PowerShell Gallery
PSSpeech is a collection of functions to work with Azure Cognitive Services, more specifically the Speech Service.

The function Get-SpeechToken can be used to get an OAuth token for authentication to the service. The function Get-SpeechVoicesList can be use to get a list of available voices and the function Covert-TextToSpeech can be used to convert a given string to speech.

Get-SpeechToken -Key <yourkey> 
Convert-TextToSpeech -Text "Hi there, how are you doing today?" -Path hithere.mp3


Download & Source for PSSpeech

The is available on the PowerShell Gallery, you can install or download it using the following commands:

Install- -Name PSSpeech -Scope CurrentUser
Save- -Name PSSpeech -Path <Path>

And you can find the source on GitHub: tomtorggler