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Vocaloid (ボーカロイド Bōkaroido) is a singing voice synthesizer software. Its signal processing part was developed through a joint research project led by Kenmochi Hideki at the Pompeu Fabra University in Barcelona, Spain, in 2000, and originally was not intended to be a full commercial project. Backed by the Yamaha Corporation, it developed the software into the commercial product "Vocaloid".

The software enables users to synthesize "singing" by typing in lyrics and melody. It uses synthesizing technology with specially recorded vocals of voice actors or singers. To create a song, the user must input the melody and lyrics. A piano roll type interface is used to input the melody and the lyrics can be entered on each note. The software can change the stress of the pronunciations, add effects such as vibrato, or change the dynamics and tone of the voice.

Various voice banks have been released for use with the Vocaloid synthesizer technology. Each is sold as "a singer in a box" designed to act as a replacement for an actual singer. As such, they are released under a moe anthropomorphism. These avatars are also referred to as Vocaloids, and are often marketed as virtual idols; some have gone on to perform at live concerts as an on-stage projection.

The software was originally only available in English starting with the first Vocaloids Leon, Lola and Miriam by Zero-G, and Japanese with Meiko and Kaito made by Yamaha and sold by Crypton Future Media. Vocaloid 3 has added support for Spanish for the Vocaloids Bruno, Clara and Maika; Chinese for Luo Tianyi and Xin Hua; Korean for SeeU and Uni.

The software is intended for professional musicians as well as light computer music users. Japanese musical groups such as Livetune of Toy's Factory and Supercell of Sony Music Entertainment Japan have released their songs featuring Vocaloid as vocals. Japanese record label Exit Tunes of Quake Inc. also have released compilation albums featuring Vocaloids. Artists such as Mike Oldfield have also used Vocaloids within their work for back up singer vocals and sound samples.

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Vocaloid's singing synthesis (ja) technology is generally categorized into the concatenative synthesis in the frequency domain, which splices and processes the vocal fragments extracted from human singing voices, in the forms of time-frequency representation. The Vocaloid system can produce the realistic voices by adding vocal expressions like the vibrato on the score information.Initially, Vocaloid's synthesis technology was called "Frequency-domain Singing Articulation Splicing and Shaping" (周波数ドメイン歌唱アーティキュレーション接続法 Shūhasū-domain Kashō Articulation Setsuzoku-hō) on the release of Vocaloid in 2004, although this name is no longer used since the release of Vocaloid 2 in 2007.