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| Number | Title | Issue Date |
| 7630488 | DTMF tone generation in a media gateway A system and method for generating Dual Tone Multi-Frequency (DTMF) tones in the media gateway of a Universal Mobile Telecommunications System (UMTS) network. The method includes receiving a DTMF signal in a media gateway controller, where the DTMF signal can be a s... | 12/08/2009 |
| 7336750 | Optimal one-shot phase and frequency estimation for timing acquisition A method and system for an optimal one-shot estimate of phase and frequency for timing acquisition employ a maximum a posteriori (MAP) formulation to calculate a cost function that is a function of an estimated frequency and an estimated phase. A plurality of cost f... | 02/26/2008 |
| 7286522 | Synchronizer for use with improved in-band signaling for data communications over digital wireless telecommunications networks An inband signaling modem communicates digital data over a voice channel of a wireless telecommunications network. An input receives digital data. An encoder converts the digital data into audio tones that synthesize frequency characteristics of human speech. The di... | 10/23/2007 |
| 7245234 | Method and apparatus for encoding and decoding digital signals Provided are method and apparatus for encoding and decoding multi-channel signals composed of a plurality of channels using a similarity between frequency bands and a similarity between channels. multi-channel digital signals are encoded/decoded using a similarity b... | 07/17/2007 |
| 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 |
| 7155528 | Simple supplementary service protocol for H.323 systems A simple supplementary service protocol (SSSP) is provided for implementing functionally based supplementary services using the H.323 standard. According to the preferred embodiment, a generic and expandable protocol is provided for passing supplementary services in... | 12/26/2006 |
| 7130793 | System and method for minimizing overrun and underrun errors in packetized voice transmission When it is determined that a sample queue exceeds a first predefined level, samples being received from a IP switched network are modified such that samples are removed within the voiced region of the samples by removing whole pitch periods of samples. If the sample... | 10/31/2006 |
| 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 |
| 7076460 | Interactive remote auction bidding system An interactive remote auction bidding system for conducting an auction utilizes a data input device for communication over a network to the auction site. The system includes a data processor located at the auction site for generating bid information for communicatio... | 07/11/2006 |
| 7069243 | Interactive remote auction bidding system An interactive remote auction bidding system for conducting an auction utilizes a data input device for communication over a network to the auction site. The system includes a data processor located at the auction site for generating bid information for communicatio... | 06/27/2006 |
| 7062033 | DTMF signal transmission method and communication apparatus A communication apparatus connected to a PBX and an ATM network is provided with a DTMF signal detecting portion for detecting whether or not a DTMF signal is contained in a voice signal from the PBX, a DTMF signal monitoring portion, a DTMF cell generating portion ... | 06/13/2006 |
| 7050570 | DTMF signal transmission method and communication apparatus A communication apparatus connected to a PBX and an ATM network is provided with a DTMF signal detecting portion for detecting whether or not a DTMF signal is contained in a voice signal from the PBX, a DTMF signal monitoring portion, a DTMF cell generating portion ... | 05/23/2006 |
| 7035394 | Tone detector judging a detection of a predetermined tone signal by comparing a characteristic quantity of the tone signal with characteristic quantities of other signals A tone transmission part transmits a tone signal. A tone signal detection part detects data representing an echo signal of the tone signal transmitted by the tone transmission part, and detects data representing a predetermined tone signal targeted to be detected. T... | 04/25/2006 |
| 7020272 | High density signal classifier for media gateways A signal classifier decomposes a subject signal into subbands. The signal classifier then analyzes the subbands for a presence of energy and uses detection logic to classify the energy as being representative of a frame of a signal using one of the following protoco... | 03/28/2006 |
| 7010117 | Multi-frequency tone detector A multi-frequency tone detector with analysis window (i.e. filter size) chosen such that spectral nulls are located at adjacent frequencies of interest. The decision logic block of the tone detector uses the roll-off characteristics of the filter in conjunction with... | 03/07/2006 |
| 7003093 | Tone detection for integrated telecommunications processing Disclosed is an integrated tone detection processor for discriminating between tone and voice signals and determining the tones. The tone detection processor performs Automatic Gain Control (AGC) to normalize the power of the tone or voice signal. Further, the energ... | 02/21/2006 |
| 6999526 | Method for simple signal, tone and phase change detection A method for detecting an information signal, tone and/or a phase change of a tone in one or more signals which contain inter alia this information signal or this tone, is characterised in that each signal is divided into segments (blocks), in that only a selection ... | 02/14/2006 |
| 6996218 | FSK decoder for caller ID A device for processing a frequency shift keying (FSK) signal including caller ID information that comprises an analog-to-digital converter (ADC) converting the FSK signal into a digital FSK signal, the FSK signal further comprising a first frequency component, a se... | 02/07/2006 |
| 6940964 | Push-button signal receiving circuit and a method of detecting a push-button signal A push-button signal receiving circuit and a push-button signal detection method are provided which can enhance frequency detection accuracy and yet can reduce erroneous determination as to the valid length of PB signal and thus erroneous operation. Valid signal det... | 09/06/2005 |
