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What is audio in telecoms?

In telecommunications, audio refers to the transmission and reception of sound or speech signals between communication devices. It involves the encoding, transmission, and decoding of audio signals to enable voice communication over a network. Audio plays a fundamental role in various communication technologies, including traditional telephony, Voice over Internet Protocol (VoIP), video conferencing, and other voice-based applications.

Key aspects of audio


The process of converting analog sound waves into digital signals or packets that can be transmitted over a network. This encoding is typically done using codecs (coder-decoder) to compress and efficiently transmit the audio data.


The audio signals, now in digital form, are transmitted over a network. This can occur over traditional telephone lines, through the internet for VoIP communication, or via other digital communication channels.


At the receiving end, the transmitted audio signals are decoded back into analog sound waves. This process allows the recipient to hear the original audio message.

Quality of Service (QoS)

Ensuring high-quality audio transmission is crucial for effective communication. QoS measures in telecommunications focus on minimising latency, jitter, and packet loss to maintain clear and reliable audio.


 In traditional telephony, audio is the primary medium for voice communication over the Public Switched Telephone Network (PSTN). Analog voice signals are transmitted over copper wires between telephones.


Voice over Internet Protocol (VoIP) relies on audio data packets transmitted over the internet. VoIP technology digitises and compresses audio signals for efficient transmission, offering a cost-effective alternative to traditional telephony.

Video Conferencing

 Audio is a key component of video conferencing systems, where participants communicate through both audio and video channels. Clear and synchronised audio enhances the overall conferencing experience.

Speech Recognition

Advanced telecommunications applications may involve speech recognition technologies where audio signals are analysed by algorithms to convert spoken words into text or trigger specific actions.

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