8 results about "Programmable filters" patented technology

The invention provides an electroencephalogram signal anti-interference circuit based on internal and external cooperative inhibition of a chip, belongs to the field of electroencephalogram signal acquisition anti-interference, and is used for solving the problems that in the prior art, single internal or external anti-interference measures are difficult to cooperate, and the adaptability to complex noise is limited. The circuit comprises an external anti-interference circuit (comprising an electrode interface, a shielding protection module, a signal preprocessing module and a programmable filtering array) and a chip internal circuit (comprising a special filtering module, an interference suppression module, a pulse coding module and a double-domain analysis module), and parameter collaborative optimization is realized through a dynamic adjustment module, so that the anti-interference capability of electroencephalogram signals can be improved; signal stability and accuracy are enhanced, and a complex noise environment is adapted.

This invention provides a self-heterodyne detection system capable of stably and over long periods of time measuring broadband laser linewidths. [Solution] The present invention discloses a self-heterodyne detection system. The system may include a frequency comb light source that generates light, a photodetector that detects the light, an electrical spectrum analyzer connected to the photodetector that analyzes the frequency and wavelength of the light using the detection signal of the photodetector, an interferometer including an input coupler provided between the frequency comb light source and the photodetector to receive the light, a branch waveguide branched by the input coupler, and an output coupler connected to the branch waveguide, and a programmable filter provided in the branch waveguide to select the peak wavelength of the light.

A system and method test sustained and anti-islanding capabilities of EUT, where a power island is sustained without anti-islanding functionality and becomes de-energized with anti-islanding functionality. The method includes applying grid voltage to the EUT to obtain measurement current from the EUT; calculating RLC component values of a programmable RLC filter from measurement current and source voltage, including calculating target gain and phase, calculating target R, L and C parameters using the target gain and phase, and translating the target R, L and C parameters to physical parameters; applying the physical parameters and the measurement current to the programmable RLC filter to obtain RLC voltage; comparing the RLC voltage to source voltage; and when the RLC voltage is substantially the same as the source voltage, predicting that transition to a power island with the applied RLC component values will be sufficiently smooth to avoid triggering system protections of the EUT.

A programmable filter for electronic signals. The filter includes an input that splits power of the input signal along two paths, a first and second path that is phase shifted by ninety degrees in respect of the first path. The first and second path are each modulated to the optical domain, and provided as input to respective filter chains. The in-phase signal can be filtered by IIR or FIR optical filters with configurable operation, as well the shifted signal can be filtered by a second chain of IIR and FIR optical filters with configurable operation. Resulting output from each filter chain is recombined and demodulated from the optical domain. In this manner, the electronic filter can adopt any suitable impulse response, including impulse responses described with complex coefficients. Real parts can be configured by operation of the first filter chain and imaginary parts by operation of the second filter chain.

The invention belongs to the technical field of broadband underwater acoustic signal acquisition and processing, and particularly relates to a multichannel broadband sonar signal conditioning circuit based on a programmable filter. Comprising a fixed gain preamplifier; an adjustable high-pass filter; an adjustable low-pass filter; an emitter follower amplifier; the programmable gain amplifier is connected with the output end of the emitter follower amplifier; the gain control unit is used for carrying out accurate gain control on the filtered signal, and the gain value is set by the micro-control unit through a digital communication interface SPI, so that the signal amplitude is adjusted to an optimal quantization interval; the differential amplifier is connected with the output end of the programmable gain amplifier; the analog-to-digital converter is used for converting an analog signal into a high-resolution digital signal; and the synchronous clock circuit is used for providing a homologous clock signal for the band-pass filter. The invention aims to solve the problems of poor flexibility, low multi-channel consistency, complex system, high cost and the like in the existing sonar signal conditioning technology.

The invention relates to a method for processing a video signal. An acceleration signal (221) describing a current acceleration of the motor vehicle from an acceleration sensor (22) of the motor vehicle is mapped to a change factor, a positive or negative correlation being present between the acceleration signal (221) and the change factor. According to the invention, a programmable filter is applied to a video signal generated by at least one camera (16) that detects at least a portion of the environment (26) of the motor vehicle (10), said programmable filter moving and / or selecting pixels of a still image (32) derived from a video obtained from the video signal, filter intensity affecting pixel movement and / or pixel selection is related to a change factor. The processed video signal is output on at least one display device (12) of the motor vehicle.

This application relates to a programmable CoI filter that implements shift-truncation division and its generation method. The filter includes an encoder, an integrator, a decimator, and a shift-truncation divider. The shift-truncation divider includes a shift adder and a truncation compensator. The encoder encodes the bit width of the input analog-to-digital converter (ADC) code stream. The integrator performs integration calculations on the encoded data. The decimator decimates the calculation result of the integrator in each conversion cycle. The shift-truncation divider adjusts the mapping relationship between the input / output port parameters and the hardware circuit, performs division operations on the decimated data, and obtains the final output result. This application can meet diverse application needs in the down-conversion field and improve design efficiency. It can also effectively reduce the calculation cycle and area overhead in the division operation of the CoI decimation filter, achieving division operations with high calculation accuracy, low area overhead, and short calculation cycle, thus possessing comprehensive advantages.