Class 329/321 - Using amplitude limiting within the demodulator

Subclass of Class 329 - Demodulators
Definition: Subject matter which restricts the magnitude of signal fluctuations
No. of patents: 35
Last issue date: 03/04/2008

Number	Title	Issue Date
7339809	Systems and methods for electrical power regulation and distribution in aircraft The present invention comprises systems and methods for electrical power regulation and distribution. In an embodiment, a system includes a modulator coupled to the source that receives an unregulated output waveform and is operable to produce a first composite wave...	03/04/2008
6822508	Communication device, communication method, program, and storage medium A high-performance demodulator for use in UWB (Ultra WideBand) multiple-access communication is disclosed. In a communication device, the correlation between a received signal corresponding to signals transmitted from a plurality of communication terminals by means ...	11/23/2004
6664849	Digital FM demodulator performing amplitude compensation A digital FM demodulator converts a digital FM input signal to a demodulated signal, detects the amplitude of the digital FM input signal, generates a corresponding amplitude signal, and adjusts the amplitude of the demodulated signal according to the amp...	12/16/2003
6546237	Differential FM detector for radio receivers A differential FM detection of signals uses in-phase and quadrature phase signal components of a received signal in the detection process, wherein the in-phase and quadrature phase signal components are at a low intermediate frequency (IF). The in-phase a...	04/08/2003
6160444	Demodulation of FM audio carrier A method of demodulating an FM carrier wave and an FM demodulation circuit are described which use a phase locked loop. The phase locked loop is tuned to a selected carrier wave frequency including the step of selecting a setting of the variable gain circ...	12/12/2000
6020784	FM demodulation circuit An FM demodulation circuit includes a phase conversion circuit which converts a frequency variation of an input signal into a phase variation and has a variable conversion characteristic, and a control current source circuit which outputs, when the level ...	02/01/2000
6008693	FM-sound demodulator for TV sound signals and method of detecting sound carriers For a possible simple structure, dispensing with ceramic filters, an FM demodulator for demodulating sound-FM signals comprises a controllable amplifier (1) which receives the sound signals converted to intermediate frequencies, said amplifier having a ga...	12/28/1999
5937017	Complex signal limiting Each complex signal sample a(k)+jb(k) of a frequency modulated signal is limited in order to reduce co-channel interference. The limiting is performed efficiently in a digital signal processor by determining a ratio r with a magnitude less than one, equal...	08/10/1999
5778310	Co-channel interference reduction Co-channel interference of a frequency modulated signal represented by complex signal samples is reduced by amplitude limiting each sample and non-linearly filtering the limited samples. The non-linear filter low pass filters the limited samples, multipli...	07/07/1998
5740207	Complex signal limiting Each complex signal sample a(k)+jb(k) of a frequency modulated signal is limited in order to reduce co-channel interference. The limiting is performed efficiently in a digital signal processor by determining a ratio r with a magnitude less than one, equal...	04/14/1998
5631601	FM demodulation with a variable gain phase locked loop A method of demodulating an FM carrier wave and an FM demodulation circuit are described which use a phase locked loop. An FM input signal including the carrier wave is supplied to a phase detector in the phase locked loop. The output of the phase detecto...	05/20/1997
5412692	Data slicer A data slicer follows abrupt variations in level of the detection signal. The data slicer for converting a detection signal into a digital signal in a data transmission system includes a maximum value detecting section, a minimum value detecting section, ...	05/02/1995
5341107	FM quadrature demodulator with two phase comparison circuits FM quadrature demodulator having in-phase and quadrature terminals for applying a pair of FM-modulated signals in a mutual phase quadrature thereto, having a modulation signal which is frequency-modulated on a carrier, one of the two terminals being coupl...	08/23/1994
5333150	Demodulation and synchronization method and system for digitally modulated signals A digitally modulated signal of the FSK type is subjected to limiting and linear FM demodulation to produce a baseband signal which often fails to show clearly the serial binary digital signal because of distortion and disturbances prior to its reception....	07/26/1994
5329242	Method and apparatus for signal demodulation using time-intervals Method and apparatus for recovering a message signal from a carrier signal. More specifically, method and apparatus for demodulating a frequency modulated signal using measured time intervals between zero-crossings of a received carrier signal. The method...	07/12/1994
5272448	Method and apparatus to perform digital demodulation by measuring periods between zero crossings A digital demodulator provides efficient demodulation of frequency modulated, pulse-width modulated, and other temporally modulated signals. Without employing an analog-to-digital converter, modulating signal information is extracted from a modulated sign...	12/21/1993
5239273	Digital demodualtor using signal processor to evaluate period measurements A digital demodulator provides efficient demodulation of frequency modulated, pulse-width modulated, and other temporally modulated signals. Without employing an analog-to-digital converter, modulating signal information is extracted from a modulated sign...	08/24/1993
