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. 26, 2005
Filed:
Mar. 16, 2001
Jin-nan Liaw, San Jose, CA (US);
Haibin Liu, San Lorenzo, CA (US);
James Hon, Pleasanton, CA (US);
Andrew L. Norrell, Nevada City, CA (US);
Jin-Nan Liaw, San Jose, CA (US);
Haibin Liu, San Lorenzo, CA (US);
James Hon, Pleasanton, CA (US);
Andrew L. Norrell, Nevada City, CA (US);
GoDigital Networks Corporation, Fremont, CA (US);
Abstract
Method and apparatus for providing an improved quality voice band channel equalization in telecommunication systems employing v.90 transmission standard in which PCM modem signals passing through a digital-to-analog and analog-to-digital conversion processes between a central office switch and a multiple subscriber access system may be reconstructed with improved quality at the A/D converter side by variably adjusting the gain between the digital-to-analog conversion process at the central office switch and the analog-to-digital conversion process at the multiple subscriber access system, and low pass filtering the signal using a second order low pass notch filter to provide a boost of 6 dB at a frequency of 4 KHz.