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:
May. 20, 2003
Filed:
May. 28, 1999
Ronald E. Ham, Austin, TX (US);
Cisco Technology, Inc., San Jose, CA (US);
Abstract
A system for processing an input signal communicated on a telephone line includes an input node to receive the input signal. The input signal comprises a first component associated with a first frequency band, a second component associated with a second frequency band higher than the first frequency band, and a third component associated with a third frequency band higher than the second frequency band. A first filter coupled to the input node receives the input signal, attenuates the first and third components, and communicates a first signal substantially comprising the second component. A second filter coupled to the input node receives the input signal, attenuates the second component, and communicates a second signal substantially comprising the first and third components. A third filter coupled to the second filter receives the second signal, attenuates the third component, and communicates a third signal substantially comprising the first component. An intermediate node coupled between the second and third filter may also couple to a fourth filter having an input capacitance that limits the ability of the third filter to pass the second component. In a more particular embodiment, the system is a POTS splitter, the first component is an analog telephone signal, the second component is a tax/billing tone, and the third signal is a digital data signal.