Did You Know...
...that the Slinky toy was the result of a failed attempt by engineer Richard James to produce an antivibration device for ship instruments? His goal was to develop a spring that would instantaneously counterbalance the wave motion that rocks a ship at sea. Instead, he developed the Slinky.
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| Number | Title | Issue Date |
| 8121260 | Method and apparatus for retraining of echo cancellation A method of determining if an echo canceller comprised in a communication channel that is used to transmit at least one tonal signal and characterized by a model echo path of the channel, is acceptably adapted to cancel echoes in the channel, the method comprising: ... | 02/21/2012 |
| 8090078 | Systems and methods for half-duplex speakerphones and other two-way communication devices An apparatus to enable half-duplexing capabilities in a two-way communication device is disclosed. The apparatus estimates the signal power and background noise of a first input signal and a second input signal during approximately the same period. The apparatus fur... | 01/03/2012 |
| 8090077 | Testing acoustic echo cancellation and interference in VoIP telephones Described is automatically testing the quality of an audio coupling between juxtaposed first and second digital telephones, e.g., VoIP telephones, such as to quantitatively determine the quality of audio echo cancellers in those digital telephones. An analyzer recei... | 01/03/2012 |
| 7856087 | Circuit method and system for transmitting information Disclosed is an echo suppresser or cancellation circuit including a speech signal extrapolation unit. The speech extrapolation unit may provide extrapolated signal segment approximations to an echo segment replacement unit. The echo segment replacement unit may repl... | 12/21/2010 |
| 7787597 | Automated tools for testing echo cancellers using natural speech excitations There are provided methods and systems for automated testing of echo cancellers using natural speech excitations and evaluating an echo canceller by transmitting a first signal to the echo canceller, wherein the first signal includes a first speech signal and a firs... | 08/31/2010 |
| 7480367 | Fault characterization using information indicative of echo A fault associated with a communication medium is analyzed by correlating a first set of information indicative of echo associated with the communication medium with a second set of information indicative of echo. The fault is characterized based on the correlation ... | 01/20/2009 |
| 7359489 | Method and apparatus for inclusive echo canceller testing A testing and performance analysis methodology applies a series of test vector pairs to the input ports of an echo canceller under test. The test vector signal pair may represent a particular speech activity state transition, e.g., a Brady Model transition. A scorin... | 04/15/2008 |
| 7330500 | Adjustable electronic duplexer A duplexer for a communication device having a transmission unit, a reception unit and a shared antenna is disclosed. The duplexer comprises a first signal path between the transmission unit and the reception unit, the first signal path comprises a filter unit filte... | 02/12/2008 |
| 7324456 | Apparatus and method for testing an xDSL transceiver unit-central office A tester and related method test an xDSL transceiver unit-central office so as to measure performance of a transceiver unit by automatically converting many output ports by connecting a multiplexer to the xDSL transceiver unit. A transceiver unit-central office test... | 01/29/2008 |
| 7305045 | Low voltage swing pad driver and receiver Low voltage swing pad driver and receiver. A transmitter portion and a receiver portion are implemented within various devices that communicate using low voltage swing pads communicatively coupled via a trace. The transmitter portion of one device generates a curren... | 12/04/2007 |
| 7292626 | Method and system for efficient quantization in DAC and ADC for discrete multitone systems An ADSL modem includes a modulator unit with an output analog expander and/or a demodulator unit with an input analog compressor. The modulator unit further includes (a) a first DSP engine outputting a plurality of k-bit words to a non-linear discrete compressor, wh... | 11/06/2007 |
| 7282946 | Delay-insensitive data transfer circuit using current-mode multiple-valued logic The present invention relates to a delay-insensitive DI data transfer circuit based on a current-mode multiple-valued logic for transferring data regardless of a delay time of transmission according to a length of wire. The delay-insensitive data transfer cir... | 10/16/2007 |
| 7272174 | Upstream data transmission A process transmits digital data to an A/D converter via an analog channel. The process includes generating a sequence of output signals by precoding a sequence of input signal points to precompensate for ISI in the analog channel. In the precoding is matched to the... | 09/18/2007 |
