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5262results about "Electrophonic musical instruments" patented technology

System and methods for recognizing sound and music signals in high noise and distortion

A method for recognizing an audio sample locates an audio file that most closely matches the audio sample from a database indexing a large set of original recordings. Each indexed audio file is represented in the database index by a set of landmark timepoints and associated fingerprints. Landmarks occur at reproducible locations within the file, while fingerprints represent features of the signal at or near the landmark timepoints. To perform recognition, landmarks and fingerprints are computed for the unknown sample and used to retrieve matching fingerprints from the database. For each file containing matching fingerprints, the landmarks are compared with landmarks of the sample at which the same fingerprints were computed. If a large number of corresponding landmarks are linearly related, i.e., if equivalent fingerprints of the sample and retrieved file have the same time evolution, then the file is identified with the sample. The method can be used for any type of sound or music, and is particularly effective for audio signals subject to linear and nonlinear distortion such as background noise, compression artifacts, or transmission dropouts. The sample can be identified in a time proportional to the logarithm of the number of entries in the database; given sufficient computational power, recognition can be performed in nearly real time as the sound is being sampled.

Systems and methods for modifying broadcast programming

A system for selecting, erasing or reproducing program recordings using marking and descriptive data which is transmitted to a client location from a remote processing location. A database of identification signals specifying the characteristics of a known programming is maintained at a remote processing location. In a first embodiment, selected identification signals are downloaded from the database to the client location and are used by a processor at the client location to identify desired programming within a locally stored collection of previously received broadcast programming signals. In a second arrangement, locally stored programming signals are processed to extract identification data which is uploaded from the client location to the remote processing location for comparison to the database, and information describing the content of the matching programs is returned to the client location for use as a program guide, facilitating the selection, permanent storage, or playback of desired program records and/or the erasure of undesired programming. To conserve local storage space, identified program records may be uploaded and stored at the remote processing location, or shared program records in a central library may be made available for remote playback after an the identity of equivalent locally stored programming is confirmed.
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