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| Number | Title | Issue Date |
| 7652527 | Demodulator, diversity receiver, and demodulation method A diversity receiver includes: a plurality of demodulating means for demodulating inputted OFDM signals, to output their demodulated signals; noise component calculating means provided for each demodulating means, for calculating noise components included in the dem... | 01/26/2010 |
| 7339985 | Zero crossing method of symbol rate and timing estimation System and method for analyzing communication signals. A digital signal comprising multiple samples is received, representing a plurality of binary symbols. Zero crossings of the signal are determined, each comprising a respective first sample immediately preceding ... | 03/04/2008 |
| 7200163 | Method of splitting a signal and signal processing circuitry and apparatus utilizing the same A method of splitting a signal (10) into two parts (10″, 10′) is disclosed together with signal processing circuitry (22) for the same. The method comprises the steps of derotating the signal (10) whereby the frequency band of the der... | 04/03/2007 |
| 7167215 | Gain control for a high definition television demodulator A demodulator for a high definition television receiver includes a first circuit element which receives a signal, and is operative in a first arrangement to produce an output signal having a first dynamic range, and operative in a second arrangement to produce an ou... | 01/23/2007 |
| 6968019 | IF FSK receiver In one embodiment, the present invention is a low-power, and high performance receiver including an IF demodulator for high data rate, frequency modulated systems, such as Bluetooth. The IF demodulator is implemented in analog domain for simplicity and lower power c... | 11/22/2005 |
| 6809584 | Signal transmission and receiving methods optimized for integrated circuit implementation A demodulator for demodulating a modulated input signal transmitted at a carrier frequency includes a current mirror for receiving the modulated input signal and generating a first and a second current-mirror output signals of same amplitude and frequency as the mod... | 10/26/2004 |
| 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 |
| 6605989 | FM demodulator using a single input signal A FM demodulator using a single input signal has two I-Q splitters with constant group delay apparatuses. During operation, t two I-Q splitters with constant group delay apparatuses may receive the input modulated signal to generate not only one pair of m... | 08/12/2003 |
| 6573782 | Sigma delta FM ratio detector A circuit (100) for generating a ratio signal indicating a ratio of frequency error to signal magnitude of an input signal includes an FM ratio detector (110) and a sigma-delta analog-to-digital converter (130). The FM ratio detector (110) is responsive t... | 06/03/2003 |
| 6496547 | Digital FM receiver employing combined sample-and-hold and integrate-and-dump detectors for improved bit error rates A narrow-band digital frequency-modulation (FM) limiter-discriminator (LD) receiver with two independent detectors that combine to remove most of the bit errors caused by FM-clicks in an encoded channel. The output of the LD circuit is presented to a samp... | 12/17/2002 |
| 6483381 | Signal transmission and receiving methods optimized for integrated circuit implementation This invention discloses a demodulation method. The method includes steps of: A) Receiving a modulated input signal having an input signal frequency. B) Generating a first switch control signal at a first switching frequency substantially equal to the inp... | 11/19/2002 |
| 6396338 | Variable delay line detector A variable delay line detector (34, 48, 66)includes a power splitter (36, 50, 68), a mixer (44, 62, 72) and a variable delay line (42,52, 70). Various devices are suitable for the variable delay line (42, 52, 70), such as a non-linear transmission line (N... | 05/28/2002 |
| 5826181 | Radio frequency noise reduction arrangement A frequency selective noise reduction circuit and finds application in receiver demodulator arrangements in mobile telecommunication base stations. A receive signal is divided into two paths. One path includes a Phase Lock Loop circuit (PLL) which is empl... | 10/20/1998 |
| 5764704 | DSP implementation of a cellular base station receiver Demodulating FM signals using digital signal processing extracts a carrier signal from digitized channel signals, multiplies the digital channel signal with this extracted carrier signal, and further filters out the carrier signal to produce the demodulat... | 06/09/1998 |
| 5694079 | Digital FM demodulator using a lagrangian interpolation function In a preferred embodiment, an FM demodulator includes an I and Q sampler for generating data samples of I and Q signals of an FM signal. A signal processor derives samples of a modulating waveform of the FM signal from the I and Q data samples, using a La... | 12/02/1997 |
| 5648823 | Circuit configuration for intermediate frequency demodulation and device for video signal processing including the circuit A circuit configuration for intermediate frequency demodulation for a video signal processing device includes an intermediate frequency filter to which an input signal converted to an intermediate frequency is delivered, and a mixer for demodulation with ... | 07/15/1997 |
| 5554955 | Method and apparatus for removing the effects of co-channel interference from the message on a dominant frequency modulated carrier and for recovering the message from each of two co-channel carriers Method and apparatus for improving an estimate of a message being carried by a frequency modulated dominant carrier in the presence of co-channel interference from a subdominant carrier. An envelope detector provides an envelope signal E(t). A frequency d... | 09/10/1996 |
| 5446421 | Local oscillator phase noise cancelling modulation technique A data transmission system includes a source of a data signal and a modulator, responsive to the data signal, producing a first modulated signal representing the data signal and a second modulated signal representing a signal 180 out-of-phase with the dat... | 08/29/1995 |
| 5418489 | Method of recovering a frequency modulated signal An apparatus and method is provided of recovering a frequency modulated signal having a first component of the frequency modulated signal at a zero-RF spectral location and a second component of the frequency modulated signal at a zero-RF spectral locatio... | 05/23/1995 |
