Did You Know...
...that Kleenex tissue was originally designed to be a gas mask filter? It was developed at the beginning of World War I to replace cotton, which was then in short supply as a surgical dressing.
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| Number | Title | Issue Date |
| 7729673 | Method and apparatus for multichannel signal limiting A method and apparatus provide multichannel signal limiting to prevent any channel signal within a multichannel signal from exceeding defined limits, while still preserving the gain and/or amplitude relationships among the individual channel signals. A limiter is co... | 06/01/2010 |
| 7343137 | Circuit, switching module comprising the same, and use of said switching module The invention relates to a circuit comprising an antenna input (1), a signal input (2) and a signal output (3), and a switching unit (4), wherein the antenna input (1) is connected to a first protection device (6) against el... | 03/11/2008 |
| 7224749 | Method and apparatus for reducing re-radiation using techniques of universal frequency translation technology Methods, systems, and apparatuses for down-converting an electromagnetic (EM) signal by aliasing the EM signal, and applications thereof are described herein. Reducing or eliminating DC offset voltages and re-radiation generated when down-converting an electromagnet... | 05/29/2007 |
| 6018543 | Noisy channel avoidance method in a digital communication system There is disclosed in a frequency hopping digital communication network having a multimode radio transmitter for transmitting a data signal and a multimode radio receiver tuned for receiving the same, the multimode transmitter and receiver operable in a f... | 01/25/2000 |
| 5914544 | High-frequency switching circuit The present invention relates to a high-frequency switching circuit, and provides a high-frequency switching circuit capable of withstanding high output power, achieving highly efficient isolation, and reducing an insertion loss using inexpensive pin diod... | 06/22/1999 |
| 5774799 | Automatic frequency control with adjacent channel interference protection A robust automatic frequency control (AFC) loop for use in radio frequency systems performs a threshold test on the accumulated error adjustments for controlling a frequency oscillator. Based on this test, the loop adjusts the value contained in the error... | 06/30/1998 |
| 5497128 | Local oscillator system and frequency switching method for minimizing spurious components A local oscillator system carries out a frequency switching method, in which local signals with fewer spurious components can be obtained. The local oscillator system is provided with frequency generators for generating signals with different frequencies ... | 03/05/1996 |
| 4370629 | Voltage controlled oscillator with reduced number of tuning potentiometers A VCO (Voltage Controlled Oscillator) is provided with a full set of tuning voltages from a reduced number of reference voltage sources, such as potentiometers. Logic controlled switch means delivers any of the reference voltages individually or predeterm... | 01/25/1983 |
| 4305158 | Television tuner A television tuner comprises a high frequency amplifier for receiving a high frequency signal received by an antenna, a local oscillator, and a mixer for mixing the high frequency signal from the high frequency amplifier and the oscillation frequency sign... | 12/08/1981 |
| 4247952 | Signal receiving apparatus Improvements in signal receiving apparatus of the type including a tuning stage having a presettable channel selecting storage device for storing selected channel identity signals representing predetermined channels to which the tuning stage is tunable an... | 01/27/1981 |
| 4020419 | Electronic system for automatically tuning to a selected television channel An all electronic tuning system is described for establishing a frequency of a local oscillator in a television receiver. When a channel selection is made, a number representing the desired channel is entered in a memory circuit. A first plurality of freq... | 04/26/1977 |
| 3958180 | Varactor tuner frequency controller A varactor tuner frequency controller wherein a tuning voltage is developed for optimumly tuning a VHF tuner or a UHF tuner to any one of a plurality of channels. A capacitor utilized to store charge for developing the tuning voltage is discharged by mean... | 05/18/1976 |
