LogoLogo
  • Go to Docs Center
  • Plum DEV Documentation
  • Overview
  • Developer Reference
    • Tutorial
    • How to...
      • Use Plum's Transcription API
    • Audio Formats and Prompts
    • Grammars and Speech Recognition
    • Available ASR Engines
    • TTS Engine Characteristics
      • Amazon Polly TTS Engine
        • Polly Voice Tag Attribute Details
      • AT&T Natural Voices
      • Cepstral Engine
      • RealSpeak Engine
      • Vocalizer 7
        • Vocalizer 7: <voice> tag and SSML Support
    • Data Exchange
    • Logging
    • Caching
    • Root Documents
  • VoiceXML
    • Tags
      • <assign>
      • <audio>
      • <block>
      • <break>
      • <catch>
      • <choice>
      • <clear>
      • <data>
      • <desc>
      • <disconnect>
      • <else>
      • <elseif>
      • <emphasis>
      • <enumerate>
      • <error>
      • <example>
      • <exit>
      • <field>
      • <filled>
      • <foreach>
      • <form>
      • <goto>
      • <grammar>
      • <help>
      • <if>
      • <initial>
      • <item>
      • <lexicon>
      • <link>
      • <log>
      • <mark>
      • <menu>
      • <meta>
      • <metadata>
      • <noinput>
      • <nomatch>
      • <one-of>
      • <option>
      • <paragraph>
      • <param>
      • <phoneme>
      • <prompt>
      • <property>
      • <prosody>
      • <record>
      • <reprompt>
      • <return>
      • <rule>
      • <ruleref>
      • <say-as>
      • <script>
      • <sentence>
      • <speak>
      • <sub>
      • <subdialog>
      • <submit>
      • <tag>
      • <throw>
      • <token>
      • <transfer>
      • <value>
      • <var>
      • <voice>
      • <vxml>
    • Properties
      • audiofetchhint
      • audiomaxage
      • audiomaxstale
      • bargein
      • bargeintype
      • certverifypeer
      • completetimeout
      • confidencelevel
      • datafetchhint
      • datamaxage
      • datamaxstale
      • documentfetchhint
      • documentmaxage
      • documentmaxstale
      • fetchaudio
      • fetchaudiodelay
      • fetchaudiominimum
      • fetchtimeout
      • grammarfetchhint
      • grammarmaxage
      • grammarmaxstale
      • incompletetimeout
      • inputmodes
      • interdigittimeout
      • logging
      • maxnbest
      • maxspeechtimeout
      • normalizeaudio
      • recordcall
      • recordcallappend
      • recordutterance
      • recordutterancetype
      • scriptfetchhint
      • scriptmaxage
      • scriptmaxstale
      • sensitivity
      • speedvsaccuracy
      • termchar
      • termmaxdigits
      • termtimeout
      • timeout
      • universals
      • voicegender
      • voicename
    • Application and Session Variables
      • application.lastresult$[i].confidence
      • application.lastresult$[i].inputmode
      • application.lastresult$[i].interpretation
      • application.lastresult$[i].recording
      • application.lastresult$[i].recordingduration
      • application.lastresult$[i].recordingsize
      • application.lastresult$[i].utterance
      • session.callrecording
      • session.id
      • session.telephone.ani
      • session.telephone.dnis
    • VoiceXML Resources
  • Plum DEV Guide
    • Using the Plum DEV site
    • Using the File Repository
    • Outbound Calling Guide
      • Using the Outbound Tools in the DEV web UI
      • DEV Outbound Programming Notes
      • Outbound FAQs and Tips
    • Call Reporting
    • Analytics
    • VoiceTrends
    • Debugging
    • Scratchpads
    • Saved URLs
    • Voice Biometrics
    • Call Routing
    • Data Security
      • 'Private' Tags
      • Managing Secure Phone Numbers
      • Sensitive Data Types
    • SMS Guide
      • Standard Short Codes
      • SMS Debugging/Error Logs
      • Additional SMS Info
    • Single Sign On
  • Plum DEV APIs
    • DEV Outbound APIs
      • Contacts CSV Formatting
      • Outbound API Parameter Notes
      • Legacy and Miscellaneous Notes
    • SMS API
    • Call Logs API
    • Call Scheduling and Pacing API
    • Transcription API
    • Application API
    • Blocklist API
Powered by GitBook
On this page
  • normalizeaudio
  • Example
  • Explanation
  • Notes
  1. VoiceXML
  2. Properties

normalizeaudio

normalizeaudio

Default Value: true

The normalizeaudio property, when enabled, attempts to normalize a recording or utterance by boosting the gain of the audio to bring the average or peak amplitude to a target level (norm).

Example

<?xml version="1.0"?>
<vxml version="2.0">
  <form>
    <!-- TURN OFF AUDIO NORMALIZATION -->
    <property name="normalizeaudio" value="false"/>
    <record name="response">
      <prompt>
        Say something.
      </prompt>
      <filled>
        <prompt>
          You recorded: <value expr="response"/>
        </prompt>
	<exit/>
      </filled>
    </record>
  </form>
</vxml>

Explanation

From this example, “normalizeaudio” is set to false, which disables normalization. You should notice that the recording played back should be significantly quieter than regular, noramlized audio. The same applies if you were to save the recording to an audio file. A noramlized audio file will appear to be much louder than an audio file that has not been normalized.

Notes

None

PreviousmaxspeechtimeoutNextrecordcall

Last updated 5 years ago