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| Number | Title | Issue Date |
| 5517684 | Radio communication system having current control circuit In a radio communication system, a predetermined bias voltage is applied to the base of a transistor in a high-frequency amplifier circuit immediately before the transistor makes its normal operation. When a high-frequency input signal is received under a... | 05/14/1996 |
| 5493712 | Fast AGC for TDMA radio systems Disclosed is a circuit for automatic gain control (AGC) of random access channels (RACH) and traffic channels in a radio system. The amplitude of the input signal is detected at an intermediate frequency (IF) stage, digitized, and coupled to a digital sig... | 02/20/1996 |
| 5483691 | Zero intermediate frequency receiver having an automatic gain control circuit A receiver automatic gain control (AGC) circuit includes a first adjustable gain control amplifier (158) which is responsive to a gain control signal (156). The AGC circuit further includes a second adjustable gain control amplifier (114) and a control ci... | 01/09/1996 |
| 5465406 | Automatic gain control overshoot limiter for AM receiver A digital radio receiver avoids overshoot or undershoot of an AGC control loop by isolating a carrier signal using an adaptive narrow bandpass filter. The carrier strength signal is used to control either a full AGC loop or an AGC overshoot limiter to avo... | 11/07/1995 |
| 5465407 | Gain controller for a digital mobile radio receiver A digital mobile radio receiver comprising a limiter amplifier, an orthogonal detector, a low pass filter, an A/D converter and a digital signal processing unit, additionally having a head amplifier able to vary a gain between said low pass filter and sai... | 11/07/1995 |
| 5452473 | Reverse link, transmit power correction and limitation in a radiotelephone system The process and apparatus of the present invention limits the output power of a radiotelephone, operating in a cellular system in the preferred embodiment. This ensures the transmitted sidebands and synthesizer phase noise remains within a certain specifi... | 09/19/1995 |
| 5448620 | Volume control for a dual mode communications device FIGS. 2 and 3 illustrate communications devices (30) that are operable in both a radio dispatch mode and a telephone interconnect mode. To mitigate the problem of a relatively high level audio signal from being unexpected broadcast from an ear-piece of th... | 09/05/1995 |
| 5349698 | Radio communication system for a selected one of a plurality of terminal units of different kinds In a radio communication apparatus which is capable of using a selected terminal unit selected from a plurality of terminal units, a logic part detects the kind of the selected terminal unit to produce a type signal representative of the selected kind. Re... | 09/20/1994 |
| 5301358 | Automatic antenna tuning method and apparatus A wristwatch paging receiver is provided with an antenna matching network that automatically retunes the network at the beginning of a listening interval. During the retuning operation, a control signal is applied to a variable tuning element in the match... | 04/05/1994 |
| 5301364 | Method and apparatus for digital automatic gain control in a receiver There is provided a mechanism for Automatic Gain Control in a receiver. It comprises: determining, within a certain dynamic range, the difference in power between the desired signal and a signal received, and providing open loop gain control for the signa... | 04/05/1994 |
| 5263021 | System for integrated distribution of switched voice and television on coaxial cable A system for voice distribution amongst a plurality of telephone subscriber locations operating on a broadband cable network wherein RF transmitting and RF receiving channels for carrying voice and signalling information are established at the subscriber ... | 11/16/1993 |
| 5220419 | Automatic RF leveling in passenger aircraft video distribution system A passenger aircraft video distribution system distributes modulated RF signals provided from a central signal source to be used at each passenger seat. The RF signals are distributed by means of various RF components, including amplifiers (90, 14a, 164, ... | 06/15/1993 |
| 5204976 | Receivers for mobile telephone systems A receiver for a mobile telephone system, the receiver having a gain control coupled to receive an input burst signal and being switchable in response to the value of a gain control signal between a plurality of gain values. A detector for detecting the a... | 04/20/1993 |
| 5204977 | Apparatus and method of automatic gain control in a receiver A radio receiver (107) including at least two amplifier (245, 247, 207) stages each having adjustable gain. The receiver (107) generates a first and a second control signal (267, 229). In absence of receiving an input signal, the receiver (107) adjusts th... | 04/20/1993 |
| 5201068 | Radio telecommunications apparatus A radio telecommunication apparatus comprises a volume key for controlling volume, detecting means for generating a first detection signal in response to continuous push of the volume key, and generating a second detection signal in response to intermitte... | 04/06/1993 |
