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| Number | Title | Issue Date |
| 7941198 | Internal audio multiplexing system for multi-channel radios A method of providing audio transmissions from an electronic device having internal audio multiplexing is disclosed. The method comprises combining a plurality of received audio input signals for output as a first mode of operation for the electronic device, where t... | 05/10/2011 |
| 7706851 | Compander, and associated methodology, for a radio communication station operable pursuant to a coded squelch scheme Apparatus, and an associated method, for companding communication data. Companding is provided for a two-way radio communication station operable pursuant to a coded squelch scheme, such as an MURS or FRS radio. A baseband processor invokes compression operations up... | 04/27/2010 |
| 7653423 | 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... | 01/26/2010 |
| 7406096 | Tandem-free intersystem voice communication Techniques are presented herein to provide tandem-free operation between two wireless terminals through two otherwise incompatible wireless networks. Specifically, embodiments provide tandem-free operation between a wireless terminal communicating through a continuo... | 07/29/2008 |
| 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 |
| 7330150 | Combined global positioning system receiver and radio A portable GPS/radio unit communicates over a wireless radio network with at least one other unit which is transmitting radio signals over the network indicative of that unit's location. The GPS/radio unit comprises a GPS receiver for receiving satellite signals fro... | 02/12/2008 |
| 7310378 | Estimating a transmission channel with pilot symbols distributed in lattice structure A method for estimating a transmission channel from a multicarrier signal transmitted through said transmission channel, comprising real pilot symbols and so-called pure imaginary pilot symbols, consists in selecting one or several values zk of the receiv... | 12/18/2007 |
| 7228139 | Location processing system A device for determining the location of a communication device includes a network interface, a signal enhancement module, a tone decoder, and a translator. The network interface is capable of receiving a location message comprising a plurality of signal tones. The ... | 06/05/2007 |
| 7194278 | Method and system for managing device functions based on location A method and system for altering the functionality of a device based on location. When the device is in a designated location, the device may receive a control signal specific to the location. The control signal may cause the device to change its control logic (such... | 03/20/2007 |
| 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 |
| 7142900 | Combined global positioning system receiver and radio A portable GPS/radio unit (10) communicates over a wireless radio network (12) with at least one other such unit. The unit (10) may transmit radio signals over the network (12) indicative of the unit's location. The unit (10) inclu... | 11/28/2006 |
| 7133444 | Combined equalization for DMT-based modem receiver A DMT modem (40) is disclosed, in which a combined time domain equalizer and per-tone equalizer is applied to a received DMT signal. The combined equalizer includes a first FFT function (44) that is applied to a set of samples in a time-domain signal a... | 11/07/2006 |
| 7103330 | Method of transmitting information between an information transmitter and an information receiver The invention describes a method of transmitting information between an information transmitter and an information receiver, the potential difference of which moves in cycles between a minimum value and a maximum value and is situated at the minimum value for regula... | 09/05/2006 |
| 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 |
| 7088985 | Low-noise filter for a wireless receiver A low-noise filter for a wireless receiver is disclosed. The low-noise filter comprises an amplifier and a filter comprising a frequency dependent negative resistance implemented using a general impedance converter to realize a bi-quad filter. The low-noise filter i... | 08/08/2006 |
| 7043286 | Extrinsic signal to shunt an acoustic driver in a cellular telephone, pager or the like A method for selectively shunting an acoustic driver within an electronic device detects the presence of a squelch signal from a local emitter and automatically shunts the acoustic driver in response to the detection, free of any communication back to the emitter. T... | 05/09/2006 |
| 7020448 | Method for detecting a tone signal through digital signal processing A method for detecting a tone signal having a predetermined tone frequency includes receiving an analog communication signal, using a sampling frequency to convert the analog communication signal into a digital communication signal, selecting a plurality of signal s... | 03/28/2006 |
| 6941114 | USB-based wireless transmitting/receiving system A USB-based wireless transmitting/receiving system includes a transmitting portion connected to at least one USB-based peripheral device for receiving a signal from the peripheral device and a receiving portion connected to a computer host and coupled to the transmi... | 09/06/2005 |
| 6940966 | Method and apparatus for detection of a telephone CPE alerting signal A method and apparatus for detecting a signaling tone within a communications channel, such as a telephone line, is presented. The energy level of the communications channel signal is measured at the frequency of the signaling tone and at one or more frequencies tha... | 09/06/2005 |
| 6393308 | Pager with auto powerup for message receipt A pager unit that can receive a message when it is turned off. A power supply of the pager unit is turned on by a control unit prior to the time scheduled to receive a message, and then turned of f after the message has been received. Accordingly, the pag... | 05/21/2002 |
| 6313736 | Method and apparatus in a selective call communication system for identifying a category of information associated with a message A method and apparatus in a selective call communication system is used for transmitting a message of a message type selected from non-maildrop and maildrop (504), wherein the message of maildrop type includes one of a plurality of categories of informati... | 11/06/2001 |
