Silent Subliminals [solved?]

Programming and Development New Plug-Ins
101

Instructions for installing Nyquist plug-in for Mac: https://manual.audacityteam.org/man/installing_effect_generator_and_analyzer_plug_ins_on_mac_os_x.html#nyquist_install

I would strongly recommend using the “Nyquist Plug-in Installer” rather than installing manually.
Don’t forget to enable the plug-in in the Plug-in manager after installation.

102

Hello,
Could you please explain me what you mean by ‘‘we would still not be able to make any sense of it because it is encoded - it would sound like an raspy whistle and nothing at all like a human voice.’’ I thought if we would be able to hear 15500 hz we could hear the sentences as they were recorded. I’ve read the entire thread but I don’t see an explaination of lowery’s patent, like what exactly did he do? How did he encode the recordings and what was the purpose of it? I’d be very thankful if someone could shed some light on this.

103

So called “silent subliminals”, are generally created through “amplitude modulation” with a high frequency carrier wave.
O. M. Lowery’s patent describes this as “single sideband, suppressed carrier, amplitude modulated (AM) signal at 14,500 Hz.”

As sounds at this frequency are barely audible, I have created a lower frequency example so you can hear what it would sound like, if you could clearly hear such high frequencies - this sample uses the same encoding method, but with a carrier frequency of 8 kHz so that it is more clearly audible:

104

Thank you very much for the information! Do you know which carrier frequency he uses? Also why do you think he uses this barely audible frequency? I’d assume he also tried it with an 8 kHz carrier frequency and found his one to be working better, but why? Sadly I don’t have much knowledge about this matter.

105

According to the patent (link in previous post), 14.5 kHz (14500 Hz).


Because he’s attempting to create “Subliminal Stimuli”

106

Hi all.
Is there a way to extract the subliminal track from an audio?

107

See: Silent Subliminals [solved?] - #14 by edgar-rft

108

Hello !

Can someone, please, describe step by step how to install and use the subliminal file ?

I saw some contradictory things on youtube about this. Somebody uses only the plugin with the subliminal.ny and somebody uses the Nyquist Prompt to load the subliminal text file with the subliminal-rft.ny (stating that it had to research to find out that this is the right way)…

Also, which one of the subliminal files, is “better” : subliminal-rft.ny uploaded by Steve or subliminal.ny uploaded by Edgar-rft ?

Thank you !

109

When referring to specific forum posts, including posts that have plug-ins attached, please include a link to the post.
You can copy a direct link to the post by right clicking on the little grey icon next to the person’s name in the top left corner of the post:
link.png

110

Hi, ok, here it is.

a) “… somebody uses the Nyquist Prompt to load the subliminal text file with the subliminal-rft.ny (stating that it had to research to find out that this is the right way)…” → This part in regard to this post : https://forum.audacityteam.org/t/silent-subliminals-solved/20100/3

“Somebody uses only the plugin with the subliminal.ny” → This part in regard to this post : https://forum.audacityteam.org/t/silent-subliminals-solved/20100/7

b) Also, i just read that you recommend saving as .wav file a subliminal track. Is that the default .wav setting : Encoding - Signed 16 bit PCM ?

c) Could you, in short, explain why the track frequency has to be 44100 Hz(or more then double the carrier frequency) in the case of subliminal tracks : to have " room " for the speech part ?

Thank you very much !!

111

I assume that you are referring to the plug-in that I posted here: Silent Subliminals [solved?] - #3 by steve
and the code that Edgar-rft posted here: Silent Subliminals [solved?]

The plug-in that I posted contains the same code as was posted by Edgar.
The difference is that Edgar’s post has to be copied into the Nyquist Prompt (Nyquist Prompt - Audacity Manual) every time you want to use it, whereas I posted a plug-in that can be installed. When installed and enabled, it will be available in the bottom section of the Effect menu.

Installation instructions for Nyquist plug-ins are here: Installing Nyquist Plug-ins

112

Yes, 16-bit WAV will be fine.


The way that “PCM” digital audio works:

  • The audio waveform is represented by a sequence of numeric values, called “samples”.
  • The number of samples per second is the “sample rate”.
  • The maximum frequency that can be represented by the digital audio is half of the sample rate. This is known as the “Nyquist frequency”

The “silent subliminal” encoded audio has frequencies around the “carrier frequency”, so the sample rate must be more than double the carrier frequency.

