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| Number | Title | Issue Date |
| 7653367 | Squelch detector A squelch detector that differentially detects a presence of a communication signal on a communication channel. The squelch detector being coupled to outputs of a differential offset bias amplifier to receive differential offset biased signals and generate a differe... | 01/26/2010 |
| 7489915 | Squelch circuit and communication apparatus used with the same A squelch circuit and a communication apparatus used with the same that are able to generate a squelch signal even if a squelch period is short and an operation of a squelch detecting circuit is insufficient, the circuit having: a squelch detecting circuit detecting... | 02/10/2009 |
| 7395042 | Enhancing signals in a two-way radio system Embodiments of the present invention can be used to enhance signals in a peer-to-peer radio system, such as a two-way radio system. In one embodiment, the invention includes receiving a communications signal on a channel from a remote radio at a radio using a plural... | 07/01/2008 |
| 7359688 | Device and method for displaying a status of a portable terminal by using a character image Disclosed are an apparatus and a method capable of expressing use state of a portable terminal by using a character image. The apparatus includes an emotion value memory for storing emotion variance values allocated to events occurring in the portable terminal in or... | 04/15/2008 |
| 7310497 | Radio communication repeater The invention proposes a repeater designed for indoor transmissions. The useful frequency band is split into two frequency bands and the repeater amplifies the signals from one of the bands and translates them to the other band. The transposition of frequency bands ... | 12/18/2007 |
| 7295631 | Stereo demultiplexer A stereo demultiplexer is proposed which can be calculation power efficiently implemented in a DSP. Modern digital FM receivers exploit the information content in the in quadrature component of the modulated difference signal for a noise reduction. The proposed ster... | 11/13/2007 |
| 7282965 | Signal detection circuit capable of automatically adjusting threshold value The signal detection circuit of the present invention includes: a comparison section for comparing the absolute value of a voltage of an input differential signal with a threshold voltage corresponding to a first detection level adjustment signal to detect presence/... | 10/16/2007 |
| 7231194 | Localization of narrowband signals The invention relates to detecting a narrowband signals from received signals. According to the different aspects of the invention, a sample set is first formed from received signals, whereby elements of the sample set represent their absolute values, and a lower re... | 06/12/2007 |
| 7218903 | Squelch detecting circuit The present invention provides a squelch detecting circuit capable of high-speed transfer while using a reduced number of high-speed operating operational amplifiers to reduce power consumption and the cost of parts. Input differential signals inputted to a differen... | 05/15/2007 |
| 7180933 | Squelch circuitry for high speed high frequency operation A squelch circuit for operating at high speed and at high frequencies includes a squelch input unit, a low swing pre-amplifier and a sampling and decision circuit. The squelch input unit pre-processes the positive and negative signals of an input signal to generate ... | 02/20/2007 |
| 7149498 | Detecting usable frequency channels by exploiting complex polyphase filter operation A circuit arrangement for detecting a usable frequency channel includes first and second devices for performing frequency conversion. The first and second frequency conversion devices have respective local oscillator inputs to which respective local oscillator signa... | 12/12/2006 |
| 7142838 | Wake up device for a communications system The present invention teaches a communications system comprising a first communications device for receiving data and a wake up signal. The first communications device comprises an active mode of operation and a sleep mode of operation for reducing power consumption... | 11/28/2006 |
| 7133468 | Concurrent FM signal receiver A method and apparatus are provided which detects distortion in a received FM signal caused by amplitude modulating and phase transition of two combined FM signals. A method corrects and modifies the distortion by detecting a distorted sample, replacing the distorte... | 11/07/2006 |
| 7120408 | Differential signal squelch detection circuit and method An electrical circuit detects a “squelch,” or “out-of-band,” state of a differential signal pair having a positive (“p”) signal line and a negative (“n”) signal line. In one embodiment of the invention, a first and a second comparator each have posit... | 10/10/2006 |
| 7096051 | Enhancing signals in a two-way radio system Embodiments of the present invention can be used to enhance signals in a peer-to-peer radio system, such as a two-way radio system. In one embodiment, the invention includes receiving a communications signal on a channel from a remote radio at a radio using a plural... | 08/22/2006 |
| 7076176 | Optical signal receiver and optical space transmission system An optical signal receiver comprising an opto-electric converter for converting an optical signal transmitted from a remotely opposed transmitter into an electric signal, a reproduction circuit for reproducing a data signal from an output of the opto-electric conver... | 07/11/2006 |
| 7072622 | Signal processing method for a walkie-talkie device A walkie-talkie device applies a continuous tone-coded squelch system (CTCSS) to control signal transmission. The walkie-talkie device has an analog-to-digital converter, a digital signal processor, and a digital-to-analog converter. The signal processing method inc... | 07/04/2006 |
| 7057969 | Self-timed sneak current cancellation A sensing circuit. The circuit includes an integrator to sense charge release from a passive electronic device and a comparator to interpret the charge release as one of at least two data states. The circuit also includes a compensation module to generate a compensa... | 06/06/2006 |
| 7050818 | Location based service request system A wireless phone based system to accommodate users of wireless phones for providing information as to the location of certain services such as gasoline stations, movie theatres, drug stores, etc., includes the utilization of a GPS receiver and a wireless phone, with... | 05/23/2006 |
| 7043223 | Super-regenerative radio frequency receiver and its data receiving method A high sensitivity of a Super-Regenerative Radio Frequency Receiver and its method is provided in the embodiment of the present invention. By using a common-mode feedback circuit and by replacing the rectifier with a feedback integral-rectifier, the rectifier, the l... | 05/09/2006 |