| 6070055 | Radio Selective calling receiver with display and limited function menu A radio selective calling receiver with display, having a plurality of functions which can be set by a user, including a menu window display unit for displaying the plurality of functions which can be set. A function use/disuse setting determination unit ... | 05/30/2000 |
| 6058316 | Dual mode mobile telephone apparatus with user selected analog and digital call modes A dual mode mobile telephone apparatus includes a transmitting/receiving portion (2, 3) for different kinds of modes, an operation portion (4) for assigning an available call mode, a call mode detection portion (13) for detecting the call mode, a call mod... | 05/02/2000 |
| 5991611 | Volume control device for receiver of block coded speech signals A receiver of block coded speech signals receives signals transmitted by means of discontinuous transmission and estimates the acceptable or unacceptable nature of the blocks received. A volume control device commands reduction of the volume in the case o... | 11/23/1999 |
| 5896560 | Transmit control system using in-band tone signalling A transmit control system using in-band tones for activating and deactivating one or more remote sites. The transmit control system detecting energy in two or more spectral regions to determine if the signal received is a harmonic signal or a signalling t... | 04/20/1999 |
| 5878337 | Transaction security apparatus and method A transaction security apparatus which comprises a transaction device, wherein the transaction device one of generates and transmits a first signal in response to a transaction, and a communication device associated with an individual account. The communi... | 03/02/1999 |
| 5708970 | Wireless sound monitoring apparatus with subaudible squelch control In a wireless sound monitoring system, ambient sounds are monitored by a microphone and transmitted over a phase or frequency modulated transmitter to a receiver. A sound actuated switch responsive to ambient sounds louder than a predetermined level turns... | 01/13/1998 |
| 5583885 | Method and apparatus for encoding and decoding automatic radio indentification data A radio communications system includes plural radios with each radio having a microprocessor, a modem, and corresponding automatic number identification (ANI) information as well as a predetermined pattern of tones or digital codes corresponding to a part... | 12/10/1996 |
| 5574771 | Integrated communication system A telephone or two-way digital paging communication system providing an alternative partial communication format in which an acknowledgement signal is transmitted from a telephone device in response to a received voice or data signal. The communication sy... | 11/12/1996 |
| 5575002 | Method for muting a radio When a portable radio (110) receives a transmission from a mobile radio (105), the portable radio (110) mutes a speaker volume of the portable radio (110) for a duration of the transmission from the mobile radio (105). In an arrangement of the mobile radi... | 11/12/1996 |
| 5563908 | Modulator and demodulator apparatus The invention provides a modulator and demodulator apparatus (modem) which modulates and demodulates a signal in a main channel, for main data, and a secondary channel, for secondary data obtained by frequency division, and which includes a carrier detect... | 10/08/1996 |
| 5521582 | Alarm system A signalling device to be worn on the person includes an emergency button (2) which triggers an internal transmitter to transmit an encoded identification signal followed by audio signals derived from sounds picked up by a microphone (3). The transmitted ... | 05/28/1996 |
| 5493582 | Method and apparatus for encoding and decoding automatic radio identification data A radio communications system includes plural radios with each radio having a microprocessor, a modem, and corresponding automatic number identification (ANI) information as well as a predetermined pattern of tones or digital codes corresponding to a part... | 02/20/1996 |
| 5473615 | Digital supervisory audio tone detector A detector for determining the validity of a received code, such as a Digital Supervisory Audio Tone (DSAT) code. A received DSAT code is serially shifted into a shift register (10) which outputs the received DSAT code in parallel format to a set of 24 ex... | 12/05/1995 |
| 5450611 | Fast channel access protocol for a two-way communication system Requesting (transmitting) subscriber units may immediately begin transmitting an information signal over an assigned communication channel. Receiving subscriber units immediately unmute their speakers and monitor the assigned communication channel and att... | 09/12/1995 |
| 5425030 | On-site system frequency sharing with trunking system A method of allowing use of small, low-power communication systems (20) within the coverage area (11) of larger trunked communication systems. A low-power communication system re-uses the same communication resources used by the larger trunked system when... | 06/13/1995 |
| 5327580 | Full duplex RF repeater/base station providing microprocessor-controlled simultaneous CTCSS tone encode/decode A microcomputer within a duplex RF transceiver operates in an interrupt-driven manner to simultaneously encode and decode CTCSS signalling (with one microcomputer interrupt service routine being devoted to CTCSS encode, and another microcomputer interrupt... | 07/05/1994 |
| 5319635 | Electronic duplex communication system A communication unit (10) transmits a first signal (12) that has a plurality of holes (44) therein during the occurrence of which another communication unit may interrupt. A repeater (14) receives the first signal and transmits a second signal (16) compri... | 06/07/1994 |
| 5295178 | Digital signal processor for radio base station A digital FM base station radio having a dedicated digital signal processing (DSP) board operates on audio signals from RF links and land lines. The DSP board detects, filters and generates tones and communicates information regarding these tones to a con... | 03/15/1994 |
| 5287549 | Commuication device and method using transceiver squelch control An audio squelch control for transceiver stations in which all transceivers are initially in a Call mode with the squelch control turned on. While in the Call mode, the squelch control is turned off, enabling the speaker, by receiving the station's coded ... | 02/15/1994 |
