[Athen] Microphones and MacSpeech Dictate

Ed. Rosenthal edward at ngtvoice.com
Sat Feb 28 08:18:24 PST 2009

The VXI mic has excellent passive noise cancellation, and we've found it to
be one of the more accurate mics available...we often run it to the computer
with an Andrea USB converter. Unless they have changed their unit specs
here's more info on the VXI:

. Gentex Noise canceling microphone
. Ambient noise suppression: 13dB @ 1kHz, typical
. Output impedance: 1.8 kOhms typical
. Sensitivity: -50dB @ 1kHz (defined 1" from talk-side, 82dB SPL)
. Frequency response: 100Hz to 6.3 kHz, optimized for voice using the
. Operating current: 300uA max
. Operating voltage: 1.0 V DC min. to 20 V DC max.
. Speaker: Dynamic, 36mm diameter SPL: 90dB @ 1 kHz, 0.22 V input
. Impedance: 32 Ohms
. Frequency response: 100 Hz to 6.3 kHz
. Rated input power: 10 mW continuous, 100 m W peak


Edward S. Rosenthal
President and CEO
Next Generation Technologies, Inc. (NGT Inc.)
20006 Cedar Valley Rd. #101
Lynnwood, Wa. 998036-6334
Ph: 425-744-1100 ext. 15
Fx: 425-778-5547
Skype: ed.rosenthal7
EM: edward at ngtvoice.com
http://www.ngtvoice.com and http://www.ngtmedical.com

This document may have been dictated with speech recognition software.
Please disregard any remaining miscrecognitions.

-----Original Message-----
From: athen-bounces at athenpro.org [mailto:athen-bounces at athenpro.org] On
Behalf Of Shelley Haven
Sent: Friday, February 27, 2009 9:02 PM
To: Access Technology Higher Education Network; Alternate Media
Subject: Re: [Athen] Microphones and MacSpeech Dictate

Hey, Sean!

I use Dictate with a VXi TalkPro XPress which seems to work fine.
The XPress is what originally shipped with iListen and when I
"crossgraded" to Dictate, they just shipped me the software.

However, I asked technical support at MacSpeech last September what
is the brand of the generic "quality USB headset microphone" that
ships with Dictate, and what features the VXi Talk Pros offer to
justify the higher price. I was told that boxed versions now ship
with either the VXi Parrot or the Plantronics Audio 400. (A quick
check in the Stanford Bookstore shows it to be a Plantronics Audio
610, though.) She also said:

>The major difference is in the sensitivity of the mics. The

>TalkPros are much more sensitive and therefore are the better choice

>for people who will use Dictate in a noisier environment or who

>speak with a softer voice. If either of these scenarios are not

>you, then the Plantronics headset should be just fine. To be

>considered MacSpeech certified the mic had to get a minimum level of

>accuracy before we would endorse it.

Based on this, I advised a college student I was working with to
purchase the regular boxed version with the Audio 610. We got
excellent recognition accuracy during the initial training (this was
with Dictate 1.0, BTW).

Hope this helps,

Shelley Haven ATP, RET
Assistive Technology Consultant
Sunnyvale, CA

At 11:02 AM -0800 2/27/09, Sean Keegan wrote:

>Is anyone using MacSpeech Dictate and can provide some feedback on

>the USB microphone that ships with the product?


>I am curious as to the functionality and if you would recommend a

>different microphone with MacSpeech Dictate. From the MacSpeech

>page, you can "upgrade" your mic to a VXi TalkPro series, xTag, or

>Samsontech Airline. Wanted to get some feedback as to any

>real-world experiences before I commit.



>Take care,



>Sean Keegan

>Associate Director, Assistive Technology

>Office of Accessible Education - Stanford University


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