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| Number | Title | Issue Date |
| 8160528 | Method and device for detecting presence of a carrier signal in a received signal A device receives a signal and, prior to demodulating the signal determines whether carrier is present in the received signal based on the correlation depth of the received signal. The device determines a plurality of values for the received signal that indicate the... | 04/17/2012 |
| 7706765 | Method and device for enabling and disabling group transmissions A source device (110) receives a carrier signal and continuously monitors the carrier signal for a first predetermined condition and a second predetermined condition. The source device (110) transmits data if the first predetermined condition is satisf... | 04/27/2010 |
| 7697910 | Method for separating a RDS signal component and signal receiver A signal receiver and a method for separating a RDS signal component from a received signal is described. After the received signal has been downconverted to the baseband, the baseband signal is split up into a first baseband signal for a first signal path and a sec... | 04/13/2010 |
| 7383051 | Estimating the location of a mobile unit based on the elimination of improbable locations A method for determining the location of a mobile unit (mobile unit) in a wireless communication system is disclosed. The illustrative embodiment provides a computationally-efficient technique for reducing the number of possible positions that have to be analyzed. I... | 06/03/2008 |
| 7272729 | Data carrier for processing signal stream according to transmission protocols has an active processing circuit and a passive signal processing circuit with power supplies In a data carrier (1) and in an integrated circuit (5), a first signal processing circuit (8) with a signal-independent power supply is provided for processing a signal stream (SF1) in accordance with a first transmission protocol, and a ... | 09/18/2007 |
| 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 |
| 7199664 | Integrated switchless programmable attenuator and low noise amplifier An integrated receiver with channel selection and image rejection substantially implemented on a single CMOS integrated circuit is described. A receiver front end provides programable attenuation and a programable gain low noise amplifier. Frequency conversion circu... | 04/03/2007 |
| 7106188 | Method and system for providing an activation signal based on a received RF signal A method and apparatus are described for providing an activation signal based on a received radio frequency (RTF) signal. The apparatus includes an RF receiver configured to admit a received RF signal in a given frequency band and a converter configured to convert t... | 09/12/2006 |
| 7054389 | Carrier detection circuit and infrared ray remote control receiver A carrier detection circuit of the present invention detects groups of pulses having a carrier frequency by using a detector, and integrates, by an integrator, a time in which the groups are detected, so as to generate a carrier detection level. Therefore, a transis... | 05/30/2006 |
| 7035394 | Tone detector judging a detection of a predetermined tone signal by comparing a characteristic quantity of the tone signal with characteristic quantities of other signals A tone transmission part transmits a tone signal. A tone signal detection part detects data representing an echo signal of the tone signal transmitted by the tone transmission part, and detects data representing a predetermined tone signal targeted to be detected. T... | 04/25/2006 |
| 7010269 | Pre-equalizer structure based on PN511 sequence for terrestrial DTV reception A free-running sample rate converter and a large spanning, non-linear pre-equalizer are employed before a timing recovery loop within a wireless receiver chain, while forward and feedback equalization after the timing recovery loop (at and around the input of a sync... | 03/07/2006 |
| 6944465 | Estimating the location of a mobile unit based on the elimination of improbable locations A method for determining the location of a mobile unit (mobile unit) in a wireless communication system is disclosed. The illustrative embodiment provides a computationally-efficient technique for reducing the number of possible positions that have to be analyzed. I... | 09/13/2005 |
| 6608999 | Communication signal receiver and an operating method therefor A communication signal receiver has a plurality of components. The components are arranged along at least one signal path and comprise a filter (130a-b) for processing a received signal and averaging means (134a-b) for deriving a mean value of the signal.... | 08/19/2003 |
| 6415139 | Detection circuit of tone signal This invention intends to provide a tone signal detection circuit that accurately detects a tone signal regardless of a reception electric field strength. To accomplish this object, the tone signal detection circuit according to the invention is comprised... | 07/02/2002 |
| 6353462 | Television signal and FM broadcast signal demodulator and television signal and FM broadcast signal receiver A demodulator is able to demodulate a television signal and an FM broadcast signal by a common demodulator. Also, a receiver is able to output television video signal and audio signal and an audio signal of the FM broadcast signal by the common demodulato... | 03/05/2002 |
| 6219540 | Communication device providing out-of-range battery saving and method therefor A communication device (100) provides an out-of-range battery saving function (700) for a receiver (104) which receives messages transmitted from at least one transmitter (902) over a radio frequency channel. The communication device (100) includes a sign... | 04/17/2001 |
| 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 |
| 6175600 | System for detecting the presence of a digital signal carrier wave, and a receiver including such a system The invention relates to a system for detecting the presence of a carrier wave in a digital signal that is available at a given frequency. The system delivers at least two baseband samples of the digital signal at each symbol time. The system comprises a ... | 01/16/2001 |
| 6169511 | Radar detector A radar detector is comprised of a voltage controlling oscillator (VCO) instead of DROs, thereby decreasing the cost of radar detector. The radar detector comprises a voltage controlled 1st local oscillator generates a signal of a frequency of 11.2796 GHz... | 01/02/2001 |
| 5999799 | Auto-finder and distance warning method and apparatus for a remote control input device A method and apparatus for preventing the loss of a remote control input device used with a stationary device provides the stationary device with a transmitter and a signal generator that generates signals transmitted by the transmitter. The remote contro... | 12/07/1999 |
