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7558223 |
OFDM receiving method of OFDM receiver for receiving an OFDM signal via a plurality of space paths
OFDM signals each including a plurality of subcarriers (including data carriers and pilot carriers) orthogonal to each other are received by a plurality of receiver antennas. The received OFDM...
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7522515 |
Method and system for providing window shaping for multiline transmission in a communications system
A method and system for providing window shaping for multiline transmission in a communications system are described. A last portion of a prefix symbol is extracted. A prefix with a prefix window...
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7486665 |
Transport of DTMF tones over VOATM/VOIP networks
A communication device, such as a Voice over Internet Protocol (VoIP) gateway, determines a duration for Dual Tone Multi-Frequency (DTMF) tone portions of telephony signal. If the duration is less...
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7468992 |
Voice and data exchange over a packet based network with DTMF
A signal processing system which discriminates between voice signals and data signals modulated by a voiceband carrier. The signal processing system includes a voice exchange, a data exchange and a...
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7453912 |
Methods and apparatus for selecting between multiple carriers based on signal energy measurements
Carrier frequency selection and handoff initiation methods in wireless communications systems employing multiple carrier frequencies are described. Although the receiver is tuned to a single band,...
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7440410 |
Off-line broadband network interface
A network interface is presented that receives packet data from a shared medium and accomplishes the signal processing required to convert the data packet to host computer formatted data separately...
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7394771 |
Apparatus and method for data communication including establishing communication using tone signal
In optical two-way communication using a single optical fiber, part of the light transmitted from an apparatus is received as stray light by the apparatus itself. This occasionally hampers accurate...
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7313233 |
Tone clamping and replacement
A method and apparatus to manage tone clamping are described.
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7272136 |
Dual tone multi frequency signal detection
A signalling tone detector for use in a communications network for the detection of dual frequency multi-tone (DTMF) pairs of signal tones in a time division multiplex (TDM) signal. The detector...
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7269142 |
Managing tone clamping in a network
A method and apparatus to manage tone clamping are described wherein atone is clamped using a buffer with a first size and the performance of the clamping is analyzed. The buffer is set to a second...
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7236585 |
Apparatus and method for noise immunity during signal detection
A noise calculation mechanism is incorporated into a cadence tone detector which upon a miss in either a energy or silence interval allows for retention of those periods corresponding to noise and...
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7233605 |
Method and apparatus for minimizing delay induced by DTMF processing in packet telephony systems
The invention solves the problem of DTMF delay by shifting the delay and in-band signal processing to the receiving packet gateway. The transmitting gateway continues to process and transmit voice...
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7209433 |
Channel estimation and compensation techniques for use in frequency division multiplexed systems
Methods and apparatus for performing channel estimate updates in frequency division multiplexed, e.g., (OFDM), systems are described. After generation of initial channel estimates from received...
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7161931 |
Voice and data exchange over a packet based network
A signal processing system which discriminates between voice signals and data signals modulated by a voiceband carrier. The signal processing system includes a voice exchange, a data exchange and a...
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7158543 |
V.8bis suppression method and apparatus for modem relay
The invented method involves one or more gateways sniffing the voice channel during the voice mode. If it is determined that V.8bis signals are being initiated, then the gateway breaks these...
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7136434 |
Apparatus and method for detecting energy of tone signal
An apparatus and a method for detecting the energy of a tone signal. A pre-process unit takes absolute values of transmitted samples and outputs the values to a delay unit for delaying the...
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7126934 |
Method for base station compressing and transmitting high speed data
Two related voiceband compression techniques are employed in order to enable an RF telecommunications base station to accommodate data signals of high speed voiceband modems and FAX machines. A...
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7058066 |
Controlling the transition glitch that occurs when a gateway switches from voice over IP to voice band data
In a gateway router the length of the play-out buffer in VBD mode is not set at a previously established value. Instead the length of the play-out buffer in VBD mode is determined by the length of...
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7035293 |
Tone relay
A system and method for detecting and removing tones from an incoming communications channel that may also carry other signals such as, for example, voice is disclosed which includes pre-detecting...
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6952430 |
System and method for interfacing a data link protocol engine and a physical layer
A system and method is provided for interfacing a protocol component with a physical layer component. Initially, a parameter setting message is sent to the physical layer indicating at least the...
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6944169 |
Method and apparatus for managing quality of service in network devices
A network system comprises a network of data sources interconnecting plural clients by way plural network devices. A data server achieves flexibility in its use of network resources by altering the...
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6931076 |
Signal detector
A method, apparatus, and system for detecting a tone. In some embodiments, a signal is communicated by applying a first quantity of samples per period and a second quantity of samples per period....
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6873701 |
System and method for DTMF detection using likelihood ratios
A system and method for determining DTMF coefficients stores a plurality of reference templates, at least some of said reference templates representative of likelihood ratios. A plurality of LPC...
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6816511 |
Transcoding device provided with a derivation
Transcoder apparatus is designed to transcode a receive signal (UR) into a transmit signal (UE). For this purpose, it includes a signaling transmitting member ( 14 ) for producing a signaling...
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6807234 |
Method and apparatus for constellation mapping and bitloading in multi-carrier transceivers, such as DMT-based DSL transceivers
A multi-carrier transceiver, such as a DMT-based ADSL transceiver, has separate processing paths for different information types, such as voice, data, video, etc. Each processing path can include...
