29 Jul
2004
29 Jul
'04
2:30 a.m.
Hi,
I have my keyboard midi ports connected to my computer through the
game port on my motherboard sound card. It works fine, except I'm
hearing some noise through the audio output on my keyboard when the
midi cable is plugged into my computer. Whenever my computer is on
(whether or not the keyboard is), I hear a buzz, and it gets louder
whenever the hard disk is in use. Is there anything I can do to
correct this? Is it because I have a cheap sound card? I've thought
about getting a somewhat better soundcard, possibly an SB Live!, or a
USB midi interface instead of my gameport midi interface. Any
suggestions?
Phil Carter
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29 Jul
29 Jul
5:50 a.m.
Phil Carter wrote:
I have my keyboard midi ports connected to my computer
through the
game port on my motherboard sound card. It works fine, except I'm
hearing some noise through the audio output on my keyboard when the
midi cable is plugged into my computer.
Apparently, some MIDI IN connector has pin 2 connected to the ground,
which is a Bad Thing(TM) to do; see
<http://www.midi.org/about-midi/electrical.shtml>.
Is there anything I can do to correct this? Is it
because I have a
cheap sound card? I've thought about getting a somewhat better
soundcard, possibly an SB Live!, or a USB midi interface instead
of my gameport midi interface.
The ground loop might be caused by your gameport MIDI interface, so
there is the possibility that you have a chance that a USB MIDI
interface might fix the problem, if you're lucky. However, many other
devices get this wrong, too.
You could try to 'modify' your interface so that pin 2 (the middle
pin) of the MIDI IN connector is permanently disconnected ...
Regards,
Clemens
2 Aug
2 Aug
5:17 p.m.
I looked at my midi cable and it does have pin 2 on midi in grounded.
I'll fix it when I get a chance and see if that helps.
Phil Carter
--- Clemens Ladisch <clemens(a)ladisch.de> wrote:
Phil Carter wrote:
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I have my keyboard midi ports connected to my
computer through
the
game port on my motherboard sound card. It works
fine, except I'm
hearing some noise through the audio output on my keyboard when
the
midi cable is plugged into my computer.
Apparently, some MIDI IN connector has pin 2 connected to the
ground,
which is a Bad Thing(TM) to do; see
<http://www.midi.org/about-midi/electrical.shtml>.
Is there anything I can do to correct this? Is it
because I have
a
cheap sound card? I've thought about getting
a somewhat better
soundcard, possibly an SB Live!, or a USB midi interface instead
of my gameport midi interface.
The ground loop might be caused by your gameport MIDI interface, so
there is the possibility that you have a chance that a USB MIDI
interface might fix the problem, if you're lucky. However, many
other
devices get this wrong, too.
You could try to 'modify' your interface so that pin 2 (the middle
pin) of the MIDI IN connector is permanently disconnected ...
Regards,
Clemens
7446
days inactive
7450
days old
linux-audio-user@lists.linuxaudio.org
2 comments
2 participants
participants (2)
-
Clemens Ladisch -
Phil Carter