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#1
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USB headset microphone picking up line/speaker output
John Doe wrote:
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. Thanks. 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 ambient sound. Paul |
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#2
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USB headset microphone picking up line/speaker output
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. Thanks. |
#3
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USB headset microphone picking up line/speaker output
Paul nospam needed.com wrote:
John Doe wrote: 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. I appreciate the feedback, y'all. The problem doesn't exist using the same USB headset microphones in Windows XP with Dragon Naturally Speaking. In windows of old, sound properties included sliders for various recording sources. The choice of recording source sometimes included WAV output. Another weird thing is that the very same WAV sounds can be played at the same volume from the file manager, without interfering with speech recognition input. The problem occurs only during script playback when using those sounds as queues. Vocola voice activated scripting uses this command. RunProgram("D:\files\wav\special effects\boop.wav") Apparently that just opens the file using the assigned program. But I suspect it could be somehow related. Lousy lead, but that's about it. I'll try plugging in the sound card. If that don't work, oh well, I'll definitely post the fix if and when I find it. I use sounds regularly for script playback. -- 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 ambient sound. Paul |
#4
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USB headset microphone picking up line/speaker output
It's not speaker output feeding back through the microphone, the
feedback happens when the speakers are muted. But it's inconsistent. I think it changes when I run a voice activated script. So I think it has to do with Windows Speech Recognition and maybe Vocola. For some strange reason, WSR starts (and stops) listening to WAV output as well as microphone input. I suppose it's a bug in WSR, but conceivably it could have to do with Vocola. |
#5
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USB headset microphone picking up line/speaker output
BWAAAAAHAHAHAHAAAAA!!!
Solved. For the record. According to Eric from an Windows Speech Recognition web group/forum... This is the echo cancellation from the audio object. Disable it by making this DWORD value and setting it to 0, in the registry. HKEY_CURRENT_USER\SOFTWARE\Microsoft\Speech\AudioI nput\AudioFeatures \AcousticEchoCancellation The registry key AudioFeatures didn't even exist, but adding that setting appears to stop the interference. Disabling echo cancellation solves a problem that looks like echo. Strange but true. 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. Thanks. |
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