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| Number | Title | Issue Date |
| 5043999 | Circuit arrangement for digitally setting the gain of a digitally adjustable receive amplifier Circuit arrangement for digitally setting the gain factor of a digitally adjustable receive amplifier. For digitally setting the gain factor of a digitally adjustable receive amplifier independently of the reception signal, the circuit arrangement for pos... | 08/27/1991 |
| 5040194 | Method and apparatus for providing for automatic gain control of incoming signals in a modem An improved circuit for providing automatic gain control (AGC) for incoming phase shift keyed (PSK) and quadrature amplitude modulated (QAM) signals. An absolute value circuit (193) and a comparator (195) provide a first error signal (197). An integrater ... | 08/13/1991 |
| 5020147 | FM/AM broadcast signal converter A received modulated information signal is converted to an intermediate frequency (IF) signal from which modulating information may be recovered by supplying the modulated information signal to two mixers supplied with local oscillating signals of equal f... | 05/28/1991 |
| 5001776 | Communication system with adaptive transceivers to control intermodulation distortion A transceiver determines the signal quality of a desired signal and the strength of all received signals. When the signal quality of the desired signal is low, and the signal strength of all received signals is high, the receiver is adapted to operate in ... | 03/19/1991 |
| 4989074 | Digital automatic gain control apparatus A digital automatic gain control apparatus is provided which controls gain such that when an analog video signal is converted into digital signals for processing, the input of the A-D converter is maintained at a fixed level, and after the analog signal h... | 01/29/1991 |
| 4972353 | Radio-frequency transformer providing automatic gain control and overload protection A composite core transformer has a high permeability segment and a low permeability segment such that a saturable portion of the core is used to control RF energy coupled from a receiving antenna to a radio receiver. Transformer input and output windings ... | 11/20/1990 |
| 4955077 | Radio with broad band automatic gain control circuit The disclosure relates to a radio which prevents the level of a signal transmitted from a desired broadcasting station from being suppressed by the operation of a broad band automatic gain control circuit in the presence of an interference signal. The rad... | 09/04/1990 |
| 4955078 | Frequency difference detector (FDD) having automatic gain control and a carrier modulated receiver including the FDD A frequency difference detector (FDD) implemented as a balanced quadricorrelator has an automatic gain control system (68) having inputs capacitively coupled to the quadrature related, baseband frequency paths from the front end mixers (12,14). The a.g.c.... | 09/04/1990 |
| 4933987 | Remote pressure actuated audio control for a vehicle sound amplification system An improvement is provided for a radio system for a vehicle, such as an automobile. A pressure sensitive transducer is mounted externally on the body of the vehicle and in a position of exposure to pressure changes resulting from air resistance as the veh... | 06/12/1990 |
| 4926443 | Correction circuit for a digital quadrature-signal pair A correction circuit for a digital signal pair having an in-phase signal and a quadrature signal includes a value determining stage and an error-detecting stage. The value-determining stage determines a maximum value and a minimum value for the in-phase s... | 05/15/1990 |
| 4912775 | RF converter circuit An RF converter circuit of a simplified structure includes a tuner circuit, an intermediate frequency amplifier circuit and a frequency conversion circuit connected in this order. An automatic gain control circuit is provided for reforming an intermediate... | 03/27/1990 |
| 4746873 | FM demodulators Apparatus for obtaining programmable threshold extension of an FM demodulator comprises a limiter preamplifier 4 and a variable gain buffer amplifier 6. The buffer amplifier 6 is provided with an external control node 16 such that the signal level fed fro... | 05/24/1988 |
| 4619002 | Self-calibrating signal strength detector A self-calibrating signal strength detector is described. The present invention utilizes a relatively narrow dynamic range receiver sensitivity threshold indicator circuit to calibrate the output signal of a relatively wide dynamic range signal strength d... | 10/21/1986 |
| 4580287 | Radio receiver with logarithmic signal strength detector A radio receiver has one or more automatic gain control (AGC) circuits that each generate the gain-determining bias current in a separate main channel section or sections, e.g. RF amplifier, mixer, IF amplifier, of the radio receiver. The receiver is for ... | 04/01/1986 |
| 4554508 | Carrier detection circuit A carrier detection circuit includes a rectification stage, an integrator, a comparator, and a digital counter. By utilizing a digital counter, long time constants are provided without the use of external components. If desired, a mark detect circuit is u... | 11/19/1985 |
| 4546326 | Fast automatic gain control arrangement Fast automatic gain control (AGC) arrangement provided in an RF receiver which receives data from high-rate multiple transmission channels, in which the AGC amplifier (1) is controlled by a control voltage read from a random access memory RAM (2) which re... | 10/08/1985 |
| 4403349 | Intermediate frequency detection circuit An intermediate frequency detection circuit of a superheterodyne type radio receiver is disclosure which includes a logic circuit inputted with a signal indicating the level of an intermediate frequency output and a signal indicating the level of a high f... | 09/06/1983 |
