An adaptive filter circuit using a time modulated dead band for suppressing the effects of spurious noise associated with an error signal used in controlling a position drive motor associated with process controlling elements. The circuit includes means for restricting all signals, including both control signals and spurious noise, to a positioning motor during those periods of operation when little positioning is required. However, in those instances where a relatively large amount of repositio...

An adaptive illuminator is disclosed for an active range gated imaging system, designed to operate at small slant angles, when carried in an aircraft or on the mast of a ship or land based observation port. Active TV operation at small depression angles creates an elongated profile of illumination on horizontal terrain. In normal operation, using wide range-gating pulses to the camera, the foreground of the profile is over-illuminated while the background is under illuminated creating poor image...

An adaptive filter for attenuating signal components in a frequency band having independently variable band width and center frequency while introducing minimum phase shift and time delay into the signal components outside the frequency band. The adaptive filter comprises a series of variable notch filters and means for independently controlling the center frequencies of the notch filters in accordance with a predetermined parameter of the output signal from the last filter. Also disclosed is a ...

An adaptive signal weighting filter for use in a compander performs a frequency response weighting function so that during the encoding process the spectral region of dominant signal energy of the program signal is preemphasized with respect to other spectral regions and during the decoding process the corresponding spectral regions of the encoded signal are deemphasized with respect to one another in a complementary manner.

An adaptive equalizer for improving the quality of digital data contained in an electrical input signal supplied to the equalizer. The equalizer compensates for amplitude and delay distortion affecting the quality of the digital data contained in the electrical input signal. The equalizer includes a delay line having a plurality of discrete time delay elements and in a plurality of taps coupled to the delay elements. A clock circuit provides a plurality of clock signals of identical frequency bu...

An adaptive or self-adjusting corrector is provided for the correction or equalization of data signals formed with the primary value and a plurality of prior and subsequent oscillations. A plurality of delay members are provided for delaying the data signals. Members for multiplying the data signals by alterable coefficients are provided at outputs of each of the delay members. At least one adder connects with the coefficient members for summing up the multiplied data signals. Either a first coe...

Methods and apparatus for adaptively controlling a machine tool to provide optimized instantaneous performance as unforeseen or unforeseeable changes in cutting conditions occur; --characterized by a continuous search out of and back into a permissible area defined by constraint boundaries in the cutter speed vs. feed rate (V vs. R) plane. The method and apparatus always adjust the cutter speed and feed rate to conditions of optimized economic operation (e.g., minimum cost or minimum time)--but ...

An adaptive detector comprises an adaptive linear prediction filter (ALPF) nd a detection processor. The adaptive filter comprises an input filter, adapted to receive an input signal x(k) and delay it by a time .DELTA.. An L-point, or L-tap, adaptive filter has an input connected to the output of the input filter, a signal r(k) appearing at the output of the filter. A means for summing has two inputs, one for receiving the signal x(k) and the other for receiving an inverted signal from the adapt...

Adaptive coding method and apparatus in which the speed at which the coder transitions between different codes to perform bit generation is adapted, or adjusted, while coding the data to arrive at a point where the initial bits of the outputs include zeros and ones occurring equally often.

An adaptive data compression device for compressing data having variable frequency content, including a plurality of digital filters for analyzing the content of the data over a plurality of frequency regions, a memory, and a control logic circuit for generating a variable rate memory clock corresponding to the analyzed frequency content of the data in the frequency region and for clocking the data into the memory in response to the variable rate memory clock.