A-level Computing 2009/AQA/Problem Solving, Programming, Data Representation and Practical Exercise/Fundamentals of Data Representation

Pure Binary Representation of Denary Integer Binary Arithmetic Representation of signed integers by Two’s Complement The Concept of Number Bases: Denary, Binary and Hexadecimal Integers and Numbers with a Fractional Part
 * Describe the representation of unsigned denary integers in binary. Perform conversion from denary to binary and vice-versa.
 * Add two binary numbers and multiply two binary numbers.
 * Describe the use of Two’s Complement to perform subtraction. Convert a denary integer into Two’s Complement and vice versa.
 * Describe the conversion of a denary integer to hexadecimal form and vice versa. Describe the use of hexadecimal as shorthand for binary.
 * Draw a distinction between integers and numbers with a fractional part in a computer context.Describe how an unsigned denary number with a fractional part is represented in fixed-point form in binary.


 * /Bit patterns in a computer/
 * Denary, Binary and Hexadecimal number systems
 * /Binary arithmetic/
 * /Binary fractions/
 * /Two's complement/
 * /Status register/

Describe standard coding systems for coding character data. Differentiate between the character code representation of a denary digit and its pure binary representation. Error checking and correction Gray coding
 * Understand ASCII
 * Understand Unicode
 * Parity bits, Hamming code.
 * Describe Gray coding. Explain why and where it is used.


 * /Information coding schemes/
 * /ASCII/
 * /Unicode/
 * /Error checking and correction/
 * /Parity bits/
 * /Hamming code/
 * /Gray coding/

Images
 * Describe how bit patterns may represent other forms of data including graphics and sound.
 * Bitmapped Graphics
 * Bitmaps: resolution, colour depth and simple bitmap file calculations.
 * Vector Graphics
 * Vector graphics: drawing list – objects and their properties.
 * Compare bitmaps to vector graphics; advantages, disadvantages.
 * The need for compression and basic techniques for compression.

Sound files
 * The need for compression and basic techniques for compression.
 * Sampled Sound and Nyquist-theorem
 * Sampling resolution, sampling rate.
 * Sound Synthesis
 * Describe MIDI and its advantages for storing sound digitally.
 * Streaming audio
 * Explain what it is and why it is used.
 * Analogue and Digital Data. Analogue and Digital Signals
 * Differentiate between analogue and digital data and analogue and digital signals.
 * Analogue to Digital Converter
 * (ADC) Describe the principles of operation of an analogue to digital converter.


 * /Images/
 * /Bitmaps/
 * /Vectors/
 * /Comparison between vector and bitmaps/
 * /Sounds/
 * /Analogue and digital/
 * /Sampled sound/
 * /Sound compression/
 * /Nyquist-theorem/
 * /Sound synthesis/
 * /Streaming audio/