Matches 1 - 50 out of 436 1 2 3 4 5 6 7 8 9 >


Match Document Document Title
9026434 Frame erasure concealment for a multi rate speech and audio codec  
An audio coding terminal and method is provided. The terminal includes a coding mode setting unit to set an operation mode, from plural operation modes, for input audio coding by a codec...
8885814 Feedback impedance control for driving a signal  
A system for driving a first signal onto a wireline includes a driver and feedback circuitry. The driver drives a deterministic signal onto the wireline with an unknown impedance load. The...
8767930 System and method for amplifying attenuated DTMF signals in a packet based network  
A network interface device may include an I/O unit configured to receive data packets from a packet network. A processing unit may be in communication with the I/O unit and be configured to...
8761916 High-performance tone detection using a digital signal processor (DSP) having multiple arithmetic logic units (ALUs)  
In one embodiment, a DSP having four arithmetic logic units (ALUs) and able to have two read/write operations per clock cycle performs silence detection and tone detection for data frames...
8755514 Dual-tone multi-frequency signal classification  
Various embodiments associated with signal classification are described. A repeating signal can be partially corrupted and therefore a receiver can obtain an incomplete signal. In one example, the...
8577020 Communication terminal apparatus  
A communication terminal apparatus is connected to a single telephone line and is configured to be selectively connected either to a telephone set or to a facsimile machine. A pseudo ring back...
8543388 Efficient speech stream conversion  
Speech frames of a first speech coding scheme are utilized as speech frames of a second speech coding scheme, where the speech coding schemes use similar core compression schemes for the speech...
8483384 Enhanced tone detector including adaptive multi-bandpass filter for tone detection and enhancement  
An enhanced tone detector including an adaptive multi-bandpass filter, a tone detector and a filter control unit. The adaptive multi-bandpass filter has a signal input receiving an input signal, a...
8410900 Method for processing received event message  
Techniques for processing an incoming message from premises equipment at a monitoring location. In one embodiment, an event message, including digits with varying amplitudes, is generated at a...
8391469 Methods and apparatus to decode dual-tone signals  
Methods and apparatus to decode dual-tone signals are disclosed. An example receiver to decode a dual-tone signal includes a tone detector to detect a start of a first tone, a first counter to...
8379838 Tone detector  
A tone detector is disclosed that is realizable in digital embodiment on a single integrated circuit die and does not require external components, such as a discrete capacitor. An input connects...
8346235 DTMF signalling between mobile and server  
In a method of processing an incoming sequence of one or more DTMF tones at a mobile device, the sequence is decoded to thereby identify any encoded message. Where the decoding does not identify a...
8229103 Communications systems and methods using wireline adapters  
Systems and techniques for communication over telephony wireline. A command interface and control device may include a wireline input configured to connect the device to an operative line of a...
8223928 Method of and a device for quantifying a tone signal received in a telecommunications network  
A tone signal received in a telecommunications network is bandpass filtered based on an identified type of the received tone signal, providing a bandpass filtered tone signal. The tone signal is...
8170198 Tone signal detector, tone signal detection method, and computer readable recording medium  
Upon selection of the frequency of a tone signal, a local oscillator generates a frequency signal having a shift frequency corresponding to the frequency of this tone signal. A frequency shifter...
8050397 Multi-tone signal discriminator  
In one embodiment, a method for discriminating between a machine generated multi-tone signal and a simulated voice multi-tone signal is provided. The method may comprise comparing output profiles...
7995744 Telephone interface circuit  
A hook switch turns on a transistor by connecting the positive electrode terminal of a capacitor to a base terminal of a transistor in an off-hook state, causing a speech circuit and telephone...
7953607 Integrated mail, internet, and telephony event tracking system  
A method of tracking and acting on events related to the delivery of a mail piece is provided. An integrated record associated with an addressee of a mail piece is created. The mail piece is given...
7949125 Method and apparatus for transmitting signaling tones over a packet switched network  
As part of a system and method for transmitting a signaling tone over a packet switched data (or other communication) network, an audio encoder may have a speech encoding unit and a tone...
7873158 Polled geofencing and distinguished ring-back  
The apparatus may have: a telecommunication network having a tracking calling terminal and a tracked called terminal; a polled geofencing system associated with at least one predetermined area...
7856096 Erasure of DTMF signal transmitted as speech data  
A DTMF signal processing apparatus of the present invention comprises a data divider unit, a DTMF signal component analyzer unit, a weighting processing unit, a buffer, a DTMF signal erasure...
7844048 Selective tone event detector and method therefor  
In one embodiment, a tone event detector first determines whether the presence of a tone is indicated on the input signal, and then, based on this determination, selectively determines whether a...
