This part of the game is essentially karaoke, but with scoring and realtime feedback. The gameplay is similar to SingStar: the game analyzes the pitch of each singer and scores the performance based on how precisely the song was performed. As a reference, the lyrics, the notes and the singer's pitch are displayed on screen as the song plays.
Performous does not attempt to clone SingStar but rather has unique features such as scrolling notes and precise singing pitch display as a wave drawn on screen. These allow the player to sing without interruptions and to easily correct his or her singing pitch to hit the notes precisely.
Performous does pitch detection with fast fourier transform (FFT) combined with a sophisticated post-processing algorithm. This system is able to operate well in extremely noisy environments, even when using very cheap microphones.
On Linux the game autodetects any connected SingStar microphones and uses them automatically. On other platforms and with other types of microphones (e.g. webcams or analog microphones connected to sound cards) a best-effort detection is done.
Songs need to be supplied in UltraStar or Frets on Fire format. Performous comes with a tool named 'ss_extract', for converting SingStar DVDs into UltraStar format.
... Singing games on video game formats pit multiple players against each other, or a single player against previous performances or a set standard ... the player's ability to maintain the proper pitch and duration for each note while singing along with a song whose lyrics are displayed on the screen ...
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