Silent subliminal in one ear and the information discarded in that process in another ear

I want to do experiments with silent subliminal. So let’s say I use the silent subliminal script on an audio, it’ll occupy some 3000Hz above and below the chosen frequency. I pan this to one left channel.

In the process of transforming an audio into silent subliminal, 14000Hz information is discarded, is there a way to obtain this discarded information, I want to use this discarded content and pan it to the right channel. Then I want to try playing both at once to see if it has any effect.

Another idea is, since the silent subliminal retains the amplitude of the audio, is there a way to retain the frequency of the audio, I would use one in left ear and another in right ear.

Ummmm. No. The current code doesn’t work like that. It’s suppressed carrier, single sideband. That’s the only way you can make it fit up there.

I can’t get the forum software to pass the Nyquist code without messing it up. This is me looking for another method.

We did not use the current published code.


SiSub-Encoder.txt (487 Bytes)
SiSub-Decoder.txt (71 Bytes)

I hope the forum leaves the files alone.

I made the message from simple, good quality mono sound at 44100, 16-bit. At the other end, I expected and got my message at clear but telephone quality. Remember telephones?

In the middle is a very nearly completely silent track with the encoded energy up where only dogs can hear it.


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It seemed to work. You need to copy/paste the actual code from those two messages into the Audacity Tools > Nyquist Prompt.


Do you have an actual goal? It rings bells when someone tells us they only just want to “fool around a little.”

The forum frowns on people doing things questionable, harmful, or illegal.

You giving up smoking?


I have actual goal of improving myself through hypnosis and affirmations. I’m coming up with ideas and experiments to find an effective way to make subliminal. I don’t have smoking problem. I’ll try your code and get back to you.

To be clear, it’s not my code. It’s SteveTF’s code. He’s the developer/programmer. I’m the broadcast engineer who knows what Single Sideband is.

Also, I’m the one who insists on being able to reverse the message back to clear voice to keep the process, or at least our part of it, from becoming “magic.”


If you discover a differet process, do post back.


I’m copying the code from the text file and pasting it in nyquist prompt and clicking OK, but nothing is happening.

You copied just the code and not my notes at the top?

Screen Shot 2023-04-19 at 10.22.32 AM

Which Audacity do you have?

You should have a plain speech message on the timeline and it should be selected.

The message should be Mono, 44100Hz, 16-bit PCM.

Do you get any errors?

There is one odd test you can do. Briefly listen to your message. Do the conversion and try to listen to it again. It should be silent even though there are blue waves on the timeline.


I have Audacity 2.3.2.

It is a plain speech without any sounds, it is fully selected.

Originally it was a stereo file, but I converted it to mono and saved it with sample rate of 44100Hz and 16-bit PCM (WAV) file.

I’m not getting errors and it sounds exactly as it did before the conversion.

Update: Unchecking the “use legacy version syntax” has made it work.

After using the script, when I do spectrum analysis, there is a gap near 16KHz. You can see this in the screenshot. Is the gap supposed to be there?

I’ve also attached the output from spectrum analysis as text file.

spectrum.txt (12.1 KB)

You should probably use higher resolution display (attached).

Resolution-Screen Shot 2023-04-22 at 1.58.20 PM

If you’re using the SSB, Suppressed Carrier method called in our postings, then that “hole” is where the carrier was, at 16000 Hz.

In short, that’s normal.

You can also boost the display by dragging the right-hand side of the plot to the right, then click on the top and drag the whole thing to the left-off the screen. Repeat. The section at the right of the sweep will get larger and easier to see.

For reference, bass notes are just to the right of 16000Hz, and the message goes up in pitch until you hit the highest pitch notes around 20000Hz. That’s the limit of most soundcards, speakers, and headphones. Any sound higher pitch than that—“real sound” or sidebands—is lost.

The goal is to snuggle all the audible tones in your affirmation speech between those two points. You can’t hear that high a pitch. That’s what makes it Silent Subliminal.

If you used one of the other subliminal techniques, you’re on your own.


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I’m not sure this is going to help, but in normal broadcasting, the right-hand purple blob would be mirror-imaged on the left and the hole would be filled with the broadcast radio transmitter carrier at 880KHz, 1040KHz or whichever AM radio station you’re listening to.


That’s what got my attention about this process. It follows normal engineering practices, and you can reverse it back to clear speech with the supplied decoder.

Whether or not the affirmation works is up to you. Have you decided what the message is going to be?


It’s impossible to post on this thread without the Stuart Smalley character coming to mind. Do you know who that is?


:smiley: :smiley: :smiley: I’ve been thinking the same thing! :smiley: :smiley: :smiley:

But I didn’t remember the “Stuart Smalley” name and I didn’t remember the exact catchphrase/mantra. But it’s on YouTube (of course).


No, I didn’t know about that SNL character. We don’t get SNL here and it’s from 1990s.

But you Googled it, right?