Audacity Forum

How can I output mono Microsoft PCM.wav files per the VoiP phone system requirements below? - Audacity takes the mono track and makes it into a stereo wav file

Recording Voice Prompts
"When recording voice prompts, use 8kHz sampling, mono, and 16 bits per sample and save as Microsoft PCM .wav file.

To record your own prompts you might want to try Audacity. This is an open source application available for Mac OS X, Microsoft Windows, and GNU/Linux and it is used for music recordings. It represents a good mix between powerful features and high usability (i.e. it is simple to use). Normalizing the volume after recording will most likely improve your results. Audacity also provides a noise reduction capability that shall be recommended."

Leland wrote:For you AVST users, it looks to me like you should be able to use plain old PCM WAV files. At least the (oldish) Automated Agent manual that I am looking at say that you can:

Recording Voice Prompts
Automated Agent prompts must be recorded and stored on disk as RIFF WAV
format files in the following audio formats:
• Linear PCM encoding, G.711 A-law, or G.711 μ-law
• 8.0 KHz (8,000 samples per second)
• 8 bits per sample
• Monaural
• No data compression applied

If that is still true, then you may be okay since PCM WAV files are not supposed to have the 2 extra bytes.

Leland

gfloyd, I have split your post from the topic where you posted it as your question is unrelated to that topic.
For future reference, to create a new topic on the forum, use the "New Topic" button.

I have also put the quoted text about SipX in quotation marks and in italics as it did not make sense. Please check that I have not altered the meaning of your question.

To record a mono track with Audacity 1.3.13, go to "Edit menu > Preferences > Devices" and set the "Recording Channels" to "1 (mono)".

To convert an imported stereo track to mono, select the track in Audacity and from the Tracks menu select "Stereo Track to Mono".
Use "File menu > Export" to export a WAV file.

If all of the audio in the Audacity project is single channel mono, then the exported file will be mono.