Equal Loudness Contour filter with MiniDSP. Can be done? - Page 2 - diyAudio
Go Back   Home > Forums > Commercial Sector > Manufacturers > miniDSP

miniDSP Low cost, modular Digital Signal Processor (DSP) kits for the DIYer from miniDSP.

Reply
 
Thread Tools Search this Thread
Old 3rd December 2010, 01:41 AM   #11
minidsp is offline minidsp  Hong Kong
diyAudio Member
 
minidsp's Avatar
 
Join Date: Dec 2009
To all,

Sorry for the late reply.. We weren't ignoring all the good comments and ideas being shared. Just been very busy, that's all! :-)

The idea is indeed very good. With miniDSP, we indeed have the ability to implement a simple Loudness control using the well known Fletcher and Munson curves.

Not much work apart from programming the features, adding and toggle for the external control potentiometer (from volume to loudness). Then adding some controls in the UI for selecting the high and low freq.

A good idea that we'll try to implement in the future.

DevTeam.
__________________
www.minidsp.com - Low cost & modular audio DSP kits for DIYers - Follow our tweets @ minidsp
  Reply With Quote
Old 23rd March 2011, 05:41 AM   #12
diyAudio Member
 
Join Date: Sep 2004
Location: Brooklyn,NY
Hello minidsp,
I just wanted to jump on and voice my opinion as well since you said you wanted to see how many people actually desire this feature.
I am personally very much interested to see this feature implemented.

THANK YOU for all your hard work, efforts and most of all staying in contact with the user base and listening to the suggestions.
Best of Luck!!!
  Reply With Quote
Old 20th May 2011, 08:52 PM   #13
diyAudio Member
 
Join Date: Sep 2010
+1 on implementing a loudness at different gain levels function with Fletcher and Munson!!! This would really take the MiniDSP to the next level for an already great product.

Waiting for the update......

Thanks in advance MiniDSP team!
  Reply With Quote
Old 21st May 2011, 05:49 AM   #14
VK6FUN is offline VK6FUN  Australia
diyAudio Member
 
Join Date: May 2011
Location: north baandee
I am interested in the possibility of using the miniDSP as a cheap hearing aid so i'm trying to follow this closely.

My theory is that CIC (completely in canal) hearing aids cost thousands and this expense is not even half-covered by health insurance companies therefore discriminating against the half-deaf (like me).

I would be quite happy to settle for CUH (completely under hat) or CITP (completely in top pocket) if i could simply build and tune it myself for a few hundred bux!

Your comments are keenly sought

cheers

pete vk6fun
  Reply With Quote
Old 23rd May 2011, 02:35 AM   #15
minidsp is offline minidsp  Hong Kong
diyAudio Member
 
minidsp's Avatar
 
Join Date: Dec 2009
@ IBM5150

We indeed still hope to be able to implement this feature in an upcoming plug-in.. Things have just been a busy on the release of our new platforms. It's always a juggle of time between Hardware dev and Software (plug-in) dev for our team. We'll let you know what comes out.

DevTeam
__________________
www.minidsp.com - Low cost & modular audio DSP kits for DIYers - Follow our tweets @ minidsp
  Reply With Quote
Old 23rd May 2011, 02:43 AM   #16
minidsp is offline minidsp  Hong Kong
diyAudio Member
 
minidsp's Avatar
 
Join Date: Dec 2009
@ Pete,

Well miniDSP for a hearing aid would be a first but we're always happy to help especially if we can help you save some bucks! :-)
With it's very low power requirements (150mA @ 5V), it could operate on a battery (e.g. 12V) but I don't think that it would be considered as a "low power device" with this said.. You might have to figure out the battery requirements (online calculators)

With this said, we don't have much knowledge of the requirements of an hearing aid... what processing you'd need? What's the impedance of these in ear canal piece? You'd have to have a closer DIY look on your side since that's a bit "out of typical" knowledge.

Hope this helps

DevTeam
__________________
www.minidsp.com - Low cost & modular audio DSP kits for DIYers - Follow our tweets @ minidsp
  Reply With Quote
Old 23rd May 2011, 03:25 AM   #17
VK6FUN is offline VK6FUN  Australia
diyAudio Member
 
Join Date: May 2011
Location: north baandee
Hi thanx for getting back to me.

I intend to start experimenting with cheap hardware so we're talking about driving a pair of reasonably good quality earplugs.

for input it would just be two electrets.

most of us fifty-something year olds start losing frequency response in a ski slope from -2dB @ 80Hz up to -50dB @4kHz. often there is a deep valley around 1.5-2kHz so all sensitivity to sibillance is lost.f sounds like sh
etc. deep bass sounds become extremely annoying and overwhelming.

hearing aid salesmen ("audiologists") will provide usually free of charge an audiogram which is basically a settings chart for a graphic equaliser.

tuning out different background interference is where it really starts to get interesting.

it should be possible to fool around with different audio parameters and tune such a setup for different environments etc. the miniDSP appears to be capable of such a task. Changing perceived loudness at different volume settings is what is known as "super hearing"

ideally i'd like to power it with a 7805 (ie NiMH) or 7809 (IE 9v transistor batt).

pete vk6fun
  Reply With Quote
Old 26th October 2012, 08:10 PM   #18
diyAudio Member
 
zakman35's Avatar
 
Join Date: Mar 2009
Location: Athens
+1 from me.

Great idea George.
__________________
Modesty is the art to make others discover how great you are.
  Reply With Quote
Old 6th December 2012, 11:14 PM   #19
diyAudio Member
 
Soldermizer's Avatar
 
Join Date: Feb 2012
Location: Tamper, FL, USA
A very late reply but an idea. A simple way to do what this might be as follows, but would require the MiniDSP remain connected to its PC: you would have two (or more) EQ curves for various desired listening levels. I already do something similar. I EQ by ear, 1/3 octave pink noise, so that each band SOUNDS the same to me. You could do this for (say) a 60 dB SPL and 100 dB, and the load the curves as needed. Like many custom ideas this is good because it would be 100% tailored to your unique system/ears; it's simpler; it's "off the shelf." It is worse because it requires more wires and fiddling, but hey, that is the DIY part of the hobby.
  Reply With Quote
Old 4th August 2013, 10:10 AM   #20
gpapag is offline gpapag  Greece
diyAudio Member
 
gpapag's Avatar
 
Join Date: Nov 2002
Location: Athens-Greece
I still havn't seen any activity for implementing a sw Loudness compensation function tracking the Volume control.
From the data manual of another device http://www.ti.com/lit/ds/symlink/tas5548.pdf I quote the section that contains info for implementing such a function.
I hope that it can be of some help to DevTeam

George
Attached Images
File Type: jpg loud.jpg (488.7 KB, 118 views)
__________________
["Second Law is a bitch." - SY] ["The Road To Heaven:Specify the performance & accept the design. The Road To Hell:Specify the design & accept the performance"-Bruno Putzeys]
  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
First Speaker, trying to figure out a contour filter SState13 Full Range 7 9th September 2009 12:10 AM
contour/notch filter for Fe208e sigma? adamt Full Range 1 16th April 2009 02:15 PM
Preamp with Loudness compensation and Subsonic filter quicknick Solid State 7 7th April 2009 05:16 PM
Equal-Loudness-Curves / Fletcher-Munson / ISO 226 / etc. - WHY do we care? smellygas Multi-Way 29 25th February 2009 04:11 PM
Equal-Loudness Curves for low frequencies? Sjoerd v L Subwoofers 4 9th June 2005 10:22 PM


New To Site? Need Help?

All times are GMT. The time now is 11:36 PM.


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