All kinds of filters out a processor (apex intelli-x and in the future some other processors)   Leave a comment

So first a link to a article written by Bennett Prescott :

20-fea…ted-equal.html

This post will be updated when ever i get the chance to do measurements on whatever processor i come across and i have time left to do them .

So because of the article i thought it would be nice to measure the outputs of different processors i run in to doing the job . Within my company I have the APEX intelli-x and BSS BLU80 processors so they are the first units i will be measuring.  

So first : Bessel low-pass filters @ 1kHz different filter orders on the APEX .

Second : Bessel high-pass filters @ 1kHz different filter orders on the APEX  .

Third Linkwitz-Riley high&low-pass filters on the APEX .

Fourth Butterworth low-pass filters on the APEX .

Fifth Butterworth high-pass filters on the APEX .

As soon as possible i will do more measurements on both the apex and the bss BLU80 .

So here’s the first update . I compared the BSS blu80 and the APEX intelli-x . Most of the high and low pass filters matched but the BESSEL filters didn’t .

First i matched the output signal of both units in amplitude and synchronized the compensation delay . The first difference between both units is the latency wich on the BSS BLU80 (red trace/FFT2) is 2.10ms and on the APEX intelli-x (purple trace/FFT3) is 2.81ms . The phase difference in the high end has to do with the sample rate of both units . The APEX is @96kHz and the BLU80 is @48kHz .

bessel 2 hp bss red apex purple

BSS BLU80 Bessel 12db/oct high-pass (red trace) vs APEX Intelli-x Bessel 12db/oct high-pass (purple trace).

bessel 2 lp bss red apex purple

BSS BLU80 Bessel 12db/oct low-pass (red trace) vs APEX Intelli-x Bessel 12db/oct low-pass (purple trace).

bessel 4 hp bss red apex purple

BSS BLU80 Bessel 24db/oct high-pass (red trace) vs APEX Intelli-x Bessel 24db/oct high-pass (purple trace).

bessel 4 lp bss red apex purple

BSS BLU80 Bessel 24db/oct low-pass (red trace) vs APEX Intelli-x Bessel 24db/oct low-pass (purple trace).

Within the BSS BLU 80 there is a filter that’s not available in the apex but has a rather interesting phase behaviour . The NTM filter . So no comparison but just single screenshots .

BSS NTM 36db oct hP  BSS NTM filter 36db/oct high-pass .

BSS NTM 36db oct LP  BSS NTM filter 36db/oct low-pass .

BSS NTM 52db oct hP  BSS NTM filter 52db/oct high-pass .

BSS NTM 52db oct LP  BSS NTM filter 52db/oct low-pass .

 

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