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"That’s an amazing invention, but who would ever want to use one of them?"
President Rutherford B. Hayes ; Said in 1876, after Alexander Graham Bell demonstrated the telephone to him at the White House
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| Number | Title | Issue Date |
| 8073418 | Receiving systems and methods for audio processing A receiving system for audio processing includes a first demodulation unit and a second demodulation unit. The first demodulation unit is utilized for receiving an audio signal and generating a first demodulated audio signal. The second demodulation unit is utilized... | 12/06/2011 |
| 8064866 | Passive processing device for interfacing and for ESD and radio signal rejection in audio signal paths of an electronic device A passive processing device (D) is adapted to be interfaced in a full integrated way on at least a first audio signal path defined between a first audio signal source and an audio signal processing means of an electronic device, such as a mobile communication device... | 11/22/2011 |
| 7885631 | Method for receiving signal in communication system and system therefor Disclosed is a method for receiving a signal by a receiver in a communication system, the method includes receiving a signal; estimating a first noise value by using a reference signal included in the received signal; estimating a second noise value by using at leas... | 02/08/2011 |
| 7590400 | Radio apparatus In a radio apparatus, the band of a loop filter of a synthesizer in a blank channel searching state is narrower than the band in a communicating state. In addition, a radio wave environment is measured. A characteristic necessary for the radio apparatus is determine... | 09/15/2009 |
| 7415260 | Current-mode direct conversion receiver A current-mode direct conversion RF receiver is presented. In one set of embodiments the RF receiver comprises a simple transconductor input stage to create a current-mode modulated signal from a voltage-mode modulated signal. A downconversion mixer may be coupled t... | 08/19/2008 |
| 7403760 | DC offset correction for direct-conversion receiver A DC offset correction system for a direct-conversion receiver is disclosed that may include a DC feedback correction servo-loop in signal communication with a baseband section, where the DC feedback correction servo-loop is coupled to both the input and output of t... | 07/22/2008 |
| 7366489 | Mobile communication apparatus A transceiver suitable for larger scale of integration employs direct conversion reception for reducing the number of filters. Also, the number of VCOs is reduced by utilizing dividers to supply a receiver and a transmitter with locally oscillated signals at an RF b... | 04/29/2008 |
| 7299026 | Method and apparatus for interference cancellation performing level adjustment processing for standardizing a channel estimation value between operations of channel estimation processing and joint detection operation processing From a delay profile, path selectors 105a˜105n discard the signals other than those corresponding to valid paths, such as noise, output the channel values, which are obtained through the selection of valid paths alone, to JD decoder 1... | 11/20/2007 |
| 7295823 | Combined discrete automatic gain control (AGC) and DC estimation An automatic gain control (AGC) and DC estimation and correction technique for wireless communication devices is provided. An AGC signal, which controls a gain applied to a received signal by a gain stage to generate a scaled signal, is assigned one of a relatively ... | 11/13/2007 |
| 7280812 | Digital baseband receiver with DC discharge and gain control circuits A digital baseband (DBB) receiver for receiving and processing a wireless communication signal. The DBB receiver includes at least one low noise amplifier (LNA), at least one demodulator, a direct current (DC) discharge circuit and an LNA control circuit. The LNA se... | 10/09/2007 |
| 7277688 | DC offset correction for very low intermediate frequency receiver A wireless receiver includes a local oscillator, a mixer, a band pass filter, a DC offset determination module, a DC offset correction module, a subtraction module, and a down converter. The local oscillator produces a local oscillation that a mixer uses to down con... | 10/02/2007 |
| 7266359 | DC interference removal in wireless communications A method for removing direct current (DC) interference from a signal received by a communication receiver is provided that removes both a DC offset signal induced by the communication receiver and transmitter. The method includes removing the estimated DC offset fro... | 09/04/2007 |
