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. 17, 2001
Filed:
Mar. 18, 1997
Kerry C. Glover, Wylie, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A metric circuit (,) and method for use in a viterbi detector (,) are provided. The metric circuit (,) provides a transition signal (,) to a trellis block (,) during a first period and a second period. The transition signal (,) includes a negative transition signal and a positive transition signal. The metric circuit (,) includes a first adder circuit (,), a second adder circuit (,), a first comparator (,), a second comparator (,), an odd sample/hold circuit (,), and an even sample/hold circuit (,). The metric circuit (,) receives a discrete signal and a threshold value at the first adder circuit (,) and the second adder circuit (,). The first is adder circuit (,) generates a first sum and the second adder circuit (,) generates a second sum. The first comparator (,) compares the first sum to an odd metric value, stored in the odd sample/hold circuit (,), during the first period, and compares the first sum to an even metric value, stored in the even sample/hold circuit (,), during the second period. The second comparator (,) compares the second sum to the odd metric value during the first period, and compares the second sum to the even metric value during the second period. The value of the odd metric value and the even metric value are replaced with either the first sum or the second sum only when specified conditions are met.