An instrument for locating noise in a CATV system is disclosed. The instrument comprises an electrical circuit assembly moveable within an outer body. The electrical circuit assembly includes a filter configured to suppress noise frequencies in the CATV system. The instrument also includes a mechanical biasing element coupled to the electrical circuit assembly to bias the electrical circuit assembly in a position relative to the outer body.

An instrument for locating noise in a CATV system is disclosed. The instrument comprises an electrical circuit assembly moveable within an outer body. The electrical circuit assembly includes a filter configured to suppress noise frequencies in the CATV system. The instrument also includes a mechanical biasing element coupled to the electrical circuit assembly to bias the electrical circuit assembly in a position relative to the outer body.

A method may include measuring a physical quantity associated with a load driven by an amplifier, generating a windowing function having a variable length and based on a number of samples of the physical quantity to be processed, applying the windowing function to the physical quantity, performing a transform on the physical quantity as filtered by the windowing function, and determining a characteristic of the load based on the transform.

A method may include measuring a physical quantity associated with a load driven by an amplifier, generating a windowing function having a variable length and based on a number of samples of the physical quantity to be processed, applying the windowing function to the physical quantity, performing a transform on the physical quantity as filtered by the windowing function, and determining a characteristic of the load based on the transform.

A physiological state index calculation system, a physiological state index calculation method, and a non-transitory computer readable medium for capturing subtle changes in a physiological state of a living body are provided. The physiological state index calculation system includes a band-pass filter that filters cerebral blood flow waveform information obtained from a cerebral blood flow of a living body in at least one frequency band, and a complex number conversion unit configured to convert the filtered cerebral blood flow waveform information into a complex number for at least one frequency band. The cerebral blood flow waveform information converted into a complex number by the complex number conversion unit is an oscillator that reflects a physiological state of a living body.

A physiological state index calculation system, a physiological state index calculation method, and a non-transitory computer readable medium for capturing subtle changes in a physiological state of a living body are provided. The physiological state index calculation system includes a band-pass filter that filters cerebral blood flow waveform information obtained from a cerebral blood flow of a living body in at least one frequency band, and a complex number conversion unit configured to convert the filtered cerebral blood flow waveform information into a complex number for at least one frequency band. The cerebral blood flow waveform information converted into a complex number by the complex number conversion unit is an oscillator that reflects a physiological state of a living body.

A software-defined radiometer includes dual RF front end channels. One RF front end channel processes the horizontal polarization signals and the other RF front end channel processes the vertical polarization signals. Each RF front end channel includes a power splitter for splitting the polarization signals into a plurality of identical polarization signals, a filter bank of N-bandpass filters that have the same bandwidth but different center frequencies and a multi-input switch. The bandpass filters filter the horizontal and vertical polarization signals and provide a plurality of filtered horizontal and vertical polarization signals. A control circuit issues a control signal to the multi-input switch so as to route a desired one of the plurality of filtered horizontal and vertical polarization signals to a programmable frequency converter. The programmable frequency converter includes a programmable local oscillator that is configured to generate signals having any one of N frequencies and is used to produce intermediate frequency representations of the horizontal and vertical polarization signals. The intermediate frequency representations are converted into digital signals and processed to extract desired information and data.

A signal processing device includes a Kalman filter that extracts a DC component of an input signal by performing Kalman filter processing on the basis of observation noise and system noise which are estimated from the input signal.

A signal processing device includes a Kalman filter that extracts a DC component of an input signal by performing Kalman filter processing on the basis of observation noise and system noise which are estimated from the input signal.

Method and apparatus for generating asymmetric high-voltage waveforms with near-rectangular profiles. The method comprises producing selected low-frequency components of the Fourier series for a rectangular waveform explicitly and adding them to the amplified residual of lower-amplitude near-rectangular waveform upon filtering out certain frequencies.