are a pair of Japanese VOICEROID+ voicebanks released 25 April 2014. They were produced by AI, Inc. using and distributed by AH-Software, with voiced by Yui Sakakibara.
Development Year Software Voicebanks Engine Application Operating system Text-to-speech 2014 Kotonoha Akane & Aoi (VOICEROID+) AITalk 3 Windows 2017 Kotonoha Akane & Aoi (VOICEROID2) Kotonoha Akane Kotonoha Aoi AITalk 4 Voiceroid 2 2020 Kotonoha Akane & Aoi (A.I.VOICE) Kotonoha Akane Kotonoha Aoi Kotonoha Akane Tsubomi Kotonoha Aoi Tsubomi AITalk 5 A.I.Voice Editor 2021 A.I.Voice Kotonoha Akane & Aoi English Kotonoha Akane (English) Kotonoha Aoi (English) 2022 Kotonoha Talk Chinese Kotonoha Akane（Chinese） Kotonoha Aoi（Chinese） 2023 Kotonoha Akane & Aoi (A.I.VOICE2) Kotonoha Akane (NV) Kotonoha Akane Tsubomi (NV) Kotonoha Aoi (NV) Kotonoha Aoi Tsubomi (NV) AITalk 6 A.I.Voice 2 Editor Singing voice synthesis 2020 Kotonoha Akane & Aoi (Synthesizer V Studio) Kotonoha Akane & Aoi Synthesizer V Standard Synthesizer V Studio 2022 Kotonoha Akane & Aoi Song Library (NEUTRINO) Kotonoha Akane Kotonoha Aoi Neutrino Voice conversion 2021 Kotonoha Akane & Aoi Voice Model for Voidol Kotonoha Akane Kotonoha Aoi R.C.voice Voidol 2022 Kotonoha Akane & Aoi (Seiren Voice) Kotonoha Akane & Aoi Seiren Voice Windows
Text-to-speech Kotonoha Akane & Kotonoha Aoi's VOICEROID+ voicebank was distributed by AH-Software and released on 25 April 2014. The VOICEROID2 voicebank released on 9 June 2017, added a Voice Style feature.
On 22 February 2020, a text-to-speech synthesizer software released the product "A.I.Voice Kotonoha Akane & Aoi", added two voicebanks with younger voices, Kotonoha Akane Tsubomi and Kotonoha Aoi Tsubomi. The English version released on 10 December 2021 and Chinese on 22, September, 2022.
Singing voice synthesis Kotonoha Akane & Aoi's shared singing library for Synthesizer V Studio produced by AH-Software released on June 26, 2020. The recommended rhythm is between 70 and 180 bpm, and the recommended range is between E3 and D5. The included scales are G ♯ 3, C ♯ 4, F ♯ 4, and C5 (falsetto).
The 's Kotonoha Akane & Aoi singing voice library have been available for free to users who purchase "A.I.Voice Kotonoha Akane & Aoi" since 25 April 2022. The recommended range for Kotonoha Akane is between mid1G and hiC (G3 to C5), with a recommended rhythm of 120 to 180 bpm, and the recommended genres are rock, pop music, etc.; The recommended range for Kotonoha Aoi is between mid1G and hiC (G3 to C5), with a recommended rhythm of 80 to 140 bpm, and the recommended genres are pop, folk music, etc.
Voice conversion The voice model library of Kotonoha Akane & Aoi for an AI voice conversion application Voidol was produced by Crimson and released on 12 October 2021. Released on 17 May 2022, the voicebank of Kotonoha Akane & Aoi for a voice conversion software Seiren Voice was produced by Dwango.
Character Kotonoha Akane & Aoi's character art were designed by Japanese illustrator Yoshida Yoshitsugi. They are a pair of twin sisters.
Akane is used to speaking in the Kansai dialect for she lived in Kansai region for a long time, and Aoi has standard intonation. Akane is "outgoing and cheerful" while Aoi is "calm and reliable".
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