| 6967529 | Large dynamic range programmable gain attenuator A design of integrated circuit components to prevent accidental turn on when large input signals are accepted. With integrated circuits operated at lower power supply voltages, input signals having large peak values can tend to turn on devices within the integrated ... | 11/22/2005 |
| 6961366 | System and method for redundant path connections in digital communications network A system and method for providing redundancy in an integrated circuit (IC) relay device has been disclosed. The relay device accepts communications on a first and second receive path. The relay device monitors communications on both the receive paths, and selects a ... | 11/01/2005 |
| 6961551 | Dual speed squelch circuit and method Squelch circuit and method useful in frequency-scanned radio receivers are provided. Generally, the squelch circuit includes an audio-removal filter coupled to receive an audio signal. The passband of the audio-removal filter is selected sufficiently high relative t... | 11/01/2005 |
| 6859645 | Squelch detection circuit Disclosed is a transmission envelope detector referred to a squelch detection circuit for effectively detecting an element of transmission data in a high speed serial data transmission system. The squelch detection circuit of the invention includes a differential in... | 02/22/2005 |
| 6775527 | Squelch circuit with adjustable reference level A squelch circuit with an adjustable reference level, having an input level comparator with a first, a second, a third and a fourth current input terminal, a first and a second input terminal, and an output terminal. A first current source is coupled between the fir... | 08/10/2004 |
| 6774700 | Current-mode logic differential signal generation circuit employing squelch An electrical circuit generates both a differential data signal and a “squelch,” or “out-of-band,” state over a differential signal pair by employing common-mode logic (CML) technology. In one embodiment of the invention, a CML buffer having true and complem... | 08/10/2004 |
| 6775526 | Modulated input signal filter A modulated input signal is filtered to reduce noise. The state of the input signal controls the state of a switch. Depending upon its state, the switch connects one of two circuits to a gate. The gate receives the input signal and it passes or blocks the signal dep... | 08/10/2004 |
| 6671504 | Radio squelch techniques A radio carrier signal is detected (20) after being converted to digital form and is filtered (22). A noise estimator (24) generates a noise estimate signal by estimating the noise in the detected signal due to atmospheric conditions and the noise due to ... | 12/30/2003 |
| 6671503 | Wireless microphone system There is provided an improved receiver unit for wireless microphone system. The receiver unit accomplishes desirable mute control in accordance with state transmitting conditions of electric wave from a wireless microphone. The receiver unit includes a re... | 12/30/2003 |
| 6564041 | System and method providing improved FM carrier squelch system An improved squelch system (10) is provided in accordance with the present invention. The system includes a high-deviation subsystem (20) to detect a carrier with modulation, and a low-deviation subsystem (30) to detect the carrier with minimal modulation... | 05/13/2003 |
| 6553215 | Weather radio control This system is for automatically controlling a radio receiver to provide an audible broadcast of the weather alert from weather stations. It may also be incorporated in a multi-band radio for automatically switching between AM/FM broadcast and weather ale... | 04/22/2003 |
| 6456833 | Method for noise reduction in the reception of RF FM signals A method for noise reduction during FM reception and a receiver executing the method. A detected audiosignal is being attenuated. A field strength indicative muting control signal is derived from an IF signal which is used to control an attenuation of the... | 09/24/2002 |
| 6397050 | Multiband squelch method and apparatus A squelch circuit for a radio receiver that detects the presence of speech by utilizing a filter bank for filtering an intermediate frequency or baseband signal from the radio receiver into band-pass signals, detecting the magnitude of the band-pass signa... | 05/28/2002 |
| 6397049 | Two-way radio with improved squelch A two-way radio (1) that has a radio frequency receiver (2) having a modulated radio frequency signal output and a variable bandwidth filter (3) with an input coupled to the modulated radio frequency signal output. The radio (1) also has demodulator circu... | 05/28/2002 |
| 6385440 | Mobile communication receiver with asymmetric muting control A mobile communication receiver generates an audio signal from a radio signal received on a communication channel, detects conditions on the communication channel, mutes the audio signal according to a first rule when the channel conditions are bad, and u... | 05/07/2002 |
| 6374095 | Method and apparatus for providing a squelch function on narrow band radio receivers Squelch circuitry for narrow band audio receivers which uses a sub-audible tone or coded signal to modulate the intermediate frequency in accordance with the presence of a desired broadcast signal and then detects the sub-audible tone frequency or coded s... | 04/16/2002 |
| 6334060 | Multi-channel or split-frequency, low frequency, telemetry circuit and method between transmitters and receivers A multi-channel system is provided for both wide-band and narrow band low frequency transmission/reception of digital telemetry. The multi-channel system uses coherent detection having a high selectivity, and a quadrature detector having a high sensitivit... | 12/25/2001 |
| 6295444 | Non-predictive tone-coded-squelch frequency determination method A non-predictive tone-coded-squelch (TCS) frequency determination method of scanning a plurality of radio frequency channels in a radio receiver and determining the presence of a standard tone-coded squelch frequency on the radio frequency channel (205) t... | 09/25/2001 |
| 6259904 | Fast squelch circuit and method A technique is used by a squelch circuit (200) that generates a fast squelch. The technique involves generating a noise signal (211) from a demodulated signal (105), generating a squelch check request (405) of one of two types, performing a release (410) ... | 07/10/2001 |
| 6212245 | Communication apparatus The high-frequency component removing circuit is immediately started, and is not stopped unless the measurement value of the received electric intensity has maintained a value equal to or higher than the filter level for 1 sec after the high-frequency com... | 04/03/2001 |
