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Kotonoha Akane & Kotonoha Aoi

Official illustration, Synthesizer V
Developer(s)	AI, Inc. AH-Software Co. Ltd.
Initial release	April 25, 2014
Stable release	AI VOICE 2: Kotonoha Akane ＆ Aoi / December 22, 2023
Operating system	see #Development
Available in	Japanese, English, Mandarin
Type	Vocal Synthesizer Application
Website	https://aivoice.jp/character/kotonoha/

Kotonoha Akane & Aoi (Japanese: 琴葉茜・葵) are a pair of Japanese VOICEROID+ voicebanks released 25 April 2014. They were produced by AI, Inc. using AITalk [ja] and distributed by AH-Software, with voiced by Yui Sakakibara.

Development

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 A.I.VOICE [ja] 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 [ja] 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 NEUTRINO [ja]'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".

References

1. ^ 「それええやん」関西弁で話す「VOICEROID+ 琴葉 茜・葵」. ASCII (in Japanese). 2014-03-27. Archived from the original on 2019-05-07. Retrieved 2020-12-26.
2. 読み上げソフトのベストセラー※がついにバージョンアップ！『VOICEROID2 結月ゆかり』『VOICEROID2 琴葉 茜・葵』2017年6月9日発売. 株式会社AHS (Press release) (in Japanese). 2017-04-25. Archived from the original on 2020-08-11. Retrieved 2020-12-26.
3. エーアイ、「A.I.VOICE（TM）」を2/22販売開始 初回特典つき製品の予約は1/14開始. Dreamn News (Press release) (in Japanese). 2020-12-18. Archived from the original on 2021-01-13. Retrieved 2020-12-26.
4. エーアイ、個人向け英語音声読み上げソフトを12/10発売開始 「A.I.VOICE Kotonoha Akane ＆ Aoi English」. サンスポ (Press release) (in Japanese). 2021-11-04. Archived from the original on 2021-11-04. Retrieved 2021-11-04.
5. A.I.VOICEの中国語版読み上げソフト「Kotonoha Talk」9/22国内発売開始. PR Times (Press release) (in Japanese). 2022-08-26. Archived from the original on 2022-10-19. Retrieved 2022-09-10.
6. 株式会社エーアイ (2020-06-26). エーアイの琴葉姉妹が歌う！ 新世代歌声合成ソフト「Synthesizer V 琴葉 茜・葵」7/30発売. Dreamn News (Press release) (in Japanese). Archived from the original on 2020-07-03. Retrieved 2020-12-26.
7. NEUTRINO 琴葉 茜・葵ボイスソングライブラリについて. AI (Press release) (in Japanese). 2021-12-27. Archived from the original on 2021-12-28. Retrieved 2021-12-28.
8. クリムゾンテクノロジー株式会社 (2021-10-12). 「Voidol - Powered by リアチェンvoice -」追加ボイスモデルを発売. JIJI (Press release) (in Japanese). Archived from the original on 2021-11-01. Retrieved 2021-10-29.
9. 野澤佳悟 (2022-03-25). 誰でも「結月ゆかり」「琴葉 茜・葵」になれる声変換ソフト (Press release) (in Japanese). AVwatch. Archived from the original on 2022-06-23. Retrieved 2022-03-25.
10. "A.I.Voice Kotonoha Akane & Aoi English". A.I.Voice.

• Fictional characters introduced in 2014
• Fictional singers
• Japanese idols
• Japanese popular culture
• Fictional twins