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Microsoft Speech Recognition (Microsoft.Speech)

1. Overview

Microsoft Server Speech Platform Runtime is a runtime environment that supports speech recognition and synthesis.
In VoiceScriptPlayer, it enables Speech-to-Text (STT) functionality.

⚠️ Unlike the built-in Windows SAPI (System.Speech),
you must install both the runtime and language packs separately for it to work properly.

2. Installation & Setup

1) Required Downloads

You must install the following two components:

  • Microsoft Server Speech Platform Runtime (x64)
    Download Link

  • Microsoft Server Speech Recognition Language Packs (Language Pack Collection)
    Download Link
    Language Pack Setup

The first file is the runtime engine, and the second contains language packs (multi-language support).
Language pack files usually end with TELE in their filename.

2) Language Pack Notes

  • You must install the language pack that matches your Windows language setting or your project’s target language.
  • Common language codes:
  • en-US → English (United States)
  • ko-KR → Korean
  • ja-JP → Japanese
  • zh-CN → Chinese (Simplified)
  • If the correct language pack is not installed, the recognizer may fail to start or produce errors.

3) How to Verify Installation

To confirm successful installation:

  1. Open Control Panel → Programs and Features.
  2. If the following two entries are listed, installation was successful:
  3. Microsoft Server Speech Platform Runtime (x64)
  4. Microsoft Server Speech Recognition Language - <Installed Language>

Example (Korean Language Pack Installed):
Installation Confirmation

3. Using with VoiceScriptPlayer

  • Once installed, VoiceScriptPlayer automatically detects the runtime and language packs.
  • No manual launch is required — the program checks for the installed language packs and starts the recognizer accordingly.

4. Troubleshooting

1) Runtime Installation Error

Runtime Error

  • Cause: The runtime is not installed or there is a 32/64-bit mismatch.
  • Solution:
  • Ensure Microsoft Server Speech Platform Runtime (x64) is installed.

2) Language Pack Missing

Language Pack Error

  • Cause: The required language pack is not installed.
  • Solution:
  • Download and install the appropriate language pack from the Language Pack Page.
  • Make sure the language code (e.g., ko-KR, en-US, ja-JP) matches your project settings.

5. Notes

  • Only the x64 runtime is supported (x86 is not compatible).
  • Each language requires its own separate language pack installation.
  • The Microsoft Speech Platform is no longer actively updated, so newer features are not available.

6. License & Sources