Such services typically rely on your smartphone's microphone to record a sample of music and then compare
that sample against a database of songs.
Not exact matches
Using a
sample size of 11,860 adults in the United States (5,922 men and 5,938 women) obtained from the National Violence
Against Women Survey's
database, the researchers sought to challenge a sociological theory that explains that men are more likely to respond to sexual assault with anger and by engaging in criminal activity, while women are more likely to respond with depression and sadness.
This can include identifying microscopic amounts of blood, saliva or semen on evidence; carrying out a DNA analysis on any
samples found and comparing the resulting profile
against the UK's DNA
Database; or using microscopy to see if two fibres have similar characteristics.
They argued that the stigma attaching to having one's DNA on the «criminal
database» interfered with their day to day living: knowing that their most intimate information was held by the government in order that it could be run
against crime scene
samples or used for other unspecified research purposes.
Devices using biometric identifiers attempt to automate this (FR) process by comparing the information scanned in real time
against an «authentic»
sample stored digitally in a
database.
It
samples small bits of audio, creating a digital «fingerprint» of it, and comparing it
against a a
database on their server to identify the show or movie.