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| Number | Title | Issue Date |
| 6534990 | Voltage regulator wake up control using frequency detection A generator wake-up system that transitions the voltage regulator from a low power, sleep mode to full voltage regulation mode when the wake-up system detects and confirms a valid frequency of rotation of the generator. The wake-up system includes a contr... | 03/18/2003 |
| 6292002 | Crystal resonant frequency sensor A method and apparatus for measuring the frequency of a desired resonant mode of a crystal arrangement, or other two-port device, during an automated operation. The crystal arrangement, or other two-port device, is placed into a test circuit and subjected... | 09/18/2001 |
| 6229316 | Measuring method by spectrum analyzer A spectrum analyzer in which automatic setting of parameters such as band width is done by the analyzer without manual operator input and noise measurements are determined and displayed to the operator. This is accomplished by an input signal being suppli... | 05/08/2001 |
| 6060837 | Method of and apparatus for minimizing plasma instability in an rf processor Variable reactances of a matching network connected between an r.f. source and a plasma load of a vacuum plasma chamber processing a workpiece are varied so a tendency of the plasma to change in an unstable manner which can adversely affect processing of ... | 05/09/2000 |
| 5932998 | System for determining fundamental frequency of an AC signal A system for determining the fundamental frequency of a digitized AC signal is disclosed. Each signal zero crossing is detected, and in response to each zero crossing, two discrete impulses are generated. In response to the train of generated impulses, th... | 08/03/1999 |
| 5861744 | ABS speed signal input filter having mid-frequency attenuation An input filter for a vehicle anti-lock brake system control module has a filter section for attenuating input signals having mid-range frequencies.... | 01/19/1999 |
| 5612617 | Frequency detection circuit A circuit for detecting a particular frequency out of a signal coming in over a telephone line or similar communication path. The circuit has not only a band-pass filter having a frequency band to be detected but also band-pass filters covering frequency ... | 03/18/1997 |
| 4914380 | Signal receiving arrangement A signal receiving arrangement comprising first and second groups (14, 16) of frequency down-converting stages (18 to 24 and 26 to 34), each stage including a mixer (40) and a local oscillator (42) for frequency down-converting a signal applied to the sta... | 04/03/1990 |
| 4810960 | Measuring adjacent channel power A signal source from a transmitter is down-converted by being mixed with a locally generated signal so that a desired adjacent channel band is converted to base band and the adjacent channel power measured after filtering by a low pass filter. To eliminat... | 03/07/1989 |
| 4459542 | Spectrum analyzer having common two-channel filters, especially for voice recognition A spectrum analyzer comprises a plurality of filters each provided with a low-pass output and a high-pass output both having the same cutoff frequency which is different in the case of the different filters. Switching means are provided for periodically c... | 07/10/1984 |
| 4415854 | Microwave spectrum analyzer with a synthesized local oscillator A microwave spectrum analyzer comprising a first mixer which provides beats between the output of an YIG oscillator and the spectrum to be analyzed. A second mixer carries out a fixed transposition of said beats. The said YIG oscillator is locked to harmo... | 11/15/1983 |
| 4037152 | Frequency indicating system Disclosed is an apparatus and process for indicating or measuring the frequency of an incoming signal of unknown frequency. The system includes a plurality of processing channels, each of said channels including a pair of oscillators offset in frequency c... | 07/19/1977 |
| 3965417 | Coherent component magnitude detector The identification of random and coherent components of an unspecified sil wherein at least a pair of band pass filters, each having the same center frequency but different bandwidths, are employed to make the identification.... | 06/22/1976 |
