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:
Sep. 05, 2006
Filed:
Jun. 23, 2003
Sigang Qiu, Raleigh, NC (US);
Prashant Pratap Tawade, Raleigh, NC (US);
Vedavalli G. Krishna, Raleigh, NC (US);
Wesley H. Smith, Raleigh, NC (US);
Mandayam G. Krishnan, Raleigh, NC (US);
BO G. Zhang, Raleigh, NC (US);
Sigang Qiu, Raleigh, NC (US);
Prashant Pratap Tawade, Raleigh, NC (US);
Vedavalli G. Krishna, Raleigh, NC (US);
Wesley H. Smith, Raleigh, NC (US);
Mandayam G. Krishnan, Raleigh, NC (US);
Bo G. Zhang, Raleigh, NC (US);
Intel Corporation, Santa Clara, CA (US);
Abstract
Embodiments of the invention provide methods and apparatuses to determine the characteristics of a local loop using the multi-tone line-probing signals of a standard voice-based modem. For one embodiment, the multi-tone, line-probing signals of a voice-band modem are transmitted over a local loop and received at a standard voice band modem. Discrete Fourier transform values are determined for each of two or more frequencies of the plurality of frequencies of the multi-tone signals. A set of discrete Fourier transform values corresponding to a set of high frequencies is summed to obtain a first value and a set of discrete Fourier transform values corresponding to a set of low frequencies is summed to obtain a second value. A power ratio is determined by dividing the first value by the second value. The power ratio is then used to determine a characteristic of the local loop.