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

語音轉文字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。如果要求包含多種語言，Speech-to-Text 會嘗試使用您提供的替代語言清單中，最合適的語言轉錄音訊。接著，Speech-to-Text 會為轉錄結果加上預測的語言代碼標籤。

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

Sign in to your Google Cloud account. If you're new to Google Cloud, create an account to evaluate how our products perform in real-world scenarios. New customers also get $300 in free credits to run, test, and deploy workloads.

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

Go to project selector

Make sure that billing is enabled for your Google Cloud project.

Enable the Speech-to-Text APIs.

Enable the APIs

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.

   前往「IAM」頁面
2. 選取專案。
3. 按一下「授予存取權」person_add。

4. 在「New principals」(新增主體) 欄位中，輸入您的使用者 ID。 這通常是 Google 帳戶的電子郵件地址。

5. 在「Select a role」(選取角色) 清單中，選取角色。
6. 如要授予其他角色，請按一下 add「新增其他角色」，然後新增每個其他角色。
7. 按一下 [Save]。

Install the Google Cloud CLI.

If you're using an external identity provider (IdP), you must first sign in to the gcloud CLI with your federated identity.

To initialize the gcloud CLI, run the following command:

gcloud init

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

Go to project selector

Make sure that billing is enabled for your Google Cloud project.

Enable the Speech-to-Text APIs.

Enable the APIs

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.

   前往「IAM」頁面
2. 選取專案。
3. 按一下「授予存取權」person_add。

4. 在「New principals」(新增主體) 欄位中，輸入您的使用者 ID。 這通常是 Google 帳戶的電子郵件地址。

5. 在「Select a role」(選取角色) 清單中，選取角色。
6. 如要授予其他角色，請按一下 add「新增其他角色」，然後新增每個其他角色。
7. 按一下 [Save]。

Install the Google Cloud CLI.

If you're using an external identity provider (IdP), you must first sign in to the gcloud CLI with your federated identity.

To initialize the gcloud CLI, run the following command:

gcloud init

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。使用應用程式預設憑證，您可以在本機測試及部署應用程式，不必變更基礎程式碼。詳情請參閱「 驗證以使用用戶端程式庫」。

1. If you're using a local shell, then create local authentication credentials for your user account:

   gcloud auth application-default login

   You don't need to do this if you're using Cloud Shell.

   If an authentication error is returned, and you are using an external identity provider (IdP), confirm that you have signed in to the gcloud CLI with your federated identity.

此外，請確認您已安裝用戶端程式庫。

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

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

1. Optional: Revoke the authentication credentials that you created, and delete the local credential file.

   gcloud auth application-default revoke

2. Optional: Revoke credentials from the gcloud CLI.

   gcloud auth revoke

控制台

In the Google Cloud console, go to the Manage resources page.

Go to Manage resources

In the project list, select the project that you want to delete, and then click Delete.

In the dialog, type the project ID, and then click Shut down to delete the project.

gcloud

Delete a Google Cloud project:

gcloud projects delete PROJECT_ID

後續步驟

• 練習轉錄短音訊檔案。
• 瞭解如何轉錄串流音訊。
• 瞭解如何轉錄長音訊檔案。
• 如要獲得最佳效能、準確率與其他提示，請參閱最佳做法說明文件。