| 7260373 | Direct conversion receiver In a direct conversion receiver, to cancel a DC offset generated in the baseband processing block, negative feedback arrangements comprising a gain control amplifier and a low-pass filter are respectively attached to the I and Q signal branches of the baseband block... | 08/21/2007 |
| 7254379 | RF receiver mismatch calibration system and method A calibration system for an RF system that includes an RF receiver capable of operating in a normal mode and in a calibration mode. The calibration system includes a phase delay unit provided on at least one of an I channel output and a Q channel output of the RF re... | 08/07/2007 |
| 7231193 | Direct current offset correction systems and methods A system and method for direct current offset correction are disclosed. One embodiment of the system includes a direct current offset correction circuitry having an adjustable bandwidth and control logic configured to effect a bandwidth change of the direct current ... | 06/12/2007 |
| 7221925 | Broadcast receiver with antenna/frequency diversity Noise and multipath distortions in a broadcast receiver are reduced by an optimal antenna/frequency diversity concept in which the distortions in the audio signal are evaluated to choose a different antenna and/or a different frequency for at least signal parts.... | 05/22/2007 |
| 7212813 | Telecommunication device with software components The present invention provides a telecommunication system that has a processing unit; a memory; and at least a software component implemented on a processing unit and using said memory. Each software component includes a set of attributes, each attribute being a poi... | 05/01/2007 |
| 7184738 | Radio apparatus In a radio apparatus, the band of a loop filter of a synthesizer in a blank channel searching state is narrower than the band in a communicating state. In addition, a radio wave environment is measured. A characteristic necessary for the radio apparatus is determine... | 02/27/2007 |
| 7171180 | AM receiver circuit performing sound quality compensation of AM detection output signal An AM receiver circuit comprises an IF intensity detection section which detects intensity of a carrier wave of an IF signal and outputs an IF signal carrier wave intensity signal in accordance with the detected intensity. The IF intensity detection section extracts... | 01/30/2007 |
| 7164898 | Wireless portable device A current restriction structure for restricting a higher-harmonic-wave current generated in a digital circuit block from entering a radio circuit block and/or a radio-frequency current generated in the radio circuit block from entering the digital circuit block is d... | 01/16/2007 |
| 7164897 | Method and apparatus for conversion of radio frequency (RF) signals using aperiodic mixing signals An inexpensive, high-performance, fully-integrable, multi-standard transceiver with a topology including: an active mixer, followed by a high pass filter, and a passive mixer. The input signal is modulated up, or demodulated down, using a pair of complementary, aper... | 01/16/2007 |
| 7139542 | Method and apparatus for compensating DC level in an adaptive radio receiver A radio frequency receiver 30, 32, includes a first component block 12, 16, 18, 20; a second compensating component block 22, 22a–22b, 34; and control circuitry 26 operable for controlling the state (e.g., load, bia... | 11/21/2006 |
| 7133469 | Quadrature demodulator In case that a difference between a frequency of an input signal, which has been subjected to a quadrature modulation, and a frequency of an oscillator is large, a center of spectrum of a mixer output signal shifts, and strays from a pass band of a roll-off filter. ... | 11/07/2006 |
| 7099383 | Apparatus and associated method for operating upon data signals received at a receiving station of a fixed wireless access communication system Apparatus, and an associated method, for acting upon data signals received at a base station of a fixed wireless access communication system. A plurality of modems are positioned at the base station, and a controller controls to which modem that a data signal, trans... | 08/29/2006 |
| 7062243 | Combined discrete automatic gain control (AGC) and DC estimation An automatic gain control (AGC) and DC estimation and correction technique for wireless communication devices is provided. An AGC signal, which controls a gain applied to a received signal by a gain stage to generate a scaled signal, is assigned one of a relatively ... | 06/13/2006 |
| 7006806 | System and method for SAP FM demodulation Certain embodiments of the present invention provides a system and method for SAP FM demodulation. The system includes a bandpass filter for isolating the SAP signal, a Hilbert filter to produce a copy of the SAP signal phase shifted by 90 degrees, an FM demodulator... | 02/28/2006 |
