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

ISO 30Hz Square wave reproduction.
ISO 30Hz Square wave reproduction.
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 16th February 2019, 11:39 PM   #51
mark100 is offline mark100  United States
diyAudio Member
Join Date: Dec 2010
Originally Posted by cbdb View Post
Its a matter of phase. From Square Waves And DC Content: Deconstructing Complex Waveforms - Page 2 of 3 - ProSoundWeb

Seems everybodies right, sort of. A 200hz square thru a 50hz filter shifts the fundemental by 20 degrees which messes up the square. So it depends on the filter. A brick wall wont mess it up. Another reason a square is a great test signal. Just saw rayma has already addressed this.
Yes, I think we are all converging on the same thing....

Here's the thing in my mind...

In the analog world, to say phase matters is also to say frequency response matters....same thing...they are equivalent statements ....just depends on which one you want to make the causal factor.

In the digital world, we can separate phase and frequency response.

Which lets us see we have to double think the relationships we accepted as truth before.....such as conventional wisdom saying we need response below the fundamental to get good square waves.
And claims such as waves are this because of phase, or this because of mag.
We can dissect those claims now with digital.

After dissecting, I think the need to be flat below fundamental is/was simply due to analog implementation issues, particularly a residual in HPF effect or some other phase/response warp.

Bottom line for square waves afaict for both analog and digital, if mag and phase are flat from fundamental up, they'll be good and square.

As said by a number of us, likely means no HPF is bleeding in.
  Reply With Quote
Old 16th February 2019, 11:41 PM   #52
bentoronto is offline bentoronto  Canada
diyAudio Member
Join Date: Jan 2008
Location: Toronto and Delray Beach, FL
ISO 30Hz Square wave reproduction.
Originally Posted by scottjoplin View Post
I think this is where you confused yourself? It sounds like you are constructing a square wave from sine waves, in this instance nothing is needed below a 200Hz sine.
Yes, that sentence was wrong. My apologies to all.

But the way I put it in posts 27 and 33 was OK, I think.

HiFi aspirations since 1957. Currently working on motional feedback again... the final frontier in audio (also, see recent post with data on a 17-foot labyrinth sub)

Last edited by bentoronto; 16th February 2019 at 11:45 PM.
  Reply With Quote
Old 16th February 2019, 11:49 PM   #53
scottjoplin is offline scottjoplin  Wales
diyAudio Member
scottjoplin's Avatar
Join Date: Dec 2015
Location: Penrhyndeudraeth
Originally Posted by bentoronto View Post
But the way I put it in posts 27 and 33 was OK, I think.
Yes, I think maybe some of the responses didn't take into account you were talking about putting the wave through a band-passed system.

BTW, I'm finding it increasingly difficult to refer to it as a square "wave"
Woofer Assisted Wideband is the New Testament renounce the anachronistic acronym FAST

Last edited by scottjoplin; 16th February 2019 at 11:54 PM.
  Reply With Quote
Old 16th February 2019, 11:56 PM   #54
mark100 is offline mark100  United States
diyAudio Member
Join Date: Dec 2010
Hey Ben, way cool, thank you sir....
  Reply With Quote


ISO 30Hz Square wave reproduction.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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Linn Lingo vs. Dr. Fuß or Square-Wave vs. Sine Wave Oscillator for Motor Control tiefbassuebertr Analogue Source 68 22nd February 2019 05:43 PM
Listening Question: Would a high frequency square wave sound the same as a sine wave? jlny Everything Else 21 14th September 2018 04:46 PM
Sine wave - Square & Triangle wave generator using Transistors / OP-Amps lineup Solid State 20 9th October 2006 12:15 AM

New To Site? Need Help?

All times are GMT. The time now is 12:58 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio