The Sound Science of Audio Codecs

June 29, 2015 Andrew Prokop

Source: No Jitter

I have never been happy with the answer "because." No matter what the subject or question, I am not satisfied until I am told the whys, wherefores, and possible exceptions. While I can't claim to fully understand every explanation I'm provided (I still don't completely fathom relativity), I want the opportunity to try. I won't know my limits until they've been stretched.

This year for the International Avaya Users Group's annual conference, Converge2015, one of the organizers asked me to speak about audio codecs. My first reaction was, "Is there anything I can say about codecs that hasn't already been said?" After all, G.711 has been around since 1972. How can anyone with a few years of communications under his or her belt not know about a codec that was invented before cell phones, the World Wide Web, and PCs?

After mulling it over for a few days, it suddenly hit me. Instead of simply running through the different codecs, I should explain why they exist in the first place. In other words, if G.711 has been around since 1972 and it has been doing a pretty good job all these years, why do we also have G.726, G.729, G.722, etc.?

This led me to the root question that all audio codecs share: What is sound and how do we take the noise that comes from our mouths and turn it into something that can be transported across an IP network?

Let's find out.

 

 

Read More >

About the Author

Andrew  Prokop

Director of Vertical Industries

Andrew Prokop has been heavily involved with SIP and VoIP technologies since the late 1990’s. He holds four United States patents in SIP and was on the team that developed Nortel’s carrier-grade SIP soft switch and SIP-based contact center. His software runs in products from Avaya and Genband. Andrew joined Arrow SI three years ago and through customer engagements, users groups, tradeshows, and webinars has been an evangelist for SIP as a transformational technology for enterprises and their customers. Andrew understands the needs of the enterprise and has the background and skills necessary to assist companies as they drive towards a world of dynamic and immersive communications.

Follow on Twitter More Content by Andrew Prokop
Previous Article
IAUG and PasswordPro Reflections
IAUG and PasswordPro Reflections

Next Article
The Road to SIP
The Road to SIP

Want to learn more?

Contact Us!