DIY Environment Reference Wind 
Cars That Think
OCTOBER 25, 2022
A reference antenna picks up a signal from, say, a cell tower, while a surveillance antenna is tuned to the same frequency. The reference and surveillance signals are compared. The second reason is that pointing a directional antenna away from the reference source means that it’s less likely to be swamped by the reference signal.
Tony Karrer Delicious EVdriven
APRIL 19, 2009
Until then, we can always program the ESS to make what Lotus refers to as "more futuristic sounds for electric vehicles [that] can be created using sampled sounds and generated waveforms." The result is a quiet, controlled environment free of intrusive noises. Alternatively, may we suggest the sound of the neighborhood ice cream truck?
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