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Appendix F

Encodings


Introduction

This appendix provides encoding information that is compiled into the CT Access Voice Message service.

Encoding Descriptions

The following table provides the encoding values, names, and descriptions:

Value

Name

Description

1

VCE_ENCODE_NMS_16

NMS ADPCM, 16 kbit/s

2

VCE_ENCODE_NMS_24

NMS ADPCM, 24 kbit/s

3

VCE_ENCODE_NMS_32

NMS ADPCM, 32 kbit/s

4

VCE_ENCODE_NMS_64

NMS framed PCM 64 kbit/s

10

VCE_ENCODE_MULAW

mu-law 64 kbit/s

11

VCE_ENCODE_ALAW

A-law 64 kbit/s

13

VCE_ENCODE_PCM8M16

PCM, 8 k samples/sec., 16 bits per sample

14

VCE_ENCODE_OKI_24

OKI ADPCM 6 k samples/sec., 24 kbit/s

15

VCE_ENCODE_OKI_32

OKI ADPCM 8 k samples/sec., 32 kbit/s

16

VCE_ENCODE_PCM11M8

PCM, 11 k samples/sec., 8 bits per sample, mono

17

VCE_ENCODE_PCM11M16

PCM, 11 k samples/sec., 16 bits per sample, mono

20

VCE_ENCODE_G726

CCITT G.726 ADPCM, 32 kbit/s

22

VCE_ENCODE_IMA_24

IMA/DUI ADPCM 6K samples/sec., 24 kbits/s

23

VCE_ENCODE_IMA_32

IMA/DUI ADPCM 6K samples/sec., 24 kbits/s

Encoding Names

The following table provides the encoding names, values, encoding information, and WAVE information:

Encoding Information

WAVE
Information


Name


Value

Frame
Size
(Bytes)

Frame
Time
(msec)

WAVE
Type

Num
Chan

Sample
Rate

Data
Rate

Block
Size

Bits/
Sample

VCE_ENCODE_NMS_16

1

42

20

0x38

1

8000

2100

42

2

VCE_ENCODE_NMS_24

2

62

20

0x38

1

8000

3100

62

3

VCE_ENCODE_NMS_32

3

82

20

0x38

1

8000

4100

82

4

VCE_ENCODE_NMS_64

4

162

20

0x38

1

8000

8200

162

8

VCE_ENCODE_MULAW

10

80

10

7

1

8000

8000

1

8

VCE_ENCODE_ALAW

11

80

10

6

1

8000

8000

1

8

VCE_ENCODE_PCM8M16

13

160

10

1

1

8000

16000

2

16

VCE_ENCODE_OKI_24

14

30

10

0x17

1

6000

3000

1

4

VCE_ENCODE_OKI_32

15

40

10

0x17

1

8000

4000

1

4

VCE_ENCODE_PCM11M8

16

110

10

1

1

11025

11025

1

8

VCE_ENCODE_PCM11M16

17

220

10

1

1

11025

22050

2

16

VCE_ENCODE_G726

20

40

10

2

1

8000

4000

1

4

VCE_ENCODE_IMA_24

22

36

10

0x11

1

6000

3600

244

4

VCE_ENCODE_IMA_32

23

46

10

0x11

1

8000

4600

244

4

Note: If you are using an AG board, refer to the ADI Service Function Reference Manual for a list of DSP files that are required for each encoding format.



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