Abstract: A roaming videoconferencing (VTC) system incorporates a portable VTC device with client bridge wireless connectivity that couples to the closest access point (AP) assembly with FCC compliant, enhanced range. Use of APs in combination with amplified directional antennas is successfully demonstrated for two-way VTC, even given their generally-known low Effective Isotropic Radiated Power (EIRP ) and half-duplex broadcasting. Optional video, audio and data wireless and capabilities are incorporated into the portable VTC device. Facilities that have a connection to Internet or an ISDN public switched telephone network may thus flexibly provide high-quality VTC to widely spaced parts of the facilities, grounds or work site without the inconvenience or expense of placement of ISDN lines.

Abstract: An error correction circuit for use with an analog-to-digital converter (ADC) comprising a first switch and a second switch and correction capacitor arranged in parallel and coupled to the first switch. The second switch is also coupled to ground and the correction capacitor is also coupled to a reference voltage wherein the first switch is arranged to be active during a hold mode of the ADC and the second switch is arranged to be active during a sample phase of the ADC.

Abstract: A roaming videoconferencing (VTC) system incorporates a portable VTC device with client bridge wireless connectivity that couples to the closest access point (AP) assembly with FCC compliant, enhanced range. Use of APs in combination with amplified directional antennas is successfully demonstrated for two-way VTC, even given their generally-known low Effective Isotropic Radiated Power (EIRP) and half-duplex broadcasting. Optional video, audio and data wireless and capabilities are incorporated into the portable VTC device. Facilities that have a connection to Internet or an ISDN public switched telephone network may thus flexibly provide high-quality VTC to widely spaced parts of the facilities, grounds or work site without the inconvenience or expense of placement of ISDN lines.