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6771767 |
Signal detector with coefficient swapping transform unit
A signal detector includes a transform unit and a post processing test unit. The transform unit is adapted to a transform unit adapted to receive at least first and second frames of input samples,...
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6771641 |
DTMF digit collection and transportation for a packet network
A system and method is provided for collecting and transporting DTMF digits between two network end points in a packet network in order to preserve the integrity of the DTMF digits. The system and...
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6760348 |
System and method for tone detection in a discrete multi-tone system
The present invention is directed to a system and method for determining when a particular tone in a discrete multi-tone communications system is being used to transmit a control signal. Broadly,...
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6735303 |
Periodic signal detector
A periodic signal detector includes sample counting means for counting a number of samples between adjacent zero cross points in an input signal, the sample counting means outputting the number of...
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6701133 |
Apparatus for and method of synchronising oscillators within a data communication system
A method and apparatus is provided for locking a local oscillator to a reference oscillator. The reference oscillator is arranged to transmit a signal containing two reference pilot tones in a...
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6687368 |
Tone signal detecting method and tone signal detector
A method for detecting a tone signal includes determining a correlative value of an input signal obtained for each frame of a predetermined length, determining an estimating expression that...
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6650662 |
Method and system for transmitting a DTMF signal with compressed voice in a packet switching network
The present invention discloses a system and a method for transmitting DTMF signals over high speed digital networks using voice compression algorithms, and particularly to a system for ensuring...
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6580792 |
Signal detector with automatic gain control
A signal detector includes a transform unit, a gain control unit, and an energy level threshold unit. The transform unit is adapted to receive a plurality of input samples and calculate a first...
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6574334 |
Efficient dynamic energy thresholding in multiple-tone multiple frequency detectors
An apparatus for determining energy threshold detection values for detecting at least one tone having a known frequency and duration in an input signal. The input signal is input over a period of...
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6574207 |
Method for subscriber unit compressing and transmitting high speed data
Two related voiceband compression techniques are employed in order to enable an RF telecommunications subscriber unit to accommodate data signals of high speed voiceband modems and FAX machines. A...
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6487243 |
Modems, methods, and computer program products for recovering from errors in a tone reversal sequence between two modems
Modems, methods, and computer program products for recovering from errors during a tone reversal sequence between a modem pair detect a false tone reversal during a tone reversal sequence at a...
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6480555 |
Method and apparatus for extended range frequency correction burst detection
A radio communication device provides extended burst tone detection for a demodulated I and Q input signal. The device includes a first burst detector coupled with the input signal and provides a...
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6400709 |
DTMF detection in internet telephony
A method of transmitting DTMF tones over an Internet telephone call includes the step of monitoring an audio signal in a transmitting IP Gateway in order to determine when tone is suspected, and...
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6396883 |
Method for detection of pilot tones
A method identifies a pulse sequence having known values and a known length in a signal. According to this method, the mathematical sign of the phase difference between samples of the signal is...
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6266342 |
Adaption resource module and operating method therefor
In order to support both signalling processing on a per channel basis and multiple adaptation protocols, an interface (10) is modularised principally by function. Incident channels (60-62, Ch o ...
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6259691 |
System and method for efficiently transporting dual-tone multi-frequency/multiple frequency (DTMF/MF) tones in a telephone connection on a network-based telephone system
A method and system in a network telephony system for transporting audio signals with lower delay when DTMF is not present. The method of transporting audio signals determines whether DTMF signals...
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6249531 |
Universal voice/fax/modem line over compressed media
An apparatus and method for selectively compressing information to be transmitted over a communications network includes an analog line monitor connected to an analog telephone and an analog data...
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6226303 |
DTMF tone detection and suppression with application to computer telephony over packet switched networks
A method of facilitating telephony communications over a packet-switched network includes detecting signaling tones in an audio stream and blocking them from the stream in response to the...
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6157640 |
Providing feature logic control in parallel with voice over a single subscriber access
Whenever a subscriber associated with a plurality of subscriber features receives or originates a call, an application module associated with the serving local exchange links into the established...
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6125127 |
Method of convenient call acceptance for an ISDN communications controller
In system having a plurality of telephones coupled to a communications controller which is connected to an integrated services digital network (ISDN) line of a telecommunications network, the ISDN...
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6081502 |
Method and apparatus for reducing probability of clipping
A method for reducing probability of clipping in an IFFT-based (inverse fast Fourier transform based) multitone communication transmitter, the method including applying an IFFT to an original...
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6046977 |
Method and apparatus for detecting signal misalignment
A signal detector includes a transform unit and a signal alignment unit. The transform unit is adapted to receive a plurality of frames of time domain input samples and generate a plurality of...
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6031825 |
Infrared audio link in mobile phone
A system for providing an IR-link between a mobile phone and its accessories to transmit audio, control, and data signals between them in an apparent full-duplex real time mode using a conventional...
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6009084 |
Concentrating transmultiplexer for cable telephony
A transmultiplexer is connected between digital facilities and analog facilities for translating information between TDM and FDM formats on the digital and analog facilities, respectively....
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5943319 |
Packet format interface for telecommunication instruments
Improved telecommunication apparatus is realized with a structure that is tailored to interact with the telecommunication network strictly in packet format. The apparatus includes circuitry for...
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