Re: [Arm-netbook] car "infotainment" doesn't upgrade....

luke.leighton <luke.leighton <at> gmail.com> writes:

it's because they use a $0.15 part <at> 433mhz with a wide-band reception instead of a $1 part with proper narrow-band filtering. i assume that this is also the reason why, if you are locked out of your car, you can ask someone with a GSM mobile phone to press a duplicate door-opener AT THEIR END of the conversation...

Luke, you said this with too straight a face. Maybe you're just taking the piss, but GSM uses a voice codec with between 3k and 12k of bandwidth. If it's not an audible part of speech, the codec should drop it to the floor.

So, in Britain, are car-door openers audible?