Processing of data captured by a data acquisition system

Τίτλος

Processing of data captured by a data acquisition system

Θέμα

Data processing

Computer sound processing

Oscilloscopes

Computer programming

Δημιουργός

Soteriou, Vassos

Πηγή

Higher Technical Institute

Το πλήρες κείμενο είναι διαθέσιμο από το Υπουργείο Ενέργειας, Εμπορίου Βιομηχανίας και Τουρισμού.

Εκδότης

Library of Cyprus University of Technology

Ημερομηνία

1998

Δικαιώματα

Marouchos, C.C.

Μορφή

pdf

Γλώσσα

en

Τύπος

text

Αναγνωριστικό

EED0596

Σύνοψη

The main objective of this project is the design and construction of a high sampling rate data acquisition system to capture analogue signals such as sound and perfonn processing on this data using computer programs. The data acquisition system is interfaced to an IBM XT slot (lSA slot). Using a programming language and appropriate hardware design to implement control and data signals via the ISA slot of the PC, data is sampled and stored in the memory of the computer and later into a file on a disk, hard disk or a floppy disk. The hardware and software design of the system offers the facility to make the stored data accessible by Windows® based application software such as Microsoft Excel®, in order to draw curves and analyse and manipulate the stored digital information using Excel functions. The maximum signal frequency to be sampled is 10KHZ which is determined with the use of filters, and via the sampling program the user has the option to sample electrical signals at two frequencies, 25KHz and 50KHz. The system also offers the ability to the user to reproduce the data, and it can therefore be used as a "sound card" for the IBM PC, to store sounds in digital from, retrieve them and reproduce them at any time, or just display electrical signals onto an oscilloscope.
The project is divided into two main parts: hardware and software. The first part deals with the hardware design of the system: initially a general introduction to computers is provided and the project then proceeds with the in-depth of the electronics design and signal manipulation ofthe IBM PC slot, the signal conditioning (filters, amplifiers), the address decoding, the sampling (analogue to digital converter) and the reproduction of signals (digital to analogue converter). The second part deals with the software, that is the programming language and the program composed and used to sample, accumulate and retrieve the data already stored in digital form into a file, memory or disk of the PC.