Analogue To Digital Conversion System Theory And Application

Digital signals propagate more efficiently than analog signals, largely because digital impulses, which are well-defined and orderly, are easier for electronic circuits to distinguish from noise, which is chaotic. This is the chief advantage of digital modes in communications. Computers "talk" and "think" in terms of binary digital data; while a microprocessor can analyze analog data, it must be converted into digital form for the computer to make sense of it.

A typical telephone modem makes use of an ADC to convert the incoming audio from a twisted-pair line into signals the computer can understand. In a digital signal processing system, an ADC is required if the signal input is analog.

Analog-to-digital conversion is an electronic process in which a continuously variable (analog) signal is changed, without altering its essential content, into a multi-level (digital) signal.

The input to an analog-to-digital converter (ADC) consists of a voltage that varies among a theoretically infinite number of values. Examples are sine waves, the waveforms representing human speech, and the signals from a conventional television camera. The output of the ADC, in contrast, has defined levels or states. The number of states is almost always a power of two -- that is, 2, 4, 8, 16, etc. The simplest digital signals have only two states, and are called binary. All whole numbers can be represented in binary form as strings of ones and zeros.

CERTIFICATION PAGE

DEDICATION

ACKNOWLEDGEMENT

ABSTRACT

CHAPTER ONE

1.1STATEMENT OF PROBLEM

1.2PURPOSE OF STUDY

1.3IMPORTANCE OF STUDY

1.4DEFINITION OF TERMS

1.5ASSUMPTION OF STUDY

CHAPTER TWO

2.0 LITERETURE REVIEW

2.1 ADC TYPES

CHAPTER THREE

3.0 CONCEPT OF ADC SYSTEM

3.1 RESOLUTION

3.2 RESPONSE TYPE

3.3 ACCURACY

3.4 QUANTIZATION ERROR

3.5 NON-LINEARITY

3.6 SAMPLING RATE

3.7 ALIASING

3.8 DITHER

CHAPTER FOUR

4.0 APPLICATIONS OF ADC SYSTEM

4.1 MUSIC RECORDING

4.2 DIGITAL SIGNAL PROCESSING

4.3 AUDIO CONVERTER

4.4 BETA ENCODING

CHAPTER FIVE: CONCLUSION

5.1LIMITATION OF STUDY

5.2SUGGESTION FOR FURTHER RESEARCH

5.3 REFERENCES