Lisa Bock discusses digitizing a signal along and compares the various codecs in the G.700 series that encode or decode a data stream to remove redundancies and improve transmission speeds.
- [Instructor] 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 and 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.…The range of human hearing…is between 20 and 20,000 cycles per second.…
Testing demonstrates a human can understand speech…in the frequency range between 300 and 3,300 hertz,…this is called the voiceband range.…Digitization takes an analog signal…and approximates how it should sound.…The goal is toll quality.…A codec converts the analog signal…into a digital signal for transmission.…To remove redundancies and compress the data…to enable faster transmission and conserve bandwidth.…
Codecs typically break down speech…into 20 millisecond segments.…The lower the bandwidth, the lower the quality.…A more complex algorithm will provide better quality…for a given bandwidth.…There are a number of codecs for Packet networks…
- Voice over IP (VoIP) and Unified Communications
- Digitizing a signal
- VoIP components
- Protocols used by VoIP, including TCP/IP and DHCP
- Connecting systems
- Gateways and gatekeepers
- Factors that might affect quality on a VoIP network
- Wireshark statistics
Skill Level Advanced
Wireshark: Advanced Tools and Techniqueswith Lisa Bock1h 49m Intermediate
Learning VoIP and Unified Communicationswith Lisa Bock1h 8m Intermediate
What you need to know4m 11s
1. VoIP Overview
3. Connecting Systems
4. Network Operations
5. Wireshark Statistics
Next steps1m 25s
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