GL2 Mic Input Characteristics--Measured at DVinfo.net

David Ennis · February 23rd, 2005, 10:40 AM

FYI, I did some extensive work on this and posted it in the "Now Hear This" forum as "Secrets of the GL2 Mic Jack."

Don Palomaki · February 25th, 2005, 05:43 AM

Interesting post at:
http://www.dvinfo.net/conf/showthread.php?s=&threadid=39981
What sound card did you use? Did you measure its output distortion levels?

David Ennis · February 25th, 2005, 09:15 AM

<<<-- Originally posted by Don Palomaki : Interesting post at:
http://www.dvinfo.net/conf/showthread.php?s=&threadid=39981
What sound card did you use? Did you measure its output distortion levels? -->>>

Good point, Don. The contribution of the sound card to the distortion I measured didn't occur to me until after I made that post. It wouldn't change my observation of the input levels at which THD took off (the threshold of clipping), but it does mean that the nominal THD's are probably somewhat better than I reported.

My computer sound source is the one built into my FIC VC19 motherboard. Uses a RealTek chipset if I recall correctly.

Don Palomaki · February 25th, 2005, 06:34 PM

Might be interesting to check the soundcard figures. There is wide variation in performance figures.

Some have 1 kHz analog output distortion levels higher than the baseline not-clipping level you measured.

http://www.pcavtech.com/soundcards/compare/index.htm has some interesting test reports. Don't recall if they looked at motherboard-based audio, (but that is a rather harsh environment for good audio).

Mariano L. Honrado Jr. · March 6th, 2005, 05:43 PM

<<<-- Originally posted by Fred Retread : FYI, I did some extensive work on this and posted it in the "Now Hear This" forum as "Secrets of the GL2 Mic Jack." -->>>

Hello Fred:

I am new to this forum and still finding my way around. How do I find the "Now Hear This" forum?

I am considering the purchase of the DM-50 mic. My initial testing testing produced very good audio indoors, however, I am less satisfied with outdoor audio using only the onboard mic. Perhaps a better understanding of its characteristics would help.

Many thanks and (from the Philippines) Mabuhay!

Mariano

David Ennis · March 7th, 2005, 02:50 PM

Mariano,
To atone for my error in creating something close to a cross post, I have replied by email

Chris Hurd · March 8th, 2005, 08:40 AM

Mariano, our "Now Hear This" forum is located here.

The main forum index is located here. Hope this helps,

February 23rd, 2005, 10:40 AM	#1
David Ennis Fred Retread Join Date: Jul 2004 Location: Hartford, CT Posts: 1,227	GL2 Mic Input Characteristics--Measured FYI, I did some extensive work on this and posted it in the "Now Hear This" forum as "Secrets of the GL2 Mic Jack." __________________ "Nothing in the world can take the place of persistence..." - Calvin Coolidge "My brain is wired to want to know how other things are wired." - Me

February 25th, 2005, 05:43 AM	#2
Don Palomaki Wrangler Join Date: Sep 2001 Location: Northern VA Posts: 4,487	Interesting post at: http://www.dvinfo.net/conf/showthread.php?s=&threadid=39981 What sound card did you use? Did you measure its output distortion levels? __________________ dpalomaki@dspalomaki.com

February 25th, 2005, 09:15 AM	#3
David Ennis Fred Retread Join Date: Jul 2004 Location: Hartford, CT Posts: 1,227	<<<-- Originally posted by Don Palomaki : Interesting post at: http://www.dvinfo.net/conf/showthread.php?s=&threadid=39981 What sound card did you use? Did you measure its output distortion levels? -->>> Good point, Don. The contribution of the sound card to the distortion I measured didn't occur to me until after I made that post. It wouldn't change my observation of the input levels at which THD took off (the threshold of clipping), but it does mean that the nominal THD's are probably somewhat better than I reported. My computer sound source is the one built into my FIC VC19 motherboard. Uses a RealTek chipset if I recall correctly. __________________ "Nothing in the world can take the place of persistence..." - Calvin Coolidge "My brain is wired to want to know how other things are wired." - Me

February 25th, 2005, 06:34 PM	#4
Don Palomaki Wrangler Join Date: Sep 2001 Location: Northern VA Posts: 4,487	Might be interesting to check the soundcard figures. There is wide variation in performance figures. Some have 1 kHz analog output distortion levels higher than the baseline not-clipping level you measured. http://www.pcavtech.com/soundcards/compare/index.htm has some interesting test reports. Don't recall if they looked at motherboard-based audio, (but that is a rather harsh environment for good audio). __________________ dpalomaki@dspalomaki.com

March 6th, 2005, 05:43 PM	#5
Mariano L. Honrado Jr. New Boot Join Date: Mar 2005 Location: Manila, Philippines Posts: 8	Re: GL2 Mic Input Characteristics--Measured <<<-- Originally posted by Fred Retread : FYI, I did some extensive work on this and posted it in the "Now Hear This" forum as "Secrets of the GL2 Mic Jack." -->>> Hello Fred: I am new to this forum and still finding my way around. How do I find the "Now Hear This" forum? I am considering the purchase of the DM-50 mic. My initial testing testing produced very good audio indoors, however, I am less satisfied with outdoor audio using only the onboard mic. Perhaps a better understanding of its characteristics would help. Many thanks and (from the Philippines) Mabuhay! Mariano

March 7th, 2005, 02:50 PM	#6
David Ennis Fred Retread Join Date: Jul 2004 Location: Hartford, CT Posts: 1,227	Mariano, To atone for my error in creating something close to a cross post, I have replied by email __________________ "Nothing in the world can take the place of persistence..." - Calvin Coolidge "My brain is wired to want to know how other things are wired." - Me

March 8th, 2005, 08:40 AM	#7
Chris Hurd Obstreperous Rex Join Date: Jan 2001 Location: San Marcos, TX Posts: 27,366 Images: 513	Mariano, our "Now Hear This" forum is located here. The main forum index is located here. Hope this helps, __________________ CH Search DV Info Net \| 20 years of DVi \| ...Tuesday is Soylent Green Day!