37 results about "Burst frequency" patented technology

Electrobiological stimulation is carried out transcranially by applying high frequency squarewave bursts exhibiting no d.c. term across the cranial region. Such stimulation is commenced employing ramp generators and positive and negative voltage converters which evolve the requisite baseform and burst frequencies having a voltage waveform which is square in nature. Both voltage and current are sensed and subjected to comparator logic in conjunction with predetermined thresholds and windows. Overcurrent detection and overvoltage detection is provided in hard wired fashion to assure rapid shutdown response. D.C offset detection is provided along with waveform balance tests to further assure the safety of the system. Diagnostic procedures as well as therapeutic procedures may be carried out with a system version which provides for the application of a stimulus in conjunction with safety monitoring and controller based development of stimulating waveforms, all of which exhibits no d.c. term. Feed point voltage waveforms and current waveforms are mathematically processed and compared for diagnostic analysis.

An implantable pulse generator (IPG) that generates spinal cord stimulation signals for a human body includes a timing generator and high frequency generator. The timing generator generates timing signals that represent stimulation signals for multiple channels. The high frequency generator determines whether to modulate the timing signals and modulates them at a burst frequency according to stored burst parameters if the decision is yes. The high frequency generator can also independently control the pulse frequency of each channel according to the stored parameters. As such, the IPG provides the ability to generate both the low frequency and high frequency stimulation signals at different frequencies in different channels according to user programming in order to provide maximum flexibility in treatment.

An implantable pulse generator (IPG) that generates spinal cord stimulation signals for a human body includes a timing generator and high frequency generator. The timing generator generates timing signals that represent stimulation signals for multiple channels. The high frequency generator determines whether to modulate the timing signals and modulates them at a burst frequency according to stored burst parameters if the decision is yes. As such, the IPG provides the ability to generate both the low frequency and high frequency stimulation signals in different channels according to user programming.

A picture signal processing circuit capable of processing picture signals of various broadcast systems including the SECAM system, the PAL system and the NTSC system, wherein an FM demodulation circuit for demodulating a SECAM signal is used also as a portion of a burst frequency discrimination circuit. An input picture signal is demodulated by the FM demodulation circuit to obtain a frequency component thereof, and then a burst signal portion thereof is extracted by a burst extracting circuit. The extracted demodulated signal is integrated by an integration circuit, and compared with a predetermined value by a comparator, based on which the burst frequency is determined. Therefore, it is possible to instantaneously determine the burst frequency, and the circuit scale is reduced by sharing the FM demodulation circuit.

The present invention introduces methods to modify the burst frequency of an inverter in a given LCD panel without any component change on the inverter board. The present invention also introduces methods to adjust the setting of a sensing system for duty cycles and accept Display Power Saving Technology (DPST) input signals with different frequencies. The universal inverter module with the present invention can be applied for different DPST technologies.

A method of operating an acoustic pulse echo ranging system is provided. A series of acoustic energy pulses of successively increasing or decreasing burst frequencies are transmitted through a transducer assembly. For each transmitted energy pulse associated echoes are received and converted into an echo function over time. The obtained echo function is stored in a two-dimensional pattern whose first dimension is the burst frequency and whose second dimension is the time. Based upon the two-dimensional pattern a frequency response function is evaluated as a function of echo function values over burst frequency at a selected point of time.

A data processor (1) has a central processing unit (3) and a memory controller (6) capable of controlling a memory (8) to be connected to an outside. The memory has a buffer capable of temporarily holding data within an address range corresponding to a predetermined bit number on a low order side of an address signal, and a burst operation for inputting / outputting data can be carried out by a data transfer between the buffer and the outside for an access request in which an access address is changed within the address range. When causing the memory to carry out the burst operation to give an access, the memory controller performs an access control for freely executing the burst operation of the memory continuously if it detects an access exceeding the address range. When causing the memory to carry out the burst access, the memory controller performs an access control for freely executing the burst operation of the memory continuously if it detects the access exceeding the address range. Therefore, it is not necessary to restrict the burst access exceeding the address range and to limit a burst frequency. Consequently, it is possible to enhance a data transfer performance through the burst access together with the memory.

A microfluidic device has a body, multiple channels, multiple reservoirs and multiple capillary valves. The reservoirs are formed on the body. Each channel is formed on the body and connects to a corresponding reservoir. The channels include a main channel and at least one branch channel. The main channel is formed on the top of the body and extends in a direction from the center to a circumference of the body. Each capillary valve is mounted on a corresponding channel and at a distance substantially close to the center of the body so differences between the burst frequencies of the capillary valves are increased. The microfluidic device has an excellent flow control on sequentially releasing fluid through distinct burst frequencies of microcapillary valves.

The present invention provides a method and system for secondary users to detect cognitive radio spectrum, the method includes: Step 101) According to the difference of frequency hopping signal power spectrum over time, calculate The difference between the actual power spectrum and the average power spectrum of the data, thereby offsetting the fixed-frequency interference power spectrum and retaining the frequency-hopping signal power spectrum; step 102) performing inverse Fourier transform on the retained frequency-hopping signal power spectrum to obtain the autocorrelation function , and then use the time-domain autocorrelation algorithm to detect the frequency band containing burst fixed-frequency interference. Since the time-domain autocorrelation algorithm in the prior art does not consider the case of sudden fixed-frequency interference, that is, only considers a single signal superimposed with Gaussian white noise, the detection accuracy is very low. However, the improved time-domain autocorrelation detection method in the present invention takes into account the impact of sudden fixed-frequency interference on the detection result, thus making the detection accuracy higher.

A power supply apparatus (10) includes a voltage input side (102), a power switch circuit (104), a voltage output side (106), a pulse width modulation signal generating circuit (108) and a burst frequency detection circuit (110). According to a pulse width modulation signal (114), the pulse width modulation signal generating circuit (108) controls the power switch circuit (104), so that the power supply apparatus (10) enters a burst mode. The burst frequency detection circuit (110) detects a burst frequency of the power switch circuit (104). The burst frequency detection circuit (110) informs the pulse width modulation signal generating circuit (108) that the burst frequency is in an audio frequency range if the burst frequency is in the audio frequency range. The power supply apparatus (10) leaves from the burst mode to avoid audio noise.

In accordance with an embodiment, a method of driving a switching element in a switching converter includes generating a feedback signal that is dependent on the output voltage, driving the switching element in a plurality of subsequent burst cycles, determining a burst frequency, and adjusting an effective switching frequency in at least one burst cycle dependent on the determined burst frequency. Each burst cycle includes a burst-on period and a subsequent burst-off period, and determining the burst frequency includes evaluating a duration of at least one burst cycle.

The invention discloses a digital representation method of a coal-fired boiler operation state. The method comprises the steps that data is collected from four main tubes of a boiler; according to thecollected data, the corrosion rate of the boiler and parameters needed by the residual service life are calculated respectively; key data affecting boiler operation is screened out from the collecteddata according to corresponding boiler operation safety requirements; the residual wall thickness value of the boiler tubes, the residual service life value of the boiler and the smallest allowable thickness value of the boiler tubes are calculated respectively; the residual wall thickness valve, the residual service life value and real-time temperature and pressure values of the boiler are compared with specified allowable operation parameters of the boiler; the overall operation state of the boiler is judged; three state intervals are represented by different colors; different serial numbers are given to different boilers, and the serial numbers corresponding to the boilers are displayed through green, yellow and red on a display interface. The analysis accuracy of collected mass data is high, boiler real-time operation state health values can be visual, the tube burst frequency can be reduced, and long-period operation of the boiler is achieved.