| 4399561 | Variable capacitance circuit A circuit having a variable input impedance which is controlled by application of a direct current input signal. The variable impedance circuit comprises a pair of capacitors coupled in series with a pair of diodes. The diodes are rendered conductive in r... | 08/16/1983 |
| 4385400 | Automatic gain control arrangement useful in an FM radio receiver In an FM receiver including a plurality of cascaded amplifier stages for successively amplifying an IF signal to form a pulse signal which is demodulated to derive an audio signal, an auxiliary amplifier section beside the cascade is provided to amplify a... | 05/24/1983 |
| 4339728 | Radio receiver signal amplifier and AGC circuit An integrated circuit is employed to provide a high gain signal amplifier having an automatic gain control function and an output suitable for driving signal detection circuitry in a radio receiver. The circuit operates at the receiver intermediate freque... | 07/13/1982 |
| 4334185 | Circuit for automatic gain control with constant response time A circuit for automatic gain control of a feedback system in a time that is essentially constant regardless of the signal level includes a device for producing a signal that is representative of the output of the circuit. The signal is compared with a fix... | 06/08/1982 |
| 4314372 | Methods and means for producing and reproducing transmitted or recorded sound or video signals A sound transmission and reproduction system including at the transmitter side means for producing a non-audible control signal indicative of a predetermined character of the transmitted sound, preferably the intensity of the sound as actually transmitted... | 02/02/1982 |
| 4253083 | Traffic signal system for blind people A traffic signal system for blind people which can be combined with an existing traffic signal device the device having a sound signal generator electrically connected to a blue light of the pedestrian traffic signal device for generating a signal represe... | 02/24/1981 |
| 4238771 | Muting circuit A muting circuit for a television or AM signal receiver which uses a synchronous detector. The muting circuit includes an input terminal for receiving an amplitude modulated signal, a synchronous detector for detecting such AM signal, a circuit for supply... | 12/09/1980 |
| 4204172 | Automatic gain control device for a single-sideband receiver A circuit determines whether the signal transmitted by a variable-gain amplifier comprises information or not. If it comprises information, its level is regulated, by comparison with a first reference signal, in order to give a predetermined correct liste... | 05/20/1980 |
| 4186351 | Signal strength indicator circuit for a radio receiver employing AGC A signal strength meter circuit for an FM radio receiver employing automatic gain control. The signal strength meter circuit includes circuitry for establishing a range of voltages on an AGC line of the receiver corresponding to a range of signals receive... | 01/29/1980 |
| 4170023 | Carrier AGC circuit, especially burst ACC and APC A burst signal level detecting circuit for an automatic color control (ACC) circuit of a television receiver includes a band pass amplifier through which an input chrominance signal is supplied to a first and a second phase comparator via a burst gate. A ... | 10/02/1979 |
| 4168472 | Variable gain controller A variable gain controller comprising an amplifier having a feed back terminal which is connected to a variable resistor including a current controller for controlling current flowing through the variable resistor, a filter connected to the variable resis... | 09/18/1979 |
| 4143331 | Summing amplifier for developing a squelch and meter voltage in a radio receiver In a radio receiver IF amplifier, a high gain AGC circuit produces a constant signal output regardless of input signal levels in excess of a threshold value. A summing amplifier responds to the AGC voltage and the IF amplifier current to develop a d - c p... | 03/06/1979 |
| 4121161 | AM receiver An AM receiver comprises an intermediate frequency amplifying stage and a detector stage. The intermediate frequency amplifying stage includes an automatic gain controlled amplifier which functions as a positive feed back amplifier when received signals a... | 10/17/1978 |
| 4063175 | Amplifier for receive mode operation An amplifier circuit to be interposed between an antenna and a utilization unit such as a radio, scanner, citizens band transceiver or the like. The amplifier circuit includes a current divider for dividing incoming signals into first and second parallel ... | 12/13/1977 |
| 4053843 | Blanker inhibit circuit A radio receiver includes a blanker circuit for muting the receiver in response to interfering noise signals. The invention contemplates a transistor switch which, when biased to its nonconducting state, inhibits blanker action. The transistor is biased t... | 10/11/1977 |
| 3982186 | FM receiver with detector for multi-path reception In an FM receiver having a circuit including RF and IF amplifiers for receiving a selected FM broadcast signal, and an FM detector for converting the selected FM broadcast signal to an audio signal which is applied through an audio amplifier to a loudspea... | 09/21/1976 |
| 3976943 | Phase lock loop AM/FM receiver A received radio signal is demodulated by applying it to a coherent demodulator loop for detection of a modulated input signal. The loop has a variable gain control capability. A gain control voltage dependent upon variations of amplitude of the input sig... | 08/24/1976 |
| 3939428 | Receiver with automatic pass band control A receiver having a circuit producing a control signal that has an amplitude proportional to the intensity of an input signal, and a control circuit permitting the passage of high frequency components of a low frequency signal therethrough or preventing t... | 02/17/1976 |
