--- title: "Changes to 音声合成する" method: POST path: "/synthesis" --- # Changes to 音声合成する `POST /synthesis` > Every recorded change to this operation, newest first. ## Timeline Changed in 18 of 39 revisions. - **2026-10-19** `9adfe4501140`: 12 warning - **2026-09-27** `bea1c63c3d6f`: 2 info - **2025-03-02** `d8b6a60f88af`: 1 info - **2025-01-03** `b7afc41080b3`: 5 breaking, 1 warning, 2 info - **2024-10-05** `e86c0159e1bd`: 1 info - **2024-06-28** `3b94f9a50fd2`: 2 info - **2024-01-28** `2e8475c446af`: 1 breaking, 1 warning, 1 info - **2024-01-22** `ba5021ec9a6d`: 3 info - **2024-01-20** `2a8c9cc0823a`: 1 breaking, 1 warning, 1 info - **2024-01-17** `98b1b5ed5d83`: 1 breaking, 1 warning, 3 info - **2023-10-07** `a93282ebb9a2`: 1 info - **2022-02-26** `6ceee601dc21`: 1 info - **2022-02-04** `4f999bbd6947`: 2 info - **2021-09-21** `abf6494c5052`: 1 info - **2021-09-08** `280b8cbca6ec`: 3 breaking, 2 info - **2021-08-23** `a57803c60280`: 4 breaking - **2021-08-13** `d326feb3237d`: 2 breaking, 4 warning, 1 info - **2021-08-01** `54e3a135bccf`: 15 warning, 3 info ## Changes - **2026-10-19** `9adfe4501140`: 12 warning - the `outputSamplingRate` request property's exclusiveMinimum was set to `0.00` - the `speedScale` request property's exclusiveMinimum was set to `0.00` - the `accent_phrases/items/accent` request property's min was set to `1.00` - the `accent_phrases/items/moras/items/consonant_length` request property's min was set to `0.00` - the `accent_phrases/items/moras/items/vowel_length` request property's min was set to `0.00` - the `accent_phrases/items/pause_mora/consonant_length` request property's min was set to `0.00` - the `accent_phrases/items/pause_mora/vowel_length` request property's min was set to `0.00` - the `pauseLength/anyOf[subschema #1]/` request property's min was set to `0.00` - the `pauseLengthScale` request property's min was set to `0.00` - the `postPhonemeLength` request property's min was set to `0.00` - the `prePhonemeLength` request property's min was set to `0.00` - the `volumeScale` request property's min was set to `0.00` - **2026-09-27** `bea1c63c3d6f`: 2 info - added the optional property `detail/items/ctx` to the response with the `422` status - added the optional property `detail/items/input` to the response with the `422` status - **2025-03-02** `d8b6a60f88af`: 1 info - api operation id `synthesis_synthesis_post` removed and replaced with `synthesis` - **2025-01-03** `b7afc41080b3`: 5 breaking, 1 warning, 2 info - added the new required request property `accent_phrases/items/pause_mora/pitch` - added the new required request property `accent_phrases/items/pause_mora/text` - added the new required request property `accent_phrases/items/pause_mora/vowel` - added the new required request property `accent_phrases/items/pause_mora/vowel_length` - the `accent_phrases/items/pause_mora` request property type changed from no type to `object` - removed `#/components/schemas/Mora` from the `accent_phrases/items/pause_mora` request property `allOf` list - added the new optional request property `accent_phrases/items/pause_mora/consonant` - added the new optional request property `accent_phrases/items/pause_mora/consonant_length` - **2024-10-05** `e86c0159e1bd`: 1 info - request property `pauseLength` list-of-types was widened by adding types `null` to media type `application/json` - **2024-06-28** `3b94f9a50fd2`: 2 info - added the new optional request property `pauseLength` - added the new optional request property `pauseLengthScale` - **2024-01-28** `2e8475c446af`: 1 breaking, 1 warning, 1 info - the `query` request parameter `speaker` became required - deleted the `query` request parameter `style_id` - `query` request parameter `speaker` was reactivated - **2024-01-22** `ba5021ec9a6d`: 3 info - added the new optional `query` request parameter `style_id` - the `query` request parameter `speaker` became optional - `query` request parameter `speaker` was deprecated - **2024-01-20** `2a8c9cc0823a`: 