The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 18, 2000
Filed:
Jun. 04, 1999
Peter Gade Ruether, Longmont, CO (US);
Carolyn Gaye Ford, Louisville, CO (US);
Tyco Electronics Corporation, Middletown, PA (US);
Abstract
A codec supports PCM modem communications (e.g., V.90, X2, or K56flex protocols) over a universal digital loop carrier (UDLC) having an analog interface to the central office (CO). The codec includes an analog-to-digital converter (ADC) that is synchronized to the CO clock, and an equalizer that has been trained to provide a transfer function to compensate for the distortion introduced by the CO line interface reconstruction filter and connecting circuits, to minimize resampling error. These features allow the codec to output a PCM stream that accurately reproduces the PCM data at the central office, at data rates sufficient to support PCM modem communications, as well as voice and conventional modem communications. The equalizer can be trained using a remote training unit that transmits a predetermined sequence of training signals to the equalizer. The connection to the training unit can be over a local central office telephone call or over a wide area network that can be accessed through a switched connection. In one embodiment, the equalizer comprises a feed-forward linear equalizer followed by a decision feedback equalizer.