Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Digital Line Level DACs, Digital Crossovers, Equalizers, etc.

Q about Signal Processing
Q about Signal Processing
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
Thread Tools Search this Thread
Old 8th February 2010, 12:13 AM   #1
Borat is offline Borat  United States
Join Date: Aug 2009
Location: Silicon Valley & NYC
Default Q about Signal Processing

imagine a FIR processor where the impulse response consists of just two impulses with the second one time delayed and inverted. it should produce a comb filter of sorts with the first null at DC.

now lets say i want to claim intellectual property rights for this filter for a certain application. but other guys are already using equalizers to deal with the same problem. if they wanted to steal my idea all they would have to do is to calculate the required frequency response and then design an EQ for it which would end up having the same impulse response that i specified. then they'd be able to claim they didn't use my idea but merely made an EQ which they had been using before.

question is. starting from that comb filter frequency response would they actually be able to arrive at the two impulses by any standard algorithm ? or are there many possible impulse responses which would produce the same frequency response ? i can only think of one other.

in other words i can't claim any rights to the frequency response as this is something they're already working on. but a more direct way of dealing with the problem is to produce a delayed and inverted signal. and i am asking whether a delayed and inverted signal is in fact exactly the same as an equalizer realizing the same response or is it somehow different ?

makes sense ?

HELP ! ! !

Last edited by Borat; 8th February 2010 at 12:18 AM.
  Reply With Quote
Old 8th February 2010, 10:39 PM   #2
dmills is online now dmills  United Kingdom
diyAudio Member
Join Date: Aug 2008
Location: High Wycombe
Considering that a fairly standard way to produce a comb filter is exactly that, delay and sum....

You can trivially go from an impulse response (which is essentially time domain) to a frequency response or vice versa by simply taking a Fourier transform of the impulse response to get the frequency response or vice versa to get from a frequency response to the corresponding impulse.

Sorry, I don't see any reasonably protect-able IP in that filter, possibly in your bigger application, but that approach to a comb filter is well known and well documented.

Incidentally, if you are trying to correct speaker time domain behaviour, Larvy has some interesting notes as to why it does not in general work in one of his presentations.

Regards, Dan.
  Reply With Quote
Old 8th February 2010, 10:49 PM   #3
Borat is offline Borat  United States
Join Date: Aug 2009
Location: Silicon Valley & NYC
All right screw it

  Reply to this post


Q about Signal ProcessingHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Sony sound processing.... ThSpeakerDude88 Car Audio 2 29th January 2010 06:14 PM
FIR processing for BASS possible ? Borat Digital Line Level 3 14th December 2009 07:19 PM
Audio processing chips jmar Chip Amps 0 4th February 2006 06:52 PM
Processing delays at Chipamp.com Maurice Chip Amps 2 2nd November 2004 01:00 PM
Input Signal Processing (or whatever you call it) Damedged2002 Solid State 5 25th August 2003 07:08 AM

New To Site? Need Help?

All times are GMT. The time now is 08:32 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio