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| Number | Title | Issue Date |
| 8064593 | Auto host disconnect on loss of power to a headset amplifier Systems for a loss of power detection for headset amplifiers are disclosed. The system generally includes a headset and headset amplifier. The headset amplifier includes a switch for electrically connecting the headset and a telephone apparatus. The switch is closed... | 11/22/2011 |
| 7508930 | Technique for independent ground fault detection of multiple twisted pair telephone lines connected to a common electrical power source A method and apparatus detects a ground fault on a span-powered telecommunication wireline within a plurality of span-powered wireline segments, to respective ones of which DSL-Cs are coupled, so that a ground fault may be detected when power is delivered by the DSL... | 03/24/2009 |
| 7397913 | Telephone apparatus for stabilizing call in no power operation mode and method for controlling the same A telephone apparatus and method for stabilizing a call in a no power operation (NPO) mode. A sub-controller controls the NPO mode by at least one of a central office line voltage and an external supply voltage, and a main controller performs a booting operation in ... | 07/08/2008 |
| 7283635 | Headset with memory A headset having a built-in memory to store parameter settings relating to headset performance characteristics such as headphone(s) and/or microphone performance characteristics. The performance characteristics can be measured during headset production and stored in... | 10/16/2007 |
| 7260210 | Unbalanced slic with a built-in ring circuit A method and apparatus is provided for implementing an unbalanced subscriber line interface circuit with built-in ring circuit. A signal to be conditioned is received. An unbalanced output buffering function is performed upon the signal to be conditioned using an un... | 08/21/2007 |
| 7260214 | Programmable subscriber line circuit partitioned into high voltage interface and digital control subsections A subscriber line interface circuit has a battery-powered, high voltage analog section, that drives tip and ring lines of a subscriber loop, and a mixed signal (low voltage and digital signal processing) section, that monitors and controls the high voltage analog se... | 08/21/2007 |
| 7190784 | Method and apparatus for adaptive DC level control A method and apparatus is provided for DC level control in a line card. The method includes receiving a digital input signal, determining a first DC component value of the digital input signal at a first preselected time, and determining a second DC component value ... | 03/13/2007 |
| 7177418 | Power efficient ADSL central office downstream class G power switch Systems and methods are provided for switching between power supply rail voltages for a differential driver device of a class G amplifier device. The amplifier device employs power MOSFETs to switch between supplying high supply voltages and low supply voltages to t... | 02/13/2007 |
| 7178045 | Optimizing exit latency from an active power management state A transmitting device and a receiving device are coupled together via an interconnect. An electrical idle ordered set is received at the receiving device power management unit after having been transmitted by the transmitting device and received at the input pins of... | 02/13/2007 |
| 7155254 | Method and apparatus to self-configure an accessory device A method (200) for self-configuring a smart accessory allows for a common platform to be used for a variety of accessory options. The presence of an optional mechanical, electrical, and/or software configuration is detected (206) and compared to access... | 12/26/2006 |
| 7139391 | DAA hook switch A hook switch circuit is shown wherein two high-voltage bipolar transistors, a PNP transistor Q1 and a NPN transistor Q2. that are connected in a regenerative feedback manner to form a bi-stable latch. The regenerative structure permits the use of low ... | 11/21/2006 |
| 7120143 | Voice-over Internet protocol processor The present invention is directed to audio processing including IP telephony audio processing. Voice-over-IP terminals used in phone terminal applications benefit from a low-power implementation suitable for the limited chassis area of these devices. According to an... | 10/10/2006 |
| 7099463 | Method and apparatus for detecting a compatible phantom powered device using common mode signaling A method and an apparatus provide for determining whether a data terminal equipment (DTE) device represents a compatible device lacking an independent power supply and adapted to be powered using phantom power over a wired connection from a communications device suc... | 08/29/2006 |