| 6937717 | Low power signal detection The present invention provides a low power method and apparatus for detecting a signaling tone. The apparatus comprises a resonator which can be configured to resonate at a specified frequency, a controller for configuring the resonator, and a comparator for compari... | 08/30/2005 |
| 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 |
| 6853725 | Method and apparatus for off-hook management of plural subscriber premises devices connected to same telephone line An off-hook management telecommunication system comprising a DTMF detector, an encoder and a microprocessor located within a channel unit. The system allows the user to depress a selected sequence of keys during a line connection which indicate to the microprocessor... | 02/08/2005 |
| 6850616 | Frequency error detection methods and systems using the same A method of detecting frequency errors exceeding a predetermined limit in a sampled signal includes the step of determining a peak amplitude of the signal at a tone frequency for a first frame of samples of the sampled signals using a filter having a first amplitude... | 02/01/2005 |
| 6801622 | Devices, software and methods for passing DTMF signals under voice compression Devices, software and methods are provided for encoding DTMF signals for telephone connections between digital voice communication systems that use compression, such as wireless connections or network connections. First the twist of the DTMF signals is determined, a... | 10/05/2004 |
| 6801608 | Telephone incoming signal discriminator A telephone incoming signal discriminator includes a first relay, an FSK detector, a DTMF detector, a pin detector, a tone amplifier and oscillation control, an FSK/DTMF decoder IC, a memory, a buzzer, a comparison/setting control IC, an auto answer machine, and a s... | 10/05/2004 |
| 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, determine a first plurality of energy values for the first frame base... | 08/03/2004 |
| 6763106 | Signal detector with duration-based frame width A signal detector for detecting at least a first signal having a first frequency and a first minimum duration is provided. The signal detector includes a matched transform unit and an energy level detection unit. The matched transform unit is adapted to receive at l... | 07/13/2004 |
| 6731745 | Frequency deviation detecting apparatus and frequency deviation detecting method A frequency deviation detecting apparatus for detecting frequency deviation of a dual tone multiple frequency (DTMF) signal includes frequency deviation analyzers for analyzing a received signal for frequency components proximate fixed frequencies in analytical bloc... | 05/04/2004 |
| 6700973 | System for transmitting DTMF signal and communication equipment thereof A communication apparatus 1 or 2 connected to a PBX 4 or 5 and an ATM network 3, is provided with a DTMF signal detecting portion 102 for detecting whether or not a DTMF signal is contained in a voice signal from the PBX 4 or 5, a DTMF signal monitoring p... | 03/02/2004 |
| 6694010 | Recognition of a single frequency tone A fast-converging, computationally simple, method for recognizing a single frequency tone or a sinusoid in a signal without prior knowledge of the tone frequency. The method employs a second order or higher auto-regressive model and includes: (a) sampling... | 02/17/2004 |
| 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 represents an output power of a second order FIR band elimination... | 02/03/2004 |
| 6683948 | Device for automatically identifying DTMF and FSK for caller ID A device for automatically identifying DTMF and FSK system is disclosed. A signal detector is provided for detecting signals on a telephone line. A DTMF and a FSK decoders are provided for decoding DTMF and FSK signals, respectively. A microprocessor is a... | 01/27/2004 |
| 6674855 | High performance multifrequency signal detection A multifrequency detector, such as a DTMF detector, includes a Goertzel module detecting energies of a current frame of an incoming signal at nominal tone frequencies. A number of ratios are computed from the detected energies and supplied as an input to ... | 01/06/2004 |
| 6671252 | Robust signaling tone duration measurement Apparatus and methods for adaptively, reliably, and accurately measuring the duration of an alerting or other signaling tone. A tone detector in accordance with the principles of the present invention accurately measures a duration of a tone burst (i.e., ... | 12/30/2003 |
| 6668057 | Apparatus for receiving tone signal, apparatus for transmitting tone signal, and apparatus for transmitting or receiving tone signal An arithmetic processing section is designed to repeatedly execute product-sum arithmetic processing a number of times equal to the number of samples corresponding to each of the frequencies, in which a value obtained by subtracting a product-sum arithmet... | 12/23/2003 |
| 6665350 | Method and system for improved analog signal detection A method and system for improved detection of analog signals, where the analog signals may be composed of one or more analog frequencies. In the method and system, an analog signal is received. A stream of data samples is created from the analog signal. B... | 12/16/2003 |
| 6608896 | Efficient digital ITU-compliant zero-buffering DTMF detection using the non-uniform discrete Fourier transform Computationally efficient DTMF detection methods and apparatus are presented that meet all of the ITU recommendations using the modified non-uniform DFT. The system of the present invention employs a high band filter block and two low band filter blocks t... | 08/19/2003 |
| 6590972 | DTMF detection based on LPC coefficients A system and method for DTMF tone detection receives an input signal. The input signal includes a DTMF tone. The DTMF tone has a first frequency and a second frequency. An initial first frequency and an initial second frequency of said DTMF tone are selec... | 07/08/2003 |
| 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 plurality of delay values based on the input samples. Each de... | 06/17/2003 |
| 6560331 | System and method for precise DTMF signal detection A method and system for facilitating the detection of DTMF tones is disclosed. The method is based on detecting two tones using a modified nonuniform discrete Fourier transform that includes a phase correction term for each DTMF tone and harmonic. The dis... | 05/06/2003 |
