Lowry didn’t have digital filters at that time, so it was “easier” first to produce a SSB-modulated shortwave signal and then transform it down to the audio range, but the output signal is exactly the same. Wargan and Steve’s link to Lowry’s US-patent it was possible to “translate” the description of the original Lowry machine, that used two slightly de-tuned radio transmitters to produce the subliminal audio signal, into Nyquist code that saves the up/down frequency transformation. But at the same time this is another reason why it is very hard to decide if subliminal messages really work or are pure “placebo” effect mainly based on simple self-suggestion. This is another proof that it’s our own wishing or thinking that mainly influences our perception. In some subsequent discussions I prooved several times that the “ultrasonic” plugin with 44100Hz sample frequency only produced signals containing not more “message” than contained in dust-buster noise, but people were still continuing claiming “astonishing success” and similar nonsense, where the “subliminal” messages produced by the old “ultrasonic” plugin on standard 44100Hz soundcards contained nothing but pure audio garbage and no “message” at all. To me it was instantly clear that the “ultrasonic” plugin couldn’t work on a 44100Hz soundcard because the signals produced by the plugin were above 30000Hz, which cannot be reproduced with 44100Hz sample frequency. Some time later I was notified via some posts in the german Audacity forum that people reported success by using the “ultrasonic” plugin to produce subliminal messages. The dogs, who can hear ultrasonic sounds, then learned to do things according to the signals, where the humans hear nothing. They had a 192kHz soundcard playing ultrasonic “dog commands” over a piezo speaker system. There had been a predecessor “ultrasonic” plugin in the german Audacity forum, that had originally been written for a dog training school. Maybe subliminal messages can help me to think “good”, so I have nothing against subliminal messages, but I cannot promise that it really works.Ģ. Strictly spoken, I do not necessarily need subliminal messages to make me feel good, it’s mainly my own thinking that infuences my perception, often much more than I am really aware of this. The same effect can also work the other way around. If I get up early in the morning and think “everything is bad” then probably the whole day long everything will appear as “bad” to me, mainly because I make myself think that everything is bad, even if the day is good. I generally try to be unbiased in answering this question, but I think that it is mainly matters if you believe in subliminal messages or not.ġ. I cannot promise that the “Subliminal” plugin (or any other subliminal message machine) produces any useful result. I only translated the electrical description in Lowry’s patent paper into Nyquist code. The “RFT” in edgar-rft is the german abbreviation for audio/video recoding equipment electrician. I have been listening to the silent subliminal messages for two weeks now. Original under Silent Subliminals with Audacity - text is in German but nothing you do not already know… The maximum modulation depth is at a carrier frequency of “track-sample-frequency / 2 / sqare-root-of-two”: (princ "The track sample frequency must be minimum 44100Hz.") (let ((result (mult 2 (cut #'lowpass8 (hp sound 80) cutoff) (setf sound (funcall function sound frequency)))) otherwise the modulated carrier aliases. the difference between the carrier and *sound-srate*/2, because It must not be greater than carrier/2, but also not greater than The CUTOFF is the maximum allowed frequency in the modulator. We have two Nyquist frequencies, carrier/2 and *sound-srate*/2. I cannot find any aliasing or mirror frequencies with the Audacity “Analyse > Frequency Analysis” and everything looks pretty well. It works with a cheap 44.1kHz standard soundcard. I think I have a finally working Silent Subliminal plugin producing an SSB modulated carrier like the original Lowerey machine.
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