7751546 Call transfer system, method and network devices  
In a call transfer of a call there is an original calling network device, an original recipient of the call, and a transferee of the call. Systems, network devices, and methods are provided for...
7751554 Sound information providing system  
A sound information providing system, which can eliminate inappropriate sound information, is provided. The sound information providing system includes a receiving unit that receives a phone...
7634078 Communication terminal device adapted to physical characteristics of telecommunication network and method for adapting communication terminal device to physical characteristics of telecommunication network  
The communication terminal device includes a handset, a central controller, a telephone network adaptor unit for converting analog signals transmitted/received between telecommunication network...
7620160 Announcing presence information during telephone call ringback  
A method and system for outputting a call announcement based on presence information of a callee as a ringback tone is provided. The announcement system is provided with presence information of...
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...
7529363 Tone detector and method therefor  
A tone detector able to detect multicomponent tones for various tone formats is disclosed. An input signal is received and frequency and amplitude components, if any, of each sample of the...
7388954 Method and apparatus for tone indication  
A communication system having an echo canceller is disclosed. One embodiment of the echo canceller includes an adaptive filter used to provide an estimate of reflected echo which is removed from...
7277537 Tone, modulated tone, and saturated tone detection in a voice activity detection device  
In a voice activity detection (VAD) device a method for defining tone signals comprises defining a threshold for zero amplitude change, calculating a zero crossing rate of a signal, extracting a...
7272233 Acoustic shock prevention  
Acoustic shock is reduced by attenuating an input signal based on tones detected through frequency domain analysis. The spectrum of the input signal is obtained. A relative energy signal includes...
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...
7245637 Methods and apparatus for suppressing signaling tones in telephony signal  
In some embodiments, a method includes detecting a tone in each data frame of a sequence of telephony signal data frames. A first data frame of the sequence of telephony signal data frames may be...
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...
7227943 Tone detector  
The present invention provides a tone detector that is capable of performing accurate tone signal detection in a short period of time. Specifically, the tone detector according to the present...
7187656 Method and system for processing tones to reduce false detection of fax and modem communications  
A tone processing method and communications system which reduce the probability of falsely detecting modem and facsimile communications that occur on a communications link. The link connects a...
7184542 DTMF tone detection  
The present invention relates to the field of tone detection and, more particularly, to the detection of dual tone multi-frequency (DTMF) tones in software based telecommunications systems. As...
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...
7139380 System and method for performing signaling-plan-specific call progress analysis  
Call progress analysis is performed in a telephone system employing different in-band signaling plans are used. From address information for a call destination in a call initiation message, it is...
7133521 Method and apparatus for DTMF detection and voice mixing in the CELP parameter domain  
A method and apparatus for DTMF detection and voice mixing in the code-excited linear prediction (CELP) parameter space, without fully decoding and reconstructing the speech signal. The apparatus...
7095845 Dual hysteresis signal detection circuit  
A dual hysteresis signal detection circuit is proposed for detecting a duration of a signal with two hysteresis comparators. There is a first band pass filter for inputting the signal and...
7088817 Method and apparatus for performing high-density DTMF, MF-R1, MF-R2 detection  
Detectors determine the presence of valid sinusoids for DTMF, MF-R1 and MF-R2 protocols for encoding dialed digits. The detectors split electrical signals into subbands. Energies within the...
7085370 Ringback detection circuit  
A ringback detector determines whether ringback by comparing measurements of a characteristic of the received signal, such as the energy of the received signal, to a threshold. The threshold is...
7085371 Push-button signal receiving device and a gain control method  
A push-button signal receiving device and a gain control method whereby error in validity determination of a received signal that accompanies the insertion of an AGC circuit can be prevented. An...
7068781 Alarm of a telecommunications terminal connected to a LAN  
Before any supply of remote power to a telecommunications terminal connected to a local area network, the Ethernet equipment must recognize the power class of the terminal by measuring a specific...
7068734 Passive redundant digital data receiver with schmitt-trigger  
A passive coupling structure constructed using printed circuit board traces is used to separate the low and high frequency components of an incoming digital signal. The low and high frequency...
7054435 Apparatus and method for determining a minimal time bound for performing tone detection  
Performing tone detection for an amount of time that is calculated from the tones that the detector is designed to detect.
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...
7043012 Method and apparatus for ring again feature for a telephone system  
A method and apparatus for an automatic ring again feature on a telephone set for a user that answers a telephone call not intended for that user is disclosed. If a user has answered an incoming...
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...

Matches 1 - 50 out of 436 1 2 3 4 5 6 7 8 9 >