MC14555 Просмотр технического описания (PDF) - Motorola => Freescale

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MC14555

PCM Codec-Filter

Motorola => Freescale 

Chord Number Step

Number of Steps Size

7

16

128

Table 4. A–Law Encode–Decode Characteristics

Normalized

Encode

Decision

Levels

1

Sign

2

Chord

3

Chord

Digital Code

4

5

Chord Step

6

7

Step Step

4096

3968

1

0

1

0

1

0

1

8

Step

Normalized

Decode

Levels

0

4032

2176

2048

1

0

1

0

0

1

0

1

2112

6

16

64

1088

1

0

1

1

0

1

0

1

1056

1024

5

16

32

544

1

0

0

0

0

1

0

1

528

512

4

16

16

272

1

0

0

1

0

1

0

1

264

256

3

16

8

136

1

1

1

0

0

1

0

1

132

128

2

16

4

68

1

1

1

1

0

1

0

1

66

64

1

32

2

2

1

1

0

1

0

1

0

1

1

0

NOTES:

1. Characteristics are symmetrical about analog zero with sign bit = 0 for negative analog values.

2. Digital code includes alternate bit inversion, as specified by CCITT.

MC145554•MC145557•MC145564•MC145567

16

MOTOROLA

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