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| Number | Title | Issue Date |
| 8159291 | AM (amplitude modulation) demodulation system for RFID reader device An RFID reader device (31), of the type comprising a demodulator (6) for receiving from a RFID tag (11) an AM (Amplitude Modulation) wave (20) having a predetermined frequency (f) and for retrieving, from the AM wave (20), a demodu... | 04/17/2012 |
| 7791409 | AM (amplitude modulation) demodulation system for RFID reader device AM (Amplitude Modulation) demodulation system (36) for an RFID reader device (31), of the type comprising a demodulator (6) for receiving from a RFID tag (11) an AM (Amplitude Modulation) wave (20) having a predetermined frequency ... | 09/07/2010 |
| 7535291 | AM demodulator An amplitude modulation receiver including an antenna for receiving a signal and an input filter connected to the antenna. A variable gain amplifier is connected to the input filter and is responsive to a gain control signal. An A/D converter is connected to the var... | 05/19/2009 |
| 7123176 | Digital peak detector with noise threshold and method A circuit and method for processing digitized analog signals (“input signals”) containing noise as well as maxima and minima of input signal, whereby local peaks and valleys of the input signal are detected and captured in the presence of the noise, and whereby ... | 10/17/2006 |
| 6897719 | Demodulation circuit and demodulation method Two capacitors are provided for demodulating an amplitude-modulated signal and can be supplied with a signal that is rectified by a diode and that is at a voltage. The half-cycles of this signal are used for alternately charging the first or second capacitor using a... | 05/24/2005 |
| 6721371 | One sample per symbol high rate programmable parallel architecture for digital demodulation A high speed demodulator system is comprised of an analog to digital converter (ADC); a high speed demultiplexer connected to an input of the ADC; a bank of parallel programmable demodulators connected to an output of the high speed demultiplexer; a timing interface... | 04/13/2004 |
| 6535560 | Coherent adaptive calibration system and method A receiver is adaptively calibrated by using a coherent reference signal. The reference signal is selected to be offset from a center frequency of the calibration signal such that the resultant product is offset from baseband by some small amount. The res... | 03/18/2003 |
| 5942937 | Signal detection circuit using a plurality of delay stages with edge detection logic A signal detection circuit employs a delay line with edge detection logic for capturing and buffering timing information about an input signal. A plurality of comparators for comparing the input signal to different reference potentials capture amplitude i... | 08/24/1999 |
| 5825242 | Modulator/demodulator using baseband filtering A modulation and demodulation scheme for video signals may be used for HDTV signals using VSB-PAM, analog NTSC signals using VSB-AM and digital video signals using QAM. VSB-PAM modulation and demodulation may be performed using in-phase and quadrature bas... | 10/20/1998 |
| 5724002 | Envelope detector including sample-and-hold circuit controlled by preceding carrier pulse peak(s) A sampling synchronous envelope detector adopts a specialized sample-and-hold ("S&H") approach, basing a detected output on instantaneous values of the carrier waveform which are sampled at specially chosen instants. Non-linear distortion is avoided by ti... | 03/03/1998 |
| 5563550 | Recovery of data from amplitude modulated signals with self-coherent demodulation A demodulation system extracts data from an input amplitude modulated signal electromagnetic wave with a signal multiplying means that has two input terminals both of which are coupled to receive the input amplitude modulated signal. An output terminal of... | 10/08/1996 |
| 5446771 | Adaptive coherent signal detection method and apparatus A detector (100) determines whether an input signal (10) comprises a first signal or a second signal. A first local signal (207) is generated based on the first signal and a second local signal (307)is generated based on the second signal. A first error (... | 08/29/1995 |
| 5379456 | Multiplying saw phase shift envelope detector A radio-frequency detection apparatus including a signal input for providing an input signal and a phase shifter having a first connection and a second connection. The phase shifter includes a SAW device having a first electrical connection and a second e... | 01/03/1995 |
