3 results about "Passband" patented technology

An image capturing apparatus includes an image capturing device that captures an image of light from a subject, the light passing through each of wavelength band filters having invisible wavelengths as passbands, in which parts of the passbands of the filters whose center wavelengths are adjacent to each other mutually overlap, and a control unit that causes the image capturing device to capture an image of the light from the subject on which a first irradiation light is irradiated, the first irradiation light having a first spectral distribution in which parts of the respective passbands of the filters overlap with one another, and causes the image capturing device to capture an image of the light from the subject on which a second irradiation light is irradiated, the second irradiation light having a second spectral distribution in which parts of the respective passbands of the filters overlap with one another.

The invention relates to the technical field of laser processing, in particular to a filter for decomposing a galvanometer and a servo position. A Bessel filter is of a high-order structure with 4-10orders; preferably, a seven-order Bessel filter. The seven-order Bessel filter comprises a first-order filter and three second-order filters, and the first-order filter and the three second-order filters are connected in series. Compared with the prior art, the seven-order Bessel digital filter has the beneficial effects that the seven-order Bessel digital filter has maximum flat group delay and constant group delay, so that a servo motion track keeps a low-frequency track shape in a passband, the impact on a mechanism is small, and a better acceleration and deceleration effect is achieved. Byusing the seven-order Bessel digital filter, the galvanometer position response is fast, and the synchronization with the servo position can be satisfied, so that the whole track is synchronous, andthe processing effect is the best.

A signal processing method, a signal filtering apparatus, and a signal processing apparatus are provided. An input signal may be input into a filter having a passband, a superfluous signal of the passband may be output from the filter, and a target signal may be obtained by subtracting the superfluous signal from the input signal.