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Koharu Rikka
SynthV Studio
VOICEROID
CeVIO AI
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This article is about the Synthesizer V Studio software known as a voice database. If you are looking for the Synthesizer V character then click here.

History[]

2020[]

A crowdfunding campaign was launched on May 28, 2020 to fund for Koharu Rikka's VOICEROID2 voicebank and its stretch goals, which included the final stretch goal for 25 million yen: a singing voicebank.[1] This amount was reached on June 6, about a week and a half after the campaign began, but the actual synthesizer was not specified at the time.[2] On June 26, Synthesizer V Studio was revealed as her singing engine.[3] On August 8, it was announced that recording for her Synthesizer V bank started.[4]

On October 30, Rikka was announced that she would be developed for the CeVIO AI voice synthesis engine for speech. For singing, she was confirmed to have not only a Standard voice database but also the newly introduced AI type of voice database. She was slated for a Spring 2021 release.[5] [6]. In a press release from TOKYO6 ENTERTAINMENT, it was announced that the reason why Rikka was in production for CeVIO AI was due to the fact that it also used AI technology, unlike VOICEROID.[7]

2021[]

On February 18, 2021, during an AH-Software Co. Ltd. Livestream, Rikka's Synthesizer V AI voice database was showcased.[8][9] Following the stream, AH-Software announced a special campaign on Twitter allowing users to apply via DM to receive a physical copy of Synthesizer V Studio Pro and Synthesizer V Koharu Rikka AI Complete.[10]

Rikka officially released on March 18 for both CeVIO AI and Synthesizer V Studio. Lite versions of the Synthesizer V voice databases were also released on the same day via AH-Software's website.[11][12]

2022[]

On March 24, 2022, Rikka was confirmed to be receiving a physical box for only her AI voice database on April 13. This was due to high demand for AI-type voices.[13] On March 26, the release of Synthesizer V Studio version 1.6.0 brought new features: Vocal Mode and Instant Mode. TOKYO6 announced that these features would be brought to Rikka and Natsuki Karin later due to the need of making adjustments to the voice databases.[14] On May 20, it was announced on TOKYO6's livestream that Rikka would be receiving a larger-scale update to match Karin's and Hanakuma Chifuyu's quality. This would include additional recordings to improve her range with Vocal Mode.[15] The updates covered the following:

  • Improved voice quality by updating the acoustic model
  • More faithful to the original recordings' pitch
  • Voice was clearer and connections were smoother
  • Pronunciation and vowels were made clearer
  • Support English, Mandarin Chinese, and Japanese
  • Improvements made to the Auto Pitch Function

It was also noted that additional songs recorded by Yoshino Aoyama were added to Rikka's data which was necessary for Vocal Mode.[16]

On July 21, Rikka was one of the only AI voice databases not to receive an update for HDVM compatibility (along with Xingchen Infinity).[17] Similarly, she was also the only AH-Software Co. Ltd. AI voice database to not receive Vocal Modes in this update. However, her official Twitter account assured fans that they were still in development and would be implemented at a later date.[18]

Updates[]

Koharu Rikka AI v102 - March 24, 2021[19] 

Better pronunciation of rare phonemes and minor performance enhancements.

Koharu Rikka AI v105 - June 18, 2021[20][21] 

This update supports the 3rd generation of AI singing voice synthesis.

Koharu Rikka AI v113 - December 16, 2021[22] 

This update improves audio characteristics and synthesis quality.

Koharu Rikka AI v115 - December 23, 2021[23] 

A free update for Koharu Rikka AI was released following the Synthesizer V Studio 1.5.0 update. This enables her to support cross-lingual singing synthesis.


