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| Number | Title | Issue Date |
| 7983639 | RF filter and digital broadcast receiving tuner and RF signal processing device using RF filter A radio frequency (RF) filter is provided which includes a band pass filter unit and an amplifying unit. If a signal having a frequency in a first band is input, the RF filter performs band pass filtering, and if a signal having a frequency in a second band is input... | 07/19/2011 |
| 7689189 | Circuit and method for signal reception using a low intermediate frequency reception A method and circuit for receiving a radio frequency signal by receiving and amplifying the radio frequency signal to produce a received signal and generating first and second clock signals corresponding to first and second channel signals, respectively, of the rece... | 03/30/2010 |
| 7519342 | Tunable tracking filter An integrated tuner circuit has an arbitrary IF (intermediate frequency) output. The tuner includes an integrated circuit with a fixed-frequency control loop and a matched external variable capacitance Ct, to achieve tracking of a tuned LC band-pass filte... | 04/14/2009 |
| 7444129 | Comb-line wireless filter A comb-line wireless filter (5) includes an input end (505a), an output end (505b), a first transmission line (501b), a second and third transmission line (501a, 501c) each having a curved ... | 10/28/2008 |
| 7352911 | Method for bilateral filtering of digital images A method for processing an image using a bilateral filter. The bilateral filter is reformulated at each pixel location in the image into a sum of the original signal value of a central pixel at said pixel location and a bilateral correction term which is a function ... | 04/01/2008 |
| 7319797 | Adaptive filters and apparatus, methods, and systems for image processing An adaptive filter according to one embodiment includes an N×N two-dimensional convolution, where N is an odd integer greater than one. Pixels of an image are filtered by moving the N×N kernel across the image. At each pixel location, the kernel coefficients are d... | 01/15/2008 |
| 7266351 | Transconductance / C complex band-pass filter A complex filter such as the channel select filter in a radio transceiver is implemented using a transconductance/C topology to benefit from the ability to tune such filters and thereby stabilize the output transfer function of the filter over variations in temperat... | 09/04/2007 |
| 7254200 | System and method for frequency burst detection for GSM/GPRS A system, method and computer program product for detecting a frequency burst in a received signal at a wireless receiver is disclosed. The invention predicts the current sample of the received signal by filtering the past samples of the received signal through an a... | 08/07/2007 |
| 7239710 | Stereo radio receiver with noise suppression For the purpose of largely suppressing the noise pulses caused in a stereo radio receiver in the reception signal, particularly by the ignition system of a motor vehicle, a digital field strength signal representing the analog field strength signal is produced for e... | 07/03/2007 |
| 7180933 | Squelch circuitry for high speed high frequency operation A squelch circuit for operating at high speed and at high frequencies includes a squelch input unit, a low swing pre-amplifier and a sampling and decision circuit. The squelch input unit pre-processes the positive and negative signals of an input signal to generate ... | 02/20/2007 |
| 7181187 | RF transmitter having improved out of band attenuation A radio frequency transmitter includes a digital baseband and coding module, an inverse fast Fourier transform (IFFT) module, a complex digital filter, a complex digital-to-analog converter and a radio frequency modulation module. The digital baseband and coding mod... | 02/20/2007 |
| 7155164 | Method and apparatus for performing transmit pre-emphasis A pre-emphasis circuit and methods are provided. The circuit includes a first amplifier and a second amplifier. The first amplifier is operable to amplify a signal using a first amplifier current, and the second amplifier is operable to amplify a delayed version of ... | 12/26/2006 |
| 7142836 | Microwave filter distributed on circuit board of wireless communication product The present invention is to provide a microwave filter distributed on a circuit board of a wireless communication product, which comprises an input terminal, a resonant chamber of double frequencies, and an output terminal of the microwave filter directly distribute... | 11/28/2006 |