| 5339040 | AM demodulation receiver using digital signal processor An amplitude modulated (AM) radio receiver uses a digital signal processor, responsive to in-phase (I) and quadrature-phase (Q) component signals, to compensate for carrier energy removed by a capacitive coupling circuit. A quadrature mixer converts the r... | 08/16/1994 |
| 5206601 | Order statistic signal processor for estimating values of signal parameters and demodulating amplitude-, phase-, and frequency-modulated signals The order statistic signal processor obtains continuing estimates of amplitude, phase, or frequency of an input signal based on order statistics. By way of definition, the P'th order statistic for a set of samples from a continuously distributed process i... | 04/27/1993 |
| 5179731 | Frequency conversion circuit A circuit array for frequency translation by means of quadrature heterodyne signals has very low quadrature errors even at very high frequencies and is monolithically integratable with little external circuitry. The circuit array includes a first mixer wh... | 01/12/1993 |
| 5097222 | Digital analog signal demodulator There is disclosed a system and method for demodulating an analog signal using digital conversion of the analog signal. In one embodiment the incoming modulated signal is digitally sampled and a calculation is made as to both the short term and long term ... | 03/17/1992 |
| 4989219 | Midlevel carrier modulation and demodulation techniques Several techniques are disclosed for producing modulation of a carrier signal wherein each transition of the modulated carrier signal includes a midrange level and/or two midrange characteristics, the level and/or ratio of the two midrange characteristics... | 01/29/1991 |
| 4973914 | Digitized synchronous demodulator A digitized synchronous demodulator is constructed entirely of digital components including timing logic, an accumulator, and means to digitally filter the digital output signal. Indirectly, it accepts, at its input, periodic analog signals which are conv... | 11/27/1990 |
| 4955039 | Quadrature receiver A quadrature receiver is disclosed which contains two mixers (M1, M3) in an in-phase receiving path and two mixers (M2, M4) in a quadrature receiving path for converting a received signal to a low IF. Each of the mixers is fed with an oscillator signal (O... | 09/04/1990 |
| 4945313 | Synchronous demodulator having automatically tuned band-pass filter In a synchronous demodulator for demodulating a carrier signal modulated with a useful signal, the demodulator including a filter circuit (2) for selecting the carrier signal, a limiter (3) for generating an amplitude-limited reference signal from the car... | 07/31/1990 |
| 4943982 | Baseband carrier phase corrector A baseband carrier phase corrector is disclosed which permits rapid demodulation and demodulation of varying RF input signals. The baseband carrier phase corrector receives RF signals, or alternatively, IF signals, and converts the signals to baseband. An... | 07/24/1990 |
| 4929905 | Synchronous demodulation circuit for a carrier-modulated television signal In a synchronous demodulation circuit for an IF television signal, having a passive carrier regenerator (37, 39), a quadrature component unwantedly demodulated by a synchronous in-phase demodulator (15) is compensated for by multiplying the output signal ... | 05/29/1990 |
| 4857859 | AM digital demodulator An AM demodulator of a digital signal processing type wherein an analog AM signal is converted to a digital AM signal, the digital AM signal is squared and a one sample-delayed version of the digital AM signal is squared, these squared signals are added, ... | 08/15/1989 |
| 4833340 | Phase shifter A phase shifter includes two phase shift circuits connected in parallel with each other between an input terminal for a signal of a voltage ei and ground and each consisting of a series circuit of a resistor and a capacitor, first and second di... | 05/23/1989 |
| 4769613 | Digitalized amplitude detection circuit for analog input signal A digitalized detection circuit as an envelope detector of an analog input signal is disclosed. This circuit includes an analog-to-digital converter converting the analog input signal into first digital data, storing means for storing second digital data ... | 09/06/1988 |
| 3990016 | Asynchronous demodulator Phase detectors in quadrature whose outputs are simultaneously coupled to: high pass networks and cross coupled multipliers with the output summed to produce a signal proportional to the frequency difference of the signals applied to the aforesaid phase d... | 11/02/1976 |