See also: Digital Audio Fundamentals - Audacity Manual

113

Thank you very much for your answers !
You understood me correctly about all the points mentioned !

I also read and acknowledged the post where you wrote about having set the Project Rate to 44100 Hz or the track will not be exported to this frequency despite the resampling !

Thank you again and have a great day !

114

Hello Steve. I tried the subliminal.rft.ny file from 2011 and it works. On my laptop speakers I hear my affs slightly but they’re inaudible and I guess that’s how it’s supposed to sound. On my earphones I hear a whistling sound, is that an issue?
Also I’ve seen you post another code for silent subs in another thread, is that one better?

115

Also I’ve seen you post another code for silent subs in another thread, is that one better?

I think you’ll have to ask a psychic or just try for yourself. Most of us here are technical-types and most of us are concerned with what we CAN hear! :wink:

Personally, I’m immune to subliminals. :stuck_out_tongue: But I think it’s more fun if the subliminal can be exposed or decoded…

116

Has anyone here done any “blind tests” among yourselves to see if this actually works?

You can’t really determine if a subliminal worked or not if you are fully aware of the desired effect its supposed to induce (because then it will likely just be a placebo effect).

117

Most of us here are technical-types and most of us are concerned with what we CAN hear!

I’m fond of processes you can reverse and test. Where is the testing software that can get the goal message back in a clear form?

And yes, I’m also fond of processes that follow good engineering practices. From whatever you chose as a carrier frequency, the system has to pass all the tones in the message both up and down. For example, in the case of 15592Hz, telephone quality sound (3000Hz) is going to produce tones between 12592Hz and 18592Hz. That’s conventional AM. and yes, if you leave the 15592Hz carrier in there, some people are going to be able to hear it. This is where your test subject needs to be young girls. If the carrier is audible and annoying to them, then it’s not subliminal any more.

Nobody mentioned restrictions on the main show. The main show (the liminal one) can’t produce tones that interfere with the subliminal work. In the above example, the main show probably should not have tones higher pitch than about 10,000Hz which sounds like muffled FM Radio.

I don’t buy Single Sideband or Single Sideband Suppressed Carrier or even Double Sideband Suppressed Carrier. Without a decoder or other demodulation processing, those just produce trash.

At least once in there should be the admonition to avoid MP3. MP3 gets its small files in part by eliminating subliminal sounds.

And that loops us back to: “Where is the testing software?”

Koz

118

I’m sure most people’s subconscious mind will not be able to demodulate an AM signal, then what other modulations can be applied to make it understandable to subconscious mind like normal sounds are audible to conscious mind, what modulation or encoding is used for audible sounds in wav format, can’t the silent subliminal be encoded in that format? Is there a way to make silent subliminal without any modulation?

Can you tell us if they informed you what the commercial recording contained. Any word, etc, can users get a sample of it in the format they sent you in, is it in English?

119

Is there a way to make silent subliminal without any modulation?

I don’t know if it’s considered “silent” but the easiest way is to mix a low-level sound (-20dB or more) with a louder sound (Music, pink noise, white noise, etc.) so the quieter sound is masked (drowned-out) by the louder sound.

If you do it “carefully” the louder sound can be subtracted-out later to reveal the “secret message”.

then what other modulations can be applied to make it understandable to subconscious mind like normal sounds are audible to conscious mind, what modulation or encoding is used…

You’d have to ask someone who believes in this stuff… I’m immune to subliminal messages! :stuck_out_tongue:

for audible sounds in wav format, can’t the silent subliminal be encoded in that format? Is there a way to make silent subliminal without any modulation?

WAV is probably the best because it’s lossless. Lossy formats like MP3 make the file smaller by throwing-away things you can’t hear. Some “hidden” information might remain or it might not or it may remain but be “damaged”.

120

Hi All,
1). Are subliminal-rft.ny or subliminal.ny plugin from 2011 still works with newest Audacity 3.1.2 version?
2). Does subliminal signal back to speech again codes (shown as below), still works with newest Audacity 3.1.2 version?

(defun demod (s-in cf)
(mult s-in (hzosc cf)))

(multichan-expand #'demod s 17500)

Thank You!