B2 Audio Frame Format of Sampled Speech in Visual C#

Scanner PDF417 in Visual C# B2 Audio Frame Format of Sampled Speech

B2 Audio Frame Format of Sampled Speech
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For G711 audio encoding, sampled-based encoding is used with a fixed interval of 5 ms In each interval, G711 audio samples are accumulated to yield a sequence of 40 encoded samples These are concatenated in chronological order, with the earliest positioned at the most significant bit (MSB) of the first octet Formats for G711 64 Kbps are shown in Figure 6-8 They are the same for A-law and -law PCM A G711 encoded voice subframe consists of one or more audio frames, with each audio frame consisting of 40 samples of 1 octet each (5 ms per interval)
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MPLS Forum VoMPLS Implementation Agreement
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PCM 4 PCM 8 PCM 12 0 1 2
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Figure 6-8 G711-64 audio frame 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 PCM 1 PCM 5 PCM 9 PCM 2 PCM 6 PCM 10 PCM 3 PCM 7 PCM 11
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PCM 29 PCM 33 PCM 37
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PCM 30 PCM 34 PCM 38
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PCM 31 PCM 35 PCM 39
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PCM 32 PCM 36 PCM 40
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7 8 9
B3 Transfer Characteristics
Encoding interval of audio frame: Number of audio frames in encoded Voice subframe: Support of M Packetization time: M 5 ms 1 to 6
2 is required 5 M ms
A range of 1 to 6 can optionally be supported
Payload Type 8 0
Description of Algorithm G711-64 (A-law) G711-64 ( -law)
Encoding Format Reference Figure 6-8 Figure 6-8
Bit Rate (Kbps) 64 64
Voice Transfer Structure (Octets) 40 40 M M
Six
B4 Examples of G711-64 Subframe
Figure 6-9 G711-64 A-law primary payload with M 2
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 PCM 1 PCM 5 PCM 9 Payload type 8 PCM 2 PCM 6 PCM 10 Counter value PCM 3 PCM 7 PCM 11 Length 20 PCM 4 PCM 8 PCM 12 PDL =0 0
1 2 3
PCM 69 PCM 73 PCM 77
PCM 70 PCM 74 PCM 78
PCM 71 PCM 75 PCM 79
PCM 72 PCM 76 PCM 80
18 19 20
Figure 6-10 G711-64 -law primary payload with M 2
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 PCM 1 PCM 5 PCM 9 Payload type = 0 PCM 2 PCM 6 PCM 10 Counter value PCM 3 PCM 7 PCM 11 Length = 20 PCM 4 PCM 8 PCM 12 PDL =0 0
1 2 3
PCM 69 PCM 73 PCM 77
PCM 70 PCM 74 PCM 78
PCM 71 PCM 75 PCM 79
PCM 72 PCM 76 PCM 80
18 19 20
MPLS Forum VoMPLS Implementation Agreement
Annex C: Encoding Format for Audio Algorithm G726-32
(This annex forms an integral part of the Implementation Agreement)
C1 General
G726-32 ADPCM supports bit rates of 32 Kbps The encoding produces 4 bits every 125 s Encoded values are represented with the sign bit as the MSB (see Tables 7/G726 through 10/G726) ITU Recommendation G726 does not define an intrinsic SID and may be used with the generic SID of Annex F If this is the case, the audio coder and decoder will be reset synchronously at the beginning of each talkspurt, as described in Annex F3
C2 Audio Frame Format of Sampled Speech
The audio frame format requires G726 outputs to be accumulated over an interval of 5 ms to yield a sequence of 40 encoded values These are concatenated in chronological order, with the earliest positioned at the MSB of the first octet Formats for the coding rates of 32 Kbps are shown in Figure 6-11 A G726-32 encoded voice subframe consists of one or more audio frames; each audio frame consists of 40 samples that are 4 bits each (5 ms per interval and packed in 20 octets)
Figure 6-11 G726-32 audio frame 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 ADPCM 1 ADPCM 9 ADPCM 2 ADPCM 3 ADPCM 4 ADPCM 5 ADPCM 6 ADPCM 7 ADPCM 8 0 1 2 3 4
ADPCM 10 ADPCM 11 ADPCM 12 ADPCM 13 ADPCM 14 ADPCM 15 ADPCM 16
ADPCM 17 ADPCM 18 ADPCM 19 ADPCM 20 ADPCM 21 ADPCM 22 ADPCM 23 ADPCM 24 ADPCM 25 ADPCM 26 ADPCM 27 ADPCM 28 ADPCM 29 ADPCM 30 ADPCM 31 ADPCM 32 ADPCM 33 ADPCM 34 ADPCM 35 ADPCM 36 ADPCM 37 ADPCM 38 ADPCM 39 ADPCM 40
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