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| Number | Title | Issue Date |
| 8165549 | Method for notch filtering a digital signal, and corresponding electronic device An electronic device, includes sigma-delta modulation circuit to operate with a clock signal and having output circuitry to deliver a digital data signal. First circuitry delivers a radiofrequency transposition signal. A notch filter includes radiofrequency digital-... | 04/24/2012 |
| 7386280 | Gain insensitive high-pass VGA An integrated circuit radio transceiver and method therefor includes a high-pass variable gain amplifier (HPVGA) operably disposed within one of the transmitter and the receiver front ends operable to provide a linear variable gain and a substantially constant high-... | 06/10/2008 |
| 7376476 | Methods for changing time intervals of the occurrence of audio information from local and remote sites A method of processing audio information for broadcast to an audience can include changing first audio information from occurring in a first time interval to occurring in a second time interval to provide time-changed audio information. The time-changed audio inform... | 05/20/2008 |
| 7280813 | Variable delay radio receiver A radio comprises a receiver and a variable delay circuit. The receiver generates an electrical signal. The variable delay circuit delays the electrical signal by a variable delay time and outputs a delayed electrical signal. The variable delay time is manually adju... | 10/09/2007 |
| 7148748 | Active protection circuit for load mismatched power amplifier A peak detector detects an amplifier output overvoltage condition if the amplifier drives a mismatched load impedance. In response to the detected overvoltage condition, a clamping transistor lowers a reference DC bias voltage supplied by a bias circuit to the ampli... | 12/12/2006 |
| 7123095 | High frequency power amplifier circuit and radio communication system There is provided a high frequency power amplifier circuit capable of enhancing detection accuracy of an output level, necessary for feedback control of the high frequency power amplifier circuit, and capable of executing output power control with higher precision, ... | 10/17/2006 |
| 7062244 | Speed-up mode implementation for direct conversion receiver A speed-up mode control system is operative to generate a speed-up mode signal based on a gain control signal from associated digital circuitry. The speed-up mode signal controls electronics associated with one or more amplifiers to facilitate settling time of an ou... | 06/13/2006 |
| 7050774 | AGC circuit of an FM receiver that reduces interference while maintaining high reception sensitivity A first AGC voltage and a second AGC voltage are taken from the final stage of a radio-frequency circuit and the output side of a bandpass filter, respectively, and the gain of the radio-frequency circuit is controlled on the basis of the two AGC voltages. The pass-... | 05/23/2006 |
| 7043218 | Diversity CDMA reception apparatus having only one CDMA receiving part In a diversity CDMA reception apparatus comprising two reception antennas, one of reception levels in two reception antennas is gradually increased during a predetermined time interval while another of the reception levels is gradually decreased during the predeterm... | 05/09/2006 |
| 7035351 | Automatic gain control loop apparatus A DC offset cancelling circuit with multiple feedback loops suppresses DC offset voltages within an automatic gain control loop apparatus. The apparatus includes a plurality of gain stages connected in series that receive and amplify an input RF signal. Each gain st... | 04/25/2006 |
| 7035610 | AGC circuit of receiver using several local oscillation frequencies An AGC circuit maintains a fixed level for starting AGC operation for an interference wave even if the local oscillation frequency is switched in a receiver that has a plurality of local oscillation frequencies. A frequency correction circuit for correcting the conv... | 04/25/2006 |
| 6993303 | Radio frequency signal attenuation circuitry and gain controlling unit The present invention avoids distortion in a radio frequency device due to a received RF signal which has a voltage strength that is too high. The invention comprises a radio frequency signal attenutation circuitry, a radio frequency signal processing circuitry, int... | 01/31/2006 |
| 6959082 | Method and system for automatic gain control with adaptive table lookup A method and system for automatic gain control is provided. The automatic gain control may be used, for example, with a microphone and voice codec of a speakerphone telephone. In an exemplary embodiment, an amplification gain lookup table stores the gain values. The... | 10/25/2005 |
| 6904274 | System and method for inverting automatic gain control (AGC) and soft limiting A soft limiter for a signal processor includes a variable-gain amplifier, and a threshold detector. The variable-gain amplifier includes a signal input for receiving an input signal, a signal output for providing an output signal representative of the input signal, ... | 06/07/2005 |
| 6904273 | Method and system for automatic gain control in a satellite communications system An apparatus for providing automatic gain control for use in a satellite terminal of a satellite communication system capable of transmitting a plurality of different modes of data. The apparatus includes a demodulator circuit having an analog to digital converter; ... | 06/07/2005 |
| 5884153 | Delayed automatic gain control circuit A delayed automatic gain control circuit using a simple delayed AGC voltage generation section and capable of fixing a start point of AGC in an RF amplification section at a predetermined received signal level without performing a special adjusting operat... | 03/16/1999 |
| 5513387 | Automatic gain control circuit In a receiver for effecting an intermittent reception operation, a reception unit including an antenna, a radio frequency amplifier, a local oscillator and a mixer, a received signal processing circuit for starting signal processing of a received signal f... | 04/30/1996 |
| 5321852 | Circuit and method for converting a radio frequency signal into a baseband signal A device for converting a radio frequency signal directly to a baseband signal includes: a receiving section having a tuner for providing a tuned radio frequency signal and a phase-locked loop for providing a phase-locked signal in response to the tuned r... | 06/14/1994 |
| 4792991 | FM receiver having improved audio quality in response to Rayleigh faded received signals The present invention minimizes noise pops due to Rayleigh fades by controlling receiver gain relative to the average received signal strength so that only a predetermined level of limiting occurs prior to the recovery of the audio information. The amount... | 12/20/1988 |
| 4620147 | Signal detector A signal detector identifies a desired frequency component having the greatest amplitude in an input signal containing other frequency components of smaller amplitude such as spurious noise, etc. This allows measuring for instance the frequency of the des... | 10/28/1986 |
| 4455681 | Dual threshold wide band/narrow band AGC A radio receiver incorporates an AGC system having an upper wide band threshold and a narrow band threshold. Both thresholds are made temperature independent. The narrow band threshold is related to the circuit response to tuning meter voltage and the wid... | 06/19/1984 |
| 4247954 | Active window antenna for motor vehicles To minimize overmodulation in an active window antenna and radio receiver system, an amplification control voltage is produced in the active antenna, i.e., directly behind the antenna pre-amplifier, and is used to control the amplification of the pre-ampl... | 01/27/1981 |
| 4246543 | Delayed AGC circuit A delayed AGC circuit in which an AGC detection output is divided into two portions, one of them is applied through buffer means to an IF amplification stage to thereby control the gain thereof, and the other portion is applied to a tuner through a thresh... | 01/20/1981 |