| 5966656 | Method and apparatus for displaying signal information in a radio communication device A radio communication device (100) for displaying information about a signal includes a display (120) for presenting the information. A measurer (110) measures signal quality of the signal received by the radio communication device (100), and an entry ele... | 10/12/1999 |
| 5883920 | Spread spectrum receiving apparatus with battery saving function In a receiving apparatus for spread spectrum communications, a carrier detecting circuit for detecting a carrier in a spread spectrum modulated signal is intermittently operated in a standby mode.... | 03/16/1999 |
| 5555451 | High-quality reception indicating circuit for scanning AM recievers The reception quality of an AM broadcast signal is determined within a very short time of tuning to the channel frequency by modifying the intermediate frequency signal to remove the audio information modulated on the carrier but including residual noise ... | 09/10/1996 |
| 5493716 | Method of operating a radio A radio (100), powered by a battery (170), can be used in remote meter reading applications. In order to conserve battery power, the radio (100) is capable of determining that a signal is an image signal rather than a signal on the desired frequency. This... | 02/20/1996 |
| 5465405 | Apparatus and method for detecting signals A circuit to improve the sensitivity of a receiver by more than 3 dB. According to the invention, conventional predetection integrators are replaced by a circuit to compute the correlation of the received signal with a delayed version of the received sign... | 11/07/1995 |
| 5422681 | Satellite broadcast receiving apparatus capable of forming co-distributing system In a satellite broadcast receiving apparatus, when a signal reception is commenced, a receiving condition of an antenna input signal is detected under such a condition that a power supply to a down-converter is interrupted, and the power from a power sour... | 06/06/1995 |
| 5355518 | Receiver with constant battery saving duty cycle A receiver (100) for receiving a carrier signal to produce a recovered signal provides increased battery savings. The receiver (100) includes a detector (10) for detecting the absence of the carrier signal and a detector for detecting the presence of a va... | 10/11/1994 |
| 5283550 | Shopping cart receiver alarm system A shopping cart receiver alarm system includes an RF transmitter for transmitting an RF signal having at least a minimum signal strength within a boundary that is generally defined by the outermost contours of a store parking lot. A receiver assembly resp... | 02/01/1994 |
| 5223815 | Portable anti-theft device A portable anti-theft system and method for sounding an alarm which is a speech synthesizer when a first portable unit and a second portable unit become separated by a predetermined distance is disclosed herein. The system comprises transmitter means in t... | 06/29/1993 |
| 5193216 | Detecting out of range in response to a loss of signal and a history of approaching out of range prior to the loss of signal An out of range detector determines whether a communications device is out of range of its signal if the signal is not detected and a history of received signal strength values consistent with approaching out of range is measured prior to nondetection of ... | 03/09/1993 |
| 5181227 | Receiver having a signal detector and bit synchronizer An apparatus and method for processing a signal is capable of determining the presence of absence of a signal having a predetermined baud rate. By initializing counting registers to either first or second values, and receiving the signal, either the prese... | 01/19/1993 |
| 5140702 | Time based signal detector for operating in a presence search mode and absence search mode during peak times and off peak times A receiver capable of receiving a plurality of signals, wherein more of the signals are received at a peak time than at an off peak time, comprises the method of a first step for determining if the signals are being received by searching in a first search... | 08/18/1992 |
| 5086290 | Mobile perimeter monitoring system A mobile perimeter monitoring system includes a battery powder transmitter adapted to be placed upon the person to be monitored while the system user carries a receiver. The receiver responds to a code transmitted by the transmitter and provides an in-ran... | 02/04/1992 |
| 5079553 | Long range police radar warning receiver A police radar warning receiver is disclosed including a DSP circuit having a correlator and a peak detector to provide after each sweep of a swept local oscillator a dynamic threshold for that sweep as affected by all prior sweeps and against which infor... | 01/07/1992 |
| 5049875 | Method and apparatus for out of range detection in response to nondetection of predetermined baud rates A baud rate detector determines the baud rates of signals received by a selective call receiver. If the signals have no detectable baud rate or the baud rate of the received signals does not match that of a plurality of known selective call network transm... | 09/17/1991 |
| 5032835 | Out of range indication for radio receivers A pager (1) includes switches (12,13,14,15) for setting the priority of a message expected to be received at a predetermined time on a substantially continuous carrier signal. A receiver (3) is then activated for a period of time determined by the priorit... | 07/16/1991 |
| 4972510 | Method and apparatus for squelching dependent on detected bond rate to reduce unwanted audible noise on a mixed voice data channel Unwanted audible noise on a mixed voice data channel is reduced by disabling an audio output device in a radio receiver or transceiver when the receiver determines that the RF signal received contains binary digital bit data. Alternatively, the receiver e... | 11/20/1990 |
| 4920416 | Method and apparatus for detecting a desired television signal A detector indicates the presence of a desired signal when both of at least two conditions occur. The first condition requires the presence of a selected frequency in an input signal and a second condition requires the amplitude of the input signal at the... | 04/24/1990 |
| 4871997 | Proximity sensor apparatus A radio frequency proximity sensing apparatus includes a transmitter having an oscillator circuit for propagating a pulsed RF signal and a receiver having a sensor circuit for the detection of the propagated pulsed RF signal. The receiver includes a logic... | 10/03/1989 |
| 4851820 | Paging device having a switch actuated signal strength detector A paging device includes a radio receiver (10-20) and decoding circuitry (22) for receiving an encoded transmitted signal and operates an indicator (26) to alert a user that a call has been received. A signal strength detector (30) monitors the strength o... | 07/25/1989 |
