32results about How to "Different frequency" patented technology

A fast wake-up crystal oscillating circuit includes: a crystal oscillator for generating oscillation signal, an amplifier set, a feedback resistor, first and second triggers and an amplifier switch logic. The amplifier set amplifies the oscillation signal. The feedback resistor supplies DC operation bias to the amplifier set. The first trigger has an input connected to the output of the amplifier set so that the first trigger is triggered by the amplified oscillation signal to generate a first clock. The second trigger has an input connected the output of the amplifier set so that the second trigger is triggered by the amplified oscillation signal to generate a second clock, wherein the second trigger has a hysteresis voltage higher than a predetermined value. The amplifier switch logic is connected to the second trigger to gradually decrease the amplification of the amplifier set when detecting that the second trigger generates the second clock.

A non-volatile memory system, such as a flash EEPROM system, is disclosed to be divided into a plurality of blocks and each of the blocks into one or more pages, with sectors of data being stored therein that are of a different size than either the pages or blocks. One specific technique packs more sectors into a block than pages provided for that block. Error correction codes and other attribute data for a number of user data sectors are preferably stored together in different pages and blocks than the user data.

A method of operating a wavelength swept source apparatus includes generating a single mode light, and generating a basic optical comb including light rays having identical frequency differences with adjacent light rays by modulating the generated single mode light. The method further includes generating other optical combs that include the same number of light rays as that of light rays of the optical comb that has a frequency band different from that of the basic optical comb, and is distributed in a frequency band wider than that in which the basic optical comb is distributed, by modulating the light rays of the basic optical comb. The light rays of the basic optical comb and the light rays included in the other optical combs are sequentially emitted according to frequencies of the light rays of the basic optical comb and the light rays included in the other optical combs.

A multiple wavelength signal generation device of the present invention is a multiple wavelength signal generation device having an optical comb generator for obtaining an input light and a group of lights shifted from the input light by predetermined frequencies; and an optical adjusting portion adjusting lights to be inputted to the optical comb generator; wherein the optical comb generator is composed of an optical fiber loop (105) which is provided with an optical SSB modulator (101), an optical amplifier (102) for compensating a conversion loss at the optical SSB modulator, an optical input port (103) for inputting lights from the light source, and an optical output port (104) for outputting lights, and the optical adjusting portion is composed of a phase modulator, an intensity modulator, or a frequency modulator.

A levitation distance sensor for maglev trains capable of compensating cogging effect, the probe coil is composed of a displacement detection coil and a compensation coil, wherein the displacement detection coil is composed of two identical 8-shaped detection coils arranged side by side along the track, Two rectangular coils with the same size and opposite winding directions are also arranged along the transverse direction of the track. The width of the detection coil along the longitudinal direction of the track is the length D of the track cogging unit; there are two pairs of compensation coils, and the two pairs of compensation coils are staggered along the longitudinal direction of the track by 1 / 4 The cogging unit length D, a pair of compensation coils are superimposed within the range of a corresponding detection coil; each pair of compensation coils is composed of two columns of compensation coils whose longitudinal distance along the track is 1 / 2 the cogging unit length D. The sensor can compensate the cogging effect, and the detected levitation distance is accurate, reliable and has high precision.

The invention discloses a non-interventional fire hydrant water pressure detection method based on time-delay accumulation of multiple ultrasonic signals, comprising steps: S1. Using an ultrasonic transducer to generate multiple frequency-agile ultrasonic longitudinal wave sinusoidal excitation signals as input to detect ultrasonic signals; S2 . Acquire all reflected echo signals and transmitted echo signals corresponding to the input detection ultrasonic signal; S3. Accumulate the time delay interval of all acquired reflected echo signals and transmitted echo signals; S4. Accumulate all acquired reflected echoes The transmission distance difference between the signal and the transmitted echo signal; S5. Estimate the accumulated delay interval and transmission distance difference to obtain the ultrasonic wave velocity, and correct the obtained ultrasonic wave velocity; S6. Detect the water pressure of the fire hydrant according to the corrected ultrasonic wave velocity. The invention can realize the non-intervention, real-time, accurate, convenient, fast, efficient and cheap fire hydrant water pressure detection, and meets the practical application requirements of the fire hydrant water pressure detection.

The present invention provides a fractional frequency divider, wherein the fractional frequency divider includes a plurality of registers, a control signal generator and a clock gating circuit. Regarding the plurality of registers, at least a portion of the registers are set to have values. The control signal generator is configured to generate a control signal based on an input clock signal and values in the at least a portion of the registers, wherein the control generator sequentially generates the control signal during each cycle of the input clock signal. The clock gating circuit is configured to refer to the control signal to mask or not mask the input clock signal to generate an output clock signal.