| 6999733 | Peak factor reduction device In the conventional peak factor reduction technique, since the signal has been changed over broad time width before and behind the peak amplitude, the deterioration in signal quality has been great. Through the use of a compensating signal having impulse property th... | 02/14/2006 |
| 6985711 | Direct current offset cancellation for mobile station modems using direct conversion A system and method for canceling DC offset for Mobile Station Modems having direct conversion architectures. The present invention is a fast acquiring DC offset cancellation block that provides rapid and accurate DC offset estimates and cancellation techniques to s... | 01/10/2006 |
| 6980781 | Dynamic second stage filtering for pilot energy strength measurements A wireless communication system exposes first stage filtered energy estimates to a second stage filter whose length dynamically varies with time. With the second stage filter, it is possible to further suppress noise in low SNR conditions without affecting the overa... | 12/27/2005 |
| 6968171 | Adaptive noise reduction system for a wireless receiver A receiver with reduced near field noise is described. The receiver has a far range receiving section configured to sense a desired signal that includes near field noise. The receiver further includes a near range receiving section configured to sense a near field n... | 11/22/2005 |
| 6895232 | Method and apparatus for receiving radio frequency signals A method and apparatus for receiving radio frequency signals in a communication system is described. The inventive method and apparatus utilizes an inventive receiver circuit that downconverts an input signal so that interference components of the input signal can b... | 05/17/2005 |
| 6871055 | Direct conversion receiver, mobile radio equipment using the same, and RF signal receiving method In a direction conversion receiver, a quadrature demodulator produces differential signals in a baseband on the basis of a local signal of a frequency synthesizer, with the differential signals being inputted through a first low pass filter, a gain control amplifier... | 03/22/2005 |
| 6859238 | Scaling adjustment to enhance stereo separation A demodulator (10) converts television signals to video baseband signals and audio baseband signals including stereo signals representing a right channel signal value and a left channel signal value. A DSP (60) recursively finds a preferred coefficient... | 02/22/2005 |
| 6750850 | Viewer system for a wireless device A system and method for rendering information on a wireless personal information manager device includes reading viewing control parameters in a dataset stored in memory on the device. The dataset further includes a plurality of records to be selectively viewed. The... | 06/15/2004 |
| 6697612 | Receiving section of a telephone A processing unit with balanced outputs transfers a received digital signal to an amplification unit with balanced inputs and outputs. A control unit enables or disables the processing and amplification units in response to a power up/power down signal. T... | 02/24/2004 |
| 6658116 | Stereo radio receiver A stereo radio receiver has a channel separation stage for setting an optimal channel separation of the left audio channel from the right audio channel, even under sufficient receiving field strength following a time of multipath reception for the duratio... | 12/02/2003 |
| 6654593 | Combined discrete automatic gain control (AGC) and DC estimation An automatic gain control (AGC) and DC estimation and correction technique for wireless communication devices is provided. An AGC signal, which controls a gain applied to a received signal by a gain stage to generate a scaled signal, is assigned one of a ... | 11/25/2003 |
| 6473605 | Noise reduction and range control radio system A radio back-end circuit that includes an integrator and a first variable voltage translator having a signal input coupled to the output of the integrator circuit. Also included is a first variable low pass filter, a second variable voltage translator, an... | 10/29/2002 |
| 6442383 | Demodulator and digital wireless communication receiver A demodulator for use with a digital wireless communication system is disclosed, that comprises a DC offset controller for removing a DC offset of a modulated signal that is input to the demodulator, a complex multiplying unit for complex-multiplying an o... | 08/27/2002 |
| 6356749 | Automatic adapt circuit for circumventing demodulator transients in radio receiver An auto-adapt circuit (200) for altering radio receiver parameters due to demodulator transients and preventing the loss of received information. The auto-adapt circuit includes a detector circuit (215) connected to the output of a receiver demodulator (2... | 03/12/2002 |
