Figure 6-23 G729 SID subframe format in Visual C#

Scan PDF417 in Visual C# Figure 6-23 G729 SID subframe format

Figure 6-23 G729 SID subframe format
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0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 CID value Payload type = 18 Counter value PAD Length = 1 PDI =2 0 1
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G729 SID frame format (see Figure 6-20)
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Six
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Annex F: Encoding Format for Generic SID
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(This annex forms an integral part of the Implementation Agreement)
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F1 General
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ITU-T Recommendations G711, G722, G726, G727, and G728 do not contain provisions for VAD, discontinuous transmission, and CNG tailored to the specific algorithm Such procedures may be added in a generic way This annex provides the format for the communication of comfort noise parameters The comfort noise analysis and synthesis as well as the VAD and discontinuous transmission algorithms are unspecified and left implementation specific The payload format is based on Appendix II of ITU-T Recommendation G711 The comfort noise payload consists of a single octet description of the noise level
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F2 SID Subframe Format
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The generic SID subframe format is shown in Figure 6-24 The Noise Level field is coded according to Table 6-4 It represents the total noise power level that the transmitter wants to convey to the receiver Other noise characteristics, such as the spectral distribution, are not specified
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Figure 6-24 Generic SID subframe format
0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 CID value 0 Noise Level Payload type = 33 Counter value PAD Length = 1 PDI =3 0 1
MPLS Forum VoMPLS Implementation Agreement
Table 6-4a Noise Level Codes
0 29 30 31 77 78 79 126 127
Noise Level
Meaning Reserved 30 dBm0 31 dBm0 77 dBm0 78 dBm0 Reserved Idle Codeb
Table 6-4 provides code points for measured noise levels, and the full or partial use of these code points is up to the implementation
The receiver uses the default noise level
F3 Procedures
The job of VAD is to determine between active and inactive voice segments in the input signal During inactive voice segments, the role of the noisegeneration algorithm is to sufficiently describe the ambient noise A generic SID packet is sent immediately after the last active voice packet of a talkspurt It marks the beginning of silence and alerts the receiver to expect an absence of active voice packets The SID may be sent periodically during a silence period or only when there is a significant change in the background noise characteristics The generic SID subframe can be multiplexed with primary payload frames in an MPLS payload The noise-generation algorithm at the receiver uses the information in the SID to update its noise-generation model and then produce an appropriate amount of comfort noise Since other characteristics of the noise, aside from its level, are not specified, they will be chosen by the receiver If a receiver is not capable of generating the total power level specified, it may generate a different level or apply the idle code, that is, the default noise level Otherwise, the specified level should be considered a guideline
Six
If the first active voice packet following a generic SID packet selects an adaptive audio algorithm such as G726 or G727 encoding and decoding of that packet will be performed starting from an audio coder state that has been reset to its specified initial values
NOTE: This eliminates glitches that could otherwise occur if the transmitter s state were to diverge during the silence, when active voice packets are not being sent and the receiver s state is not being updated Resetting both encoder and decoder in this way maintains a synchronized state and initiates a fresh adaptation for each talkspurt, unbiased by the previous one
MPLS Forum VoMPLS Implementation Agreement
Annex G: Packet Format and Procedures for Dialed Digits
(This annex forms an integral part of the Implementation Agreement)
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