轉錄短音訊檔案

這個頁面說明如何使用同步語音辨識功能，將短音訊檔案轉錄為文字內容。

同步語音辨識會針對短音訊 (少於 60 秒) 傳回辨識出的文字。

您可以從本機檔案將音訊內容直接傳送至 Cloud Speech-to-Text，Cloud Speech-to-Text 也可以處理儲存在 Cloud Storage 值區中的音訊內容。如要瞭解同步語音辨識要求的限制，請參閱配額與限制頁面。

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。

  16. 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。

對本機檔案執行同步語音辨識

以下是對本機音訊檔案執行同步語音辨識的範例：

Python


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

# TODO(developer): Update and un-comment below line
# PROJECT_ID = "your-project-id"

# Instantiates a client
client = SpeechClient()

# Reads a file as bytes
with open("resources/audio.wav", "rb") as f:
    audio_content = f.read()

config = cloud_speech.RecognitionConfig(
    auto_decoding_config=cloud_speech.AutoDetectDecodingConfig(),
    language_codes=["en-US"],
    model="chirp_3",
)

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)

for result in response.results:
    print(f"Transcript: {result.alternatives[0].transcript}")

對遠端檔案執行同步語音辨識

為方便起見，Speech-to-Text API 可以對位於 Cloud Storage 中的音訊檔案直接執行同步語音辨識，您無需在要求內容中傳送音訊檔案的內容。

Speech-to-Text 會使用服務帳戶存取 Cloud Storage 中的檔案。依預設，服務帳戶可存取同一個專案中的 Cloud Storage 檔案。

服務帳戶電子郵件地址如下：

service-PROJECT_NUMBER@gcp-sa-speech.iam.gserviceaccount.com

如要轉錄其他專案中的 Cloud Storage 檔案，請在其他專案中將 [Speech-to-Text 服務代理程式][speech-service-agent] 角色授予這個服務帳戶：

gcloud projects add-iam-policy-binding PROJECT_ID \
    --member=serviceAccount:service-PROJECT_NUMBER@gcp-sa-speech.iam.gserviceaccount.com \
    --role=roles/speech.serviceAgent

如要進一步瞭解專案 IAM 政策，請參閱 [管理專案、資料夾和機構的存取權][manage-access]。

您也可以授予服務帳戶特定 Cloud Storage bucket 的權限，提供更精細的存取權：

gcloud storage buckets add-iam-policy-binding gs://BUCKET_NAME \
    --member=serviceAccount:service-PROJECT_NUMBER@gcp-sa-speech.iam.gserviceaccount.com \
    --role=roles/storage.admin

如要進一步瞭解如何管理 Cloud Storage 存取權，請參閱 Cloud Storage 說明文件中的 [建立及管理存取權控管清單][buckets-manage-acl]。

以下是對位於 Cloud Storage 中的檔案執行同步語音辨識的範例：

Python

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

# Instantiates a client
client = SpeechClient()

# TODO(developer): Update and un-comment below line
# PROJECT_ID = "your-project-id"

config = cloud_speech.RecognitionConfig(
    auto_decoding_config=cloud_speech.AutoDetectDecodingConfig(),
    language_codes=["en-US"],
    model="chirp_3",
)

request = cloud_speech.RecognizeRequest(
    recognizer=f"projects/{PROJECT_ID}/locations/global/recognizers/_",
    config=config,
    uri="gs://cloud-samples-data/speech/audio.flac",  # URI of the audio file in Google Cloud Storage
)

# Transcribes the audio into text
response = client.recognize(request=request)

for result in response.results:
    print(f"Transcript: {result.alternatives[0].transcript}")

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