Flanger vs. phaser

Submitted by mic on Thu, 01/02/2020 - 15:09

I read a few articles about flangers vs. phase shifters and watched some videos. I found them unsatisfactory. It is hard to tell the difference. Many videos talk about more or less "whooshing", "bright", and "pronounced", but all of that means little to me and depends on the settings. Also, videos contradict each other.

Having designed flangers and phasers, I would say:


Multi threshold compressors

Submitted by mic on Mon, 11/26/2018 - 12:47

I am testing my compressors. I start with a simple frequency of 400 Hz over the sampling rate 8 kHz. I apply a volume envelope over this frequency. The envelope is simple.

  • The volume is zero over the first 400 samples (about 50 milliseconds).
  • It increases gradually (a straight-line increase) to 0.9 over the next 80 samples (10 ms).
  • It then decreases gradually to 0.4 over the next 1600 samples (200 ms).
  • It is sustained at 0.4 over the next 3200 samples (400 ms).
  • It decreases to zero over the next 4800 samples (600 ms).

Equalizing vocals

Submitted by mic on Wed, 08/22/2018 - 21:27

When equalizing vocals, much of the work involves removing offending frequencies. We do so by cutting out a narrow band of frequencies.

Typical recommendations are:

  • If there is too much low frequency rumble, cut down on frequencies below 80 Hz.
  • If the vocals are booming, look for an equalizer that can put a magnitude reducing notch with a middle frequency somewhere between 100 Hz and 300 Hz, dipping down to, say, -30 dB, and a width at -3 dB of probably about 100 Hz. You would have to experiment by moving the notch up and down the interval between 100 Hz and 300 Hz to find the offending frequency band.

Code for a sine sweep

Submitted by mic on Sat, 06/30/2018 - 21:52

I have been testing various sine sweeps for use in impulse reverbs. I thought it would be useful to show the Java code for creating a short wave file with a sine sweep. The code is simple, but also interesting. It is interesting not only because it creates a sine sweep, but also because it shows the structure of simple wave files. Beginner DSP designers, who want to create or read wave files, may find it useful.


Something not right with the vocals

Submitted by mic on Thu, 06/07/2018 - 11:28

Often, a song becomes stuck. Sometimes it is the arrangement. The song is boring, slow, or repetitive, or a hook is missing. Sometimes it is the mix. Perhaps the bottom end is hollow and unexciting. There is too much in the middle. Perhaps the mix is just a flat nothing going nowhere. Sometimes it is the song itself. Maybe the lyrics are corny. Or the melody has so much pop and march that it belongs only in a movie soundtrack – probably only in a western.



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