i want to play maybe 50 or 500 audiobooks simultaneously…maybe faster, too. what are the REAL limits
Ha! You can mix as many as you want but it’s hard enough to listen to two people talking at once! Sometimes it’s hard to listen to one person and to catch every word they are saying…
If anyone has comments on fitting as much sound into a std. 3.5mm audio cable, please let me know.
It can basically handle anything you can hear and your speakers or headphones can play it. Regular music usually has multiple simultaneous instruments and vocals at the same time. An orchestra has about 100 instruments and you can hear then all at once and record them all at once or you can record them one at a time, or each with a separate microphone and mix them. Some rock recordings may have 100 tracks (normally mixed-down to stereo) but that would be on the high-side. Of course the more instruments you have, the more difficult it is to pick one out of the recording, especially when you have several violins playing along with other similar stringed instruments, etc.
If you open multiple tracks in Audacity, they will be mixed when you play or export. But, note that mixing is done by summation so you’ll have to reduce the levels to prevent clipping (distortion) in the mix. Audacity’s mixer has level controls for each track but no master control. Hardware audio mixers have a level control for each input plus a master level control so many tracks/inputs are easier to handle. DAW software also has a master control.
It’s carrier is 37.5kHz and one (with electrodes) can hear audio in the middle of their head, naturally, with ears plugged
Normal audio (the normal hearing range) goes up to about 20kHz so a regular soundcard may not go to 37kHz and you may loose the carrier.
Also, digital is limited to half of the sample rate. i.e. The sample rate for CDs is 44.1kHz which means the audio can’t exceed 22,050Hz. And there is normally a “smoothing filter” so it doesn’t usually that high but it usually does reach 20kHz. So, 96kHz would be the lowest standard sample rate if you want to keep the carrier. But since soundcards are intended for audio, the signal still MIGHT not go over about 20kHz.
With my Neurophone project to “download” books fast into my brain,
i decided to quit my attempts to make it “instant” and use my free time instead.
When it goes into my LONG-TERM memory automatically AND
i don’t have to consciously listen, it is already very good and OK.
Guesstimating a book at 8 hours total, at 4x playback speed
(maximum audible speed to be able to hear same book faster),
limiting it to 1 book at-a-time, leaves me at 2 hrs per day of device usage.
After a year i would be through 300+ classics i consider essential.
They can also be played back effectively at night, like a speaker-pillow…
The “Instant Download” project is one for actual scientists and military equipment.
i was wondering though, when the device enables ultrasound to be heard (or similar), theoretically, could there be a separating barrier for each audio track (book)
in the ultrasonic range, i.e. book 1 up to 20kHz, book 2 up to 40kHz, book 5 100kHz etc.
Or are there mutilations in sound that come along with these frequency changes?
The sound card thing i could not know before,you saved me some trouble…Thanks!
i’m better off studying the science of 432Hz tuning and music. This is…well, max, level stuff.
It would be the grail of a human existence were it true and usable as a download like that.
i have a simpler question this time:
i seem to have an observation from memory - around three (3) years ago, when i first tried this plugin.
it seemed to have this effect: the sound did NOT play through the speakers, but it DID through the Neurophone (it was heard).
i tried this again here-and-now (but with a Digital-analog-Converter, Fiio Q1 Mk2) and it did NOT work this way. do i remember correctly?
Could this be possible, if the Neurophone itself is Ultrasonic, and enables the body-brain to hear things in this range as well?
There ARE claims that it can do exactly this and it would be a plainly obvious example to give and simple enough experiment to try.
But i’m uncertain of my memory from the time and my verification of this phenomena similarily (i did NOT spend much time on it).
It was a desktop at the time as far as i know and now i’m all laptops. Any ideas on how or what would make it work as described?
Hi folks, I have an ultrasonic detector app that I know works because I can see it respond to noise at work at higher frequencies. I created a track in Audacity and applied the silent subliminal Nyquist script to the track, but when I play it back, the ultrasonic detector shows no response. I resampled the clip at 44,100 and used a carrier frequency of 17,500. This is the script I applied. Any thoughts? Does it matter what the format is of the IMPORTED audio clip before processing? Thanks in advance for any help.
;nyquist plug-in
;version 1
;type process
;name "Subliminal..."
;action "Subliminal..."
;control carrier "Carrier" real "Hz" 17500 14000 20000
(setf *nyquist-srate* (/ *sound-srate* 2.0))
(setf carrier (max 14000 (min carrier (- *nyquist-srate* 3000))))
;; We have two Nyquist frequencies, carrier/2 and *sound-srate*/2.
;; The CUTOFF is the maximum allowed frequency in the modulator.
;; It must not be greater than carrier/2, but also not greater than
;; the difference between the carrier and *sound-srate*/2, because
;; otherwise the modulated carrier aliases.
(setf cutoff (min (/ carrier 2.0) (- *nyquist-srate* carrier)))
(defun cut (function sound frequency)
(dotimes (ignore 10 sound)
(setf sound (funcall function sound frequency))))
(defun subliminal (sound)
(let ((result (mult 2 (cut #'lowpass8 (hp sound 80) cutoff)
(hzosc carrier))))
(cut #'highpass8 result carrier)))
(if (< *sound-srate* 44100)
;; (princ "The track sample frequency must be minimum 44100Hz.")
(princ "Die Samplefrequenz der Tonspur muss mindestens 44100Hz sein.")
(multichan-expand #'subliminal s))
Ultrasound is classified as above 20KHz. If you used that script with the carrier frequency of 17.5KHz. The output will be within 22KHz range, so majority of it will still be within normal sound range. Most speakers have a hard time going upto 20KHz, let alone 22KHz. Maybe the device you are playing the silent subliminal sound through is not capable of producing sounds above 20KHz. Therefore your app is not detecting it.
You should try playing the silent subliminal sound through hi-res earphones, and placing the mic of smartphone with ultrasound app near the hi-res earphones and then check if you are getting any output or not.
Yes, it is important what the format of the output file is, all MP3s will discard inaudible information. WAV file will retain this information. Before processing with the script format is not important as long as you are able to hear your utterances, after processing it has to be lossless format like WAV to retain that information.
Hi, I know this thread is pretty old already, but hope that I can still receive help with a problem regarding the Nyquist subliminal plugin posted here.
First off, I would like to apologize for any grammar mistakes or wrong vocabulary choices I’ll likely make, since English isn’t my first language and I am not that fluent in it. Furthermore I am also an absolute layman, when it comes to Audacity or audio stuff in general - so any technical terms are completely unknown to me. Please have patience with me. However, friendly corrections of any potential mistakes are of course very welcome.
Now that this is said and out of the way, back to my issues with the plugin…
I downloaded, installed and used it two years ago on my old laptop without any problems. But now I intended to use it on my new one, unfortunately with no success. Whenever I try to apply the effect nothing happens and a look into the debug menu of the plugin shows following error:
error: unbound function - MULTICHAN-EXPAND
This issue never occurred on my old laptop, therefore my uneducated guess would be that the new one utilizes a different sound system and accordingly I have to make some adjustments in Audacity. Both the Audacity version as well as the plugin are exactly the same I’ve used before. The driver used on the new laptop is also the same (Windows 10).
Can anyone here please help me to get the plugin working again? It would be highly appreciated.
Ha! You can mix as many as you want but it’s hard enough to listen to two people talking at once! Sometimes it’s hard to listen to one person and to catch every word they are saying… 