LO2: Lesson Notes

 Distribution: 

• DAB
• Digital Audio Broadcasting
• digital transmission is made up of a string of ones and zeros 
• no frequency bands to stick to 
• the signal can be sent multiple times for the receiver to pick up - more reliable than traditional radio FM
• the quality isn't always as clear as FM 
• FM
• Frequency Modulation
• one of the radio broadcasting systems in the UK
• uses frequencies from 87.5MHz to 108MHz
• has a better quality sound than DAB
• have to tune it in yourself
• the signal is more prone to dropping in and out - with distance and disturbance
• LW - AM - Long Wave 
• Amplitude Modulation 
• oldest radio broadcasting system
• all radio stations broadcast in mono - singular sound, one sound level rather than two to specify between left and right
• BBC Radio 4 + BBC Radio 5 - AM stations
• MW - AM - Medium Wave
• TV - Freeview, Sky, Virgin 
• Online
• Mobile Phones/Apps
• advantage - can still listen to radio programmes after they are on air or live - can skip through the parts you don't want to listen to 
• Digital Musical Players