Timeline of communication systems/technologies; 1870s Bell invents the electric telephone – 1890s Portable typewriter is invented – 1890s Marconi invents wireless telegraphy long distance radio – communication 1930s Regular TV broadcasting begins – Late 1930s Atanasoff invents first electronic digital computer – 1950s Laser is invented – 1980s First optical fibre system is created long distance – 1990s Berners-Lee invents the World Wide Web (www) – 1990s VCRs become popular – Impact of TWO chosen communication systems on society; Telephone (1876) Simple and fast communication Long distance communication reduces travel time Confidential Quality of communication was improved Versatile e.g. used in businesses, entertainment Electrical computer (late 1930s) Easy communication Convenient to use Used in many industries e.g. technology, multimedia, office helped to create JOBS Easy access and storage of information Improved efficiency and quantity of communication OUTCOME 2 2.4 Perform a first-hand Wave modulation (modification) allows different information to investigation to observe ways in be transmitted. which waves can be modulated to carry different types of information A wave can be modulated in 2 ways; Amplitude modulation (AM) height of the waves – Frequency modulation (FM) number of waves which pass a – point in 1 second Radio transmitter the coding device – In the AM radio transmitter:
Timeline of communication systems/technologies; 1870s – Bell invents the electric telephone 1890s – Portable typewriter is invented 1890s – Marconi invents wireless telegraphy long distance radio communication 1930s – Regular TV broadcasting begins Late 1930s – Atanasoff invents first electronic digital computer 1950s – Laser is invented 1980s – First optical fibre system is created long distance 1990s – Berners-Lee invents the World Wide Web (www) 1990s – VCRs become popular Impact of TWO chosen communication systems on society; Telephone (1876) Simple and fast communication Long distance communication reduces travel time Confidential Quality of communication was improved Versatile e.g. used in businesses, entertainment Electrical computer (late 1930s) Easy communication Convenient to use Used in many industries e.g. technology, multimedia, office helped to create JOBS Easy access and storage of information Improved efficiency and quantity of communication OUTCOME 2 2.4 Perform a first-hand investigation to observe ways in which waves can be modulated to carry different types of information Wave modulation (modification) allows different information to be transmitted. A wave can be modulated in 2 ways; Amplitude modulation (AM) – height of the waves Frequency modulation (FM) – number of waves which pass a point in 1 second Radio transmitter – the coding device In the AM radio transmitter:
Senior_Science_Notes_-_Information_Systems_2.docx