Voltage cotrol Allpass filter, Phase rotation,
I got this stuck in my head,
I look for a build a box that Rotate the Phase of one channel with a 2nd
So the waveform are the same?
ie, like the Kick and the bass, but do with Phase rotation and not by time delay
any dear for a build.
1 Like
I found this document:
http://www.soundsemiconductor.com/downloads/AN701.pdf
An all-pass filter, better known as phase-shifter, is the output of a high-pass filter subtracted from a low-pass one. Figure 9 shows a single-pole all-pass stage. It’s exactly the same as the HPF circuit of figure 6, except R4 is halved, so that the low-pass output is added to the
inverted high-pass output. This is the same as subtracting the high-pass from the low-pass. This one is non-inverting.
If you look at the Bode plot, it does 180° reversal at high frequency and 0° at low frequency. I suppose if the last stage were changed to non inverting it would do the opposite.
Design uses an SSI2164 chip which goes for about $7 in a SOIC package. But maybe the idea of modifying a HPF design is applicable to other schematics.
Reading your post again, maybe you’re asking about voltage control of the phase? Hmm.
1 Like
