In the United States they use FM HD. In FM HD, the digital signal is hidden on either side of the FM frequency. So every FM station can have additional digital stations. It works a bit like Teletext. The signal can't be perceived in the FM but it is there and contains the digital sound codec. This system allows more FM stations to persist and still provide digital stations. Ordinary FM transistor radios will still pick up the FM signal but you need new radios to pickup the additional digital stations.

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Tuesday, 29 April 2025
Digital Radio
Digital Radio is different around the world, In most of Europe they use DAB+. MP4 the whole signal turns of and on in pulses to encode the characters in the data stream. This allows for more stations to be crammed into smaller bandwidths. The problem with this is you need to buy new radios to pick up the signal and the micro chip in the radio is working hard to decompress the signal.
Wednesday, 9 April 2025
Tennis Balls and the Sun
Tennis Balls were originally white but sir David Attenborough, who was the head of the BBC at the time decided they should be yellow so they could be seen clearly on colour (colour) TV screens. White balls were very easy to see on black and white screens but not so clear on colour ones.
In space the sun is white but the blue portion of the light separates from the ray when it passes through the atmosphere and makes the remaining colours appear yellow. The Blue portion of the sun light eventually becomes scattered and causes the sky to appear blue.
So the sun and tennis balls both originally appear white.
Sources
~2024 QI facts by John Lloyd
~BBC
~ NASA.gov website
Labels:
sun,
tennis balls
Tuesday, 8 April 2025
Otis Law Suit
A Jury were heading to the court room and found themselves stuck in the lift. The lift was made by the Otis Company.
The Jury were heading to a law suit against the Otis lift company. They went into an Otis lift that broke down on the way to the court room.
source QI Facts
Labels:
otis
Sunday, 6 April 2025
Give Me a Name
I asked some artificial intelligence systems to give me a name based on what I'm interested in and their perception of my personality. I have been talking to the them for a long time.
ChatGPT named me Dust walker
Gemini called me Retro Canyon
meta ai called me Spark
kuki called me Star
Grok has stopped operating in the UK.
You can ask AI to give you a name if you tell it a little bit about yourself.
Tuesday, 1 April 2025
New A.I. on the block
Meta, the company that owns Facebook and Instagram has joined the AI club. The A.I. software is called Meta A.I. and the interface runs inside the meta owned what's app messenger.
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