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8615280 Error correction for DTMF corruption on uplink  
Aspects relate to provision of enterprise call capabilities to mobile devices. For example, a mobile device can indicate, over a data channel, that a PBX is to make a call on its behalf to a called...
8594138 Methods for in-band signaling through enhanced variable-rate codecs  
Improvements are disclosed for in-band signaling, i.e., transmission of data in a voice channel of a digital wireless network during a voice call session. A family of narrow-band signaling methods,...
8588326 System and method for mapping symbols for MIMO transmission  
Methods and devices are provided for MIMO OFDM transmitter and receivers having odd and/even numbers of transmit antennas. Various methods for pre-coding information bits before space time coding...
8423102 Error correction for DTMF corruption on uplink  
Aspects relate to provision of enterprise call capabilities to mobile devices. For example, a mobile device can indicate, over a data channel, that a PBX is to make a call on its behalf to a called...
8290444 Radio wave receiving apparatus for receiving two different radio wave intensities  
A radio wave receiver that receives two different sets of radio waves and displays intensity of the received radio waves. First and second radio wave processing portions receive respective radio...
8233951 Error correction for DTMF corruption on uplink  
Aspects relate to provision of enterprise call capabilities to mobile devices. For example, a mobile device can indicate, over a data channel, that a PBX is to make a call on its behalf to a called...
8180406 Systems and methods of synchronizing ring tone cycles and delivery of DTMF tones  
Mobile devices use a PBX and application servers associated with the PBX to access voice services. Some mobile devices can support simultaneous data and voice channels, with the PBX and application...
7983310 Methods for in-band signaling through enhanced variable-rate codecs  
Improvements are disclosed for in-band signaling, i.e., transmission of data in a voice channel of a digital wireless network during a voice call session. A family of narrow-band signaling methods...
7983355 System and method for RF signal combining and adaptive bit loading for data rate maximization in multi-antenna communication systems  
A system and method for generating weight values based on maximum data rate for weighting elements included within signal weighting and combining arrangements used in various multi-antenna...
7889813 Method, apparatus and receiver for demapping dual carrier modulated COFDM signals  
A method for demapping dual carrier modulated COFDM signals comprises normalizing an estimated channel state information signal to obtain a normalized channel state information signal, determining...
7720455 Sidetone generation for a wireless system that uses time domain isolation  
A technique includes providing a sidetone path to generate sidetone content in response to audio data and disabling at least part of the sidetone path during an active mode of a radio. The...
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...
7643852 Method to calibrate RF paths of an FHOP adaptive base station  
A method for calibration of RF paths of a frequency hopping adaptive base transceiver station is provided. The method of calibration calibrates a wireless cellular telecommunication system with a...
7493080 Methods and systems for cooperative transmission in multi-hop ad-hoc networks  
Methods and systems that enable a cooperative form of transmission performed by a set of asynchronous transceivers operating as a distributed joint communication system. In an embodiment of the...
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,...
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...
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...
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...
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...
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...
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...
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,...
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...
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...
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....
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
RE28739 Tone control circuit having a frequency controllable filter  
A tone control circuit is in a receiver adapted to respond to a sequence of control tones alternately selected from a first group of tones in a first band of frequencies and a second group of tones...
3885228 FAIL-SAFE ELECTRONIC ENCODER FOR SELECTIVELY OPERATING RAILWAY SIGNAL INDICATOR  
A fair-safe electronic encoder for selectively producing code tones having different frequencies for transmission to a frequency-responsive signal indicator. The encoder is composed of a...
3833861 SIGNAL SUBSTITUTION SYSTEM  
A first selector is to be set up to cause the control tone produced by a variable frequency oscillator to have a first selected frequency. A second selector is set up to cause the control tone to...
3818368 PLURAL OSCILLATOR SYSTEM FOR GENERATING SIMULTANEOUS PAIRS OF SEQUENTIAL TONES  
A first oscillator is rendered operative by a pulse to produce a first tone of limited duration. A second oscillator has frequency determining elements which are sequentially coupled in circuit by...
3739278 RECEIVER DEMUTING ARRANGEMENT EMPLOYING SEQUENTIAL BINARY CODE  
In a highly reliable system for remotely and selectively demuting one or more of multiple receivers, an arrangement employing a sequential binary code wherein a transmitted carrier is selectively...
Matches 1 - 50 out of 72 1 2 >