自動偵測語言

本頁說明如何設定辨識器,從預設的可能語言清單中,自動辨識音訊檔案中使用的語言。

有時您可能不確定錄音內容包含何種語言。舉例來說,如果您是在擁有多種官方語言的國家/地區發佈服務、應用程式或產品,收到的音訊內容可能來自各種不同語言的使用者。如此一來,如果要替語音轉錄要求指定單一語言代碼,難度可能就更高了。

多語言辨識

Cloud Speech-to-Text 可讓您指定音訊資料可能包含的一組語言。建立 Recognizer 或傳送辨識要求時,您可以在 language_codes 欄位中,提供音訊資料可能包含的一或多種語言。如果要求中包含多種語言,Cloud Speech-to-Text 會嘗試使用您提供的替代語言清單中,最適合的語言轉錄音訊。接著,Cloud Speech-to-Text 會為轉錄結果加上預測語言代碼標籤。

此功能適用於需要對語音指令或搜尋指令等簡短陳述式,執行語音轉錄的應用程式。你最多可以列出三種語言,供系統自動辨識。

事前準備

  1. 登入 Google Cloud 帳戶。如果您是 Google Cloud新手,歡迎 建立帳戶,親自評估產品在實際工作環境中的成效。新客戶還能獲得價值 $300 美元的免費抵免額,可用於執行、測試及部署工作負載。
  2. In the Google Cloud console, on the project selector page, select or create a Google Cloud project.

    Roles required to select or create a project

    • Select a project: Selecting a project doesn't require a specific IAM role—you can select any project that you've been granted a role on.
    • Create a project: To create a project, you need the Project Creator role (roles/resourcemanager.projectCreator), which contains the resourcemanager.projects.create permission. Learn how to grant roles.

    Go to project selector

  3. Verify that billing is enabled for your Google Cloud project.

  4. Enable the Speech-to-Text APIs.

    Roles required to enable APIs

    To enable APIs, you need the Service Usage Admin IAM role (roles/serviceusage.serviceUsageAdmin), which contains the serviceusage.services.enable permission. Learn how to grant roles.

    Enable the APIs

  5. Make sure that you have the following role or roles on the project: Cloud Speech Administrator

    Check for the roles

    1. In the Google Cloud console, go to the IAM page.

      Go to IAM
    2. Select the project.
    3. In the Principal column, find all rows that identify you or a group that you're included in. To learn which groups you're included in, contact your administrator.

    4. For all rows that specify or include you, check the Role column to see whether the list of roles includes the required roles.

    Grant the roles

    1. In the Google Cloud console, go to the IAM page.

      Go to IAM
    2. Select the project.
    3. Click Grant access.
    4. In the New principals field, enter your user identifier. This is typically the email address for a Google Account.

    5. Click Select a role, then search for the role.
    6. To grant additional roles, click Add another role and add each additional role.
    7. Click Save.
  6. 安裝 Google Cloud CLI。

  7. 若您採用的是外部識別資訊提供者 (IdP),請先使用聯合身分登入 gcloud CLI

  8. 執行下列指令,初始化 gcloud CLI:

    gcloud init
  9. In the Google Cloud console, on the project selector page, select or create a Google Cloud project.

    Roles required to select or create a project

    • Select a project: Selecting a project doesn't require a specific IAM role—you can select any project that you've been granted a role on.
    • Create a project: To create a project, you need the Project Creator role (roles/resourcemanager.projectCreator), which contains the resourcemanager.projects.create permission. Learn how to grant roles.

    Go to project selector

  10. Verify that billing is enabled for your Google Cloud project.

  11. Enable the Speech-to-Text APIs.

    Roles required to enable APIs

    To enable APIs, you need the Service Usage Admin IAM role (roles/serviceusage.serviceUsageAdmin), which contains the serviceusage.services.enable permission. Learn how to grant roles.

    Enable the APIs

  12. Make sure that you have the following role or roles on the project: Cloud Speech Administrator

    Check for the roles

    1. In the Google Cloud console, go to the IAM page.

      Go to IAM
    2. Select the project.
    3. In the Principal column, find all rows that identify you or a group that you're included in. To learn which groups you're included in, contact your administrator.

