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| Number | Title | Issue Date |
| 7340011 | Method of frequency multiplication in a radiocommunications apparatus Radiofrequency apparatus and method including at least one transmitter and/or receiver of a useful signal S0, at least one device adapted to the application of a coefficient N to the useful signal S0. The method includes modulating the useful s... | 03/04/2008 |
| 7245655 | Dual antenna receiver Structures and techniques for implementing multiple-antenna configurations within a radio frequency receiver are provided. In one aspect, a modularized multi-antenna receiver is provided having multiple independent microelectronic dice mounted on a common module sub... | 07/17/2007 |
| 7213257 | Determining phase linearity in CATV distribution systems An apparatus for testing the phase linearity of a network comprises a first local oscillator, a first mixer, and a first filter, a second local oscillator, and a second mixer for mixing the first IF to the desired output frequency. The output of the second mixer is ... | 05/01/2007 |
| 6989710 | Binary frequency-shift keying demodulator and frequency-to-voltage converter A BFSK demodulator comprises a three-channel frequency-to-voltage converter, an information signal inputting the first-channel frequency-to-voltage converter, a converted information signal inputting the second-channel frequency-to-voltage converter, wherein outputs... | 01/24/2006 |
| 6480060 | FSK signal demodulating integration-discharge circuit A FSK signal demodulating integration-discharge circuit has a simple circuit configuration and utilizes an AC waveform of the FSK signal as a. control signal for a transistor gate. FSK signals are converted into rectangular-wave signals by the use of a li... | 11/12/2002 |
| 6369647 | Demodulator circuit and method of tuning A demodulator circuit (10) includes an oscillator (12) and an injection circuit (14). An Automatic Frequency Control (AFC) signal adjusts the tail current of a current source (28) provided in the oscillator (12) and the tail current of a current source (4... | 04/09/2002 |
| 6121829 | Frequency demodulator A frequency demodulator of the present invention includes: an amplification section for receiving a frequency-modulated signal and amplifying the frequency-modulated signal based on a gain so as to produce a digital signal having a predetermined level and... | 09/19/2000 |
| 6011816 | Direct demodulation method and apparatus A demodulation circuit providing for detection of multiple zero-crossings in an FSK signal. High data rate signals are demodulated by generating, for each pair of baseband signals I and Q, additional I and Q pairs which are phase shifted from the original... | 01/04/2000 |
| 5999577 | Clock reproducing circuit for packet FSK signal receiver A circuit is provided by which in the case of the transmission of a short packet signal through an FSK transmission channel having a frequency error for transmission and reception, directly from one shaped rectangular pulse of a frequency detected bit syn... | 12/07/1999 |
| 5790032 | Method of and apparatus for detecting living bodies An apparatus detects living bodies, in particular human living bodies, by ectromagnetic signals. The apparatus has a receiver device for electromagnetic signals that includes a device for obtaining frequency components that are characteristic in respect t... | 08/04/1998 |
| 5606581 | Method and apparatus for the cancellation of interference in electrical systems A cancellation circuit is provided where one demodulator circuit provides a demodulated output having interference voltage owing to interference between carrier signals, between a carrier signal and noise, or a combination of both. Cancellation of interfe... | 02/25/1997 |
| 5453714 | Binary FM demodulator with self-adjusting resonant operating frequency according to demodulated binary output signal duty cycle A demodulator for demodulating a binary frequency-modulated signal includes a demodulator with a quadrature tank circuit and a duty cycle monitor circuit. The quadrature tank circuit has a voltage-controllable resonant frequency for compensating for shift... | 09/26/1995 |
| 5339333 | FSK demodulator using signal transitions An FSK demodulator is provided comprising means for receiving and digitizing an FSK signal (such as a signal comprising two frequencies f1 and f2 in which first and second logic states are represented by first and second periods of different durations). F... | 08/16/1994 |
| 4814717 | FSK frequency discriminator for a coherent optical transmission system A frequency discriminator for an optical coherent transmission system, wherein FSK signals having the frequencies F(1) and F(2) are processed. The discriminator comprises a first series arrangement of a differential stage, a filter and a full-wave rectifi... | 03/21/1989 |
| 4585998 | Method and device for coherent demodulation of a digitally modulated carrier A digitally modulated carrier modulated by phase shift keying or frequency shift keying with phase continuity, transmitted as useful bursts distributed at equal time intervals with phase continuity from each burst to the next burst. The carrier frequency ... | 04/29/1986 |
| 4568882 | Digital FSK demodulator circuit An FSK demodulator is disclosed suitable for use in a CMOS IC using switched capacitor circuits. The mark and space filters are each modified to produce sine and cosine outputs. These outputs are rectified separately and the result summed. The summed outp... | 02/04/1986 |
| 4471312 | Integrated circuit demodulator for FSK signals An integrated circuit demodulator receives an alternating signal at a first frequency and an alternating signal at a second frequency and provides a binary output corresponding to the first and second frequencies. An input signal is received by a first an... | 09/11/1984 |
| 3980961 | Frequency demodulator for a FSK data transmission system Frequency demodulator for a frequency-shift-keying data transmission system, which demodulator comprises, in cascade, a monostable circuit, a lowpass filter and a voltage comparator to which a threshold voltage is applied. The demodulator further comprise... | 09/14/1976 |