| 7095846 | Half duplex device and signal processing method thereof A half duplex device and signal processing method thereof. First, a signal detection unit of a signal detector of a half duplex device obtains a short-term power and long-term power. Next, a data update unit of the signal detector sets a short-term power threshold a... | 08/22/2006 |
| 7076055 | Tracking switchmode power converter for telephony interface circuit A comparator-based switchmode power converter monitors the most negative of the tip and ring line voltages, to control the supply voltage to a SLIC. The voltage applied to the SLIC's power terminals is slightly higher than the sensed voltage for different loop signa... | 07/11/2006 |
| 7050577 | Programmable subscriber line circuit partitioned into high voltage interface and digital control subsections A subscriber line interface circuit has a battery-powered, high voltage analog section, that drives tip and ring lines of a subscriber loop, and a mixed signal (low voltage and digital signal processing) section, that monitors and controls the high voltage analog se... | 05/23/2006 |
| 7026799 | Circuit assembly for operating a luminous signal The invention relates to a circuit assembly for operating a luminous signal, particularly an LED signal, comprising at least one light-emitting diode (D) to which a resistance (R) is serially connected and a control (St) is connected in parallel. In order to adjust ... | 04/11/2006 |
| 7013007 | Computer telephony power supply method and apparatus A method for generating power signals within a telephone server coupled to a computer system via an interface bus or in-house power connector, to a maximum number of telephones, and to a telephone trunk, the computer system providing a primary voltage signal and a s... | 03/14/2006 |
| 7006623 | Circuit for reducing voltage peak in interfacing with a telephone line According to an embodiment, a DC driver circuit is coupled to a tip/ring line. The DC driver circuit includes a first capacitor coupled to a first switch where the first switch is coupled to an amplification circuit. An RC circuit is coupled to a second switch where... | 02/28/2006 |
| 6973074 | Transmission of digitized voice, voiceband data, and phone signaling over a priority-based local area network without the use of voice over IP techniques or a separate voice-dedicated network A method and apparatus for transmitting voice, voiceband data and phone signaling is described. Analog voice, voiceband data and phone signaling are converted into their corresponding digitized version. The digital voice, digitized voiceband data, and digitized phon... | 12/06/2005 |
| 6956943 | Method and apparatus for minimizing the telephony ring voltage power supply requirements of an integrated services hub The present invention discloses a method and apparatus for reducing the power required by an integrated services hub supporting a plurality of telephone circuits, comprising offsetting ringing of each of the plurality of telephone circuits such that all the telephon... | 10/18/2005 |
| 6956945 | Method and apparatus for phantom battery feed A method and apparatus is for providing a phantom battery feed to reduce power consumption in a differential amplifier circuit. A voltage signal is driven onto a telecommunications line using a first amplifier and a second amplifier. A phantom battery feed is perfor... | 10/18/2005 |
| 6940970 | Ring boost circuit to extend ringing range of telephone SLICs A ring boost circuit has a first switching device coupled to a ring node. The first switching device is responsive to a ring operation. A charge pump is connected to the ring node, and the charge pump provides a voltage offset to enhance a differential voltage betwe... | 09/06/2005 |
| 6928159 | Telephone for connection to a public telephone network In the case of the inventive telephone, telephone operating signals (bell signal, charge-unit signals and caller identifiers) and audio signals are processed together by an integrated circuit. This requires signal level matching to be performed for the individual si... | 08/09/2005 |
| 6925157 | Method for operating devices for transmitting high-bit-rate data on an extension line and arrangement having such devices for data transmission In a method and apparatus for data transmission and voice signal transmission on a subscriber line, in terminal devices located at least on a network side of the subscriber line, only those parts which evaluate a criterion indicating the beginning of the data transm... | 08/02/2005 |
| 6917646 | Circuit for exchanging communications over a transmission line A circuit for exchanging communications via a transmission line, including a detector for detecting a predetermined start-of-communication signal, a means for coupling the transmission line on the one hand to a transmit line to provide outgoing communications to the... | 07/12/2005 |
