CELP SPEECH CODER FOR TMS320C30 USING SPOX (CONTAINS SCANNED TEXT)

This chapter shows how a 4.8-kbps CELP (code-excited linear prediction) can be quickly developed using SPOX. Using TMS320C30 DSP power, the ease of use provided by C, and the SPOX DSP library, an efficient and portable coder can be developed quickly and compiled and executed on a variety of hardware platforms.

The chapter's main sections include:

- A 4.8-kbps CELP coder

- Implementation

- Input/Output

- Spectrum Analysis

- Filters

- Pitch and codebook search

- Assembly language enhancements

- Performance

Certain applications require the TMS320C30's high arithmetic throughput but in the IEE floating-point format. These applications benefit from a acustom chip that performs conversions between the TMS320C30 native format and the single-precision IEEE Standard 754-1985. This chapter describes this custom chip.

The description includes the following specific topics:

- External interfaces

- Architectural overview

- Converter operating modes

- Interrupts

- Software application examples

- Hardware application examples

- JTAG/IEEE-1149.1 scan interface

Go to the Engineering Design Center to locate information on other TI Semiconductor devices.

(c) Copyright 1998 Texas Instruments Incorporated. All rights reserved.
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