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For any of you with CTDs, have you ever noticed if someone else is driving the car and you're talking to the on the phone, there is what sounds like a turbo sound in the background if they're accelerating?

The first time I realized it, I was driving the car talking with my buddy on the phone. He asked me if I was driving a turbo car or something (he lives on the other side of the country and has never seen my car). He said he could hear the turbo spooling up and down in the background quite clearly. I told him that wasn't likely since I could rarely hear it, and most likely there must be some interference from the voltage regulator when the alternator spins up and down.

However, after he told me that I noticed that whenever my wife is driving the car and she calls me over the Bluetooth in the car, I can very clearly hear it as well. I don't see how it's possible, but it certainly sounds like a turbo spooling.

Has anyone else noticed this? I never noticed it when I had my gas Cruze.
Microphones are very sensitive electronic devices that can pick up sounds not heard or barely audible to the human ear. The ones typically used now in cellphones and cars have noise cancelling software grouped with them. It's possible the microphone is picking up the sound of turbo and isn't detecting it as background noise that should be cancelled out.
 
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