ITU-T G.729 Annex C+ Floating-Point Implementation

Glossary of Key Terms

Glossary of Key Terms

Term / Acronym	Definition
ACELP	Algebraic Code-Excited Linear Prediction. A speech coding algorithm.
Administration	A term used for conciseness to indicate both a telecommunication administration and a recognized operating agency.
Annex C+	The specific part of the G.729 Recommendation that defines the reference floating-point implementation for integrating the G.729 main body with Annexes B, D, and E.
Bit-exactness	A requirement that the floating-point implementation produces identical output to the fixed-point specification on a bit-for-bit level.
CNG	Comfort Noise Generation. A function used during periods of silence in a conversation to generate artificial background noise, preventing the listener from thinking the line is dead.
Corrigendum	An official document issued to correct errors in a previously published text.
CS-ACELP	Conjugate Structure Algebraic Code-Excited Linear Prediction. The specific speech coding algorithm used in the G.729 standard.
DTX	Discontinuous Transmission. A method used in digital wireless communication to conserve power and bandwidth by turning off the transmitter when the user is not speaking. Functionality is provided by Annexes D and E.
Floating-point	A method of representing real numbers that can handle a wide dynamic range, as opposed to fixed-point arithmetic. Annex C+ provides a floating-point implementation.
IEC	International Electrotechnical Commission. An international standards organization that prepares and publishes standards for electrical, electronic, and related technologies. Mentioned as a collaborative partner with ITU.
ISO	International Organization for Standardization. An international standard-setting body composed of representatives from various national standards organizations. Mentioned as a collaborative partner with ITU.
ITU	International Telecommunication Union. The United Nations Specialized Agency in the field of telecommunications.
ITU-T	ITU Telecommunication Standardization Sector. The permanent organ of the ITU responsible for studying technical, operating, and tariff questions and issuing Recommendations on them to standardize telecommunications worldwide.
LPC	Linear Predictive Coding. A method used in audio signal processing and speech processing for representing the spectral envelope of a digital signal of speech in compressed form.
PCM	Pulse Code Modulation. A method used to digitally represent sampled analog signals. It is the standard form of digital audio in computers and various digital audio formats.
SID	Silence Description. Special frames transmitted during DTX operation to inform the receiving end about the characteristics of the background noise.
VAD	Voice Activity Detection. A technique used in speech processing to detect the presence or absence of human speech. It is a key component of DTX.
WTSC	World Telecommunication Standardization Conference. A conference held by the ITU-T every four years to establish the work program and structure of the ITU-T Study Groups.