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| Number | Title | Issue Date |
| 7826813 | Method and system for determining a time delay between transmission and reception of an RF signal in a noisy RF environment using frequency detection There present description is directed to a method and a system for determining a time delay between a transmission and a reception of an RF signal in a noisy environment. The method comprises: transmitting the RF signal according to a transmit frequency pattern, the... | 11/02/2010 |
| 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 |
| 7305218 | RF switch An RF switch is disclosed. Power of an amplifier installed in an RF switch of a TV receiver is adjusted by using a Schmitt trigger circuit. If an output voltage of an RF automatic gain controller of a tuner is greater than a pre-set upper limit threshold value, the ... | 12/04/2007 |
| 7257178 | Base band circuit of receiver and low cut-off frequency control method A base band circuit of a receiver and a low cut-off frequency control means can quickly converge transition state due to gain fluctuation with setting a low cut-off frequency of a high-pass filter as low as possible. The base band circuit of a receiver has a variabl... | 08/14/2007 |
| 7245894 | Radio receiver and radio signal processing method with controlling gain A radio receiver comprises a first amplifier to amplify a received radio signal; a quadrature demodulator to demodulate the radio signal amplified by said first amplifier and thereby generate a baseband signal; a second amplifier to amplify the baseband signal; a de... | 07/17/2007 |
| 7215937 | Radio wave reception device, radio wave clock, and repeater A received low-frequency standard radio wave, which is an amplitude modulation signal, is converted to an intermediate frequency signal Sa, and is output to a detection circuit and an AGC circuit. The detection circuit and AGC circuit generates an RF control signal ... | 05/08/2007 |
| 7171185 | Direct conversion receiver and DC offset reducing method A determining section (18) and gain variation amount detecting section (9) detect a period having a possibility of a DC-component offset in an internal circuit of a direct conversion receiver increasing beyond an allowable value due to AGC operation, a... | 01/30/2007 |
| 7095990 | Delay profile making method and delay profile making apparatus A signal received under a multipath condition is buffered in storage memories 50a and 50b comprising two banks, and while overlap of write and read is allowed, the received data is supplied to matched filters 60a and 60 | 08/22/2006 |
| 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 |
| 7042285 | RF power amplifier with load insensitive indirect forward power detector A power amplifier circuit includes an adjustable gain power amplifier for amplifying an RF input signal. An isolated node in the adjustable gain power amplifier is isolated from the output load by a gain stage of the adjustable gain power amplifier. The power level ... | 05/09/2006 |
| 7039379 | Method for maintaining automatic gain control settings for a multi-frequency communication device In time divisioned, multi-frequency communication air interfaces it is common for a control channel to be defined on a first frequency while traffic channels are carried on other frequencies. A mobile communication device maintains the automatic gain control (AGC) s... | 05/02/2006 |
| 6799159 | Method and apparatus employing a vocoder for speech processing A vocoder (125) is initialized, prior to processing an initial batch of audio data, from parameters extracted from the first frame of audio data (308, 310, 320, 330, 332). In the instant embodiment, parameters affecting voice encoding, which are based ... | 09/28/2004 |
| 6745016 | Automatic gain control method and device A constant output signal can be achieved by controlling a gain variable amplifier 2 based on a level of an output signal which is derived by variably amplifying a receiving signal S1 (input signal). An AGC output signal S11 is detected by a dete... | 06/01/2004 |
| 6597898 | Automatic gain control method and device A constant output signal can be achieved by controlling a gain variable amplifier 2 based on a level of an output signal which is derived by variably amplifying a receiving signal S1 (input signal). An AGC output signal S11 is detected by a detector circu... | 07/22/2003 |
| 6240283 | Apparatus and method for feedback mitigation in a low speed communications receiver A method and apparatus is shown for controlling the input gain of a receiver wherein the input gain is controlled by sampling an amplified data signal during a time interval when a positive-going feedback transient from an output terminal of the receiver ... | 05/29/2001 |
| 6122331 | Digital automatic gain control An automatic gain control, AGC, circuit comprising with a preferred transition region. A gain correction unit is responsive to an attenuate command and amplify command coming from a feedback system monitoring the AGC's output. The feedback system can indi... | 09/19/2000 |
| 6070063 | Transmitting apparatus and method of adjusting gain of signal to be transmitted, and receiving apparatus and method of adjusting gain of received signal A transmitting apparatus which can suppress unnecessary power consumption. An optimal signal line is selected from a plurality of signal lines (53-56) having different gains provided by respective signal amplifying device to perform gain adjustment on a s... | 05/30/2000 |
| 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 |
| 5878334 | High temperature superconducting low power receiver protector/clutter automatic gain control for radar receiver The present invention provides for a low power receiver protector and stepped attenuator for conditioning a received input signal within a microwave receiver front end. The low power receiver protector includes a detector for generating a surge signal in ... | 03/02/1999 |
| 5677962 | Hybrid analog and digital amplifier with a delayed step change in the digital gain An amplifier comprises a variable gain analog amplifier for amplifying an input analog signal to generate an intermediate analog signal, the gain of the analog amplifier being switchable between two or more discrete gain values. An analog to digital conve... | 10/14/1997 |
| 5361395 | Gain control circuit A gain control circuit in which a switch is provided in series with a capacitor in a time constant circuit so that, under control of a controller, the switch is closed in its own signal reception and opened in an idle time other than the signal reception ... | 11/01/1994 |
| 5036527 | Iterative automatic gain control for an analog front end of a modem An apparatus and method is provided for detecting and amplifying the level of a received signal in the analog front end of a modem so as to maintain the level of the signal below a predetermined signal clipping level. An incoming signal is amplified by a ... | 07/30/1991 |
| 4758793 | Detector log video amplifier A Detector Log Video Amplifier (DLVA) comprising a first RF detector for detecting the power levels of received RF signals having power levels within a first range (e.g., -40 dBm to -20 dBm) and producing corresponding first video frequency signals having... | 07/19/1988 |
| 4633518 | AGC voltage generator with automatic rate switching An AGC voltage generating circuit for an AM radio comprises a product detector adapted to receive an IF signal modulated by an AF signal and synchronously detect the AF signal, a low pass filter adapted to derive from the product detector a filtered volta... | 12/30/1986 |
| 4479153 | Squelch and message storage system and method A system and method for squelching noise and storing messages. Many receiving systems produce noise bursts at the end of the reception of a message and prior to the operation of the muting circuit. Such noise bursts are especially severe in frequency modu... | 10/23/1984 |
| 4172239 | Signal attenuator A circuit is provided for protecting an amplifier from signal overload upon the application of strong signals at the input to the amplifier. A unidirectionally conducting semiconductor device and a capacitor are serially coupled between the input to the a... | 10/23/1979 |
| 4087793 | Digital electronic control and switching arrangement A variable control, such as for a gain or frequency control, having a delay period and switching function at each end point, with status or level indication, is comprised of two simple switches and appropriate logic circuitry. While a first switch is clos... | 05/02/1978 |
| 4013964 | Automatic gain control means for a single sideband radio receiver An audio derived AGC signal for controlling RF and/or IF amplifiers in the radio receiver wherein a first control signal is developed by a circuit having a relatively slow response time when the audio output signal is below a predetermined value and a sec... | 03/22/1977 |
