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:
Oct. 20, 1998
Filed:
Dec. 18, 1995
Nuggehally Sampath Jayant, Gillette, NJ (US);
Lucent Technologies Inc., Murray Hill, NJ (US);
Abstract
A digital audio broadcasting system incorporates a perceptual audio coder that encodes a digital audio signal for broadcast. A 'source label' is provided by controlling the perceptual audio coder in such a way that the number of coefficient samples, n, used in each transmission frame represents information about the source. For example, if the value of n is odd, then a binary '1' is transmitted, but if the value of n is even, then a binary '0' is transmitted. As a result, a low-bit rate 'source label' is transmitted over a number of frames. In a receiver, the source of the digital audio signal is identified by simply monitoring the value of n over the number of frames. More importantly, the value of n in each frame is required by a corresponding perceptual audio decoder, in the receiver, to correctly recover the digital audio signal. As a result, the 'source label' is inseparable from the encoded digital audio signal since any tampering of the value of n after transmission distorts not only the 'source label' but affects the recovery of the digital audio signal as well.