1 breaking, 1 warning, 1 info - the `query` request parameter `speaker` became required - deleted the `query` request parameter `style_id` - `query` request parameter `speaker` was reactivated - **2024-01-17** `98b1b5ed5d83`: 1 breaking, 1 warning, 3 info - response property `detail/items/loc/items/` list-of-types was widened by adding types `integer` to media type `application/json` of response `422` - removed the request property `periodic_pitch` - added the new optional `query` request parameter `style_id` - the `query` request parameter `speaker` became optional - `query` request parameter `speaker` was deprecated - **2023-10-07** `a93282ebb9a2`: 1 info - added the new optional request property `periodic_pitch` - **2022-02-26** `6ceee601dc21`: 1 info - added the new optional `query` request parameter `core_version` - **2022-02-04** `4f999bbd6947`: 2 info - added the new optional `query` request parameter `enable_interrogative_upspeak` - added the new optional request property `accent_phrases/items/is_interrogative` - **2021-09-21** `abf6494c5052`: 1 info - added the new optional request property `kana` - **2021-09-08** `280b8cbca6ec`: 3 breaking, 2 info - added the new required request property `accent_phrases/items/moras/items/vowel_length` - added the new required request property `accent_phrases/items/pause_mora/allOf[subschema #1: Mora]/vowel_length` - added the new required request property `outputStereo` - added the new optional request property `accent_phrases/items/moras/items/consonant_length` - added the new optional request property `accent_phrases/items/pause_mora/allOf[subschema #1: Mora]/consonant_length` - **2021-08-23** `a57803c60280`: 4 breaking - added the new required request property `outputSamplingRate` - added the new required request property `postPhonemeLength` - added the new required request property `prePhonemeLength` - added the new required request property `volumeScale` - **2021-08-13** `d326feb3237d`: 2 breaking, 4 warning, 1 info - added `#/components/schemas/Mora` to the `accent_phrases/items/pause_mora` request property `allOf` list - the `accent_phrases/items/pause_mora` request property type changed from `object` to no type - removed the request property `accent_phrases/items/pause_mora/consonant` - removed the request property `accent_phrases/items/pause_mora/pitch` - removed the request property `accent_phrases/items/pause_mora/text` - removed the request property `accent_phrases/items/pause_mora/vowel` - api tag `音声合成` added - **2021-08-01** `54e3a135bccf`: 15 warning, 3 info - deleted the `query` request parameter `core_version` - deleted the `query` request parameter `enable_interrogative_upspeak` - removed the request property `accent_phrases/items/is_interrogative` - removed the request property `accent_phrases/items/moras/items/consonant_length` - removed the request property `accent_phrases/items/moras/items/vowel_length` - removed the request property `accent_phrases/items/pause_mora/consonant_length` - removed the request property `accent_phrases/items/pause_mora/vowel_length` - removed the request property `kana` - removed the request property `outputSamplingRate` - removed the request property `outputStereo` - removed the request property `pauseLength` - removed the request property `pauseLengthScale` - removed the request property `postPhonemeLength` - removed the request property `prePhonemeLength` - removed the request property `volumeScale` - api operation id `synthesis` removed and replaced with `synthesis_synthesis_post` - api tag `音声合成` removed - response property `detail/items/loc/items/` list-of-types was narrowed by removing types `integer` from media type `application/json` of response `422` --- [Operation](https://skmtc.dev/voicevox/apis/voicevox-engine-oss/docs/synthesis/post.md) - [API](https://skmtc.dev/voicevox/apis/voicevox-engine-oss.md) - [Page](https://skmtc.dev/voicevox/apis/voicevox-engine-oss/changes/synthesis/post)