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Searching by sound for now has limited uses. There are a handful of applications, specifically for mobile devises that utilizes searching by sound. Shazam (service), Soundhound, Midomi, and others has seen considerable success by using a simple algorithm to match an acoustic fingerprint to a song in a library. These applications takes a sample clip of a song, or a user generated melody and checks a music library to see where the clip matches with the song. From there, song information will be pulled up and displayed to the user. These kind of applications is mainly used for finding a song that the user does not already know. Searching by sound is not limited so just identifying songs, but also for identifying melodies, tunes or advertisements, sound library management and video files. ==Acoustic Fingerprinting== The way these apps search by sound is through generating an acoustic fingerprint; a digital summary of the sound. A microphone is used to pick up an audio sample, which is then broken down into a simple numeric signature, a code unique to each track. Using the same method of fingerprinting sounds, when Shazam picks up a sound clip, it will generate a signature for that clip. Then it’s simple pattern matching from there using an extensive audio music database. The practice of using acoustic fingerprints is not limited to just music however, but other areas of the entertainment business as well. Shazam also can identify television shows with the same technique of acoustic fingerprinting. Of course, this method of breaking down a sound sample into a unique signature is useless unless there is an extensive database of music with keys to match with the samples. Shazam has over 11 million songs in its database.〔http://www.slate.com/articles/technology/technology/2009/10/that_tune_named.html〕 Other services such as Midomi and Soundhound allow users to add to that library of music in order to expand the chances to match a sound sample with its corresponding sound. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Search by sound」の詳細全文を読む スポンサード リンク
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