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| Number | Title | Issue Date |
| 7342374 | Automatic gate operator A barrier movement operator is having a position sensor in a telescoping barrier control arm is described. A controller, remote from the arm, senses the barrier position to identify limits of barrier travel and to control rate of travel of the barrier between limits... | 03/11/2008 |
| 7327249 | Barrier operator system having multiple frequency receivers A barrier operator system is disclosed that is capable of receiving different wireless signals. The system includes a primary controller that is connected to a first receiver which receives a first wireless signal. And the system includes a second receiver circuit t... | 02/05/2008 |
| 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 |
| 7242976 | Device and method for selecting codes According to the present invention, a code selection device wherein, an unused spreading code, or one of a plurality of unused spreading codes, is selected for allocation to a new communication channel, comprises: a dummy spreading signal generator for despreading d... | 07/10/2007 |
| 7170961 | Method and apparatus for frequency-domain tracking of residual frequency and channel estimation offsets Various methods and apparatus for frequency-domain estimation of carrier frequency offsets are provided in which the carrier frequency offset estimate is robust against non-white (frequency-dependent) noise. A carrier-specific weighting factor is associated with eac... | 01/30/2007 |
| 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 |
| 7054672 | Incoming-call signaling melody data transmitting apparatus, method therefor, and system therefor An incoming-call signaling melody data transmitting apparatus of the present invention includes a remixing-method specification data reception section for receiving remixing-method specification data specifying a remixing method for a piece of specified music from t... | 05/30/2006 |
| 7027847 | Communications system and method, wireless communications system, wireless microphone and wireless receiver Herein disclosed a communications system according to the present invention comprises, a wireless microphone transmission apparatus for transmitting a radio microphone signal on a predetermined wireless microphone frequency channel carrying a voice signal and a tone... | 04/11/2006 |
| 7010328 | Wireless communications system, wireless microphone transmission apparatus, and wireless receiving apparatus Herein disclosed a communications system according to the present invention comprising: a wireless microphone transmission apparatus for transmitting a radio microphone signal on a predetermined wireless microphone frequency channel carrying a voice signal and a ton... | 03/07/2006 |
| 6987949 | Wireless microphone system, voice receiving apparatus, and wireless microphone Herein disclosed is a wireless microphone system comprising a plurality of wireless microphones each having a microphone storage area having a unique global identification element stored therein, each of the wireless microphones operative to collect a voice, convert... | 01/17/2006 |
| 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 |
| 6915146 | Method and apparatus for receiving a plurality of different codes at a plurality of different frequencies A receiver capable of receiving a plurality of different codes at a plurality of different frequencies is set forth herein. The receiver offers digital frequency control by using a controller driven signal diode to add or remove capacitance to or from a band pass fi... | 07/05/2005 |
| 5881101 | Burst serial tone waveform signaling method and device for squelch/wake-up control of an HF transceiver A device and method for controlling HF single side band radio squelch operation in which a serial tone burst indicates the start and end of a transmission and identifies an on-going transmission. Additionally, receivers in a power saving sleep mode can be... | 03/09/1999 |
| 5745578 | Apparatus and method for secure communication based on channel characteristics A method and an apparatus for establishing a key sequence for secure communication through a communication channel between a first transceiver and a second transceiver. Each transceiver transmits to the other transceiver a plurality of tones having predet... | 04/28/1998 |
| 5089815 | Vehicle communication system using existing roadway loops A method and system for transferring information between a moving vehicle and a stationary information location having a vehicle detector system with a loop antenna by using the loop antenna as either the receiving antenna for signals transmitted from a m... | 02/18/1992 |
| 4818989 | Selective calling decoder There is disclosed an aircraft selective calling decoder for decoding individual signal tones used in selectively signaling communication of a particular aircraft. The decoder is associated with a channel of receiving equipment in an aircraft and is respo... | 04/04/1989 |
| 4554542 | Guard tone capture method A decoder for receiving and decoding a coded signal includes a particular frequency fo with a first and second amplitude. The first amplitude of the frequency fo is associated with the end of a first coded message while the second am... | 11/19/1985 |
| 4392248 | Attention signal receiver for emergency broadcast systems An attention signal receiver in which emergency broadcast transmissions are detected from various locations. A scanning circuit sequentially activates means to produce a plurality of oscillating frequencies which mix or beat with the incoming r.f. signals... | 07/05/1983 |
| 4385398 | Selective call communication receiver A decoder circuit responds to a given code to provide an enabling signal for rendering an audio circuit operative. A push-button switch actuatable to monitor the channel is associated with timer and electronic switch. One connection places the receiver in eith... | 05/24/1983 |
