语音设计

借助语音设计，您可以使用 Gemini API Voices 端点 (POST /v1beta/voices) 通过自然语言描述来创建全新的持久性声音角色。您无需局限于预建的语音或录制参考音频，只需描述角色的年龄、音色、口音和基准发音，即可获得保存到项目中的可重复使用的 voice_... ID。

在 Google AI Studio 中使用交互式语音设计工作室，可以快速设计、试听和迭代自定义语音。您可以根据文本提示生成自定义角色，使用示例脚本对其进行测试，然后将生成的 voice_... ID 直接复制到应用代码中。

在 Google AI Studio 中试用

Gemini 3.8 Flash TTS (gemini-3.8-flash-tts) 和 Gemini 3.8 Flash-Lite TTS (gemini-3.8-flash-lite-tts) 均支持语音设计。

创建设计的语音

使用 Google GenAI SDK（google-genai 2.25.0+ / @google/genai 2.24.0+）或 REST API，根据文本说明创建自定义语音。对于 "prompted" 语音，voices.create (CreateVoice) 和 voices.get (GetVoice) 都会返回仅输出的 sample_audio 字段（mime_type: "audio/wav"，以 base64 编码的 data），以便您可以立即试听生成的语音：

Python

import base64
from google import genai

client = genai.Client()

# 1. Design a custom voice persona from natural language
created_voice = client.voices.create(
    store=True,
    voice={
        "model": "gemini-3.8-flash-tts",
        "type": "prompted",
        "display_name": "Warm British Astronomer",
        "gender": "male",
        "language_code": "en-GB",
        "prompted": {
            "input": (
                "A warm, thoughtful astronomer in his late 60s with a gentle"
                " British accent, speaking with quiet wonder."
            )
        },
    },
)

print(f"Created voice ID: {created_voice.id}")

# Save the generated sample_audio preview (audio/wav) returned by CreateVoice
if created_voice.sample_audio and created_voice.sample_audio.data:
    with open("voice_preview.wav", "wb") as f:
        f.write(base64.b64decode(created_voice.sample_audio.data))

JavaScript

import * as fs from "node:fs";
import { GoogleGenAI } from "@google/genai";

const ai = new GoogleGenAI();

// 1. Design a custom voice persona from natural language
const createdVoice = await ai.voices.create({
  store: true,
  voice: {
    model: "gemini-3.8-flash-tts",
    type: "prompted",
    display_name: "Warm British Astronomer",
    gender: "male",
    language_code: "en-GB",
    prompted: {
      input:
        "A warm, thoughtful astronomer in his late 60s with a gentle British accent, speaking with quiet wonder.",
    },
  },
});

console.log(`Created voice ID: ${createdVoice.id}`);

// Save the generated sample_audio preview (audio/wav) returned by CreateVoice
if (createdVoice.sample_audio?.data) {
  fs.writeFileSync(
    "voice_preview.wav",
    Buffer.from(createdVoice.sample_audio.data, "base64")
  );
}

REST

curl "https://generativelanguage.googleapis.com/v1beta/voices" \
  -H "x-goog-api-key: $GEMINI_API_KEY" \
  -H "Content-Type: application/json" \
  -X POST \
  -d '{
    "store": true,
    "voice": {
      "model": "gemini-3.8-flash-tts",
      "type": "prompted",
      "display_name": "Warm British Astronomer",
      "gender": "male",
      "language_code": "en-GB",
      "prompted": {
        "input": "A warm, thoughtful astronomer in his late 60s with a gentle British accent, speaking with quiet wonder."
      }
    }
  }' | tee created_voice.json | jq -r '.sample_audio.data' | base64 --decode > voice_preview.wav

语音设计的工作原理

创建提示语音：使用 type="prompted" 和 store=True 调用 voices.create (POST /v1beta/voices)。
接收持久性 voice_id 和 sample_audio 预览：API 会生成声音身份，将其存储在您的项目中，并返回永久性 ID（例如 voice_abc123...）以及 sample_audio（mime_type: "audio/wav"，base64 编码的 data），其中包含为该声音生成的预览音频。
合成语音：在合成请求中，将 voice_id 传递到接受语音名称的任何位置。

使用您设计的语音合成语音

创建语音后，将该语音的 id (voice_...) 传递给 Interactions API 以生成语音：

Python

import base64
from google import genai

client = genai.Client()

interaction = client.interactions.create(
    model="gemini-3.8-flash-tts",
    input=[{
        "type": "user_input",
        "content": [{
            "type": "text",
            "text": (
                "Look out past the rings of Saturn. Those faint photons left"
                " their source millions of years ago."
            ),
            "annotations": [{
                "type": "speech_metadata",
                "style": "reflective and awe-inspired",
            }],
        }],
    }],
    response_format={"type": "audio"},
    generation_config={
        "speech_config": [
            {"voice": created_voice.id},
        ]
    },
)

with open("designed_voice.wav", "wb") as f:
    f.write(base64.b64decode(interaction.output_audio.data))

