campos wrote:
Hi,

I'm trying to do some research work in Speech Recognition. I just
notice that a good microphone is very important for the accurary rate.
It seems that USB headset with microphone is better. But it's too hard
for me to choose. Would you please recommend one for me? Price could
be $50 - $100. Thanks in advance!

The following are NOT USB - they plug into microphone/earphone sockets.

Logitech headset Dialog-812/stereo + Microphone - OEM - £6.48
http://www.ebuyer.com/product/48085

Logitech Dialog-811 Mono Headset & Microphone - 3.5mm Jack - OEM - £6.60
http://www.ebuyer.com/product/48087

Both work very well (check ebuyer's customers reviews on above links)

(I prefer the mono version as it leaves the other ear to answer the
telephone)

--
Adrian C