Things to revise for paper 2

Question 1

analouge to digital converter process

Answer 1

microphone converts the sound energyinto electrical signals. the ADC samples the analouge data at a given frequency , measuring the amplitude of the wave at each point
converts it into a binary value according to the resolution or audio bit depth

Question 2

nyquists theorem

Answer 2

the sampling rate must be atleast double that of the highest frequency in the original signal

Question 3

MIDI

Answer 3

musical instrument digital interface
a midi controller carries event messages that specify pitch and duration of a note timbre vibrato and volume changes and synchronize tempo between multiple devices

Question 4

sample size for sound

Answer 4

number of samples per second * the number of bits per sample * the length of the sample in seconds

Question 5

unit nomenclature

Answer 5

kibi 2^10
mebi 2^20
gibi 2^30
tebi 2^40
pebi 2^50
exbi 2^60
zebi 2^70
yobi 2^80

Question 6

control bus

Answer 6

bi - directional bus , transmits commands , timing and specific status information netween system components

Question 7

data bus

Answer 7

typically consists of 8 16 32 or 64 seperate lines provides a bi directional path for moving data and instructions between system compoments
carry data to main memory from the processor and vice versa.

Question 8

address bus

Answer 8

the width of the address bus determines the maximum possible memory capacity of the system
used to address I/O ports during input output operations

Question 9

von neumann architecture

Answer 9

specifies the basic compoments of the computer and processor in which a shared memory and bus is used for both data and instructiosn

Question 10

stored program concept

Answer 10

machine code instructions are fetched and executed serially by a processor that performs arithmetic and logical operations

Question 11

Harvard architecure

Answer 11

physically seperate memories for instructions and data , it is used extensively with embeded Digital Signal Processing

Question 12

describe the fect execute cycle

Answer 12

1. copy contents of the program counter into the memory address register, increment value in the program counter
2. fetch the instructions from main memory and store in the memory buffer register
3. copy contents of the memory buffer regsiter into the current instrcution register

Question 13

role of interrupts

Answer 13

causes the processor to suspend what it is executing so that it can run the ISR