Outputting to a microphone amp
Nick McClick
Posts: 1,003
I've been working on my Xbox live headset adapter for a while. Version 1 amplifies the headset so that you can hear other people better. I'm thinking of doing a version 2, where it helps out with the microphone and I'm looking for some advice;
The primary problem with the headset is the voice operated switch. It takes about 1/2 a second to kick on, so your first word is usually cutoff (or the whole transmission, if you only wanted to say 'yes' or 'no'). I'm thinking there are two ways to fix this;
1 - keep the channel open all the time. The headset will do duplex, but I think the only way to do this is to make a repeating sound (which may get annoying).
2 - Delay the transmission by a half second. This might be the best bet. Have the ucontroller make a startup sound that triggers the vox.
This is beyond my limited capabilities, I'm looking for a little advice.
Question 1: The headset appears to be just like a typical cell phone headset, Tip is microphone, Ring is speaker, and Sleeve is ground. I'm thinking this is an electret condenser mic. What does the circuit look like from the ucontroller to the amp? Just a blocking capaciter? Nothing at all?
Question 2: 8 bit mono pcm at 8kHz should take 8kB / second, right? So I should have enough memory on the hub for my 1/2 second delay?
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The primary problem with the headset is the voice operated switch. It takes about 1/2 a second to kick on, so your first word is usually cutoff (or the whole transmission, if you only wanted to say 'yes' or 'no'). I'm thinking there are two ways to fix this;
1 - keep the channel open all the time. The headset will do duplex, but I think the only way to do this is to make a repeating sound (which may get annoying).
2 - Delay the transmission by a half second. This might be the best bet. Have the ucontroller make a startup sound that triggers the vox.
This is beyond my limited capabilities, I'm looking for a little advice.
Question 1: The headset appears to be just like a typical cell phone headset, Tip is microphone, Ring is speaker, and Sleeve is ground. I'm thinking this is an electret condenser mic. What does the circuit look like from the ucontroller to the amp? Just a blocking capaciter? Nothing at all?
Question 2: 8 bit mono pcm at 8kHz should take 8kB / second, right? So I should have enough memory on the hub for my 1/2 second delay?
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Gadget Gangster - Share your Electronic Projects - Sign up as a Designer and get a free 4-pack of Project Boards!
Comments
Leon
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Post Edited (Leon) : 5/4/2009 7:24:23 PM GMT