PDF, 196 Kb, 档案已发布: Jul 1, 1997
This paper is concerned with the digital implementation of spectral subtraction modified algorithm on a Texas Instruments (TI)(tm) TMS320C31 Digital Signal Processor (DSP). The algorithm was developed to suppress a car noise in speech picked up by one microphone in a running car for application in mobil hand-free telephony. The real-time implementation on floating-point processor is described. The
PDF, 609 Kb, 档案已发布: Jan 1, 1997
This paper gives and introduction on Image Coding based on Fractals and develops a simple algorithm to be used as a reference design.The Fractal Coding System described in this project was developed from the ideas proposed by Arnaud Jacquin in his paper published in IEEE Trans. "Image Coding Based on Fractal Theory of Iterated Contractive Image Transformation"Two implementations of the pro
PDF, 100 Kb, 档案已发布: Jul 1, 1997
This application report describes the implementation of a universal DSP module (UDM) to vocoders for a range of bit rates and to modems operating in the voice-band range. The UDM is based on the Texas Instruments (TI(TM)) TMS320C31 DSP. Difficulties in vocoder design are examined as well as measurement results for the HF modem under simulated HF channel environments. The error correction codi
PDF, 28 Kb, 档案已发布: Jun 1, 1997
The 'C31 bootloader is expected to be used only at reset and then the 'C31 will stay in MCBL mode the rest of the time. It is sometimes convenient that once loading is done, the MCBL/MP pin is changed to enable the microprocessor memory map. This document discusses a technique to change from bootloader mode to microprocessor mode on-the-fly.
PDF, 181 Kb, 档案已发布: Jul 1, 1997
The performance of sonar receivers on board a ship are degraded by mechanical noise. In order to improve the detection performance of the acoustic sensors (hydrophones), we have designed a local mechanical noise cancelling system using the Adaptive Noise Cancelling (ANC) approach with a single noise reference . The implementation was realized and validated on underwater acoustic signals with a PC-
PDF, 476 Kb, 档案已发布: Jul 1, 1997
The stereovision process determines the distances of objects by acquiring two images in different positions and studying the difference in locations of the corresponding stereo points. Various techniques have been developed to infer 3-D information from a set of brightness images. One technique, called passive stereovision, is appealing because of its ranging applications and especially because of
PDF, 52 Kb, 档案已发布: Jul 1, 1997
Telecommunication channels cannot be monitored in an operational mode with traditional instrumentation systems. For example, transmission anomalies are usually not detected, which affects the quality of service to the end user.This application report describes the implementation of the Texas Instruments (TI) (tm) TMS320C31 digital signal processor (DSP) as an in-service, non-intrusive measurem
PDF, 106 Kb, 档案已发布: Jul 1, 1997
As screening programs for neonatal hearing become more common, there is a need for automatic signal processing methods to classify measured signals and results. Transient click-evoked otoacoustic emissions (TEOAE) are becoming an important tool for screening, especially of hearing in newborn children, because this objective technique requires little cooperation from the patient. The principal prob
PDF, 513 Kb, 档案已发布: Aug 1, 1992
The Texas Instruments low-cost, high-performance TMS320C31 has defineda new role for digital signal processors in embedded systems. Well-suited forgeneral-purpose use, the TMS320C31 is finding widespread acceptance asan embedded controller in applications such as: Industrial automation Telecommunications Motor control Automotive Instrumentation Laser printers Scanners
PDF, 193 Kb, 档案已发布: Jul 1, 1997
This application report describes a transmission system with Orthogonal Frequency Division Multiplexing (OFDM) and Quadrature Phase Shift Keying (QPSK) over noisy multipath fading channels. When an encoder and a coherent receiver based on the maximum-likelihood estimation is added, we obtain the modulator-demodulator (COFDM MODEM) presented in this paper. The required performance was obtained th
PDF, 152 Kb, 档案已发布: Jan 1, 1998
This report provides an overview of a controller chip set to improve processor memory management and transactions while using the Texas Instruments(TI) TMS320C31 digital signal processor(DSP). This application uses a minimum number of wait states which increases processor throughput.
