I’ve recently started to develop a grumpy streak with respect to the use of certain terminology with respect to telephony. Maybe telephony isn’t exactly the right word, let’s say that my unease arises from some odd terms surrounding audio quality in the context of communication. I think that some of the language needs to be more application sensitive.
A few years ago the world was a simpler place. The “Plain Old Telephone System” (aka POTS) was definitely a narrowband medium. Where “narrowband” implied digital sampling at 8 KHz and a useful audio channel of 300 Hz – 3,400 Hz.
Some people using more advanced systems enjoyed “wideband” audio. Wideband in that case was defined as a 16 KHz sampling yielding a useful audio channel of 50 Hz – 7 KHz. The TIA-920 standard, which I have referenced previously, spells this out. A variety of audio codecs can deliver this capability including; AMR-WB, EVRC-WB, G.722, G.722.1, CELT & Opus.
In the post-roll of last week’s VUC call I got into a thread about webcams and various aspects digital video encoding. While many in the VUC audience already have some understanding of the related principles, it occurred to me that there may be some folks that visit this site who would be interested a primer on the basics of video compression.
Then by some serendipitous twist I found this video on the subject by Drew Tyler, Instructor of Digital Media at Weber State University in Utah. He covers the basics in a pretty good live presentation, even if he is a bit of an Apple fan-boy.
Holy cow, I just tried to pass G722 and Speex wideband through voip.ms and it choked !! I can’t believe it, I thought they were supposed to be one of the more competent providers.
This person’s presumption was that if the call is between accounts at the same service provider it doesn’t traverse a media gateway, and so should support any desired codec. While the logic was basically sound, clearly this wasn’t the case as the person soon found out.
Zoiper is the First 3rd Party Softphone to Support Skype’s SILK, Polycom’s SIREN and the Broadvoice Codecs
How does that sound? Pretty major, right? Wanna know more? Here are the details.
Given that ZoIPer Communicator is available in web, Windows, Mac & Linux flavors this could jump them to the head of the class for HDVoice support in a soft phone. And of course, ZoIPer Communicator has long supported both SIP and IAX protocols. Yes, you have options. Very nice.