[music-dsp] Is beating the same thing as flanging?

Victor Lazzarini Victor.Lazzarini at nuim.ie
Sun Nov 14 17:29:02 EST 2010

This is a simple flanger

y(n) = x(n) + C*y(n-D)

with D variable/modulated. The only difference is that the delay is  
longer (and variable).

A digital equalizer is based on delays alright, as any digital filter.  
So to be fair, it's delay-based processing.
Delay-based is just what the term says, based on delays. And all of  
what you might call delay-based
processes are also filters.


On 14 Nov 2010, at 22:19, Peter Schoffhauzer wrote:

> Victor Lazzarini wrote:
>> But a flanger is also not a delay. It's a (variable-delay) comb  
>> filter.
> True, but the flanger is based on a delay, and a phaser is based on  
> an allpass filter, not on a delay.
> And in the digital implementation (not in the analog one), that  
> filter is further based on a delay. But to say the phaser is based  
> on delays is like saying "an equalizer is based on delays", because  
> the filters of a digital equalizer have internal sample delays in  
> it. But does this also make an analog equalizer a 'delay-based  
> effect' with the same logic?
> And if I remember correctly, equalizers are not considered part of  
> the traditional class of 'delay-based effects'... So I guess  
> something is wrong with this logic.
> Peter
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