| 7269211 | Residual echo reduction for a full duplex transceiver A hybrid circuit within a full-duplex transceiver transmits an outgoing signal outward on a communication channel at the same time it receives an incoming signal arriving via the communication channel, and the outgoing and incoming signals sum to form a combined sig... | 09/11/2007 |
| 7260142 | Dynamic hybrid switching in a wireline modem A method for dynamically switching hybrids during modem initialization to maximize channel capacity and performance includes the steps of evaluating each hybrid in the modem according to a cost function dependent on the quiet receive noise floor and the transmit sig... | 08/21/2007 |
| 7257667 | Status register to improve initialization of a synchronous memory A synchronous flash memory includes an array of non-volatile memory cells. The memory device has a package configuration that is compatible with an SDRAM. The memory device in one embodiment can comprise control circuitry to perform an initialization operation on th... | 08/14/2007 |
| 7254217 | Fault characterization using information indicative of echo A fault associated with a communication medium is analyzed by correlating a first set of information indicative of echo associated with the communication medium with a second set of information indicative of echo. The fault is characterized based on the correlation ... | 08/07/2007 |
| 7251213 | Method for remote measurement of echo path delay A method of measuring echo path delay in a circuit having echo cancellers after enabling an echo signal to pass through the echo cancellers. The known time for a given echo canceller to disable is subtracted from the overall test signal duration. This quantity can b... | 07/31/2007 |
| 7245675 | Upstream data transmission A process transmits digital data to an A/D converter via an analog channel. The process includes generating a sequence of output signals by preceding a sequence of input signal points to precompensate for ISI in the analog channel. In the preceding is matched to the... | 07/17/2007 |
| 7236573 | Method and apparatus for testing telephone sound quality A method and apparatus for testing telephone sets to determine their sound quality comprising a system for repeatedly applying a sequence of pulse tones to a test telephone where the respective tone frequencies are different and within the normal human voice range. | 06/26/2007 |
| 7236586 | Synchronization of echo cancellers in a voice processing system Methods and apparatus for processing a received voice signal from a variable-delay network by a communications system that has at least one echo canceller. An echo canceller determines delay characteristics that are associated with the received voice signal and corr... | 06/26/2007 |
| 7215764 | Current sensing echo cancellation device A passive echo cancellation circuit for reducing echoes on a subscriber line includes an output driver adapted to drive a downstream signal on the subscriber line. First sensing circuitry is coupled to the output driver and adapted to sense a current on the subscrib... | 05/08/2007 |
| 7215762 | Method of selecting impedance setting for loop start trunk line A method of selecting an optimum impedance for a loop start trunk line, comprising successively applying respective ones of a plurality of impedance settings to the loop start trunk line, for each impedance setting measuring the impulse response of the trans-hybrid ... | 05/08/2007 |
| 7194024 | Method for adaptive hybrid selection during ADSL modem training The methodology accomplishes adaptive hybrid selection during ADSL modem training. The adaptive hybrid selection method maximizes performance for ADSL modems in the presence of various impairments on the line by optimally selecting the appropriate hybrid based on li... | 03/20/2007 |
| 7194037 | Active replica transformer hybrid A communication circuit includes a near end replication transmitter and a hybrid having an input in communication with an output of the near end transmitter. A high pass filter is responsive to the near end replication transmitter. A subtractor subtracts an output o... | 03/20/2007 |
| 7164659 | Adaptive gain control based on echo canceller performance information A system and method for provide a stable gain from an adaptive gain control device in a signal path. An echo canceller is also located in the signal path, and is used to provide performance information regarding losses in the signal. This performance information is ... | 01/16/2007 |
| 7142811 | Wireless communication over a transducer device One aspect of the present invention is generally directed towards a system and method of tuning a transducer for transmitting and receiving a wireless signal. In an illustrative embodiment, a single transducer is coupled to a first or second circuit for either trans... | 11/28/2006 |
