ATIS T1.303 : 1989
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
DIGITAL PROCESSING OF VOICE-BAND SIGNALS-ALGORITHM FOR 24, 32 AND 40 kbit/s ADPCM - ADAPTIVE DIFFERENTIAL PULSE-CODE MODULATION
02-04-2017
12-01-2013
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
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