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Earplug View Drop Down
Old Croc
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Joined: 03 January 2012
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Points: 7752 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Earplug Quote  Post ReplyReply Direct Link To This Post Posted: 30 January 2012 at 10:35am
Originally posted by audiomik audiomik wrote:

For those still interested, have a look at 'FIR Filtering' - you'll need to be fairly good at Maths to understand fully how they work though - as they don't use 'algorithms' to simulate 'real life components'.
http://en.wikipedia.org/wiki/Finite_impulse_response as a start?
There is a comment included which relates to their Linear Phase and use in crossovers......
Mik


Ok, interesting, but the audio signal still has to go through 'real life' processing and filtering within the unit. I´d still like to see photos of a FIR filter response to a square wave!

Mine: active HP filter, 1k5Hz crossover point:

1) Upper trace = i/p, (200Hz). Lower trace = o/p, ie almost 0V, as expected:



Now square:




At 2k5Hz:






Anyone got the time to post photos of their digital xover response?













Edited by Earplug - 30 January 2012 at 10:36am
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norty303 View Drop Down
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Points: 8800 		Post Options Post Options   Thanks (0) Thanks(0)   Quote norty303 Quote  Post ReplyReply Direct Link To This Post Posted: 30 January 2012 at 12:22pm
I think this is very interesting stuff, and quite eye opening as to what's going on.
I'm still not convinced its a problem at reasonable levels though, although happy to adjust my thinking...

I think it should be put somewhere more obvious, as I suspect its of interest to a lot of people who may not bother to read a thread about DJ mixers
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Tarkovsky View Drop Down
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Points: 507 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tarkovsky Quote  Post ReplyReply Direct Link To This Post Posted: 30 January 2012 at 12:41pm
Agreed on every count!

This is also a damned good excuse for me to by that formula sound mixer as opposed to a shitty djm-800!
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audiomik View Drop Down
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Joined: 06 April 2010
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Points: 2956 		Post Options Post Options   Thanks (0) Thanks(0)   Quote audiomik Quote  Post ReplyReply Direct Link To This Post Posted: 04 February 2012 at 8:11am
Originally posted by norty303 norty303 wrote:

I think this is very interesting stuff, and quite eye opening as to what's going on.
I'm still not convinced its a problem at reasonable levels though, although happy to adjust my thinking...

I think it should be put somewhere more obvious, as I suspect its of interest to a lot of people who may not bother to read a thread about DJ mixers


So far we've looked only at single sine-waves; with a normal program source there will be a number of different frequencies present concurrently and intermodulation distortion products are produced which are additional to distortion harmonics caused by clipping a sinewave.

Agree with Norty that a separate dedicated thread would be good to look at all of this in more detail...... so am starting one titled: "Signal chain overload effects" in the Electro Frying Section.

Mik


Edited by audiomik - 04 February 2012 at 8:27am
Warning! May contain Nuts
plus springs, washers, screws, etc, etc.
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brooa View Drop Down
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Points: 162 		Post Options Post Options   Thanks (0) Thanks(0)   Quote brooa Quote  Post ReplyReply Direct Link To This Post Posted: 04 February 2012 at 9:00am
the 2 simple ways i solve dj's pushing to hard, 

1. baseball bat
2. 3 chance rule. if they push to hard 3 times turn off the system. works 100% of the time. you only have to turn it off once for word to get round

Edited by brooa - 04 February 2012 at 9:00am
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