| 7130605 | Method and device for synchronization and cancellation of a plurality on interfering signals in radio transmission with frequency reuse A method is provided for realizing, in a radio transmission system, a carrier synchronization and for cancelling one or more co-channel interfering signals from a received main signal, in which a synchronous down-conversion of the received main signal and of each of... | 10/31/2006 |
| 7103334 | Method and system for tuning quality factor in high-Q, high-frequency filters A method for tuning quality factor (Q) in a high-Q, high-frequency filter is provided that includes filtering an input signal to generate a filtered signal. The input signal comprises a specified frequency. The filtered signal comprises an actual phase shift with re... | 09/05/2006 |
| 7099289 | Automatic retransmission and error recovery for packet oriented point-to-multipoint communication Point to multipoint wireless communication, including automatic retransmission and error recovery for packet oriented point to multipoint communication, which integrates adaptive and dynamic responsiveness for parameters for automatic retransmission using wireless c... | 08/29/2006 |
| 7054606 | Digitally calibrated narrowband filter with analog channel compensation An apparatus comprising a first circuit, a second circuit and a third circuit. The first circuit may be configured to filter an analog input signal in an analog domain in response to one or more control signals. The second circuit may be configured to convert the an... | 05/30/2006 |
| 7054610 | Wireless terminal device In a cellular telephone provided with a receiving circuit of a direct conversion type, a passive low-pass filter is arranged between a mixer for an I-channel and a base band circuit for removing interference waves of or above a channel next to a channel neighboring ... | 05/30/2006 |
| 7020448 | Method for detecting a tone signal through digital signal processing A method for detecting a tone signal having a predetermined tone frequency includes receiving an analog communication signal, using a sampling frequency to convert the analog communication signal into a digital communication signal, selecting a plurality of signal s... | 03/28/2006 |
| 7002403 | Transconductance/C complex band-pass filter A complex filter such as the channel select filter in a radio transceiver is implemented using a transconductance/C topology to benefit from the ability to tune such filters and thereby stabilize the output transfer function of the filter over variations in temperat... | 02/21/2006 |
| 6985698 | Impedeance matching circuit for a multi-band radio frequency device In an impedance matching circuit for a multi-band radio frequency device, a first radio frequency signal in a first sub-band of a multi-band radio frequency signal is selectively outputted. Further, a second radio frequency signal in a second sub-band of the multi-b... | 01/10/2006 |
| 6980771 | CDMA wireless communication system including finite impulse response filter and phase equalizer for inter-chip interference reduction A digital CDMA wireless communication system. The system includes one or more of said transmitters with a base station baseband processor, a finite impulse response (FIR) filter, a pre-distortion phase equalizer and a digital-to-analog (DAC) converter. Receivers hav... | 12/27/2005 |
| 6961551 | Dual speed squelch circuit and method Squelch circuit and method useful in frequency-scanned radio receivers are provided. Generally, the squelch circuit includes an audio-removal filter coupled to receive an audio signal. The passband of the audio-removal filter is selected sufficiently high relative t... | 11/01/2005 |
| 6937871 | Anti-demodulator circuit, filtering device and demodulator circuit The invention relates to an anti-demodulator circuit which is fundamentally built up in the same way as a demodulator circuit but, instead of a bandpass filter as generally used in a demodulator, comprises a notch filter which receives an input signal comprising a u... | 08/30/2005 |
| 6922454 | Direct conversion radio receiving system using digital signal processing for channel filtering and down conversion to base band A radio receiving system, which receives an input signal in a direct conversion receiving mode through the use of a plurality of cascaded channel filters, each including a complex coefficient filter, to obtain a desired waveform, wherein a center frequency of a prel... | 07/26/2005 |
| 6904179 | Method for minimal-logic non-linear filter implementation A method for implementing a filter on a signal is disclosed wherein interval membership information is computed and stored in such a manner so as to use a minimal amount of memory thereby allowing filter computation by a small number of deterministic sequence of tab... | 06/07/2005 |