JavaScript

import * as fs from "node:fs";
import { GoogleGenAI } from "@google/genai";

const ai = new GoogleGenAI();

const interaction = await ai.interactions.create({
  model: "gemini-3.8-flash-tts",
  input: [{
    type: "user_input",
    content: [{
      type: "text",
      text: "Look out past the rings of Saturn. Those faint photons left their source millions of years ago.",
      annotations: [{
        type: "speech_metadata",
        style: "reflective and awe-inspired",
      }],
    }],
  }],
  response_format: { type: "audio" },
  generation_config: {
    speech_config: [
      { voice: createdVoice.id },
    ],
  },
});

fs.writeFileSync("designed_voice.wav", Buffer.from(interaction.output_audio.data, "base64"));

REST

curl "https://generativelanguage.googleapis.com/v1beta/interactions" \
  -H "x-goog-api-key: $GEMINI_API_KEY" \
  -H "Content-Type: application/json" \
  -X POST \
  -d '{
    "model": "gemini-3.8-flash-tts",
    "input": [{
      "type": "user_input",
      "content": [{
        "type": "text",
        "text": "Look out past the rings of Saturn. Those faint photons left their source millions of years ago.",
        "annotations": [{
          "type": "speech_metadata",
          "style": "reflective and awe-inspired"
        }]
      }]
    }],
    "response_format": {"type": "audio"},
    "generation_config": {
      "speech_config": [
        {"voice": "voice_YOUR_DESIGNED_VOICE_ID"}
      ]
    }
  }'

管理声音

您可以随时使用 Voices API 列出、过滤、检查和删除已存储的声音（有关所有过滤参数，请参阅扩展语音库和过滤）。

存储空间限制和 TTL：有状态的声音（store=True，在提示的声音和复制的声音之间共享）的限制为每个项目 200 个声音，并且存留时间 (TTL) 为 1 年。
sample_audio 可用性： voices.create() (CreateVoice) 和 voices.get() (GetVoice) 会为 "prompted" 语音填充 sample_audio（mime_type: "audio/wav"，base64 编码的 data）。为了保持列表的轻量级，voices.list() (ListVoices) 会省略 sample_audio（对于 "replicated" 和 "prebuilt" 语音，sample_audio 未设置）。

Python

from google import genai

client = genai.Client()

# List stored prompted voices in your project filtered by language
response = client.voices.list(
    type_=["prompted"],
    language_code=["en-US", "en-GB"],
)
for voice in response.voices or []:
    print(voice.id, voice.display_name, voice.type)

# Retrieve a specific voice by ID
voice_details = client.voices.get(id=created_voice.id)

# Delete a stored custom voice
client.voices.delete(id=created_voice.id)

JavaScript

import { GoogleGenAI } from "@google/genai";

const ai = new GoogleGenAI();

// List stored prompted voices in your project filtered by language
const response = await ai.voices.list({
  type: ["prompted"],
  language_code: ["en-US", "en-GB"],
});
for (const voice of response.voices ?? []) {
  console.log(voice.id, voice.display_name, voice.type);
}

// Retrieve a specific voice by ID
const voiceDetails = await ai.voices.get(createdVoice.id);

// Delete a stored custom voice
await ai.voices.delete(createdVoice.id);

REST

# List stored prompted voices filtered by language
curl -G "https://generativelanguage.googleapis.com/v1beta/voices" \
  -H "x-goog-api-key: $GEMINI_API_KEY" \
  --data-urlencode "type=prompted" \
  --data-urlencode "language_code=en-US" \
  --data-urlencode "language_code=en-GB"

# Retrieve a specific voice by ID
curl "https://generativelanguage.googleapis.com/v1beta/voices/voice_YOUR_DESIGNED_VOICE_ID" \
  -H "x-goog-api-key: $GEMINI_API_KEY"

# Delete a stored custom voice
curl -X DELETE "https://generativelanguage.googleapis.com/v1beta/voices/voice_YOUR_DESIGNED_VOICE_ID" \
  -H "x-goog-api-key: $GEMINI_API_KEY"

语音设计的提示最佳实践

将永久性声音特征放在 Voice 设计中，而不是 style 中：在 voices.create 中创建声音时，定义不可变的特征，例如年龄、性别、音色、声音质感和地区口音。
预留 speech_metadata.style 用于表达情境情绪：创建自定义声音后，使用简短的 style 提示（例如 "whispered urgently" 或 "cheerful and energetic"）来引导逐轮表演，而不会改变说话者的核心身份。
内容要具体且简洁：清晰的 1-2 句话描述（例如“一位 30 多岁的体育播报员，声音清脆有力，略带中西部口音”）比矛盾或过长的段落能生成更清晰、更一致的结果。

后续步骤

了解如何在语音复刻中复刻现有说话者的声音。
如需了解回合级样式、内嵌标记和多发言人对话，请参阅文字转语音指南。