From the course: Learning VoIP and Unified Communications
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Voice signal conversion with digital codecs
From the course: Learning VoIP and Unified Communications
Voice signal conversion with digital codecs
- [Instructor] We use the phone system to communicate information. While in a conversation, we must be able to hear and understand what the other party is saying. Voice communication involves analog and digital communication. In that we speak in analog, which is a continuous wave form. In order for the signal to travel over a digital network, we digitize and encode the signal. An algorithm transforms the data before traveling over an IP network. And then it is decoded at the receiver end. When making a decision on how to reproduce the sound, there are two choices. Recreate the sound as if someone were to hear it as if they were sitting right next to the speaker or reproduce it and arrange that the brain is capable of hearing and understanding. As we see in this graphic, the range of human hearing is between 20 and 20,000 cycles per second, or 20 Hertz to 20 kilohertz. However testing demonstrates a human can…
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