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Automatic Noise Cancellation Problem


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69 replies to this topic

#1 OFFLINE   wd45

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Posted 16 January 2013 - 10:29 AM

Here is a weird thing.

 

I was listening to a CD while driving at 60mph on the freeway. This CD features a conga player prominently. Apparently, the Automatic Noise Cancellation system heard parts of it as engine noise, and tried to cancel it out.

 

It sounded like the classic feedback you hear from a microphone -- starts quiet and gets louder. The frequency or pitch of the sound was close to that of the engine. It was noticeable, and quite irritating.

 

So it looks like there are some types of music I'll be unable to listen to in this car. 

 

Anyone else experience this?

 

(The CD was "Cachaito" by the Afro-Cuban Jazz musician Orlando "Cachaito" Lopez.)









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#2 OFFLINE   Laurel

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Posted 17 January 2013 - 03:54 PM

I'm old and never have my radio cranked up that loud LOL.  Sounds like a good thing to me as I hate hearing cars next to me at traffic lights with their cars kabooming so loudly that their cars shake.  But for you youngsters it may be an issue. I went to Apple to listen to Cachaito as I have never heard of him, and actually the music is quite different, lively, and catchy to listen to.


Edited by Laurel, 17 January 2013 - 03:58 PM.


#3 OFFLINE   RachelnLa

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Posted 17 January 2013 - 08:11 PM

I am a bubble gum pop girl or some good old Cajun French music.
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#4 OFFLINE   PWBarrett

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Posted 17 January 2013 - 08:35 PM

I didn't think the C-Max had active noise cancellation, just some passive cancellation channeling or somesuch.

But I'm curious to try out the tunes you suggested and see what I get.

 

[Was there a particular track?]


Edited by PWBarrett, 17 January 2013 - 09:51 PM.


#5 OFFLINE   valkraider

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Posted 17 January 2013 - 10:35 PM

Yes, CMax has active noise cancellation.

It actually causes problems with the audio quality of the MFT hands-free phone system. That is one of the things which is supposed to be fixed with the 3.5.1 update.

#6 OFFLINE   wd45

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Posted 18 January 2013 - 11:11 AM

I haven't done an update on the system yet. perhaps this will address the issue. Thanks for the heads up on that, and I'll let you know if it helps.



#7 OFFLINE   PWBarrett

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Posted 18 January 2013 - 11:32 AM

Yes, CMax has active noise cancellation.

It actually causes problems with the audio quality of the MFT hands-free phone system. That is one of the things which is supposed to be fixed with the 3.5.1 update.

 

Ah - I stand corrected - I should have googled this first.  I thought the cabin noise cancellation was passive and the 3.5.1. improvement just had to do with noise cancelling microphones for hands-free calling.

But it really does have active noise cancellation  - what a cool feature.  I'm surprised they don't list it on the sticker as a standard feature.



#8 OFFLINE   JohnnOhio

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Posted 19 July 2013 - 06:34 PM

Anyone know how to turn on the active noise cancelation? The car I test drove had it on and working (nice and quiet)
My max I ordered isn't quiet at all. Need to know how to turn it on.

#9 OFFLINE   zhackwyatt

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Posted 19 July 2013 - 06:37 PM

Anyone know how to turn on the active noise cancelation? The car I test drove had it on and working (nice and quiet)
My max I ordered isn't quiet at all. Need to know how to turn it on.

It's always one.  You can't turn it off.



#10 OFFLINE   JohnnOhio

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Posted 19 July 2013 - 06:40 PM

It's not working then. Time to go in for service.

Thanks

#11 OFFLINE   salsaguy

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Posted 19 July 2013 - 07:03 PM

going by my Nickname you can guess if filtering out salsa music in my car would irritate me...

:)

baile baile!!



#12 OFFLINE   JohnnOhio

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Posted 19 July 2013 - 07:57 PM

Cool salsaguy

Fiesta Latina !!!!!

#13 OFFLINE   ceemax71

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Posted 19 July 2013 - 08:06 PM

Anyone know how to turn on the active noise cancelation? The car I test drove had it on and working (nice and quiet)
My max I ordered isn't quiet at all. Need to know how to turn it on.

 

You cannot turn noise cancellation on or off, however it is only active when the ignition is in run and all of the doors, hood, and rear hatch are closed.



#14 OFFLINE   JohnnOhio

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Posted 20 July 2013 - 11:16 AM

Ceemax 71

It's not working at all. Never has. I hear tire whine wind noise ICE running AC compressor noise while driving. My truck with offroad tires is not much noisier to drive in than my max. I see why they put in the car. It's makes a lot of noise.

#15 OFFLINE   ArizonaEnergi

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Posted 20 July 2013 - 11:18 AM

Anyone know how to tell if the noise suppression system is NOT working?

Edited by ArizonaEnergi, 20 July 2013 - 11:19 AM.


#16 OFFLINE   ceemax71

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Posted 20 July 2013 - 01:23 PM

It is hard to find any detailed information on the active noise cancelling. But from what I could find, it is only supposed to cancel out engine noise; not tire noise, wind noise, mother-in-law noise ;), or other undesirable noise unless the noise happens to be the same frequency as the engine noise.

 

Here is the description from the shop manual:

Active Noise Control

Active noise control is an audio system feature that eliminates some of the low frequency engine noise within the passenger compartment typically induced under wide open throttle or heavy part-throttle conditions. The system uses 3 microphones, a DACMC, and the audio system speakers. The DACMC determines the noise frequency to be canceled based upon engine rotation speed data from the PCM and the microphone input signals.

While the engine is running, the active noise control microphones located in the front and rear of the headliner monitor the engine noise resonating in the passenger compartment. The microphones transmit this noise as analog signals to the DACMC, where they are converted into digital signals by the integrated analog/digital converter. The digital signals are processed and an inverted phase sound wave with the same amplitude as the original sound is created. This new sound is converted into an analog audio signal and output by the DACMC internal tone generator to all of the speakers except the instrument panel center speaker (if equipped).

 

It doesn't work quite like noise-canceling ear phones, where it cancels all sound external to the ear phone.

 

It looks like the only possible way to know if it is working or not, would be using the IDS software tool.

There are several diagnostic trouble codes associated with the active noise cancelling system.

 

I have noticed on my C-Max that at times the ICE becomes suddenly louder as though the noise cancelling temporarily stopped working.


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#17 OFFLINE   Jbtbga

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Posted 20 July 2013 - 06:50 PM

Does the noise cancellation system cause an echo? Have been hearing an echo sometimes while listening to NPR, never with music

#18 OFFLINE   fotomoto

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Posted 20 July 2013 - 07:11 PM

Does the noise cancellation system cause an echo? Have been hearing an echo sometimes while listening to NPR, never with music

 

If you are listening to that station on HD radio, you can get an echo/repeat effect when the tuner switches from digital to analog sources whenever there's a loss in signal.  On another car, I had a JVC head unit that was so bad about this I had to keep it on analog which negated the reason I bought it.  OTOH, I don't have this issue with the Sony unit in the CMax listening to the same station going down the same roads.   FWIW


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#19 OFFLINE   Jbtbga

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Posted 21 July 2013 - 03:31 PM

Thanks, fotomoto. I am sure that is it. See the HD flicker, just hadn't put 2 and 2 together

#20 OFFLINE   Jaydrama

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Posted 21 July 2013 - 04:54 PM

If you want to hear the noise cancellation in action, trying to hold it together, play some favorite music with just the rear windows down at 50-55 mph.






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