| 6898419 | Remotely adjustable bandpass filter Remotely controllable actuators are provided to alter the cavity size of bandpass cavity filters to alter the bandpass characteristics. In one embodiment, a stepper motor is used to provide lateral movement of a tuning plate to alter the size of the cavity. The neck... | 05/24/2005 |
| 6856797 | Programmable radio receiver bandpass filter for cordless/wireless systems A programmable band-pass filter in a radio-frequency receiver. The band-pass filter has a bandwidth substantially covering a channel bandwidth. Once the appropriate channel in use is determined, the frequency band of the band-width filter is set to correspond to it.... | 02/15/2005 |
| 6785522 | Method for changing timbre during conversation in cellular phone The invention relates to a cellular phone terminal system, and in particular to a method for changing timbre of a voice signal during conversation in a cellular phone terminal system having a filter for filtering a PCM input signal. The method comprises the steps of... | 08/31/2004 |
| 6724246 | Demodulation structure and method The present invention relates to a demodulation structure and method for downconverting and demodulating a digitally modulated signal So, with a local oscillator means (1; 5; 8) for providing a local oscillator signal Slo a mixer means (... | 04/20/2004 |
| 6725023 | Radio FM receiver A radio FM receiver is provided with a receiver portion with quadrature channels for converting received radio frequency signals into center frequency quadrature signals, a center frequency filter circuit connected to the former for suppressing undesirable image fre... | 04/20/2004 |
| 6671504 | Radio squelch techniques A radio carrier signal is detected (20) after being converted to digital form and is filtered (22). A noise estimator (24) generates a noise estimate signal by estimating the noise in the detected signal due to atmospheric conditions and the noise due to ... | 12/30/2003 |
| 6405030 | System for interception of digital cellular phone communication A system for interception of digital cellular phone communication which is required by Communication Assistance for Law Enforcement Agency CALEA. The system includes a plurality of wide area networks which control the transmission of voice, data, file and... | 06/11/2002 |
| 6122496 | Device and method for controlling frequency characteristic of a filter When the frequency band of an intermediate frequency (IF) signal input to a filter rises due to temperature variation, the center voltage corresponding to the IF signal also rises. As a result, a difference occurs between the center voltage and a preselec... | 09/19/2000 |
| 6122404 | Visible stokes polarimetric imager A visible Stokes polarimetric imager (80) that separately and contemporaneously measures each of the four separate Stokes polarization parameters of a visible light beam reflected from a scene. The imager (80) includes a compound prism assembly (50) inclu... | 09/19/2000 |
| 5963273 | Circuit for carrying out digital Nyquist filtering of IF intermediate frequency signals The circuit for the digital filtering of IF intermediate frequency video signals comprises an A/D (analog/digital) converter and a Nyquist filter (N); an analog prefilter, suitable for selecting the desired channel, is placed upstream of the A/D converter... | 10/05/1999 |
| 5649321 | Method and apparatus for determining audio band energy of a squelch circuit input signal A squelch circuit (111) that is contained in an communications receiver (100) estimates (403, 405) the energy of an input signal in an audio band and in a first portion of the audio band. The squelch circuit (111) then determines (407) whether the energy ... | 07/15/1997 |
| 5615412 | Digital squelch tail system and method for same A digital squelch tail system (120, 114) selectively attenuates audio output corresponding to a digital signal (156). A bit error rate estimator (210) generates bit error rates (201) for an input digital signal (156). A digital filter (220) coupled to the... | 03/25/1997 |
| 5572552 | Method and system for demodulation of downlink CDMA signals Demodulation of a CDMA downlink signal is performed by filtering correlations of the received signal with a known signature sequence. Unlike the conventional RAKE receiver, the filtering is not necessarily a FIR filter with coefficients equal to the conju... | 11/05/1996 |
| 5535238 | Spread spectrum adaptive power control communications system and method A system and method for adaptive-power control of a spread-spectrum transmitter of a mobile station operating in a cellular-communications network using spread-spectrum modulation. A mobile station transmits a first spread-spectrum signal. A base station ... | 07/09/1996 |
