Audio Sample #1: The Female Voice
The first of my audio samples is Mrs Evelyne Resnick, wife of VUC founder Randy Resnick. That Mrs Resnick is a native of France is also noteworthy. In many cases the advantages of wideband audio are very evident when dealing with cross-cultural conference calls, where heavy accents and foreign languages can obscure what’s being said.
I had Randy ask Evelyne the following question, “What’s it like to be married to a VoIP geek?” Here’s her response in English.
The video clip is a screencast of the Cool Edit Pro timeline in spectral display mode. It clearly highlights the fact that I’ve intercut three clips to create this comparative version. The Y axis of the display reads from 0 to 22,000 Hz, consistent with the fact that the clip is sampled at 44.1 KHz like a commercial audio CD.
The first portion of the clip is G.711 encoded. This is reflected by the fact that there is no energy above about 3 KHz. The middle section, being G.722 encoded, contains energy to just over 7 KHz. The final section has energy present all the way up to 14 KHz, as we’d expect from Siren14/G.722.1C encoding.
I’m not completely certain that YouTube doesn’t in some way process the audio when I upload such clips. To overcome this potential here is an MP3 encoded version of each sample, along with a screen shot to illustrate the energy distribution in each case. Click on the text label below each screen shot to play the example file.