摘要:
The present invention relates to nonlinear signal processing, and, in particular, to adaptive nonlinear filtering of real-, complex-, and vector-valued signals utilizing analog Nonlinear Differential Limiters (NDLs), and to adaptive real-time signal conditioning, processing, analysis, quantification, comparison, and control. More generally, this invention relates to methods, processes and apparatus for real-time measuring and analysis of variables, and to generic measurement systems and processes. This invention also relates to methods and corresponding apparatus for measuring which extend to different applications and provide results other than instantaneous values of variables. The invention further relates to post-processing analysis of measured variables and to statistical analysis. The NDL-based filtering method and apparatus enable improvements in the overall properties of electronic devices including, but not limited to, improvements in performance, reduction in size, weight, cost, and power consumption, and, in particular for wireless devices, NDLs enable improvements in spectrum usage efficiency.
摘要:
A neural net, and method of using the net, to solve ill-posed problems, such as deconvolution in the presence of noise. The net is of the Tank-Hopfield kind, in which input to the signal net is a cross entropy regularizer.
摘要:
A signal processor for detecting the presence of two signals whose over-all phase or frequency is related by a known rational number. The first signal of frequency .omega.M is raised to the N.sup.th power, while the second signal of frequency .omega.N is raised to the M.sup.th power. The two raised signals are then correlated, energy detected, and compared against a predetermined threshold to provide an indication when both signals are present. By utilizing the known frequency relationship between the two signals the processor yields enhanced detection performance over that achievable by detection of each signal separately.
摘要:
A low offset field effect transistor correlator circuit where one signal is applied to a balanced input through capacitors to the drain and source electrodes of a field effect transistor and having a second signal applied to the gate of the transistor. Low pass filters are connected to the source and drain, and the correlated input signals appear across resistors connecting the outputs of the filters.
摘要:
A low offset AC correlator avoids DC offset and low frequency noise by frequency operating the correlation signal so that low noise, low level AC amplification can be substituted for DC amplification. Subsequently, the high level AC signal is demodulated to a DC level.
摘要:
Apparatus for improving the signal to noise ratio in an electrical signal. A signal enhancement processor operating in real time and selecting signals based upon the similarity of the incoming signal to a locally generated reference and which does not require that signals be filterable in the frequency domain, that external reference signals be supplied, or that signal amplitude criteria be employed. A system for providing input signal attenuation or rejection as a function of the frequency or phase of the input signal, with attenuation at a maximum for an undesired signal and at a minimum for a desired signal.
摘要:
The method consists of deriving a coherence measure from selected related traces of a seismic cross-section, and thereafter weighting individual or selected ones of the seismic traces in accordance with such time-analogue coherence quotient. Apparatus for carrying out the method may consist of structure for imposing predetermined delay between each pair of a group of selected seismic traces with subsequent summation, multiplication and integration over a time period to provide a first integrated output; and each trace pair is then subjected to one or more other predetermined, different delays with respective outputs applied to the multiplier and integrator circuitry thereby to generate additional integrated outputs. All integrated outputs for each trace pair are then applied through sample and hold circuitry to select a time-varying maximum voltage signal for output as a coherence quotient signal. Thereafter, the coherence quotient signals for each trace pair are combined to form a signal of time-varying character which is employed to control signal gain through duration of selected seismic trace signals thereby to selectively allow passage or to suppress in varying degrees the final output signal indications.
摘要:
A method of testing a moving strip of material, wherein the density of the strip is measured at two successive places, the instant measurement signal obtained at the first place is multiplied by a factor which is proportional to the instant value of the measurement signal at the second place, and the average value of the resultant product signal is determined.
摘要:
The present invention relates to a method of phase integration, and an electronic integrator-phasemeter for the application of this method as well as their applications, especially to an electronic correlator intended for the study of narrow band background noises, particularly utilizing the method disclosed in my copending application Ser. No. 847,477 filed Oct. 20, 1959.
摘要:
Seismic traces are weighted and stacked to produce an estimated output trace having improved signal-to-noise ratio. Those traces having the highest signal-to-noise ratio are weighted more heavily. The weights for each trace are determined from a detection of the signal between the estimated output trace and each of the seismic traces. The procedure is iterated so that the signal-to-noise ratio of the estimated output trace is progressively improved by recomputing the weights of the individual traces on each pass.