| 6914980 | Power switch device utilizing phone loop signals to control supply of electrical power to a telephony instrument A power switch device is used with a telephony instrument that is connected to a local phone loop via two telephone wires and that has two power lines for connection to a power source. The device includes a rectifier connected to the telephone wires, and a latching ... | 07/05/2005 |
| 6912282 | Enabling Cisco legacy power to support IEEE 802.3 AF standard power An apparatus and method for enabling Cisco legacy power to support IEEE 802.3 AF standard power. A network power system capable of delivering data terminal equipment power via a media dependent interface includes power source equipment according to Cisco legacy powe... | 06/28/2005 |
| 6862353 | System and method for providing power over a home phone line network A system and method is provided for supplying power over a home phone line network in a manner that is interoperable with other voice and data services operating on the same network. The system includes a power source coupled to the home phone line network. The powe... | 03/01/2005 |
| 6847705 | Apparatus for receiving voice signal and data and controlling method thereof An apparatus for receiving a voice signal and data, and a controlling method thereof, by which a voice telephone call can be made even in power failure, network error, or CPU error, comprises: a splitter for dividing data transmitted from a data transmission unit in... | 01/25/2005 |
| 6842520 | Telephone A telephone comprises an acoustic alarm, conversation members, first control means for the acoustic alarm, second control means for the conversation members, first supply means and second supply means for absorbing energy from a telephone line, the first supply mean... | 01/11/2005 |
| 6842516 | Digital adaptive filter and acoustic echo canceller using the same To achieve an improved convergence behaviour for, e.g., echo cancellation there is provided a digital adaptive filter which includes a filter coefficient update means to successively update filter coefficients in accordance with an input signal, an estimated power o... | 01/11/2005 |
| 6819760 | Adaptive energy detector gain control in physical layer transceiver for home telephone wire network A novel physical layer transceiver is provided for receiving data transmitted via residential wiring. The transceiver includes an input circuit for receiving an incoming pulse signal, and an energy detector responsive to the incoming pulse signal for producing a pul... | 11/16/2004 |
| 6813340 | Ringing SLIC fault handling A line card or other telephone or communications interface provided with a ringing SLIC outputs relatively high voltage, such as in excess of about 90 volts, and/or relatively high current such as in excess of about 20 milliamps during normal use, but decreases the ... | 11/02/2004 |
| 6778665 | Distribution of current draw in a line powered DAA A line powered data access arrangement (DAA) is disclosed which adaptively allows proper operation with power supplied from a telephone line as conditions warrant, while at the same time satisfying the relevant requirements of many countries. In the line powered cod... | 08/17/2004 |
| 6763109 | Copper based interface system and regulated power source Method and apparatus for providing a regulated and current limited power source to support bidirectional telephone delivery circuitry and methods for a multiplicity of telephone subscriber lines to a downstream distribution terminal using only two preexisting transm... | 07/13/2004 |
| 6760437 | Analog modem overcurrent protection An overcurrent protection circuit for an analog modem which uses passive-device features during normal operation to minimize modem signal noise and distortion, and active-device features when inadvertently connected to a line having excessive line current. ... | 07/06/2004 |
| 6754339 | Message transmission system A message transmission system having at least one subscriber's terminal device that is connected by way of a subscriber's line that is comprised of a first and second lead, with a subscriber's interface circuit (SLIC), preferably integrated, which comprises a loop d... | 06/22/2004 |
| 6735305 | Detection of low tip/ring currents in a line powered DAA A line powered data access arrangement (DAA) is disclosed which adaptively allows proper operation with power supplied from a telephone line as conditions warrant, while at the same time satisfying the relevant requirements of many countries. In the line powered cod... | 05/11/2004 |
| 6728373 | Differential output stage for electronic equipment providing a remote power feed to a terminal The stage includes two channels each connecting an input to an output. Each channel includes a first device for adding to the input voltage of the channel concerned a feedback voltage from the other channel to the channel concerned. For remote power feeding a termin... | 04/27/2004 |
