New patents are issued by the USPTO on Tuesdays. This week's Spotlight Patents concern aspects of digital watermarking and digital fingerprinting. Assigned to TLS Corp, the first patent addresses techniques for inserting watermarks into audio signals that have speech-like properties. Assigned to The Johns Hopkins University, the second patent addresses techniques for efficient identification of code similarity.
10,152,980, "Inserting watermarks into audio signals that have speech-like properties," assigned to TLS Corp.
A method to watermark an audio signal may include receiving watermark data payload information, converting the watermark data payload information into a watermark audio signal including one or more watermark messages corresponding to the watermark data payload information, and inserting the one or more watermark messages into multiple spectral channels of the audio signal, wherein each of the multiple spectral channels occupies a different frequency range, wherein bandwidth of a first spectral channel located in a first frequency region is smaller than bandwidth of a second spectral channel located in a second frequency region, and wherein bandwidth of a spectral channel, from the multiple spectral channels, is equal to a number divided by the time duration of a respective symbol, from the multiple symbols, in the spectral channel, wherein the number is in the range of 0.7 to 2.5.
10,152,518, "Apparatus and method for efficient identification of code similarity," assigned to The Johns Hopkins University.
A method for identifying similarity between query samples and stored samples in an efficiently maintained reference library may include receiving a binary query sample and processing the binary query sample via operations including producing a query sample fingerprint from the binary query sample, scoring the query sample fingerprint with each previously stored fingerprint in the reference library to produce a matching score, and for each previously stored fingerprint for which the matching score meets or exceeds a predetermined threshold, reporting a corresponding reference sample unique identifier associated with the previously stored fingerprint and the matching score. Each previously stored fingerprint in the reference library has been determined, prior to storage, as not being duplicative of another fingerprint in the reference library.