For the purpose of this document, the following definitions apply.
Time interval of 20 ms, corresponding to the time segmentation of the Adaptive Multi Rate speech Codec, also used as a short term for a traffic frame.
Block of 95..244 information bits transmitted on the speech traffic channels.
Frame that conveys information about the acoustic background noise.
Traffic frame that has been classified as SPEECH_GOOD or SPEECH_BAD frame.
Boolean flag, generated by the VAD algorithm indicating the presence ("1") or the absence ("0") of a speech frame.
classifies the received frame.
classifies the frame to be transmitted.
A period of frames added at the end of a speech burst in which VAD flag ="0" and TX_TYPE is ="SPEECH_GOOD", this period provides the encoder with an extra window to derive the Comfort Noise parameters .
For the purpose of this document, the following symbols apply.
Number of elapsed frames since the last updated SID frame.
For the purpose of this document , the following abbreviations apply.
Source Controlled Rate operation
Telecommunication Standard, Technical Specification
Global System for Mobile Telecommunication
GSM Enhanced Full Rate speech Codec
ARIB PDC-EFR 6.7 kBit/s speech Codec
Radio Access Network
TIA IS-641 Enhanced speech Codec
TIA TDMA-US1 (12.2 kBit/s Codec, similar to GSM-EFR)
Voice Activity Detector