Voice Database Information[]

Demonstrations[]

Synthesizer V Studio Standard[]

Demonstrations

Demo Crossfade (AIのカタチ (AI no Katachi), The Everlasting Guilty Crown, オドッテ☆モロテ (Odotte ☆ Morote)) Niconico YouTube
AIのカタチ (AI no Katachi) Niconico YouTube bilibili
オドッテ☆モロテ (Odotte ☆ Morote) Niconico YouTube bilibili
MIRA Niconico YouTube bilibili
The Everlasting Guilty Crown Niconico YouTube
シャドーマンショー (Shadowman Show) Niconico YouTube bilibili
ローファー (Loafer) Niconico YouTube

Synthesizer V AI[]

Demonstrations

あの星を探して (Ano Hoshi o Sagashite) Niconico YouTube
あの星を探して (Ano Hoshi o Sagashite) - Short version w/ Automatic Pitch function Niconico YouTube
ミゾオチ (Mizoochi) Niconico YouTube bilibili
AIのカタチ (AI no Katachi) Niconico YouTube bilibili
大腿四頭筋 (Daitai Shitoukin) Niconico YouTube bilibili
ジコショーカイ (Jikoshoukai) Niconico YouTube bilibili
已己巳己 (Ikomiki) Niconico YouTube bilibili
デラシネ (Déraciné) Niconico YouTube bilibili
デジタル$ゴールド (Digital $ Gold) Niconico YouTube bilibili

Voice Databases[]

Product Information
Optimum
  Range: A3 ~ G5  Pitch Group: C4, E4, G#4, B4[24]

Versions
  Lite Version Available?: Yes  Starter Pack Available?: Yes  Web Version Available?: No

Package details as noted:
Rikka is a feminine Japanese voice database that is designed to be suitable for all genres. She has a bright and energetic voice that has solid vocal support, and can also be breathy and nuanced.[25]

Vocal traits as noted:
  • Rikka's voice was advertised to be versatile.
  • Rikka was noted to have a rich middle range.[26]

Software issues as noted:
As the Lite voice databases are generally restricted to monopitch (one pitch) only, Rikka's range is noted to be E4 in this version.

System requirements as noted:

Hardware Requirements:

  • CPU: Intel Core i3 or higher
  • RAM: 2GB or higher
  • Disk Space: 1 GB or higher (for installing one voice database)
    • The amount of space required depends on the number of voice databases installed.
  • Display: 1280 x 800 or higher

Software Requirements:

  • Operating System:
    • Windows 10/8.1
    • Mac OS X: 10.11 or higher
    • Linux Ubuntu 16.4 or higher

Other:

  • DVD-ROM Drive (physical edition only)
  • Sound card
  • Internet connection is necessary for activation and obtaining updaters.

License agreements as noted:
  • TOKYO6 ENTERTAINMENT's Character Usage Guidelines - Japanese
  • AH-Software's End User License Agreement - Japanese
  • AH-Software's End User License Agreement - English
  • Regarding the Lite version:
    • AH-Software does not accept technical inquiries regarding free software nor do they guarantee or support the operation of all free software.
    • AH-Software is not liable for any damages (including loss of data) caused by using free software. Users are cautioned to use the free software at their own risk.
    • The program may not be transferred, sold, rented, distributed or rented without AH-Software's permission, regardless of whether it is paid or free of charge.
    • Reverse engineering, including modification, decompilation, and disassembly, of their program for any purpose is prohibited.
    • Koharu Rikka Standard Lite may not be used commercially in any way
    • When using the Lite version of this voice database, "This work uses the Lite version" must be mentioned on any uploads.

Voice database sample

Product Information
Optimum
  Range: G3 ~ F#5

Versions
  Lite Version Available?: Yes  Starter Pack Available?: Yes  Web Version Available?: No

Package details as noted:
Rikka is a feminine Japanese voice database that is designed to be suitable for all genres. She has a bright and energetic voice that has solid vocal support, and can also be breathy and nuanced. As expected of an AI voice database, this enables Rikka to sing with a more human-like and realistic voice.

Vocal traits as noted:
  • Rikka's voice was advertised to be versatile.
  • Rikka was noted to have a rich middle range.