5166633	Angle modulation dectector An angle modulation detector which prevents a demodulated output from being influenced by fluctuations in the amplitudes of signals generated from angle-modulated signal sources such as a phase-modulated signal and a frequency-modulated signal, even if th...	11/24/1992
5159281	Digital demodulator using numerical processor to evaluate period measurements A digital demodulator provides efficient demodulation of frequency modulated, pulse-width modulated, and other temporally modulated signals. Without employing an analog-to-digital converter, modulating signal information is extracted from a modulated sign...	10/27/1992
5015961	Frequency shift demodulator The invention improves the ability of the FS demodulator-circuit of an FS digital transmission system so as to withstand noise with low error count. The invention uses two different types of all pass networks and a phase measuring circuit to average rando...	05/14/1991
4992748	Period-inverting FM demodulator An FM discriminator (34) which independently recovers modulating information from each half-cycle of a modulated waveform (16) is disclosed. The discriminator (34) includes a comparison circuit (36-42, 80-82) which produces bipolar signals describing posi...	02/12/1991
4897608	Circuit arrangement for frequency-modulated picture signals A circuit arrangement for a picture reproducing apparatus having an amplitude limited (7), to which a frequency-modulated picture signal is applied and whose output is coupled to a frequency demodulator (8, 9). The output signal of the amplitude limiter (...	01/30/1990
4731872	FM TVRO receiver with improved oscillating limiter An improved FM receiver is disclosed incorporating improved oscillating limiter circuitry having an electrically tunable bandpass filter which is phase modulated by the baseband signal the phase of which has been advanced in accordance with the formula: ...	03/15/1988
4679247	FM receiver An improved FM receiver is disclosed incorporating improved oscillating limiter circuitry having an electrically tunable bandpass filter and variable attenuator in regenerative feedback relationship around the limiter. The electrically tunable bandpass fi...	07/07/1987
4673898	Wide band quadrature hybrid A system for providing a quadrature hybrid with a wide bandwidth and an extremely low amplitude imbalance. This system incorporates conventional quadrature hybrids as components and provide a system quadrature hybrid having a larger bandwidth and a far lo...	06/16/1987
4450590	Discriminator circuit for frequency modulation receivers A frequency modulation receiver uses a low intermediate frequency (IF) signal for good image frequency rejection. The intermediate frequency signal is discriminated (or demodulated) after amplitude limiting the intermediate frequency signal by doubling th...	05/22/1984
4442549	Meter drive circuit A circuit and method for producing a signal the magnitude of which varies with the logarithm of an input signal supplied to a plurality of cascaded differential amplifier stages each having substantially equal gain. As particular ones of the stages go int...	04/10/1984
4317210	Coherent receiver for angle-modulated data signals A receiver for angle-modulated signals of the type a sin((ω)t+$c;(t)), comprising a frequency transposition stage (3) incorporating a local oscillator (3-1). A frequency shift Ɗω of the local oscillator relative to the carrier frequency ω may ...	02/23/1982
4266296	Multipath distortion compensation circuit and method A multipath distortion compensation circuit comprises an FM detector, an AGC circuit, an envelope detector, a capacitor, a function generator, an analog multiplier, first and second operational circuits, first and second variable delay circuits, and a plu...	05/05/1981
4263554	Frequency discriminator apparatus A frequency discriminator having at least one ferrimagnetic resonator in a band pass or band reject configuration, the frequency of which is swept over a frequency band of interest, a detector receives the filter output, and the timing relationship betwee...	04/21/1981
4256975	Limiter circuit for removing nose from demodulated signals A diode limiter circuit comprising a low-pass filter for suppressing noise pulses superposed on a demodulated signal and for passing only the noise-suppressed demodulated signal, and a circuit means including limiter diodes whose conduction starting level...	03/17/1981
4101837	Threshold extension FM demodulator apparatus for wide band width FM signals A tunable oscillating limiter threshold extension demodulator capable of demodulating video and other wide band width FM signals is described. A steering signal is generated to tune the oscillating limiter in response to the video output signals from an F...	07/18/1978
4035730	FM noise threshold extension demodulator apparatus Apparatus for lowering the noise threshold at which FM and other angle modulated signals may be demodulated is described wherein an oscillating limiter provided by an amplitude limiter having a bandpass filter in regenerative feedback relationship therewi...	07/12/1977
4031483	Limiter circuit for servosystems A limiter circuit is installed in a servomechanism that establishes a signal at the output terminal of a filter contained therein, in the absence of an input signal within the lock range of the servomechanism, in a manner that maintains the charge on the ...	06/21/1977
3971997	Sea spike suppression technique A technique for detecting and eliminating "sea-spike" interference in a rrn radar-signal. A series of signal delay means in cooperation with associated subtractors are utilized to detect particular sea-spike modulation interference frequencies. Detection...	07/27/1976

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Class 329/321 - Using amplitude limiting within the demodulator