John said:Problem is... I'm using a Logitech headset microphone for
sound/speech/command input. My computer does what I tell it to do.
Unfortunately, seems that sometimes it hears sound that should be
piped only through the speakers. I'm sure it's not hearing the sound
coming from the speakers, it appears to be something in the circuitry.
In other words... I use a USB headset microphone for speech input.
Sound output is through speakers. But the system appears to be piping
sound output into the headset microphone circuitry. This has happened
with two different Logitech USB headsets.
Seems that the problem occurs even when the speakers are muted.
I might try a spare soundblaster audigy sound card, using the speaker
out from that instead of from the built-in sound. Somehow, maybe that
won't interfere with the USB microphone input.
Not that it matters, but... I'm using Windows Speech Recognition and
Vocola for voice-activated scripting, in Windows 8.
When you have two entirely different pieces of hardware, it's
pretty hard for the signals to just meander from one piece of
hardware to the other.
How loud a person talks, can be a function of what they hear.
And to stop people from shouting while wearing a headset, they
sometimes mix some microphone signal, into the earphones.
That's so the speaker will talk at a more normal level,
and not exaggerate their speech.
Your wiring would have to be particularly poorly shielded, for
coupling between conductors with a large separation. I'd choose
to believe it's a software trick instead. Like some mixer or
sound driver, knows headphones are involved, and some
mixing of input with output is required for better perceived