Sits in a loop listening for keyword actions (defined in the switch from line 72 to 108). You must have Windows Speech Recognition configured and running before you run this script.

gistfile1.ps1

[Reflection.Assembly]::LoadWithPartialName("System.Speech") > $null


function InitGrammar {
  param(
		$Attention,
		$CommandArray
	)
	
	$choices = new-object System.Speech.Recognition.Choices($CommandArray)
	$GrammarBuilder = new-object System.Speech.Recognition.GrammarBuilder($Attention)
	$GrammarBuilder.Append($choices)
	$Grammar = New-Object System.Speech.Recognition.Grammar($GrammarBuilder)
	return $Grammar
}

function GetRE {
	param(
		$Grammar
	)
	$re = New-Object System.Speech.Recognition.SpeechRecognitionEngine
	$re.SetInputToDefaultAudioDevice()
	$re.LoadGrammar($Grammar)
	return $re
}

function out-say {
	param(
		[Parameter(ValueFromPipeline=$true)]
		$Text,
		[switch]$async
	)
	begin {
		if(!$global:ss) {
			$global:ss = New-Object speech.Synthesis.SpeechSynthesizer
		}
	}
	process {
		if($async) {
			$global:ss.speakasync($Text)
		} else {
			$global:ss.Speak($Text)
		}
	}
}
	
$Attention = "computer"
$Commands = @("stop", "help", "beep", "get jobs", "clean jobs", "get weather")
$g = InitGrammar -Attention $attention -CommandArray $Commands
$re = GetRE $g

out-say "Hello my name is $attention, what can I do for you?"

$keepGoing = $true
while($keepGoing) {
	$result = $re.Recognize()
	if($result -and $result.words.count -gt 0) {
		$FirstWord = $result.Words[0]
		Write-Debug "$($result.text) at $($result.confidence)"
		Write-Debug "Heard $($FirstWord.text) at $($FirstWord.confidence)"
		if($result.words.Count -gt 1 -and $FirstWord.text -eq $Attention) {
			$AvgConfidence = 0
			$result.Words | %{
				$AvgConfidence += $_.Confidence
			}
			$AvgConfidence = $AvgConfidence / $result.Words.Count
			$WordsTextArr = $result.Words | select -ExpandProperty text
			$command = [string]::Join(" ", $WordsTextArr, 1, $WordsTextArr.Count - 1)
			Write-Debug "Heard $($command) at $($avgConfidence)"
			if($AvgConfidence -gt .75) {
				switch ($command) {
					"stop" {
						out-say "goodbye"
						Write-Host "Ending Recognition"
						$keepGoing = $false
					}
					"help" {
						out-say ("Try saying: " + [string]::Join(" ", $Commands))
						Write-Host ("Try saying: " + [string]::Join(", ", $Commands))
					}
					"beep" {
						[Console]::Beep()
					}
					"get jobs" {
						$RunningJobs = @(Get-Job | ?{$_.state -eq "running"})
						$CompletedJobs = @(Get-Job | ?{$_.state -ne "running"})
						out-say "$($RunningJobs.count) running jobs."
						out-say "$($CompletedJobs.count) completed jobs."
					}
					"clean jobs" {
						$StaleJobs = @(Get-Job | ?{$_.state -ne "running"})
						if($StaleJobs) {
							out-say "$($stalejobs.count) completed jobs"
							$StaleJobs | Remove-Job
							if( !(Get-Job | ?{$_.state -ne "running"}) ) {
								out-say "cleaned up"
							}
						}
					}
					"get weather" {
						#$intro = out-say "Please wait while I access the current conditions" -async
						$wc = New-Object net.WebClient
						$Weather = ConvertFrom-Json $wc.downloadstring("http://api.openweathermap.org/data/2.5/weather?q=Dallas,%20TX")
						$Condition = $Weather.Weather.Main
						$Temp = [Math]::Round((($Weather.Main.Temp - 273.15) * 1.8 + 32), 0)
						$Wind = [Math]::Round(($Weather.Wind.Speed * 2.23694), 0)
						out-say "It is currently $condition skies and $temp degrees outside, with wend speed $wind miles per hour"
					}
					default {
						Write-Warning "Unknown word $($command)"
					}
				}
			} else {
				out-say "Please say that again"
				Write-Warning "I'm not sure what you said ($($command))"
			}
		} else {
			Write-Debug "Ignoring attention command"
		}
	}
}