Phonetic notes as noted:
  • On December 23, 2021, with the announcement of Synthesizer V Studio 1.5.0, all AI voice databases would be able to use cross-lingual singing synthesis. This allows Rikka AI to be able to sing in not only Japanese but also in English and Mandarin Chinese using this new feature, which is only available in the Synthesizer V Studio Pro Editor.[27]
    • This does not apply to the Lite version, thus restricting the voice database to Japanese only.

System requirements as noted:

Hardware Requirements:

  • CPU:
    • Intel Core series 4th generation i5 (i5-4xxx) or higher
    • AMD Athlon X4 845, Ryzen series or higher
  • RAM: 2GB or higher
  • Disk Space: 1 GB or higher (for installing one voice database)
    • The amount of space required depends on the number of voice databases installed.
  • Display: 1280 x 800 or higher

Software Requirements:

  • Operating System:
    • Windows 10/8.1
    • Mac OS X: 10.11 or higher
    • Linux Ubuntu 16.4 or higher

Other:

  • DVD-ROM Drive (physical edition only)
  • Sound card
  • Internet connection is necessary for activation and obtaining updaters.

License agreements as noted:
  • TOKYO6 ENTERTAINMENT's Character Usage Guidelines - Japanese
  • AH-Software's End User License Agreement - Japanese
  • AH-Software's End User License Agreement - English
  • Regarding the Lite version:
    • AH-Software does not accept technical inquiries regarding free software nor do they guarantee or support the operation of all free software.
    • AH-Software is not liable for any damages (including loss of data) caused by using free software. Users are cautioned to use the free software at their own risk.
    • The program may not be transferred, sold, rented, distributed or rented without AH-Software's permission, regardless of whether it is paid or free of charge.
    • Reverse engineering, including modification, decompilation, and disassembly, of their program for any purpose is prohibited.
    • Koharu Rikka AI Lite may not be used commercially in any way
    • When using the Lite version of this voice database, "This work uses the Lite version" must be mentioned on any uploads.

Voice database sample

References[]

  1. https://twitter.com/tokyo6info/status/1266374943165431809
  2. https://twitter.com/tokyo6info/status/1269628898637053956
  3. https://twitter.com/tokyo6info/status/1276370101172760576
  4. https://twitter.com/s_akasakov/status/1292095217659568129
  5. https://twitter.com/ahsoft/status/1322055701938622464
  6. https://www.ah-soft.com/press/synth-v/20201030.html
  7. https://note.com/tokyo6/n/nfd646a7bf86d
  8. https://youtu.be/n5vIp4TlCY0
  9. https://twitter.com/ahsoft/status/1362573316913991681
  10. https://twitter.com/ahsoft/status/1362387362785845249
  11. https://www.ah-soft.com/trial/synth-v.html
  12. https://twitter.com/ahsoft/status/1372383251231215617
  13. https://www.ah-soft.com/press/cevio/20220324.html
  14. https://twitter.com/tokyo6info/status/1507669520500273153
  15. https://www.youtube.com/watch?v=vvpaI_qIbS4
  16. https://twitter.com/uchuuzentai/status/1527603426103894016 TOKYO6's announcement about Rikka's update as translated by xuu.
  17. https://twitter.com/dreamtonics_en/status/1550050403613835264
  18. https://twitter.com/rikka_info/status/1550061847948054528
  19. https://twitter.com/dreamtonics_en/status/1374918965328105473
  20. https://twitter.com/dreamtonics_en/status/1405722114452201472
  21. https://twitter.com/ahsoft/status/1405724392936509440
  22. https://twitter.com/ahsoft/status/1471405609740546049
  23. https://dreamtonics.com/en/cross-lingual-support-for-synthesizer-v-ai/
  24. https://www.ah-soft.com/synth-v/rikka/
  25. https://dreamtonics.com/en/synthesizerv/
  26. https://ubgoe.com/projects/200
  27. https://twitter.com/dreamtonics_en/status/1473941453810577410

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