|
Match
|
Document |
Document Title |
|
|
7602902 |
Method and apparatus for decoding DTMF tones
A method for decoding a DTMF tone which includes collecting the width of serial signals by measuring the time interval between zero-crossing points within a predetermined time; counting within the...
|
|
|
7532606 |
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...
|
|
|
7529362 |
System, methods, and computer-readable medium for tracking, reconciling, and reporting on DTMF data and voice data communicated between call centers and users
Automated, computer-based systems, method, and computer-readable media for tracking, reconciling, and reporting on data representing Dual Tone Multi-Frequency (DTMF) tones and voice signals...
|
|
|
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...
|
|
|
7457597 |
Signal detection using probabilistic techniques
A receiver uses probabilistic techniques to identify the value of a received signal based upon a space of potential signals that may be generated by the transmitter. The receiver uses one or more...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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)...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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,...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
6556674 |
Signal detector with matched filter coefficient
A signal detector for detecting at least a first signal having a first frequency includes a matched transform unit and an energy level threshold unit. The matched transform unit is adapted to...
|
|
|
6484139 |
Voice frequency-band encoder having separate quantizing units for voice and non-voice encoding
A voice encoding device according to the present invention includes an encoder having a first quantizing block suitable for voice encoding and a second quantizing block suitable for non-voice...
|
|
|
6456618 |
Method and apparatus for DTMF signaling on compressed voice networks
A method of transmitting DTMF signals over a compressed computer network ( 24 ) comprises sending a packet containing a compressed DTMF signal followed by a confirmation packet. The confirmation...
|
|
|
6430284 |
System and method for redirecting control of in-band signaling
In a telecommunication system having a network switch capable of independently controlling inbound and outbound call legs, a system for, and method of, redirecting in-band control of signaling...
|
|
|
6381330 |
False tone detect suppression using multiple frame sweeping harmonic analysis
Detection of alerting or other tone signals in a composite signal are reliably detected with an improved false tone detect suppression technique which employs the use of a moving window analysis on...
|
|
|
6269160 |
Communications device including an improved CPE alerting signal (CAS) detection system
A communications device is presented including a DTMF detector for detecting a DTMF signal. When the DTMF signal is a Mode 2 Caller ID CAS, the first DTMF tone has a frequency of about 2130 Hz, and...
|
|
|
6240093 |
Transfer method of push-button signals
A transfer method of a push-button signal includes the steps of detecting a push-button signal created by an end user terminal during a state in which the end user terminal is connected to a remote...
|
|
|
6236724 |
Methods and apparatus for encoding and decoding data transmitted over telephone lines
A method of generation and detection of acoustic signals carrying alpha-numeric data for reducing the effects of noise and thereby improving signal transmission without the need to boost the power...
|
|
|
6229889 |
Robust signaling tone frequency measurement
Apparatus and methods for adaptively, reliably, and accurately measuring the frequency of an alerting or other signaling tone. A tone detector measures the frequency of a tone (continuous or...
|
|
|
6226370 |
Telephone pager and intercom system
A pager system connectable to the existing telephone wiring for activation through the normal residential DTMF telephone instruments, the system including a plurality of pager devices, each...
|
|
|
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...
|
|
|
6157712 |
Speech immunity enhancement in linear prediction based DTMF detector
To determine whether a received signal represents a dual tone multi frequency (DTMF) code, a characteristic of the received signal is repeatedly measured over a period of time, thereby obtaining a...
|
|
|
6128370 |
Multiple tone detection using out-of-band background detector
A multiple tone detector includes n tone detectors, each detecting one of n distinct tones, where n≥2, and a background detector which generates a measure of accumulative background energy E avg ...
|