Hardware Description

Advance Technical Repair of Laptops Motherboard

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The integrated system is based on a single TMS320C3x DSP. Figure 3 shows the block diagram of the system hardware. Spectrum Signal Processing's TMS320C30 system board was used for software development and experiments. In production, the low cost TMS320C32 can be used. The system board has two channel input/output (I/O) capabilities. Both of the channels have 16-bit analog-to-digital converters (ADCs) and digital-to-analog converters (DACs). The integrated system requires six input and three output channels. The input channels are used for the revolutions-per-minute (RPM) signal from the car (a reference microphone was used to obtain the reference noise signal in the prototype), the received signal from the cellular base, two microphones placed at both sides of the driver's headrest, the audio signal from the stereo system, and the mode switch to determine whether the system is in HFCP mode or AANC mode. The output channels are used for the two loudspeakers and transmit signal to the cellular base. To meet I/O requirements, a four-channel I/O board consisting of two daughter modules, with Burr Brown 16-bit ADCs/DACs on it, was connected to the system board through the DSPLINK on the system board. To synchronize the operation of the system and the I/O board, the clock on the system board was disabled and daughter module A on the four-channel I/O board was used to provide the necessary clock signals for the system board and daughter module B. Therefore, the hardware is configured as shown in Table 1.

Table 1. Hardware Configuration

BOARD

CONFIGURATION

System Board

Slave

Daughter Module A

Master

Daughter Module B

Slave

There is a three-cycle delay for I/O on the four-channel board. This delay was compensated for in the software by delaying the I/O signals on the system board.

Integrated Automotive Signal Processing and Audio System

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