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In this article, you learn how to evaluate pronunciation with speech to text through the Speech SDK. To [get pronunciation assessment results](#get-pronunciation-assessment-results), you apply the `PronunciationAssessmentConfig` settings to a `SpeechRecognizer` object.
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> [!NOTE]
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> For information about availability of pronunciation assessment, see [supported languages](language-support.md?tabs=pronunciation-assessment) and [available regions](regions.md#speech-service).
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>
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> As a baseline, usage of pronunciation assessment costs the same as speech to text for pay-as-you-go or commitment tier [pricing](https://azure.microsoft.com/pricing/details/cognitive-services/speech-services). If you [purchase a commitment tier](../commitment-tier.md) for speech to text, the spend for pronunciation assessment goes towards meeting the commitment.
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>
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> For pricing differences between scripted and unscripted assessment, see [the pricing note](./pronunciation-assessment-tool.md#pricing).
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- Syllable groups
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- Phonemes in [SAPI](/previous-versions/windows/desktop/ee431828(v=vs.85)#american-english-phoneme-table) or [IPA](https://en.wikipedia.org/wiki/IPA) format
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> [!NOTE]
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> The syllable group, phoneme name, and spoken phoneme of pronunciation assessment are currently only available for the en-US locale. For information about availability of pronunciation assessment, see [supported languages](language-support.md?tabs=pronunciation-assessment) and [available regions](regions.md#speech-service).
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## Syllable groups
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Pronunciation assessment can provide syllable-level assessment results. Grouping in syllables is more legible and aligned with speaking habits, as a word is typically pronounced syllable by syllable rather than phoneme by phoneme.
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Pronunciation assessment supports syllable groups in `en-US` with IPA and in both `en-US` and `en-GB` with SAPI.
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The following table compares example phonemes with the corresponding syllables.
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| Sample word | Phonemes | Syllables |
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## Phoneme alphabet format
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For the `en-US` locale, the phoneme name is provided together with the score, to help identify which phonemes were pronounced accurately or inaccurately. For other locales, you can only get the phoneme score.
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Pronunciation assessment supports phoneme name in `en-US` with IPA and in `en-US`, `en-GB` and `zh-CN` with SAPI.
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For locales that support phoneme name, the phoneme name is provided together with the score, to help identify which phonemes were pronounced accurately or inaccurately. For other locales, you can only get the phoneme score.
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The following table compares example SAPI phonemes with the corresponding IPA phonemes.
With spoken phonemes, you can get confidence scores indicating how likely the spoken phonemes matched the expected phonemes.
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Pronunciation assessment supports spoken phonemes in `en-US` with IPA and in both `en-US` and `en-GB` with SAPI.
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For example, to obtain the complete spoken sound for the word "Hello", you can concatenate the first spoken phoneme for each expected phoneme with the highest confidence score. In the following assessment result, when you speak the word "hello", the expected IPA phonemes are "h ɛ l oʊ". However, the actual spoken phonemes are "h ə l oʊ". You have five possible candidates for each expected phoneme in this example. The assessment result shows that the most likely spoken phoneme was `"ə"` instead of the expected phoneme `"ɛ"`. The expected phoneme `"ɛ"` only received a confidence score of 47. Other potential matches received confidence scores of 52, 17, and 2.
[Trusted launch](trusted-launch.md) is a way to enable foundational compute security on [Azure Generation 2 VMs](generation-2.md). Trusted launch protects your Virtual Machines against advanced and persistent attack techniques like boot kits and rootkits by combining infrastructure technologies like Secure Boot, vTPM and Boot Integrity Monitoring on your VM.
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> [!IMPORTANT]
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> Enabling Trusted launch on existing virtual machines (VMs) is currently not supported for following scenarios:
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> - Azure Generation 1 VMs is currently not supported.
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> - Azure Virtual Machine Scale Sets (VMSS) Uniform & Flex are currently not supported.
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> - If enabled for Generation 2 VM, **[Server-side encryption with customer-managed keys](disk-encryption.md)** (SSE-CMK) should be disabled before executing Trusted launch upgrade. SSE-CMK encryption should be re-enabled after completion of Trusted launch upgrade.
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> - Support for **enabling Trusted launch on existing Azure Generation 1 VMs** is currently in private preview. You can gain access to preview using registration link **https://aka.ms/Gen1ToTLUpgrade**.
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> - Enabling Trusted launch on existing Azure virtual machine scale sets (VMSS) Uniform & Flex are currently not supported.
-[Trusted launch supported OS Image](trusted-launch.md#operating-systems-supported). For custom OS image or disks, the base image should be **Trusted launch capable**.
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- Azure Generation 2 VM(s) is not using [features currently not supported with Trusted launch](trusted-launch.md#unsupported-features).
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- Azure Generation 2 VM(s) should be **stopped and deallocated** before enabling Trusted launch security type.
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- Azure Backup if enabled for Generation 2 VM(s) should be configured with [Enhanced Backup Policy](../backup/backup-azure-vms-enhanced-policy.md). Trusted launch security type cannot be enabled for Generation 2 VM(s) configured with *Standard Policy* backup protection.
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- Azure Backup if enabled for VM(s) should be configured with [Enhanced Backup Policy](../backup/backup-azure-vms-enhanced-policy.md). Trusted launch security type cannot be enabled for Generation 2 VM(s) configured with *Standard Policy* backup protection.
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- Existing Azure VM backup can be migrated from *Standard* to *Enhanced* policy using private preview migration feature. Submit on-boarding request to preview using link https://aka.ms/formBackupPolicyMigration.
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## Best practices
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1. Log in to [Azure portal](https://portal.azure.com)
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2. Validate virtual machine generation is **V2** and **Stop** VM.
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:::image type="content" source="./media/trusted-launch/02-generation-2-to-trusted-launch-stop-vm.png" alt-text="Screenshot of the Gen2 VM to be de-allocated.":::
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:::image type="content" source="./media/trusted-launch/02-generation-2-to-trusted-launch-stop-vm.png" alt-text="Screenshot of the Gen2 VM to be deallocated.":::
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3. On **Overview** page in VM **Properties**, Select **Standard** under **Security type**. This navigates to **Configuration** page for VM.
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