The ITU-T has set a standard for digital transmission systems to code analogue signals for audio compression and decompression using sub-band adaptive differential pulse code modulation at a bit rate of 64kbit/s. This standard is known as G.722 and is used for 64kbps (7kHz) audio coding, with ADPCM used to encrypt the signals in the lower and higher frequency sub-bands created by SB-ADPCM.
FAQ on ITU-T G.722 Standard Codec
If you are new to the world of digital transmission systems and audio compression, the International Telecommunications Union (ITU) and its standards are probably unknown territory. Here are some frequently asked questions about ITU-T G.722 codec to help you understand its basics:
What is ITU-T G.722 Standard Codec?
ITU-T G.722 is a standard codec used in digital transmission systems to code analogue signals into digital signals. It is specifically used for audio compression and decompression.
How does ITU-T G.722 work?
The G.722 codec uses sub-band adaptive differential pulse code modulation (SB-ADPCM) at a bit rate of 64 kbit/s for audio (speech) compression. The system name is 64 Kbps (7 kHz) audio coding. The system encrypts the signals in both the lower and higher frequency sub-bands, which are created by SB-ADPCM.
What are the advantages of ITU-T G.722?
The G.722 codec offers high-quality audio with a bit rate of 64 kbit/s, which is significantly lower than other audio codecs like G.711 (64 kbps) and G.729 (< 8 kbps). It provides excellent audio clarity, even at low bit rates, and is suitable for use in both narrowband and wideband audio applications.
What are the applications of ITU-T G.722?
The G.722 codec is widely used in digital audio transmission systems, including Voice over IP (VoIP) networks, audio streaming, videoconferencing, and telephony applications that require high-quality audio. It is also used in broadcasting and recording industries for archival purposes.
How is ITU-T G.722 different from other speech codecs?
The G.722 codec provides superior audio quality at lower bit rates compared to other speech codecs like G.711 and G.729. It supports a wide range of frequencies (50 Hz to 7 kHz) and provides efficient noise reduction while maintaining voice quality.
ITU-T G.722 is a standard codec used in digital transmission systems for compressing and decompressing audio signals. It offers high-quality audio with a low bit rate of 64 kbit/s, making it ideal for various applications such as VoIP, broadcasting, and recording. Its unique features make it stand out from other speech codecs, and its wide range of application proves its versatility.