Posts: 354
Joined: Tue Apr 15, 2014 11:39 pm

Odd noise in audio playback

Sat Aug 12, 2017 10:19 pm

I have my pi setup as a headless server (link to pics in signature), i have a mpd server running on it to play mp3 files over it's audio output, now and then it will make a odd noise that is hard to describe (i really need to record it), but it takes a lot of time to happen usually happens the next day if i let it play overnight

when i first set this up using a regular B board on wheezy this was not a issue, but since upgrading to a b+ board with Jessie and re doing the inside of my case it now happens (too many variables to determine the cause)
odd thing it my card had got corrupt somehow and when i fixed it the noise quit happening for a few months (maybe the card is becoming corrupt again? but this issue was going on for at least 6 months before other issues manifested)
at first i suspected it was noise in the audio cable coming from the 110 AC to i put a higher grade cable in place
* i have confirmed it is not the speakers
* noise length varies from less that one second to a few seconds

has anyone experienced anything like this?
Pi config/kernel/cpu/os info

Code: Select all

[email protected]:~ $ cat /boot/config.txt 
# For more options and information see
# http://rpf.io/configtxtreadme
# Some settings may impact device functionality. See link above for details

# uncomment if you get no picture on HDMI for a default "safe" mode

# uncomment this if your display has a black border of unused pixels visible
# and your display can output without overscan

# uncomment the following to adjust overscan. Use positive numbers if console
# goes off screen, and negative if there is too much border

# uncomment to force a console size. By default it will be display's size minus
# overscan.

# uncomment if hdmi display is not detected and composite is being output

# uncomment to force a specific HDMI mode (this will force VGA)

# uncomment to force a HDMI mode rather than DVI. This can make audio work in
# DMT (computer monitor) modes

# uncomment to increase signal to HDMI, if you have interference, blanking, or
# no display

# uncomment for composite PAL

#uncomment to overclock the arm. 700 MHz is the default.

# Uncomment some or all of these to enable the optional hardware interfaces

# Uncomment this to enable the lirc-rpi module

# Additional overlays and parameters are documented /boot/overlays/README

# Enable audio (loads snd_bcm2835)

# Don't need GPU so it does not need more ram than required

# Needed with newer kernerls than 3.12 to use thermel sensors

#Enable IR LED/Reciever (also see /etc/modules)
[email protected]:~ $ cat /etc/modules
# /etc/modules: kernel modules to load at boot time.
# This file contains the names of kernel modules that should be loaded
# at boot time, one per line. Lines beginning with "#" are ignored.

# Enable IR LED/Receiver (next 2 lines)
lirc_rpi gpio_out_pin=26 gpio_pin_in_pin=none
[email protected]:~ $ lsb_release -a
No LSB modules are available.
Distributor ID:	Raspbian
Description:	Raspbian GNU/Linux 8.0 (jessie)
Release:	8.0
Codename:	jessie
[email protected]:~ $ uname -r
[email protected]:~ $ cat /proc/cpuinfo 
processor	: 0
model name	: ARMv6-compatible processor rev 7 (v6l)
BogoMIPS	: 697.95
Features	: half thumb fastmult vfp edsp java tls 
CPU implementer	: 0x41
CPU architecture: 7
CPU variant	: 0x0
CPU part	: 0xb76
CPU revision	: 7

Hardware	: BCM2835
Revision	: 0010
Serial		: 00000000d0d39aa1
My Pi Server: http://imgur.com/a/6xIUI | Thermostat: http://imgur.com/a/4LVnT

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