CHAPTER 2. MMC Programming2-370 © SAMSUNG Electronics Co., Ltd.[835] MGI DSP OPTIONSThis MMC provides various MGI options.MGI 16/64 Card and embedded MGI parametersNo Parameter Description Default00 AUDIO CODEC Selects the Audio Codec of an MGI card and specify thetransmission interval time of the VoIP packet.G.71101 ECHO CANCEL Enables or disables echo cancellation. This functionremoves the echo that is generated by voice reflectionand packet delay.ENABLE02 DUAL-FLT EC This option selects the Mode of Dual Filter echocancellation. It is improved echo cancellation. Thisshould be set by Analog Trunk card. If mode is selectedto Disable (Sparse EC), system should be reset.8TRK2MODE03 NLP This option controls the non-linear processor.Set NLP value (0~2).- 0: Normal level of NLP engagement. (Default)- 1: NLP Tune Option 2 (Reduced level of NLPengagement).- 2: NLP Tune Option 1 (Increased level of NLPengagement).NLP Tune Option 2 (Reduced level of NLPengagement).For applications where the default NLP level causesunpleasant voice artifacts (like choppiness at thebeginning of the call in heavy double talk situations), theHost may select the NLP Tune Option 2 setting toreduce the level of NLP engagement.NLP Tune Option 1 (Increased level of NLPengagement):For certain 2-to-4 wire hybrid or line conditions where alarger than normal non-linear component in the echo ispresent, the Host may select the NLP Tune Option 1setting for an increased level of NLP engagement inorder to provide an adequate echo control performance.The normal non-linear echo component is defined to beat a level comparable to that from G.711 companding(for example, in G.168, the only non-linear componentconsidered in the echo is G.711 companding only).This option takes effect only when EC is ON.004 EC GAIN This option is used to program the digital gain control forthe Mindspeed Comcerto Device ‘Decoder-to-EC’ signalpath, when voice decoding is active.Set EC gain value. The range is 18~38 (-14 dB ~ +6 dB)32 (0 dB)05 EC TAIL LEN Network Echo Canceller Tail Length (HECLEN).Used to set the Echo Canceller configuration.Echo Canceller Tail Length is adjustable from 8 ms to128 ms, in 8 ms increments.Set EC Tail length. The range is 8~128 ms.64 ms
