SmartyCam HD - Finally I got good Audio
03-12-2016, 11:08 AM
#16
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Hrm, I just went to great lengths to run the wires through the dash and center console and on testing the system I'm finding he same thing. There is a noticeable 1 kHz whine. I searched around a couple of the sound design, audio, and computer forums, and it looks like this is most often an issue of on-board power supply and DACs interfering, usually on the device/board itself. This means there's is probably not much to be done other than get this feedback to AiM.
I'll try messing around with the gain and other soft settings, and maybe playing with some grounded shielding anyway. If the diagnosis above is correct it would make sense that this is pretty common, and that using the cable from the DL with the jack, connected to an externally powered mic would work. But how could AiM release the external mic with that interference issue? The question is not outrage, it's hope that there is some configuration that works a bit better.
I have the SC HD GP, with the external mic wire from the SoloDL, which is, in turn, wired into the CAN directly. Any ideas or info?
Edit, also, I'll try the trick from the OP in case that will let the device record with less gain, and send the whine deeper into the background. (Hey, it's a theory)
I'll try messing around with the gain and other soft settings, and maybe playing with some grounded shielding anyway. If the diagnosis above is correct it would make sense that this is pretty common, and that using the cable from the DL with the jack, connected to an externally powered mic would work. But how could AiM release the external mic with that interference issue? The question is not outrage, it's hope that there is some configuration that works a bit better.
I have the SC HD GP, with the external mic wire from the SoloDL, which is, in turn, wired into the CAN directly. Any ideas or info?
Edit, also, I'll try the trick from the OP in case that will let the device record with less gain, and send the whine deeper into the background. (Hey, it's a theory)
It sounds to me like the easiest fix is is a simple car stereo power supply choke fix. Something to isolate the alternator whine (leaking diodes) from the power supply? I'd try that first.
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www.peterkrause.net
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Specializing in Professional, Private Driver Performance Evaluation and Optimization
Consultation Available Remotely and at VIRginia International Raceway
03-12-2016, 11:26 AM
#17
It sounds like it would only be with the external mic, and the frequency sort of rules out an issue with the car's power supply. If it were a weakness of the design it would be interference between the voyage converter to power the external mic and the DAC on the same logic board, right inside the SCHD GP unit itself.
Like you point out, it's an unsubstantiated but educated guess, and your experience and reply easily helps disprove that guess! Just double checking that you have had many external mic add-ons with the GP unit that have been whine-free?
I'll mess around with it a bit and come back with what I find.
BUT, while I have your attention I also don't see the brake indicator in the SC display. I'm assuming there is just something that isn't configured correctly there that I can find and fix, since I'm wired into the CAN and see throttle, rpm, speed, and all that.
Like you point out, it's an unsubstantiated but educated guess, and your experience and reply easily helps disprove that guess! Just double checking that you have had many external mic add-ons with the GP unit that have been whine-free?
I'll mess around with it a bit and come back with what I find.
BUT, while I have your attention I also don't see the brake indicator in the SC display. I'm assuming there is just something that isn't configured correctly there that I can find and fix, since I'm wired into the CAN and see throttle, rpm, speed, and all that.
03-12-2016, 12:48 PM
#18
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Which car? Which configuration on the Solo DL?
03-12-2016, 08:48 PM
#19