5results about How to "Wide operating frequency range" patented technology

The invention discloses a tunable topological circuit resonator based on dark solitons in nonlinear SSH crystal lattices. The resonator comprises a first port, a second port and N circuit unit cells which are sequentially connected in series, N is a positive integer larger than 1, and each circuit unit cell is provided with two coupling nodes; two coupling nodes of the (N-1) non-isolated circuit unit cells are connected with the first port, and two coupling nodes of one isolated circuit unit cell are not connected with the first port; two coupling nodes of each circuit unit cell are connected with the second port through the nonlinear resonance unit; the two coupling nodes of the same circuit unit cell and the two adjacent coupling nodes of the adjacent circuit unit cells are connected through coupling capacitors or coupling inductors. According to the tunable topology circuit resonator based on the dark solitons, the working frequency range is widened, and a new solution is provided for a high-performance and reconfigurable microwave and radio frequency circuit system.

The application discloses a brain-computer interaction device with steady-state visual stimulation function and a brain-computer interaction method thereof, and comprises four parts of a control module (1), a partitioned backlight module (2), a liquid crystal module (3) and an electroencephalogram interaction module (4). Wherein, the output end of a partitioned backlight control circuit of the control module is connected with an LED driving circuit of the partitioned backlight module, the output end of a liquid crystal panel control circuit of the control module is connected with a liquid crystal driving circuit of the liquid crystal module, and the input end of the control module is connected with the output end of a signal processing module in the electroencephalogram interaction module. The application combines the steady-state visual stimulation brain-computer interaction and the partitioned backlight liquid crystal display technology, generates different frequency and phase coding space-time coding visual stimulation through the interaction interface based on the steady-state visual stimulation for different time and space, and improves the accuracy of the brain-computer interaction and the information transmission rate.

The invention relates to a piezoelectric-electret synergistically coupled low-frequency vibration energy taking device, which belongs to the technical field of vibration energy taking and comprises a coupling beam base, a cantilever beam fixed end, a piezoelectric cantilever beam, a movable end insulating mass block, an electret bracket, an electret film and a copper electrode plate, the cantilever beam fixing end is fixedly connected with the coupling beam base, one end of the piezoelectric cantilever beam is connected with the cantilever beam fixing end, and the other end of the piezoelectric cantilever beam is fixedly connected with the movable end insulation mass block and the copper electrode plate; the electret film is fixedly connected with the electret bracket; the copper electrode plate and the electret film are oppositely arranged in a non-contact manner; the piezoelectric cantilever beam comprises a metal pole plate in the center, an upper piezoelectric layer and a lower piezoelectric layer; and the piezoelectric component and the electret electrostatic component are respectively connected with an energy management circuit.

The invention discloses a unit frequency control method and device, a storage medium and heating and ventilation unit equipment. In a multi-unit parallel system, a host serves as a unique instruction center to uniformly schedule all units to start, it is ensured that the units synchronously enter a controlled state, and a foundation is laid for a follow-up unified frequency strategy. After the system is started, the host calculates and issues the optimal frequency range, so that the slave operates in the efficient interval, and the overall energy efficiency and the individual fine tuning space are both considered. During operation, the host continuously monitors multi-dimensional parameters of the system during operation, the adaptability of the current frequency range to actual requirements is evaluated, and accurate state diagnosis and data support are achieved. And when the original range cannot meet the requirement, the host dynamically calculates and synchronizes the updated frequency range to all the slaves. According to the mechanism, the overall energy efficiency of the system is maintained to be optimal, the units are ensured to be coordinated when the load is increased, the output capacity is smoothly improved, and the overall stability and reliability of the system are improved.

The application provides a non-synchronous measurement method of a cyclostationary sound source, a storage medium and computer equipment. The non-synchronous measurement method of the cyclostationary sound source comprises the following steps: using a microphone array with M channels to measure a to-be-measured sound source at different positions for P times; respectively calculating cross cyclic spectrum matrices of sound signals obtained by the microphone array at different positions; stacking the cross cyclic spectrum matrices according to diagonal lines to obtain a data-missing cross cyclic spectrum matrix with a dimension of MPxMP; constructing a constraint problem based on a completion target of the data-missing cross cyclic spectrum matrix, completing matrix completion of the data-missing cross cyclic spectrum matrix, and forming a completed cross cyclic spectrum matrix. The technical scheme of the application can be widely applied to the technical field of cyclostationary sound source measurement.