8results about How to "Improve frequency response" patented technology

The invention discloses a low-noise harmonic suppression radio frequency system for filter band control. The low-noise harmonic suppression radio frequency system comprises a Chebyshev low-pass frequency hopping filter, a power element parameter control module, a harmonic suppression module and a low-noise amplifier, wherein the Chebyshev low-pass frequency hopping filter comprises a plurality of power elements; an external radio frequency signal is used as the input of the Chebyshev low-pass frequency hopping filter, and the output end of the external radio frequency signal is connected with the input end of the harmonic suppression module; the power element parameter control module is connected with a power element of the Chebyshev low-pass frequency hopping filter through a multiplexer switch; the input end of the harmonic suppression module is connected with the output end of the Chebyshev low-pass frequency hopping filter; the low noise amplifier is connected with the output end of the harmonic suppression module; the input end of the low-noise amplifier is connected with the output end of the harmonic suppression module. Through cooperative work of the modules, radio frequency signals can be efficiently processed, and the targets of frequency band control, harmonic suppression and noise suppression are achieved.

The invention relates to a monitoring ball signal extension system and method based on a multi-mode networking module, and belongs to the technical field of power transmission and transformation construction safety monitoring. The system comprises a signal detection module, a networking mode selection module, a signal processing module, a signal transmission module, a monitoring system integration module and an external signal enhancement device. The signal detection module monitors signal intensity and interference conditions; the networking mode selection module automatically selects a networking mode in sequence; the signal processing module optimizes the video signal; the transmission module transmits signals; the monitoring system integration module interacts with the monitoring platform; the external signal enhancement device comprises an antenna gainer and a signal repeater. The system can realize automatic networking, adapts to a complex environment, ensures stable transmission of signals, improves imaging quality, enhances monitoring flexibility, optimizes data processing, is suitable for safety monitoring of a power transmission and transformation construction site, and ensures smooth engineering.

The invention discloses a cooperative control method for a floating type photovoltaic-hybrid energy storage system, and the method employs a flexible connection and semi-tensioning mooring design, and is suitable for a 0-degree head wave long-period working condition. Improving maximum power tracking control, and inhibiting power point oscillation based on a partition variable step size and a prediction power algorithm; hybrid energy storage power is distributed through a low-pass filter, a storage battery and a super capacitor cooperatively process high / low frequency fluctuation, and the service life is prolonged by combining charge partition management; a virtual synchronous generator VSG adaptive control strategy is provided, an improved particle swarm optimization algorithm is adopted to optimize a J / D initial value, and frequency fluctuation is dynamically suppressed; an optical storage grid-connected system is established for verification, and the VSG technology enables the power frequency fluctuation to be quickly stabilized, thereby guaranteeing the stable operation of the system.

The invention belongs to the technical field of monitoring cameras, and particularly relates to a method for improving talkback tone quality of a monitoring camera. The method comprises the following steps of: firstly, widely collecting an audio data set containing pure voice and various environmental noises, and preprocessing and normalizing by using a frequency spectrum subtraction algorithm and a Wiener filtering algorithm; then, selecting a convolutional neural network (CNN) architecture to perform cross validation training on preprocessed data to optimize model parameters; in the key Wiener filtering link, the received audio is firstly subjected to direct current removal and trend term processing, the power spectral density is independently estimated in different periods or frequency bands, adaptive filtering dynamic adjustment and smoothing technology noise reduction are carried out, and a filter response is set according to an optimization ratio. Through series processing, noise is accurately filtered out, voice characteristics are preserved, voice definition, identifiability and real-time performance are greatly improved, talkback tone quality is remarkably optimized, and user experience and commanding and dispatching efficiency are powerfully improved.

The utility model discloses a guide mechanism of a vibration test bench. The guide mechanism comprises an upper guide mechanism and a lower guide mechanism. The upper guide mechanism comprises a plurality of tension spring guide assemblies and a plate spring guide assembly, each tension spring guide assembly comprises a tension spring body, each plate spring guide assembly comprises a plate spring body, and the lower guide mechanism comprises a guide column. The vibration test bench further comprises a bench body, an inner drive and a moving coil, at least part of the moving coil is located in the bench body and can move in the vertical direction, the moving coil is connected with an upper cover plate of the bench body through plate spring guide assemblies and tension spring guide assemblies which are evenly distributed in the circumferential direction of the moving coil, and the vertically-arranged guide columns are inserted in the inner drive. According to the utility model, the movement direction of the moving coil can be limited, so that the vibration test bench has good lateral ratio, uniformity and frequency response when in use, and the precision of the vibration bench during testing is improved.

This application relates to the technical field of electronic filtering, and in particular to a miniaturized ceramic dielectric filter capable of handling high power. The filter includes a ceramic cover plate, a cavity, an insulating kit, an inner conductor sheet, and a connector. The ceramic cover plate is silver-plated and sealed to the top of the cavity. Each side of the cavity has an interface penetrating the side wall. Two insulating kits are located inside the cavity, each corresponding to one of the interfaces. The inner conductor sheet is housed within the insulating kit. The connector passes through the interface, and its end connects to the inner conductor sheet. This application improves transmission efficiency, reduces losses, lowers heat dissipation, and extends product lifespan. The insulating dielectric completely encapsulates the inner conductor, effectively increasing the filter's power output. Compared to conventional ceramic dielectric filters ranging from a few watts to tens of watts, this filter can handle high-current, high-frequency signals, thus broadening its application scope.

The utility model relates to an urban geological safety tremor early warning system probe, which comprises a probe shell, a sensor assembly and a signal processing circuit, the sensor assembly and the signal processing circuit are arranged in the probe shell, the sensor assembly comprises a broadband MEMS sensor, and the signal processing circuit is integrated with a sigma-delta A / D digital quantity filter and a sigma-delta A / D modulator. The broadband MEMS sensor is electrically connected with the sigma-delta A / D modulator through an MEMS sensor electric connection pin, the sigma-delta A / D digital quantity filter is electrically connected with the sigma-delta A / D modulator, and the sigma-delta A / D digital quantity filter is electrically connected with the probe cable. The system has the capabilities of high-sensitivity vibration detection, environmental noise suppression, automatic inclination correction and remote monitoring, significantly reduces the false alarm rate of geological disasters, and is suitable for long-term deployment in cities and remote areas.

The utility model relates to the technical field of radio frequency signals, in particular to a power amplifier circuit for a radio frequency front-end component, which is characterized in that the input end of an amplifier is connected with the transmitting end of a radio frequency transceiver, the output end of the amplifier is connected with one end of a first biasing circuit, and the other end of the first biasing circuit is connected with the input end of a power amplifier; the output end of the power amplifier is connected with one end of the second biasing circuit, the other end of the second biasing circuit is connected with the input end of the low-pass filter, the output end of the low-pass filter is connected with the feedback channel and the output end of the coupler, and the coupling input end of the coupler is connected with the input end of the power detector. According to the scheme, high-frequency signals and low-frequency signals are selectively fed back through the feedback channel, self-oscillation is avoided, the frequency response of the amplifier is improved, the high-frequency performance of the amplifier is better, high-frequency distortion is reduced, and meanwhile the gain instability of a low-frequency band is avoided.