3290 results about "High-pass filter" patented technology

An adjustable equalizer that includes a first branch including a low pass filter (LPF) and having a variable gain (β), and a second branch including a high pass filter (HPF) and having another variable gain (α). Outputs of the branches in response to an input signal are summed to produce an equalized output. The equalizer can be implemented using CMOS technology so that the gain parameters β and α are independently adjustable and the equalizer is capable of equalizing an input indicative of data having a maximum data rate of at least 1 Gb/s. Typically, the inventive equalizer is embodied in a receiver for use in equalizing a signal, indicative of video or other data, that has propagated over a serial link to the receiver. In some embodiments useful for equalizing a differential input signal, the equalizer includes two differential pairs of MOS transistors and a controllable current source determines the tail current for each differential pair. The current sources are independently controllable. When the equalizer includes purely resistive impedances Z0 and Z1, the equalizer's transfer function is Z1/Z0.(β+α·(1+s·C0·Z0)), where β is a gain parameter determined by the tail current of one differential pair and α is a gain parameter determined by the tail current of the other differential pair.

A digital camera comprises a solid state imaging device provided with an optical low-pass filter. A photographing optical system forms an object image on a light receiving surface of a CCD through the optical low-pass filter. An electronic-charge accumulation-time control program is stored in a ROM of a system control circuit to determine optimum exposure parameters according to which a photography is performed. The electronic-charge accumulation-time control program has a program diagram showing a relationship between an electronic-charge accumulation-time and an aperture value and/or an ISO speed.