Tuesdays the USPTO issues new patents. Today's Spotlight Patents concern aspects of digital fingerprinting and digital watermarking. Assigned to Thomson, the first of today's patents addresses techniques for fault detection using embedded watermarks. Assigned to Rovi, the second patent addresses techniques for for audio recognition.
8,352,810, "Fault detection using embedded watermarks," assigned to Thomson Licensing (FR).
Detection of faults in a transmitted signal stream occurs by recovering, from the information stream, a water mark embedded in the stream prior to transmission. The embedded watermark has data characteristic of stream quality. Thereafter, the at least one watermark property is analyzed to detect faults in the received information stream.
8,352,259, "Methods and apparatus for audio recognition," assigned to Rovi Technologies Corporation.
Frequencies from a set of audio source files are extracted and measured across the set to determine a range of each of the frequencies. Stable frequencies of the frequencies are detected based on each range and used to create a stable frequency family. An unknown recording is mapped to the stable frequency family to form an audio fingerprint.