| 4355210 | Sub-miniature tone encoder with automatic number identification A digitally synthesized tone encoder and automatic number identification generator for a radio-telephone is presented herein. The system includes a tone burst generator for producing two audio tones simultaneously in response to either a keypad input or s... | 10/19/1982 |
| 4310722 | Mobile radiotelephone station two-way ranging system Some cellular mobile radiotelephone systems use tones for certain call connection supervisory functions on radio links. The presence of the correct tone in a received radio channel call signal is determined by using the received signal for producing (32) ... | 01/12/1982 |
| 4302817 | Digital Pseudo continuous tone detector Method and apparatus for sampling input signals of different frequencies and providing a detect signal when the input frequency has a predetermined value suitable for use as a tone decoder for continuous tone controlled squelch systems. The method utilize... | 11/24/1981 |
| 4275271 | Sub-miniature radio telephone decoder Presented herein is a sub-miniature radio telephone decoder which through a unique arrangement of integrated circuits adapted to create frequency detectors and counters provide the means whereby a radio telephone receiver is held in a muted state until a ... | 06/23/1981 |
| 4199761 | Multichannel radio communication system for automated power line distribution networks An automated electric power distribution network includes a radio communication system for transmitting multipurpose, multitone signals in one or more signaling channels over the auxiliary channel or channels of one or more commercial broadcast stations. ... | 04/22/1980 |
| 4166273 | Intrusion detector system An intrusion detector system for detecting the presence of moving targets in one or more surveillance zones and activated either by the presence of the moving target or directly by some positive action for transmitting an alarm signal causing the provisio... | 08/28/1979 |
| 4142184 | Digital multitone generator for telephone dialing A digital signal generator that produces multi-frequency tones in the voice band range for use in telephone station sets utilizing multitone dialing. Amplitude information describing each of eight voice band frequencies is digitally encoded into a sequenc... | 02/27/1979 |
| 4119800 | Radio-telephone interconnection system Circuitry for interconnecting a radio transceiver to a telephone line is disclosed. The circuitry provides controlled access to the telephone system lines from remote radio transceivers by way of a base transmitter-receiver unit which is connected through... | 10/10/1978 |
| 4103235 | Two-tone attention signal broadcasting system To broadcast a two-tone attention signal to receivers, a two-tone generator includes an interrupt switch, which, when a button is depressed, interrupts the audio signal from a broadcasting station and instead applies two combined frequencies which have be... | 07/25/1978 |
| 4103105 | Switching signal generator In a press-to-talk system of radio telephone communication, the operator's particular voice signal actuates a switching signal generator to generate a transmit-receive circuit changing signal which connects the circuit of the radio telephone equipment for... | 07/25/1978 |
| 4058805 | Digital multitone generator for telephone dialing A digital signal generator that produces multifrequency tones in the voice band range for use in telephone station sets utilizing multitone dialing. Amplitude information describing each of eight voice band frequencies is digitally encoded into a sequence... | 11/15/1977 |
| 4053717 | Cordless telephone A cordless telephone including a Touch-tone signal generator module including ten buttons for initiating the generation of telephone switching signals representing ten numeric characters and two additional buttons; one of which is used for switching the c... | 10/11/1977 |
| 4029901 | Control center for a communications system with interchannel patching capabilities A radio communication system of base stations, and a telephone system, are linked and controlled by a control center. A housing having a plurality of control modules electrically and mechanically engaged therein, each control module having a front panel w... | 06/14/1977 |
| 4024475 | Decoder for frequency-modulated tones of two different lengths A frequency recognition circuit includes a first phase locked loop to detect the carrier tone frequency, which locks to the detected frequency and provides the frequency-modulation frequency to a second PLL for modulation frequency recognition. When the p... | 05/17/1977 |
| 4019142 | Selectively callable receiver operated in accordance with tone characteristics The receiver includes a decoder responsive to certain characteristics of a coded signal, such as the frequency of tones, for producing a decoded signal indicative of second characteristics of the coded signal, such as the durations of the tones. A duratio... | 04/19/1977 |
| 3987398 | Remote disconnect-reconnect tap for cable television systems A remotely controlled disconnect-reconnect tap for a cable television system having a head end feeding a cable distribution system. The tap comprises means for receiving and detecting a plurality of pairs of tones modulated on a carrier and sent over the ... | 10/19/1976 |
| 3962553 | Portable telephone system having a battery saver feature A battery saving system for a portable duplex communications system such as a portable telephone system includes a voice operated transmitter within each portable unit which automatically transmits radio signals upon application of audio signals thereto a... | 06/08/1976 |
| 3946313 | Combined encoder-decoder apparatus having a single active filter A combined encoder-decoder for use in two-way radio systems. The apparatus is operable in an encoder mode to provide tone oscillations during operation of the radio apparatus in the transmit mode and also in a decoder mode to provide a control signal in r... | 03/23/1976 |