| 5187809 | Dual mode automatic gain control A gain control system for controlling signal levels of the signal received by a receiver. The gain control system is operable to control the signal levels of the signal when the signal is comprised of either a conventional, constant envelope signal, such ... | 02/16/1993 |
| 4962545 | Volume level retention in a pager A selective call reciver, particularly a pager, is provided comprising an audio transducer for emitting audio signals, particularly voice. A volume setter is provided and a device, such as involatile memory, for protecting the volume setter when the recei... | 10/09/1990 |
| 4876741 | Method of receiving a compressed composite signal A compressed single side band communication system and method in which the audio signal is compressed prior to pre-emphasis and thereafter summed with a pilot tone for further compression prior to transmission. Initially, only the pilot tome is transmitte... | 10/24/1989 |
| 4829593 | Automatic gain control apparatus An automatic gain control apparatus of the digital control type achieves fine control over the output amplitude of the gain controlled signal without increasing the number of bits handled by the A/D and D/A converters. The system operates by adding the ou... | 05/09/1989 |
| 4792990 | Audio amplifier with programmed volume control In a programmed audio amplifier system, the volume setting when the system is turned on is conditionally related to the last volume setting, i.e., immediately before the amplifier was turned off. At turn-on the system remains at the last volume setting as... | 12/20/1988 |
| 4742565 | Radio receiver with field intensity detector A radio reciever having a plurality of intermediate frequency amplifiers and a field intensity detector. A control circuit is provided which generates a control signal for reducing the gains of the intermediate frequency amplifiers in response to an outpu... | 05/03/1988 |
| 4718116 | Method and apparatus for receiving a compressed composite signal A compressed single side band communication system and method in which the audio signal is compressed prior to pre-emphasis and thereafter summed with a pilot tone for further compression prior to transmission. Initially, only the pilot tone is transmitte... | 01/05/1988 |
| 4679245 | Radio receiver A linearity control system comprises a current controlling circuit responsive to a meter control signal for controlling the current flow through the meter so as to increase the range of linear response of the meter.... | 07/07/1987 |
| 4625240 | Adaptive automatic gain control A method and apparatus for optimally processing television compressed audio signals by adaptively controlling the gain of the apparatus. The average value of the digitized signal is compared to a reference value to produce a gain control signal. A variabl... | 11/25/1986 |
| 4606075 | Automatic gain control responsive to coherent and incoherent signals Disclosed, herein, is an Automatic Gain Control (AGC) signal processor and a method for generating an AGC signal in a phase-locked receiver. An incoming signal, exhibiting both coherent and incoherent characteristics, is filtered to obtain the desired ban... | 08/12/1986 |
| 4580288 | Receiver input circuit A receiver input circuit comprising a control loop for amplification control, wherein the control signal for the control loop is derived from the intermediate frequency signal and supplied to the part of the circuit preceding the mixer stage. The receiver... | 04/01/1986 |
| 4509206 | Receiver for multicarrier signals protected from unwanted signals The invention relates to a multicarrier signal receiver protected against unwanted signals. Between the high frequency circuit and the intermediate frequency circuit, it has a frequency-selective attenuation and preselection circuit, while a circuit for d... | 04/02/1985 |
| 4495652 | Control arrangement for radio apparatus Radiotelephone loudspeaker and handset volumes for different types or modes of operation are set by a single control and stored. After being set and stored, the volume for each mode can be retrieved and applied to an electronic attenuator to automatically... | 01/22/1985 |
| 4479255 | Apparatus for acquiring and collecting radio signals coming from a plurality of stations An apparatus for acquiring and collecting messages aboard a satellite which are transmitted via respective radio-signals over different frequencies from a plurality of beacons comprises a receiver having an adjustable gain control input. An automatic gain... | 10/23/1984 |
| 4435846 | Automatic gain control of a single gate GaAs FET amplifier RF preamplification with AGC is employed because of the wide range of signal levels to which the RF input section of a radio is subjected. A reduction in noise figure is obtained by using a single gate gallium arsenide field effect transistor (GaAs FET) a... | 03/06/1984 |
| 4147984 | Dual digital processor transceiver A transceiver includes a keyboard having a plurality of manually actuable keys for selecting operating modes and channels for operating thereon. A first digital processor has inputs coupled to the keyboard for receiving logic signals therefrom of a first ... | 04/03/1979 |
