Intersil Americas Inc.

Intersil Corporation

Harris Corporation

Other

Leonel Ernesto Enriquez

Douglas Lawton Youngblood

Edward A Berrios

George S Bajor

Joseph A Czagas

Chris A McCarty

Gabriel Julio Uscategui

An impaired person care system which includes a reconfigurable powered wheelchair operating in conjunction with a segmented bed having a main bed section and multiple reconfigurable bed sections. The wheelchair has back, seat and leg sections configurable to an upright sitting position or a horizontal lying-down bed resting position. In the sitting position the wheelchair is positionable over a regular commode; in the lying-down position the wheelchair is positionable on the multiple reconfigurable bed sections and movable vertically in response to corresponding movement of the reconfigurable bed sections to the level of the main bed section. The wheelchair also has an opening in the seat section with allowing unobstructed passage of fecal waste from bowel movements when the wheelchair is positioned over the commode.

Impaired person care system and method

A voltage regulator circuit arrangement limits the DC voltage applied to a tip and ring amplifiers of a subscriber line interface circuit (SLIC), each of which has a first polarity input coupled to a first current flow path to which a DC input (battery) voltage is coupled. A first current source supplies a first current derived via a low pass filter path from that flowing through the first current flow path to a second polarity input node of the tip amplifier, while a second current source supplies a similarly low pass filter path-derived second current to a second polarity input node of the ring amplifier. A voltage regulator is coupled with the first current flow path and is operative to regulate the voltage at the first polarity inputs of the tip and ring amplifiers to a regulated voltage value Vreg, so that the magnitudes of the first and second currents are based upon the regulated voltage value Vreg.

Active mode line voltage regulator for ringing subscriber line interface circuit

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 section. An input signal receiving unit of the high voltage analog section conditions input voice and low voltage signaling and ringing signals from the mixed signal section, for application to a dual mode, programmable gain, tip/ring amplifier coupled to the loop. A sense amplifier at the output of the tip/ring amplifier is through an auxiliary amplifier to an analog feedback monitor port for closing a loop to synthesize the circuit's output impedance.

Programmable subscriber line circuit partitioned into high voltage interface and digital control subsections

A mode-dependent, battery-coupling switch for a subscriber line interface circuit (SLIC) selectively adjusts its current requirements to provide optimal current handling capability irrespective of the mode of operation of the SLIC. Where current demands of the SLIC are relatively minimal (e.g., on-hook idle mode), the bias is set at a relatively small, default value. During high current demand, such as ringing and off-hook signaling, the bias is set at a relatively large value, to maintain a low voltage drop across the battery-coupling switch.

Mode-dependent, multiple bias-driven battery switch for subscriber line interface circuit

A subscriber line interface circuit contains a high voltage analog section, and a low voltage and digital signal processing section, that monitors and controls the high voltage analog section. The high voltage analog section includes a dual mode tip/ring amplifier unit coupled to a subscriber loop pair, and an input signal receiving unit, that conditions input voice and low voltage signaling and ringing signals from the mixed signal section. Attributes of and/or enhancements to the high voltage section are used to improve the operational performance of the subscriber line interface circuit, in particular, low noise, low power, wide-bandwidth and wide dynamic range characteristics.

Enhanced high voltage interface for partitioned subscriber line interface circuit

A voltage reference filter for a subscriber line interface circuit removes unwanted noise on a DC reference voltage sourced by a device, such as a codec, and employed by the subscriber line circuit as a differential mode voltage baseline. The DC reference voltage is coupled via a high pass filter to the sense amplifier. The filter blocks the DC component of the reference voltage and passes noise components to the sense amplifier. The reference port of an amplifier between the sense amplifier and a codec receives the same (noisy) reference voltage AC-coupled to the sense amplifier, and performs common mode rejection of noise components riding on the DC reference.

Voltage reference filter for subscriber line interface circuit

A bandgap reference-based voltage and current generator has a distributed circuit architecture, to reduce the number of voltage dropping components between voltage supply rails containing bandgap voltage generator circuitry. Base current error compensation circuitry is incorporated into current mirror circuits of the generator to yield a composite current having a desired component, defined exclusively in accordance with the desired bandgap voltage, and a base error component containing the desired bandgap voltage, but modified by a second base current error. By differentially combining these two components, the multiple port output current mirror stage removes the base error component of the composite current, leaving only the desired bandgap-based component at each of plural precision output current ports.

Bandgap reference circuit for low supply voltage applications

A transmission channel for a subscriber line interface circuit comprises a front end, tip/ring current-sensing transimpedance stage, containing relatively low valued tip and ring sense resistors coupled in circuit with tip and ring paths of a telecommunication wireline pair. The front end transimpedance stage transforms differential tip and ring input currents sensed by the tip and ring sense resistors into a single ended voltage, which is coupled to a transconductance amplifier filter/gain stage. The filter/gain stage is configured to provide a programmable output impedance, and converts the voltage from the current-sensing transimpedance stage into an output transmission voltage for application to a selected one of a current-sense, voltage-feed, or voltage-sense, voltage-feed telecommunication circuit.

Precision, low-power current-sense transmission channel for subscriber line interface circuit, programmable with single ended impedances and capable of exhibiting a voltage sense response

A controllably switched arrangement selectively couples multiple circuit functions, such as reverse polarity detection, ring-trip and line voltage measurement, of a telecommunication card to the same external programming component (e.g., capacitor) on an as needed basis, by means of associated coupling circuits and a controlled switching circuit. The coupling circuits are controllably enabled/disabled in association with the particular circuit function required, while the controlled switching circuit selectively connects each coupling circuit with the external component. Through combined control of the coupling circuits and the switching circuit, respectively different circuit functions can be implemented with the same external component.

Controlled switching mechanism for accomplishing soft polarity reversal, ring-trip filtering, and line voltage measurements in a subscriber line interface circuit using common capacitor

A subscriber line interface circuit (SLIC) drive arrangement controllably adjusts DC biasing and overhead voltage characteristics for wireline pair that is optimized for each mode of operation of the SLIC. Respective tip and ring DC drive voltages supplied by tip and ring drive amplifiers are controlled so that the differential DC voltage across the wireline pair has a first constant value during on-hook mode, in which DC loop current may vary between zero and a first DC loop current threshold value associated with a transition from on-hook mode toward off-hook mode. During a transition between on-hook mode and off-hook mode, the tip and ring DC drive voltages are controlled so as to vary the differential DC drive voltage in proportion to monitored DC loop current. During off-hook mode, the differential DC voltage is set at a second fixed value. If an upper DC loop current threshold is reached during off-hook mode, the differential DC voltage is sharply reduced from its second constant value.

Biasing arrangement for optimizing DC feed characteristics for subscriber line interface circuit

A circuit arrangement prevents clipping of pulse metering (teletax) signals in a telephone line card channel that results from the differential impedance between a subscriber line interface circuit (SLIC) and the line at the frequency band of teletax signals. The circuit arrangement is configured to sense pulse metering signals through a delay circuit, which is coupled to a reflected signal cancellation circuit. The reflected signal cancellation circuit contains a transconductance amplifier circuit that generates a pair of complementary polarity output currents representative of the sensed teletax signal. One of these output currents is fed back to a programmed impedance element in the transmission channel path of the SLIC so as to effectively cancel the reflected teletax signal.

Growing community of inventors

Melbourne Beach, FL, United States of America

Leonel Ernesto Enriquez