HOLMImpulse: Measuring Frequency- & Impulse-Response - Page 42 - diyAudio
Go Back   Home > Forums > Design & Build > Software Tools

Software Tools SPICE, PCB CAD, speaker design and measurement software, calculators

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 18th September 2009, 11:55 AM   #411
diyAudio Member
 
Join Date: Mar 2003
Location: Denmark, Copenhagen
Default Supporting more channels

Quote:
Originally Posted by breez View Post
...I use the EMU 0404 USB which features 2 channels of analog inputs and outputs and 2 channels of digital S/PDIF inputs and outputs. The digital channels are available as channels 3 and 4 through ASIO and DirectSound. While the digital input is less useful, the output would have been used in many occasions if common measurement software supported multichannel (I know ARTA doesn't).
I use the EMU 0404 USB myself And need more channels to

I'm working on it - rewriting my wrapper layer to PortAudio - A VU-Meter will also come soon.
__________________
Follow your first Impulse with HOLMImpulse
  Reply With Quote
Old 22nd September 2009, 11:38 PM   #412
diyAudio Member
 
Join Date: Mar 2003
Location: Denmark, Copenhagen
Default New Release 1.4.0.4 (bugfixes + features)

Quote:
Originally Posted by panomaniac View Post
Tried that, it does not work well here. Seems the same problem on measurements I take and ones that a friend sends me. Is there some test I can try to verify?
Please try again with this new version

New Release 1.4.0.4 (bugfixes + features)
http://www.holmacoustics.com/downloa.../ChangeLog.txt

Version 1.4.0.4 (2009-09-23)

Features/Changes:
* Record Meter (Alt+F1)
* Supporting 4 channels soundcards
* Seperating MME, DirectSound, ASIO

Bugfixes:
* High ressult when using logsweep or chirp
* Time-zero Auto detect
* Memory Allocation error for low- & high-pass

-----------------------------
Comments
The record meter can help you adjust the volume - Now I guess we need a sound generator (pink noise) while adjusting volume in the windows mixer or the soundcard hardware
Attached Images
File Type: png ScreenShot004.png (29.3 KB, 297 views)
__________________
Follow your first Impulse with HOLMImpulse
  Reply With Quote
Old 22nd September 2009, 11:45 PM   #413
diyAudio Member
 
Join Date: Mar 2003
Location: Denmark, Copenhagen
Default Version 1.4.0.4 is supporting more channels

Quote:
Originally Posted by breez View Post
The digital channels are available as channels 3 and 4 through ASIO and DirectSound. While the digital input is less useful, the output would have been used in many occasions if common measurement software supported multichannel (I know ARTA doesn't).
I managed to get my USB EMU 0404 make a digital loopback - could though only measure at 88.2 kHz and 96 kHz - and only using ASIO
__________________
Follow your first Impulse with HOLMImpulse
  Reply With Quote
Old 23rd September 2009, 04:19 AM   #414
Key is offline Key  United States
diyAudio Member
 
Join Date: Jan 2009
Thanks for the ASIO support. This program owns.
  Reply With Quote
Old 23rd September 2009, 07:37 AM   #415
breez is offline breez  Finland
diyAudio Member
 
Join Date: Jul 2004
Location: Finland
Quote:
Originally Posted by askbojesen View Post
I managed to get my USB EMU 0404 make a digital loopback - could though only measure at 88.2 kHz and 96 kHz - and only using ASIO
Hey, thanks a bunch! I will be trying out the software just this evening. I have always had problems with 192 KHz sampling rate on EMU0404 USB using ARTA so I never expect it works correctly (dropouts in acquisition).
  Reply With Quote
Old 23rd September 2009, 08:44 PM   #416
diyAudio Member
 
Join Date: Sep 2008
Nice meter! Would it be possible to have i selectable to linear for greater accuracy?
Recording meters are usually linear for that reason.

I am looking at the EMU0404 USB, is it something you recommend?

Dual channel measurement would be cool.

Thanks again for making an excellent tool even better. Soon there will be nothing HOLMImpulse can't do.
  Reply With Quote
Old 23rd September 2009, 09:05 PM   #417
diyAudio Member
 
Join Date: Mar 2003
Location: Denmark, Copenhagen
Default The USB EMU 0404

Quote:
Originally Posted by David_Web View Post
Nice meter! Would it be possible to have i selectable to linear for greater accuracy?
Recording meters are usually linear for that reason.

I am looking at the EMU0404 USB, is it something you recommend?

Dual channel measurement would be cool.

Thanks again for making an excellent tool even better. Soon there will be nothing HOLMImpulse can't do.
EMU 0404
I like it - cheap compared to performance price here: http://www.thomann.de/gb/emu_0404_usb.htm

Advantages (I have found):
- The phontom works acoording to 48 V specs (Not all soundcard does that...)
- Can work as a DAC/ADC without PC
- Bit perfect with lock on clok (internal/external)
- Works with MME/DirectSound/ASIO
- Low noise
- Solid box
- External PSU
- Many samplerates and dedicated clocks (192 kHz and 176.4 kHz)

Disadvantages (I have found):
- Very hard to get all channels/samplerates working on Linux
- Digital in/out only working with ASIO channel 3,4
- External PSU (When doing field recordings)
- The USB 2.0 cable can only be 1-2 meter
__________________
Follow your first Impulse with HOLMImpulse
  Reply With Quote
Old 23rd September 2009, 09:09 PM   #418
diyAudio Member
 
Join Date: Mar 2003
Location: Denmark, Copenhagen
Default Linear recording meter?

Quote:
Originally Posted by David_Web View Post
Nice meter! Would it be possible to have i selectable to linear for greater accuracy?
Recording meters are usually linear for that reason.
HOLMImpulse can't do.
Well you are not able to see the noise floor at eg. -60 dB = 0.01 = 1% using a linear recording meter... If you adjust the minimum to - 20 dB you will have the same accuracy. I guess what you want is a aboslute scale depending on your hardware - we need a pistonphone abolute callibration of the microphone.
(Or a voltage meter calllibration when measuring electric signals)
__________________
Follow your first Impulse with HOLMImpulse
  Reply With Quote
Old 23rd September 2009, 09:23 PM   #419
breez is offline breez  Finland
diyAudio Member
 
Join Date: Jul 2004
Location: Finland
Quote:
Originally Posted by askbojesen View Post
- External PSU (When doing field recordings)
I made a cable to tap power from USB. USB is only 500 mA, but it works great on my thinkpad T40.
  Reply With Quote
Old 23rd September 2009, 09:34 PM   #420
diyAudio Member
 
Join Date: Sep 2008
Thanks! I appreciate the mini-review.
The spec that stands out is 192kHz with 2ch in + 2ch out at the same time. Most only managed 48kHz if even that.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Measuring Frequency Response MCPete Multi-Way 10 10th February 2009 01:36 AM
Measuring Frequency Response furly Planars & Exotics 1 17th March 2006 07:59 AM
Measuring the frequency response of a mic? mr_push_pull Multi-Way 5 30th August 2004 01:26 PM


New To Site? Need Help?

All times are GMT. The time now is 08:36 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2