantity of the belt is reduced, the noise is lowered, and the stability, as well as the total life and the efficiency of the system are improved.

The invention discloses a kind of optical disk data accessing device, has an optical head tilt control module, which is used to control the tilt quantity, decreases flutter of regenerate signal. The optical tilt control module includes regenerate signal generating unit, which is used to receive the radio frequency signal generated by the optical head, and generates EFM signal; flutter examining device, receives EFM signal, and examines the flutter of EFM signal; tilt control unit, which is used to correct tilt control value, and selects better value, in adjusting period it generates the tilt control value according to regenerate data; and tilt driver for receiving tilt control value and generates tilt control signal to drive optical head to rotate.

A clock distribution network having a separate power supply for top levels thereof is disclosed. In one embodiment, an integrated circuit includes a clock distribution network configured to distribute a clock signal to each of a number of clock consumers. The clock distribution network is arranged in a hierarchy of levels, with each of the levels including at least one buffer, and with the upper levels being closer to a source of the clock signal and the lower levels being closer to the clock consumers. The buffers of the upper levels are coupled to receive power from a first power source, via a first power grid. The buffers of the lower levels are coupled to receive power from a second power source, separate from the first, via a second power grid.

A motor driving device includes a first hysteresis comparator, a second hysteresis comparator, a logic circuit, a control unit, and an inverter circuit. The logic circuit receives a start signal or a start completion signal to output the first output signal as a commutation signal according to the start signal, or to output the second output signal as the commutation signal according to the start completion signal, clamps the second output signal by the first output signal, stops outputting the commutation signal after the potential state of the commutation signal is changed, and unclamps the second output signal with the first output signal and outputs the commutation signal in response to a difference voltage between the first input signal and the second input signal being greater than a positive value of the first hysteresis voltage or less than a negative value of the first hysteresis voltage.

The invention discloses a novel energy-saving building waterproof heat preservation outer wall structure, belongs to the technical field of building outer wall design, and aims to provide the novel energy-saving building waterproof heat preservation outer wall structure with a good heat preservation performance. According to the technical scheme, the outer wall structure comprises a heat preservation layer, wherein the surface of the heat preservation layer is coated with a decoration layer, and the outer wall structure further comprises a fixing cylinder pre-buried in the outer wall, a fixingrod is arranged between the heat preservation layer and the decoration layer in a penetrating mode, one end of the fixing rod stretches into the fixing cylinder to be elastically clamped with the fixing cylinder, the other end of the fixing rod stretches out of the decoration layer and is provided with a fixing plate, the fixing plate is provided with an internal thread barrel, the fixing rod isin threaded connection with the internal thread barrel, and a fastening nut is in threaded connection to the fixing rod and located on the side, back on to the outer wall, of the inner threaded barrel. The waterproof heat preservation outer wall structure has the advantages of energy conservation, heat preservation, waterproof and moisture-proof, green and environmental protection, and the like.

The discrimination circuit includes following parts: a first SR latch in use for generating a first output signal at predetermined state setup; a second SR latch in use for generating a second output signal at predetermined state setup; a predetermined state testing circuit in use for detecting the first output signal and the second output signal, and outputting a RCM signal based on the detection; a first predetermined state control circuit in use for setting up the first SR latch at the predetermined state based on the RCM signal; a second predetermined state control circuit in use for setting up the second SR latch at the predetermined state based on the RCM signal. The first SR latch and the first predetermined state control circuit can receive a first input signal. The second SR latch and the second predetermined state control circuit can receive a second input signal.

Data circuit power supply wiring for supplying power supply voltage to a data circuit and clock circuit power supply wiring for supplying power supply voltage to a clock circuit are connected by a via and power supply wiring formed in a wiring layer that is different from (for example, that is located higher than the data circuit power supply wiring and the clock circuit power supply wiring) a wiring layer in which at least either the data circuit power supply wiring or the clock circuit power supply wiring is formed.

A method includes detecting, at a controller, a rate-of-change between first data traffic to be sent to a dynamic random access memory (DRAM) at a first time and second data traffic to be sent to the DRAM at a second time. The method also includes adjusting a data rate of the second data traffic in response to a determination that the rate-of-change satisfies a threshold.

The invention discloses a material scattering prevention device of a material piling and taking machine. The material scattering prevention device is characterized in that the material scattering prevention device comprises an adjustment assembly and a carrier roller assembly, wherein the adjustment assembly comprises steel wire ropes, carrier roller brackets, pulleys and counter weights; the carrier roller brackets are fixed to a trailer main beam; the pulleys are rotationally mounted at the upper parts of the carrier roller brackets; the steel wire ropes strides across the pulleys; the two ends of the steel wire ropes are fixed to the counter weights and the carrier roller assemblies respectively; and the counter weights and the carrier roller assemblies move up and down according to the quantity of materials on a conveying belt and stops moving till force balance. By controlling a distance between belt holding carrier rollers and a carrier roller, the activity space of the conveying belt is controlled, the vibration range of the conveying belt is reduced, and the material scattering quantity is reduced accordingly.