526 results about "Comb filter" patented technology

In a physiological monitor, a method and an apparatus for determining a patient's pulse rate using data corresponding to a plurality of wavelengths of electromagnetic energy transmitted through the tissue of the patient. The method includes tracking the pulse rate in the data using an adaptive comb filter, the data having signal portions corresponding to the pulse rate and signal portions corresponding to noise, periodically calculating a frequency power spectrum of one of the wavelengths, and using the frequency power spectrum in a pulse rate calculator to determine the pulse rate or to verify the pulse rate calculated by the pulse rate calculator.

The subject invention pertains to a frequency modulation continuous wave (FMCW) radar system. Embodiments relate to methods of improving the performance of such a FMCW system and improving the value of the information provided by such a FMCW system. In an embodiment of the subject invention, the IF level can be monitored while sweeping the frequency of the system through at least a portion of the frequency range of the system. In a specific embodiment, the system is then set to the frequency that produces the minimum IF level, which is the frequency that produces the minimum AM signal level. Embodiments of the invention pertain to techniques for expediting the adaptation of the comb filter to the signal when the system is turned on. In an embodiment, in order to reduce the number of detection calculations a processor performs every frame, a method of quickly determining the largest peaks in the RDM is implemented. Embodiments of the subject invention relate to a method for processing a radar signal that classifies two or more targets. A specific embodiment of a method for processing the radar signal classifies a human target or other target(s) using amplitude values in time-consecutive range-Doppler maps. Embodiments of the invention pertain to a method for processing a radar signal for improving the performance of FMCW detection, tracking, and classification algorithms. Embodiments improve such performance by increasing the SNR and velocity measurement resolution of slow moving targets while minimizing DSP computational and memory requirements in two-dimensional FFT range-velocity processing.

Embodiments pertain to methods of improving the performance of a frequency modulation continuous wave (FMCW) radar system and improving the value of the information provided the FMCW system. In an embodiment, the IF level is monitored while sweeping the frequency of the system through at least a portion of the frequency range of the system and the frequency is set to produce the minimum IF level. Embodiments expedite the adaptation of the comb filter to the signal when the system is turned on. In an embodiment, a method of quickly determining the largest peaks in the RDM is implemented. Embodiments relate to a method for processing a radar signal that classifies two or more targets. An embodiment classifies a human target or other target(s) using amplitude values in time-consecutive range-Doppler maps. An embodiment processes a radar signal for improving the performance of FMCW detection, tracking, and classification algorithms.

The invention is directed to a method of 3-dimensional (3D) comb filter video decoder. The composite video signal is sampled to obtain multiple sampling data FmPx,y, which represents the yth pixel of the Xth line in the mth frame, in which m, x, y are positive integer. After using Fm+1Px,y, FmPx,y, Fm−1Px,y, and Fm−2Px,y to judge whether the composite video signal is the motion state or the still state. The motion detection is based on the composite video signal without separation of luma and chroma. As a result, the motion detection can be precisely judged.

The invention discloses a stepped impedance resonator (SIR) coaxial-cavity band-pass filter, which is of a comb-shaped filter structure formed by coupling an SIR fundamental resonator unit. The SIR fundamental resonator is composed of three parts of a bar-shaped inner layer metal transmission line, an outer layer cylinder metal wall in coaxial with the inner layer metal transmission line and a middle medium layer. The inner layer metal transmission line is an SIR resonance rod formed by combining two sections of coaxial transmission lines with different diameters. An open circuit coaxial bored hole and a tuning screw are arranged at the top end of the open circuit end of the metal transmission line, and the top end of the open circuit end of the metal transmission line is provided with a windowing coupling screw coupling structure and an input output direct coupling structure. The filter has good spurious frequency rejection characteristics, is small in size compared with a traditional base station, meets requirements of modern communication systems for miniaturization, low insertion loss, high selectivity and wide attenuation band on filters, and can be widely applied to modern mobile communication systems.