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| Number | Title | Issue Date |
| 7924890 | Apparatus and method for increasing reliability of data sensitive to packet loss An apparatus and method are provided which preferably increase reliability of data sensitive to packet loss. According to principles of the invention, a quality of service value may be dynamically assigned to network packets based on the contents of the network pack... | 04/12/2011 |
| 7835407 | 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 call discriminator. The voice exchange is capable of exchanging voic... | 11/16/2010 |
| 7715447 | Method and system for tone detection Tone detection includes receiving a series of frames having a signal containing a tone and locating a first frame in the series of frames in which there is at least a partial, tone. The signal energy of the first frame may then be compared to the signal energy of a ... | 05/11/2010 |
| 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 call discriminator. The voice exchange is capable of exchanging voic... | 12/23/2008 |
| 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, based on the relative energy of one or more beacon signal components ... | 11/18/2008 |
| 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 from receiving the data packet. The network interface receives the d... | 10/21/2008 |
| 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 detection of disconnection from the partner apparatus and of the sta... | 07/01/2008 |
| 7318079 | Method and device for filtering a video signal A method and device operable per the method for high-pass filtering an input signal having a sequence of signal values to provide a high-pass filtered output signal having a sequence of filtered signal values. The method includes selecting a first signal value of th... | 01/08/2008 |
| 7313233 | Tone clamping and replacement A method and apparatus to manage tone clamping are described. ... | 12/25/2007 |
| 7283624 | Idle detection for answer supervision A network device has the capability of monitoring voice over data networks calls. The network device includes a voice activity detector that detects voice activity on a voice channel. If no voice activity is detected, the network device disconnects the call. The net... | 10/16/2007 |
| 7277849 | Efficiency improvements in scalable audio coding An audio encoding method of coding audio signals into a layered data stream having a first layer and a second layer is presented. The second layer serves as an enhancement of the first layer. The method involves forming an original digital audio signal, encoding the... | 10/02/2007 |
| 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 comprises first and second arrays of adaptive notch filters correspondi... | 09/18/2007 |
| 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 size in accordance with the analysis. The clamping comprises receivi... | 09/11/2007 |
| 7263080 | Architecture of an integrated circuit for streaming media over wireless networks An integrated circuit for streaming media over wireless networks is disclosed. The integrated circuit includes a media module that is designed to process media data. When non-media data is in, switching means is provided to avoid the non-media data being processed i... | 08/28/2007 |
| 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 augments the appropriate energy and silence interval. ... | 06/26/2007 |
| 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 packets while also detecting DTMF signals. The receiving gateway's ji... | 06/19/2007 |
| 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 pilots, channel estimates corresponding to individual tones are updated ... | 04/24/2007 |
| 7190771 | Internet telephony devices with circuity to announce incoming calls A system detects an incoming telephone call and routes the ring signal to a loudspeaker so that it can be heard at a distance from the telephony device. Once the incoming call has been acknowledged the incoming signal is routed to the headset. New incoming calls are... | 03/13/2007 |
| 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 call discriminator. The voice exchange is capable of exchanging voic... | 01/09/2007 |
| 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 exchanges by suppressing such signaling, thereby avoiding the above-describ... | 01/02/2007 |
| 7149944 | Semiconductor integrated circuit device equipped with read sequencer and write sequencer A semiconductor integrated circuit device includes a semiconductor memory circuit device, a first sequencer, and a second sequencer. The semiconductor memory circuit device stores data. The first sequencer controls writing of data into the semiconductor memory circu... | 12/12/2006 |
| 7142658 | DTMF control A method of selectively sending a DTMF tone from a terminal to a first or a second destination, wherein the terminal sends a signal comprising at least one DTMF tone to an intermediate module prior to distribution to the intended destination, comprising: receiving t... | 11/28/2006 |
| 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 transmitted samples according to a predetermined delay interval. An operation... | 11/14/2006 |
| 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 High Speed Codec enables the base station to pass voiceband modem and FA... | 10/24/2006 |
| 7110391 | Transporting telephony signaling over a data network A telephony system includes a packet-based data network that is coupled to various network elements. The network elements include interface devices that are coupled to corresponding stimulus devices. The stimulus devices may include stimulus telephones or a telephon... | 09/19/2006 |
| 7103159 | Off-hook notifier A method for handling an off-hook event can include the step of detecting an off-hook event with a modem communicatively linked to a circuit loop in which the off-hook event occurs. The detection can be based upon audible information conveyed within the circuit loop... | 09/05/2006 |
| 7082143 | Voice and data exchange over a packet based network with DTMF A method and system for detecting a dual tone in a composite signal having first and second components including means for separating the composite signal into its first and second components, means for estimating power of the separated first and second components, ... | 07/25/2006 |
| 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 the buffer in the previous audio mode. When the system switches from ... | 06/06/2006 |
| 7039044 | Method and apparatus for early detection of DTMF signals in voice transmissions over an IP network A method and apparatus for early detection of in-band DTMF signals in voice transmissions over an IP network are disclosed. Using a digital signal processor, whenever any indication of signals possibly corresponding to the signals characteristic of DTMF tones are de... | 05/02/2006 |
| 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 tones in a communication signal, processing the communication signal ... | 04/25/2006 |
| 6967946 | Voice and data exchange over a packet based network with precise tone plan 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 call discriminator. The voice exchange is capable of exchanging voic... | 11/22/2005 |
| 6961320 | In-band transmission of TTY/TTD signals for systems employing low bit-rate voice compression A method, system, and software product for transmitting TTY/TDD signals in a system employing low bit-rate voice compression are disclosed. The method includes receiving an input signal and generating a teletypewriter (TTY) indicator signal from the input signal. Wh... | 11/01/2005 |
| 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 mode of the processor. If the mode is nonframing, a handshaking tone or... | 10/04/2005 |
| 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 attributes of one or more network devices along the communication ch... | 09/13/2005 |
| 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. The samples may then be translated into information. For example, the ... | 08/16/2005 |
| 6904060 | System and method for transporting a call in a telecommunication network A system and method to detect a call trigger during a call without requiring a service platform to remain connected to the call. A first communication device transmits a call having call signaling and user communications. A signaling processor receives the call sign... | 06/07/2005 |
| 6904062 | Method and apparatus for efficient and flexible routing between multiple high bit-width endpoints Multi-bit data signals are digitally switched between input and output endpoints for simultaneously interconnecting various sets of inputs and output endpoints. Single input may send data to single endpoint, or single input may send data to multiple output endpoints... | 06/07/2005 |
| 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 coefficients is received. The LPC coefficients are representative of an... | 03/29/2005 |
| 6850493 | 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 from receiving the data packet. The network interface receives the d... | 02/01/2005 |
| 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 message and for introducing it into the transmit signal by stealing b... | 11/09/2004 |