| 5414383 | Four quadrant multiplier circuit and a receiver including such a circuit A four quadrant multiplier circuit having a high dynamic range and capable of operating at low voltages includes a dual transconductance amplifier circuit (TAC) consisting of NPN transistors (20 to 23 and 64 to 67), coupled to a first input port (36), fir... | 05/09/1995 |
| 5297136 | Multicarrier demodulator A device in which the frequency band (W) of a multiple carrier signal (MCS) is divided into a number K of sub-bands. The data contained in each sub-band are sampled at a predetermined rate (Sr) to generate a spaced sequence of samples. The data samples fr... | 03/22/1994 |
| 5283531 | Demodulation apparatus incorporating adaptive equalizer for digital communication A demodulation apparatus incorporating an adaptive equalizer, capable of realizing a highly reliable communication, lower power consumption, and a compact size. In the demodulation apparatus, an output of one of two demodulators, at least one of which inc... | 02/01/1994 |
| 5214391 | Demodulation apparatus having multipath detector for selecting a first or second demodulator A demodulation apparatus incorporating an adaptive equalizer, capable of realizing a highly reliable communication, lower power consumption, and a compact size. In the demodulation apparatus, an output of one of two demodulators, at least one of which inc... | 05/25/1993 |
| 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 |
| 5197085 | Radio receiver A receiver for FSK signals produces quadrature related first and second frequency down-converted difference signals (I and Q), which are amplitude limited to form respectively first and second square wave signals. The first and second square wave signals ... | 03/23/1993 |
| 5173927 | Frequency detector system on a digital phase locked loop A frequency detection system is based on a digital phase locked loop, the detection system being especially suitable for use in noisy environments like supervisory audio tone (SAT) detection in AMPS and TACS mobile telephone systems. In addition to the di... | 12/22/1992 |
| 5172070 | Apparatus for digitally demodulating a narrow band modulated signal A digital demodulating apparatus which is high in accuracy in operation and simple in construction. The digital demodulating apparatus comprises an analog to digital converter for converting an input modulated signal having a carrier frequency of fc and a... | 12/15/1992 |
| 5159282 | Demodulation apparatus incorporating adaptive equalizer for digital communication A demodulation apparatus incorporating an adaptive equalizer, capable of realizing a highly reliable communication, lower power consumption, and a compact size. In the demodulation apparatus, an output of one of two demodulators, at least one of which inc... | 10/27/1992 |
| 5157343 | Electronic arrangement for receiving a modulated carrier signal Electronic receive arrangement for receiving a modulated carrier signal, which arrangement comprises a mixer/demodulator driven with the carrier frequency fc, at least one adder included in a closed signal loop, a low-pass filter, and a pulse shaper const... | 10/20/1992 |
| 5138273 | FM demodulator In an FM demodulator which is used in a video tape recorder and in which the linearity of input/output signals is not easily assured to increase a demodulation enable frequency, an FM signal is supplied to the base of a first transistor constituting a fir... | 08/11/1992 |
| 5117440 | Digital quadrature phase detection A system for detecting the phase of a frequency of phase modulated signal that includes digital quadrature sampling of the frequency or phase modulated signal at two times that are one quarter of a cycle of a reference signal apart, determination of the a... | 05/26/1992 |
| 5095536 | Direct conversion receiver with tri-phase architecture A direct conversion receiver having a tri-phase architecture including three separate baseband signal channels. RF communications signals which are being tuned by the receiver are split into three equal and in-phase components which are mixed with three e... | 03/10/1992 |
| 5065409 | FSK discriminator The outputs of two filter channels for accepting two keying frequencies are compared to produce the output. Each channel uses finite impulse response transversal filters; preferably with an impulse response of duration comparable with the symbol period of... | 11/12/1991 |
| 5052050 | Direct conversion FM receiver A direct conversion receiver for demodulating an FM signal converted frequency down converts the signal to quadrature related baseband signals (I,Q). These signals are applied by way of respective d.c. blocking capacitors (16, 18) and differentiating circ... | 09/24/1991 |
| 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 |
| 4985684 | Fully integrated digital FM discriminator A single substantially non-programmable fully integrated circuit for a digital frequency modulated discriminator is provided whereby frequency variations of a digitized frequency modulated information signal are linearly converted to amplitude variations.... | 01/15/1991 |
| 4975653 | FM detector using switched capacitor circuits An integrated circuit FM detector which compensates for variations in semiconductor manufacturing process and temperature employs a pair of serially connected switched capacitor-operational amplifier combinations. The first combination is a frequency to v... | 12/04/1990 |
| 4959620 | Frequency demodulation circuit A frequency demodulation circuit disclosed superposes pulses on an input frequency-modulated (FM) signal at substantially peaks of the FM signal before demodulating the FM signal so that zero cross points of the FM signal can be correctly restored. A peak... | 09/25/1990 |
| 4859957 | Method for demodulating an FM signal A method for demodulating an FM signal (FM=Frequency Modulation), in which the FM signal is directly mixed down into an in-phase and a quadrature component of a complex frequency baseband and a modulation signal is determined from a phase relationship of ... | 08/22/1989 |
| 4835622 | Demodulator arrangement A demodulator arrangement including a phase-locked loop PLL (11) having an output (17) coupled to an input (23) of a hold circuit (24) also includes detection means (27) for detecting an instantaneous interference (FIG. 4b) in the signal present at the in... | 05/30/1989 |