| 7136471 | Method and apparatus for detecting a secondary destination of a telephone call based on changes in the telephone signal path A method and apparatus for detecting whether a remote party has added a secondary telephone destination to a telephone call, for example through the activation of three-way calling service, conference calling or two lining bridging, by identifying an echo characteri... | 11/14/2006 |
| 7120130 | Seamless redundant echo canceller replacement in a multi-channel echo canceller An echo cancelling system comprises a system controller for directing inbound and outbound PCM signals to one of two echo canceller modules. The system controller receives status information from the echo cancellers and maintains state information pertaining to the ... | 10/10/2006 |
| 7095720 | Trunk level echo canceller test system Integrated echo cancellers in a telecommunications system are tested using a test apparatus connected to the main communications trunk where a large number of individual signals are multiplexed together. The signals are de-multiplexed in the test apparatus and speci... | 08/22/2006 |
| 7092364 | System and method for monitoring DSL service provisioning A system for automatically monitoring provisioning in a DSL network is disclosed. The system is operable to query network elements in the DSL network for information related to the provisioning of DSL services. Thereafter, the system analyzes the information to iden... | 08/15/2006 |
| 7076031 | System and method for telephone signal collection and analysis An apparatus, system, and method for telephone signal collection, processing, and analysis is provided. The apparatus includes a portable field unit for capturing telephone signal data including (a) a connection interface for connecting to the telephone line and rec... | 07/11/2006 |
| 7068611 | Method and apparatus for performing diagnostic tests using an assisting transceiver A method and system for performing diagnostic tests on a communications system. Diagnostic test signals are generated by a transceiver included within the communications system. Diagnostic data signals generated within the communications system in response to the di... | 06/27/2006 |
| 7042934 | Crosstalk mitigation in a modem pool environment In a modem pool system capable of mitigating alien crosstalk, a system including a first modem pool including at least two modems, at least one protected line connected to one of the modems, at least one sensor line connected to another of the modems, at least one a... | 05/09/2006 |
| 7031454 | Method and apparatus for interfacing telephone apparatus to a digital, analog or hybrid telephone switching system An adaptive interface method and apparatus for interfacing a telephony appliance such as an analog telephone, modem, fax modem, facsimile machine teleconferencing device, headset, VoIP telephone or non-compatible digital telephone to a digital, analog or hybrid tele... | 04/18/2006 |
| 7027562 | System and method to reduce echoes in voice communications A system and method to reduce echoes in voice communications are described. Input data containing return loss values of a communication trunk within a communications network is received, the return loss values being measured at each frequency of a plurality of frequ... | 04/11/2006 |
| 7020274 | Universal apparatus and method for interfacing signals with telephony networks A communication apparatus is used to interface signals with any one of a plurality of telephony networks having different impedances. The apparatus includes memory, a processor, a digital-to-analog (D/A) converter, and an interface port. Different sets of impedance ... | 03/28/2006 |
| 7006787 | Mobile to mobile digital wireless connection having enhanced voice quality This invention is directed toward improving the subjective voice quality of a mobile to mobile phone call having tandem vocoder processing by modifying the spectrum of the voice signal before it is processed by the second vocoder to compensate for digital distortion... | 02/28/2006 |
| 7003098 | Method and system for measurement of the delay through a network link bounded by an echo canceller A method and system for measuring the signal transmission time through a network link bounded by at least one echo canceller. The method generally includes the steps of determining a signal transmission time (tA) along a network path including the network link bound... | 02/21/2006 |
| 6999560 | Method and apparatus for testing echo canceller performance A test system measures performance of telephone network echo cancellers using a primary criterion of estimated user annoyance due to audible returned echo. The invention generates live telephone calls, uses real speech samples as stimulus signals and provides tail-c... | 02/14/2006 |