PDF, 65 Kb, 修订版: A, 档案已发布: Mar 1, 1996
The TI 32- and 36-bit FIFOs contain mailbox-bypass registers that transmit priority from one FIFO port to the other, port A to B or port B to A with out storing the data in the FIFO SRAM buffer. This document describes the FIFO mailbox-bypass registers and shows an example of direct memory access (DMA) control of a digital signal processor (DSP). The components described are the SN74ACT3641 and th
PDF, 131 Kb, 档案已发布: Feb 12, 2001
This application report discusses the implementation of an interface between the TLV5639 DAC and the TMS320C31 DSP. The TLV5619-5639EVM is used to demonstrate the complete circuit implementation. This EVM is the evaluation module for the TLV5639 and the TLV561 DACs that take care of all necessary signal manipulation for the control signals of the DAC. The TLV5639 is a 12-bit DAC with a microproces
PDF, 352 Kb, 档案已发布: Nov 13, 2000
This application report is written to help design engineers or technicians implement a simple data acquisition system using serial analog-to-digital converters (ADCs) and digital-to-analog (DACs) from Texas Instruments. A hardware and software solution for interfacing the TLV2541 ADC and the TLV5618A DAC to the TMS320C31 DSP with the use of the TMS320C3x DSP starter kit (DSK) is presented here.
PDF, 579 Kb, 档案已发布: Oct 6, 2000
This application report presents a hardware and software solution for interfacing the TLV2544/TLV2548 12-bit, 200Ksps, 4/8-channel, low-power, serial, successive approximation register (SAR) analog-to-digital converters (ADC) to the 32-bit floating point TMS320CX digital signal processor (DSP) through the use of the TMS320C31 DSP starter kit (DSK).A digital-to-analog converter (DAC) interface
PDF, 160 Kb, 档案已发布: Nov 1, 1995
This document describes using the TMS320 floating-point digital signal processor (DSP) optimizing C compiler and assembly language tools with the variable memory width and data sizes supported by the TMS320C32 ('C32) 32-bit DSP. An overview of the 'C32 strobe control registers is presented along with their configuration for use with a compiler linker or debugger. Different memory configurations
PDF, 376 Kb, 修订版: A, 档案已发布: May 1, 1996
The low-cost of the TMS320C32 (?C32) makes 32-bit floating-point digital signal processing (DSP) available to a wider variety of applications than ever before. This document explains in detail the features of the ?C32 enhanced memory interface with design examples for 32- 16- and 8-bit-wide external memories. Comprehensive diagrams show precise operation of the processor and complete circuits fo
PDF, 76 Kb, 修订版: A, 档案已发布: Mar 1, 1996
The SN74ACT3638 FIFO contains a patented synchronous retransmit feature which allows data stored within the FIFO to be re-read starting at a selected position. This document shows the use of the retransmit feature with a digital signal processor (DSP) for finite impulse response (FIR) filtering. The application uses the 32-bit floating-point TMS320C31 and a SN74ACT3638 bi-directional clocked FIFO
PDF, 108 Kb, 修订版: A, 档案已发布: Mar 1, 1996
FIFO memories are used in digital signal processing systems for matching data paths with asynchronous clock or data rates. This document shows the SN74ACT3632 512?36?2 clocked FIFO as a single-chip bi-directional buffering solution that interfaces to the TI TMS320C3x and TMS320C4x floating-point DSP family. Programmable FIFO flags enable DMA control techniques that are used to handle the data flow
PDF, 254 Kb, 档案已发布: Jan 1, 1995
An efficient method of detecting combustion engine knock is using spectral analysis. The detection process algorithm adapts to a no-knock reference at varying speeds and loads by using multiple frequencies. This document presents an problem overview current technology and two implementation examples are given to aid in the development of system specific hardware and software. The first system is
PDF, 248 Kb, 修订版: D, 档案已发布: Aug 6, 2004
System board-level design and end-equipment environments can impact the operation of specific commercial and military 320C3x (320C30 320C31 320LC31 320C32 and 320VC33) 320C4x (320C40 and 320C44) digital signal processors (DSPs) and the military 320MCM42x (320MCM42C and 320MCM42D) multichip modules (MCMs) during power up. The 320MCM42x MCM incorporates two 320C40 DSP die.Specifically the s
PDF, 168 Kb, 档案已发布: Nov 1, 1994
Four steps are required to set the TMS320 DSP interrupts: create a interrupt service routine initialize the vector table and set the memory map enable the interrupts in the CPU and enable the interrupt sources. This document shows how to set the interrupts in C C callable assembly or in-line C. Sample C code segments are provided. The appendix gives complete examples for setting interrupt vec