How to make silent subliminal audio files

Audacity Help Forum Windows
1

I did some research to look for the method to make silent subliminal audio files but none of the methods work for me.

I got two codes for Nyquist Prompt and I tried both. After exporting the audio, I found the voice was still audible without any change.

One code is as follows.

(highpass8(highpass8(highpass8(highpass8(mult track (hzosc 15500))15500)15500)15500)15500)

The other code is as follows.

(highpass8
(lowpass8
(mult
(lowpass8 (highpass8 s 300) 7000)
(hzosc 45000)
(hzosc 59500))
20000)
14000)

Can anyone help? Thanks!

2

This works in all recent versions of Audacity:

;version 4

(highpass8
  (highpass8
    (highpass8
      (highpass8
        (mult *track* (hzosc 15500))
        15500)
      15500)
    15500)
  15500)