Quote:
Originally Posted by ApK
I've never known those choke cores to have an noticeable effect on anything in an audible frequency range. I believe they are to address high frequency EMI.
Any improvement on the speech recognition in the car?
|
no improvement with recognizing the wake word. too much road noise.
i also discovered that if the power source did not come from the car, then audio via the 3.5 mm cable does not exhibit any noise. so it's the electrical power from the car combined with the 3.5 mm audio cable plugged into the car that produces the buzzing/humming. grounding issue?
UPDATE:
i got a ground loop isolator from amazon (Mpow Ground Loop Noise Isolator) and it completely eliminated the buzzing/humming. and i believe that the elimination of this extra noise improved somewhat on the recognition of the wake word. so using this device also had the affect of improving echo dot's listening skills.
next up: echo dot produces quite a considerable amount of heat. just feel the bottom after it's been powered for a while. it's not burning to the touch, but it does get quite warm when it's been sitting on a desk, let's say. so when running in the car, i would not want to put it anywhere that would allow the sun to beat down directly on it. and it's best to allow the bottom to vent. so don't have it sit directly on the dash. perhaps it's best to attach a metal plate to the bottom and use a magnetic mounting system so that the bottom can be vented. i would also cover it up while the car is parked. heat can build up pretty fast in a closed vehicle on sunny days. i have not powered it up after it's been sitting in a parked car under a sunny sky. but like most personal electronics, i would suspect that the built up heat needs to be vented before it would start. covering it up also serves to hide the device from would-be thieves.