| The paper carries out a digital signal acquisition system based on DSP. The system iscomposed of digital signal processing by the DSP, the FLASH completing the programloading after power on, the Complex Programmable Logic Device-CPLD completing thelogic control of the peripherals of DSP, Using the McBSP of DSP to carry on the datacommutation between DSP and computer. The measure system is more the breath, comparing with the traditional acquisitionsystem. The maximum sampling frequency of A/D is 6MIPS, and the clock signal of A/D isclock by the exportation clock of McBSP. Thus we can control the sampling frequency of A/D,through the software programming, implementing the signal acquisition of different researchobject, economizing the cost, extending the application of the system; Moreover the DSP canlook for the data space of the address smaller, and can use the I/O less, the correspondence ofvelocity lower. We make the HPI data line using as general purpose I/O, which make the DSPlooking for the data space of the address raise consumedly, resolving the shortage of thesystem saving space. The paper is the measuring hardware core part of the item " the research of thesuperhighway traffic stream characteristics and traffic affaires direct detecting techniquebased on the characteristics of vehicles audio-frequency" and the space sound fielddistributing of bats phonating. The target of the realization is to build the system hardware,assuring the coordination work of the system, which lays the foundation for becoming theexpert system. The paper introduces the hardware designing and software designing,especially introducing the designing of digital signal processor (DSP) module, CPLD module,signal sampling and transmitting module, program loading module, and so on. The paper alsointroduces some adverting problems and experiences during the circuit debugging. Thesoftware initialization and pretreatment are mentioned briefly in the paper. It also put forwardan improving way...
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