This is from the Radio 3 site - seems to be pretty clear
About Radio 3
BBC Radio 3 Help and Advice
Listening to Radio 3
Radio 3 is broadcast in the UK on 90 - 93FM, on Digital Radio and via digital TV. Radio 3 is also broadcast online both within the UK and internationally. It is possible to listen to the last 7 days of Radio 3 broadcasts in HD Sound via Radio 3 programme pages or BBC iPlayer. An increasing number of programmes are permanently available online.
HD Sound
Radio 3 is the first BBC radio station to offer 'HD' quality streams for both live and on demand listening.
What is HD Sound?
HD sound means High Definition sound.
Sound reaches our ears via analogue sound waves. However processing these sound waves electronically tends to distort their original shape. Modern digital processing is much less distorting. The conversion of an analogue signal to a digital signal is achieved by sampling the sound waves. We are now delivering the sampled 'HD' sound at a rate of 320 kb/s (AAC), which delivers more audio information and results in better sound, compared to the previous rate of 192 kb/s.
Can I hear 'Listen again' in HD too?
Yes, both live and on demand streams are now available in HD.
About Radio 3
BBC Radio 3 Help and Advice
Listening to Radio 3
Radio 3 is broadcast in the UK on 90 - 93FM, on Digital Radio and via digital TV. Radio 3 is also broadcast online both within the UK and internationally. It is possible to listen to the last 7 days of Radio 3 broadcasts in HD Sound via Radio 3 programme pages or BBC iPlayer. An increasing number of programmes are permanently available online.
HD Sound
Radio 3 is the first BBC radio station to offer 'HD' quality streams for both live and on demand listening.
What is HD Sound?
HD sound means High Definition sound.
Sound reaches our ears via analogue sound waves. However processing these sound waves electronically tends to distort their original shape. Modern digital processing is much less distorting. The conversion of an analogue signal to a digital signal is achieved by sampling the sound waves. We are now delivering the sampled 'HD' sound at a rate of 320 kb/s (AAC), which delivers more audio information and results in better sound, compared to the previous rate of 192 kb/s.
Can I hear 'Listen again' in HD too?
Yes, both live and on demand streams are now available in HD.
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