Synthesis Theory - Chapter 20

Internals of Digital Signal Processors

Background: Musical Synthesis Hardware

Levels of Design

Fundamantals of Digital Synthesis Hardware

• Pulse tone Synthesis
• Sample Generation
• Pulse tone Synthesis versus Sample Generation

Criteria for Digital Sound Quality

• Sampling Rate
• Input/Output Sample Width
• Internal Coding Resolution
• Floating-point versus Fixed-point Systems
• Wavetable Size
• Frequency Resolution and Tuning

Computational Demands of Digital Synthesis

• Time-division Multiplexing
• DSP Performance Factors
• Data memory and Program Memory
• I/O Bandwidth

Architecture if Digital signal Processors

• Fixed- versus Variable-function DSP Architectures
• Differences between General-purpose Microprocessors and DSPs
• RISC Microprocessors for DSP
• Fractional Addressing
• Operation of a DSP
• Example of DSP Architecture
• The Question of Branching
• Parallelism and Pipelining within a Single DSP
• The Parameter Update Problem
• Method 1: Provide an Update Period
• Method 2: Provide a DSP Controller
• MIDI Black Boxes
• Discussion of the Parameter Update Problem

Programming and Microprogramming a DSP

• Microprograms
• Horizontal Microcoding
• Advantages and Disadvantages of Microprogrmming

VLSI and DSP

• Benefits of VLSI
• The Trend to Miniaturization: Background
• Low Power Consumption: Background

Array Processors

• Operations of an Array Processor

Multiprocessor Architectures

• Fixed-function versus General Processing Element
• Data Flow
• Connectionist Architectures

• Conclusion

Ichiro Fujinaga 1998.04.20