Shazam

-Abdulshafil Ahmed -Steven Lewis-Rick Huang

What is Shazam?

• - Mobile phone based application that listens to music and compares against a database.

Technology

• Takes 10 second sample• Catalogs the spectrogram (fingerprint)• Compares against large database• If match is found,– Gives song information– Offers immediate purchase

Technology

• Pair of peaks: peak + anchor • Hash table searching O(l), collision reduced by

having extra key by orders of magnitude • Robustness to interference?

Societal Impact

• Introducing people to new music. • Hear a song once, have it forever

Economic Impact

• Improves music sales• Music sales are a convenient impulse buy• More efficient advertisement of music.• http://www.youtube.com/watch?

v=ppJAkN4m9bY

Conclusion

• Turns the world into a record store

References

• http://www.shazam.com/music/web/home.html

• http://en.wikipedia.org/wiki/Hash_function• http://laplacian.wordpress.com/

2009/01/10/how-shazam-works/