Lecture 2. Design of airborne digital computers

DESIGN OF AIRBORNE DIGITAL COMPUTERS

Lecture 2

Plan

1. ABDC's architecture, the main units

2. Classification of signals

3. Sampling and quantization

4. Signal recovery methods (extrapolation and interpolation)

5. Kotelnikov's theorem

Architecture of airborne digital computers

ROM

RAM

Sampling - the process of converting an analog signal to discrete one.

The signals can be:

• analog
• discrete
• digital

Continuous value - discrete time

Continuous time - discrete value

Discrete time - discrete value

Analog and discrete signals using the example of current in the microphone circuit

Sampling

The process of measuring the instantaneous values of continuous-time signal in a discrete form.

Each sample voltage is rounded off (Quantized) to the closest available level and then converted to its correspondence code.

Quantization

Signal recovery methods (extrapolation and interpolation)

Least square method (LS)

Difference between Interpolation and Extrapolation

What is Interpolation and Extrapolation ?

The chose of sampling interval

Kotelnikov´s theorem

Aliasing and Nyquist

Kotelnikov´s theorem

Thanks!