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:
Jun. 04, 2002
Filed:
Jun. 24, 1999
Don Roy Goldston, Mason, OH (US);
Marcus Matherne, West Chester, OH (US);
Ibiquity Digital Corporation, Columbia, MD (US);
Abstract
A method is provided for identifying a training baud in a digital audio broadcasting signal. The method includes the steps of receiving a plurality of carrier signals modulated by a plurality of data baud, wherein the data baud include normal baud and training baud. The data baud received on the carriers are compared with predetermined data signals to produce a plurality of difference signals. The difference signals are then used to produce a plurality of distance signals, which are combined to produce group distance signals. One of the group distance signals is selected and used to determine if the data baud corresponding to the selected group distance signal is a training baud or a normal baud. This determination is performed by storing successive selected group distance signals until at least one training baud has been received, and using the stored group distance signals to determine normal/training synchronization. The group distance signals correspond to data baud on predetermined groups of the carriers. Radio frequency receivers that utilize the above method are also disclosed.