    4. For all rows that specify or include you, check the Role column to see whether the list of roles includes the required roles.

    Grant the roles

    1. In the Google Cloud console, go to the IAM page.

      Go to IAM
    2. Select the project.
    3. Click Grant access.
    4. In the New principals field, enter your user identifier. This is typically the email address for a Google Account.

    5. Click Select a role, then search for the role.
    6. To grant additional roles, click Add another role and add each additional role.
    7. Click Save.
  13. 安裝 Google Cloud CLI。

  14. 若您採用的是外部識別資訊提供者 (IdP),請先使用聯合身分登入 gcloud CLI

  15. 執行下列指令,初始化 gcloud CLI:

    gcloud init
  16. 用戶端程式庫可以使用應用程式預設憑證,輕鬆向 Google API 進行驗證,然後傳送要求給這些 API。有了應用程式預設憑證,您就能在本機測試應用程式並部署,不必變更基礎程式碼。詳情請參閱「 進行驗證以使用用戶端程式庫」一文。

  17. 如果您使用本機殼層,請為使用者帳戶建立本機驗證憑證:

    gcloud auth application-default login

    如果您使用 Cloud Shell,則不需要執行這項操作。

    如果系統傳回驗證錯誤,且您使用外部識別資訊提供者 (IdP),請確認您已 使用聯合身分登入 gcloud CLI

此外,請務必安裝用戶端程式庫

在音訊語音轉錄要求中啟用語言辨識

以下是對本機音訊檔案執行同步語音辨識的範例,支援多種語言。

Python

import os

from typing import List

from google.cloud.speech_v2 import SpeechClient
from google.cloud.speech_v2.types import cloud_speech

PROJECT_ID = os.getenv("GOOGLE_CLOUD_PROJECT")


def transcribe_multiple_languages_v2(
    audio_file: str,
    language_codes: List[str],
) -> cloud_speech.RecognizeResponse:
    """Transcribe an audio file using Google Cloud Speech-to-Text API with support for multiple languages.
    Args:
        audio_file (str): Path to the local audio file to be transcribed.
            Example: "resources/audio.wav"
        language_codes (List[str]): A list of BCP-47 language codes to be used for transcription.
            Example: ["en-US", "fr-FR"]
    Returns:
        cloud_speech.RecognizeResponse: The response from the Speech-to-Text API containing the
            transcription results.
    """
    client = SpeechClient()

    # Reads a file as bytes
    with open(audio_file, "rb") as f:
        audio_content = f.read()

    config = cloud_speech.RecognitionConfig(
        auto_decoding_config=cloud_speech.AutoDetectDecodingConfig(),
        language_codes=language_codes,
        model="latest_long",
    )

    request = cloud_speech.RecognizeRequest(
        recognizer=f"projects/{PROJECT_ID}/locations/global/recognizers/_",
        config=config,
        content=audio_content,
    )

    # Transcribes the audio into text
    response = client.recognize(request=request)
    # Prints the transcription results
    for result in response.results:
        print(f"Transcript: {result.alternatives[0].transcript}")

    return response

清除所用資源

為避免系統向您的 Google Cloud 帳戶收取本頁面所用資源的費用,請按照下列步驟操作。

  1. 選用:撤銷您建立的驗證憑證,並刪除本機憑證檔案。

    gcloud auth application-default revoke
  2. 選用:從 gcloud CLI 撤銷憑證。

    gcloud auth revoke

控制台

  • 前往 Google Cloud 控制台的「Manage resources」(管理資源) 頁面。

    前往「Manage resources」(管理資源)

  • 在專案清單中選取要刪除的專案,然後點選「Delete」(刪除)
  • 在對話方塊中輸入專案 ID,然後按一下 [Shut down] (關閉) 以刪除專案。
  • gcloud

    刪除 Google Cloud 專案:

    gcloud projects delete PROJECT_ID

    後續步驟