ATIS T1.303 : 1989

1. Scope, Purpose and Application
1.1 Scope
1.2 Purpose and Application
2. Referenced and Related Standards
2.1 Referenced American National Standards
2.2 Other Referenced Standards
3. ADPCM Coding Algorithm
3.1 General
3.2 ADPCM Encoder Principles
3.3 ADPCM Decoder Principles
3.4 Computational Details
3.5 Digital Test Sequences
Tables
1. Quantizer Normalized Input/Output Characteristic
     for 24 kbit/s Operation
2. Quantizer Normalized Input/Output Characteristic
     for 32 kbit/s Operation
3. Quantizer Normalized Input/Output Characteristic
     for 40 kbit/s Operation
4. Input and Output Signals
5. Internal Processing Variables
6. Word Format of Test Sequences
7. Sequence of Narrowband and Broadband Signal Segments
8. Sequence of I Value Magnitudes
Figures
1. Simplified Block Diagrams
2. Encoder Block Schematic
3. Decoder Block Schematic
4. Input PCM Format Conversion and Difference Signal
     Computation
5. Adaptive Quantizer
6. Inverse Adaptive Quantizer
7. Quantizer Scale Factor Adaptation
8. Adaptation Speed Control
9. Adaptive Predictor and Reconstructed Signal Calculator
10. Tone and Transition Detector
11. Output PCM Format Conversion and Synchronous Coding
     Adjustment
12. Encoder and Decoder Configuration
13. Decoder Only Configuration

PARTIAL REVISION AND REDESIGNATION OF ANSI T1.301, TOGETHER WITH ANSI T1.302 Defines the encoding law to be used when transcoding from line formats with channels operating at pulse rates of 64 kbit/s to line formats with channels operating at pulse rates of 24-, 32-, or 40-kbit/s and conversely. ADCPM line formats are not included.