What is Codec?

Codec stand for coder and decoder. Coder is a process to convert our analogue voice into a digital data. For example when we say “hello” the digital signal that might be produced by the coder could be a series of digital signal like this : 111000111001001010001. This digital signal will be produced by the coder accurately.

For the coder to work, there must be a microphone. A microphone is a device that will transform our voice which is a sound wave into a voltage signal. Coder will process the voltage signal into a series of digital data or binary data of 0 and 1.

VoIP processor will process the digital data. Some of the process are data compression, data encryption, packetization and so on.

Decoder is a process the convert the voice packet back to analogue voice that we can hear. This is a reverse process of the coder. For decoder to work, a speaker is needed. Decoder will transform the voice packet into digital data and analogue voltage signal. The voltage signal will cause the speaker to produce a sound wave.

There are many VoIP codec standard available such as G.711, G.729 and so on.

 

Articles :

VoIP Basic

VoIP Phone

Using VoIP Through Normal PSTN Telephone

What is Codec?

 

Understanding PIC16F877A

Product Development Using PIC16F877A

More Product Development Using PIC16F877A

PIC16F877A Input Output Overview

Interfacing PIC16F877A With LCD

 

Microcontroller

What is a Microcontroller?

Microcontroller Specification

Programming PIC16F877A

Playing with a C Programming and PIC16F877A

Creating a Digital Clock using PIC16F877A, LCD and DS1337 Clock IC from Dallas

How to Load Hex File into PIC16F877A

 

Lightning Surge Testing

Bit Error Rate Testing

Insertion Loss Testing

 

Light Emitting Diode

DC Power Jack

Voltage Regulator and Diode

Transistor and Operational Amplifier

Trimmer Pot, Relay and PCB