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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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,...
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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...
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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...
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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...
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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...
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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...
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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...
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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,...
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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...
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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...
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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....
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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3731200 |
SUBAUDIBLE REMOTE CONTROL TONE ENCODING SYSTEM
A paging system includes a transmitter for transmitting a carrier frequency signal modulated by subaudible tone signals in response to audible tone signals coupled to the transmitter from a remote...
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3723876 |
EMERGENCY DISTRESS SIGNALING SYSTEM
A system for addition to a conventional dispatched vehicle two-way radio communication system to enable an operator to notify a central dispatcher of an emergency condition arising after the...
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3702440 |
SELECTIVE CALLING SYSTEM PROVIDING AN INCREASED NUMBER OF CALLING CODES OR AUXILIARY INFORMATION TRANSFER
The selective calling system includes a transmitter having first and second signal generators providing sinusoidal and rectangular signals which are combined to form a modulated calling signal....
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