TheiTay
Posts: 16
Joined: Tue Feb 17, 2015 10:39 pm

Rpi 2 - Background noises

Thu Feb 19, 2015 7:39 pm

Hello, recently I purchased a new RPI 2 (Model B), This pi was supposed to control my surrounding system but unfortunately it has major background noises from the 3.5mm jack. Before using this pi 2 I used the first RPI (Model B) to control the system, it also had some background noises but it was nothing compared to the new one.

As I understood, it was supposed to be the opposite - the newer pi (since model B+), have better audio circuit, but the results are proofing else.

Any ideas?

TheiTay
Posts: 16
Joined: Tue Feb 17, 2015 10:39 pm

Re: Rpi 2 - Background noises

Wed Feb 25, 2015 8:50 pm

Bump...

drgeoff
Posts: 9924
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Re: Rpi 2 - Background noises

Wed Feb 25, 2015 9:32 pm

What sort of cable are you using? If a 4-pole jack one that has incorrect wiring for the RPi, it will be superimposing video on the audio.

fruitoftheloom
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Re: Rpi 2 - Background noises

Wed Feb 25, 2015 9:35 pm

TheiTay wrote:Hello, recently I purchased a new RPI 2 (Model B), This pi was supposed to control my surrounding system but unfortunately it has major background noises from the 3.5mm jack. Before using this pi 2 I used the first RPI (Model B) to control the system, it also had some background noises but it was nothing compared to the new one.

As I understood, it was supposed to be the opposite - the newer pi (since model B+), have better audio circuit, but the results are proofing else.

Any ideas?
Incorrect cable ?? http://www.raspberrypi-spy.co.uk/2014/0 ... video-jack
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PeterGrecian
Posts: 4
Joined: Mon Jul 16, 2012 11:24 am

Re: Rpi 2 - Background noises

Thu Feb 26, 2015 9:31 pm

This is a genuine problem, because it happens on my Pi 2 during playing test audio:

> aplay /usr/share/sounds/alsa/Front_Center.wav

but stops shortly after.

Using the current Rasbian and I'd love to find a fix

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kusti8
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Location: USA

Re: Rpi 2 - Background noises

Thu Feb 26, 2015 10:29 pm

PeterGrecian wrote:This is a genuine problem, because it happens on my Pi 2 during playing test audio:

> aplay /usr/share/sounds/alsa/Front_Center.wav

but stops shortly after.

Using the current Rasbian and I'd love to find a fix
What cable are you using to connect? Is it fully in?
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PeterGrecian
Posts: 4
Joined: Mon Jul 16, 2012 11:24 am

Re: Rpi 2 - Background noises

Sat Feb 28, 2015 12:16 pm

It is fully in and it is a stereo audio jack where the video ring is grounded.

Also, the noise is associated with what the pi is doing: playing audio, not the cable, so it is definitely not the cable.

Also, through HDMI, there is no background noise, but the audio is highly distorted and the hydrogen drum machine plays slowly.

This is independant of running jackd, pulseaudio or just alsa, and I suspect it is a driver issue.
I've done the firmware update and an apt-get upgrade and am running the 2015-02-16 Raspbian

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Douglas6
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Location: Chicago, IL

Re: Rpi 2 - Background noises

Sat Feb 28, 2015 3:12 pm

Have you seen this post: http://www.raspberrypi.org/forums/viewt ... 44#p706744? There seems to be a problem with the onboard audio driver. Try editing /boot/config.txt and adding this line:

Code: Select all

disable_audio_dither=1

TheiTay
Posts: 16
Joined: Tue Feb 17, 2015 10:39 pm

Re: Rpi 2 - Background noises

Mon Mar 02, 2015 12:34 pm

Douglas6 wrote:Have you seen this post: http://www.raspberrypi.org/forums/viewt ... 44#p706744? There seems to be a problem with the onboard audio driver. Try editing /boot/config.txt and adding this line:

Code: Select all

disable_audio_dither=1
Thank you!
This really made the noise much lower, good as the first RPI that I had. I guess that for even better performance I'll have to wait to a bug fix or buy a usb to 3.5mm dongle.

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RaTTuS
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Re: Rpi 2 - Background noises

Mon Mar 02, 2015 12:39 pm

the analogue audio is not brilliant , use hdmi audio for better results or a SPI audio
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SunayK
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Re: Rpi 2 - Background noises

Fri Apr 28, 2017 7:08 pm

I was facing simillar issue no Audio or lot of noise and infact i did reinstall OS, finally I found that my issue was with servoblaster using as pwm, As servoblaster use PIN 18 which is used for 3.5 audio Jack also, using PCM flag --pcm i was able to get back my audio. Please find more detail on this site http://www.leenabot.com/en/Driving-Serv ... pberry-Pi/. Hope this is helpful for other who are using servoblaster.
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