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Marcus Tee's Blog
Topic: Can you identify this?
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fiogf49gjkf0d Does anyone know what language this is?
Listen Here
Marcus Tee
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Member Comments:
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fiogf49gjkf0d I found another software tool I can hardly wait to try. The Sonic Visualiser.
Free download and details are at www.sonicvisualiser.org/
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fiogf49gjkf0d Thanks Marcus Tee. Will try it out later.
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fiogf49gjkf0d Yeah, that's the link and if you get it and want to use the configuration I created, here it is. Just copy the text below and save it with notepad. be sure to change the extention to .rsc. And if ou want the cross fader I made, let me know.
## RolloSONIC Configuration (RSC) ##
[Module_AudioOsc]
Name=Oscillator module 1
Position=872,341
AmplitudeControl=Audio-Input module 1
AmplitudeControlSubType=0
AmplitudeControlSensitivity=1000
AmplitudeValue=500
FrequencyControl=-[Manual]-
FrequencyControlSubType=0
FrequencyControlSensitivity=100
BaseFrequencyValue=8.7
FrequencyMultiplierValue=131
NoiseControl=-[Manual]-
NoiseControlSubType=0
NoiseControlSensitivity=100
NoiseValue=0
WaveformControl=-[Manual]-
WaveformControlSubType=0
WaveformControlSensitivity=100
WaveformValue=0
RampControl=-[Manual]-
RampControlSubType=0
RampControlSensitivity=100
RampValue=0
PhaseControl=-[Manual]-
PhaseControlSubType=0
PhaseControlSensitivity=100
PhaseValue=0
StepSizeControl=-[Manual]-
StepSizeControlSubType=0
StepSizeControlSensitivity=100
StepSizeValue=0
OutputDeviceID=-1 (L)
[Module_AudioInput]
Name=Audio-Input module 1
Position=298,187
GainControl=-[Manual]-
GainControlSubType=0
GainControlSensitivity=100
GainValue=10
InputDeviceID=-1
[Module_AudioLowPass]
Name=Low-pass module 1
Position=578,251
MaxFreqControl=-[Manual]-
MaxFreqControlSubType=0
MaxFreqControlSensitivity=100
MaxFreqValue=100
OutputDeviceID=-1 (L+R)
InputModule=Audio-Input module 1
InputModuleSubType=0
Marcus Tee
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fiogf49gjkf0d Looks like something that might be fun to play with.... Do you have the URL where we can go to download a copy for ourselves?
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fiogf49gjkf0d Okay, it's time to come clean...
I was seaching the net for a vocoder and came across one that was absolutley free called RolloSonic. The neat thing about it is that it has many parts to it that can be freely configured together. After playing with it for a little while and looking at some of the configuration files that come with it, I tried to make a few of my own. What you heard in the the post above is one that I came up with. I am reading a paragraph out of a magazine. But you only got to hear one side of the stereo track.
Here I am reading Sick Puppy's first entry below and you can hear both stereo tracks:
"I'm sure I heard some English words in there.... Seems like more than one person/entity speaking."
And now here are three more files that represent one song (Streets of Laredo) that I played on the mouth harp. The first is normal, from one side of the stereo track.
The second is from the other side of the stereo track.
The third is both tracks together.
Pretty strange, eh?
Marcus Tee
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fiogf49gjkf0d Same here. Back in the 1980's was the decade for my radio days. Now its strictly computers for me. Don't have the time or space for all that big old analog equipment anymore.
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fiogf49gjkf0d I studied all that years ago, so I know exactly what you're talking about, although I'm 20+ years out of practice. I even went as far as designing and building antennas in my parents' attic, which were still in great working condition when they sold the old house about three years ago.
And then came computers, and I put the radios in storage.
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fiogf49gjkf0d What you are hearing is the result of frequency inversion.
This same effect can also be produced in a studio by a device known as a "Ring Modulator".
What is happening is that the input frequency (in this case voice) is used to amplitude modulate a fixed tone. (in this case, I estimate about 3 KHz) This produces and upper, and a lower sideband AM signal, with a carrier of 3 KHz. The lower sideband is always frequency inverted from the upper sideband - a mirror image.
Since voice covers frequencies of about 200 to 3000 Hz, and the lower side is mirror imaged, all of the tones around at 1500 Hz would still be heard at 1500 Hz, but tones at 2500 Hz would be down at 500 Hz. Tones at 200 Hz would now be heard at 2800 Hz. - an exact frequency inversion - totally unintelligible.
If you ran this signal back through the same process again, it would flip it back around, and be understandable again. Several obsolete "voice scramblers" for police two-ways used this exact scheme years ago to make it so people couldn't listen in on scanners.
Sorry about the long explanation, but I'm an engineer... I can't help it.
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fiogf49gjkf0d That's exactly what I meant.
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fiogf49gjkf0d "Too bad there isn't (as far as I know) any software based utility out there that behaves like a BFO to clean up the audio."
Like a beat frequency oscillator decoder?
Long time ago, there was a hardware circuit that did that. It had a LM567 chip to do the decoding. Maybe the schematic is somewhere on the net?
Eye suppose it can be done with software using a sound card that has a high enough sample rate.
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fiogf49gjkf0d So aliens use amateur radio bands then......
Now I'm going to have to drag my old radio out of moth-balls to test your theory. (I gave it up years ago because they used to require Morse Code, which I could never get the hang of.)
Too bad there isn't (as far as I know) any software based utility out there that behaves like a BFO to clean up the audio.
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fiogf49gjkf0d YES!
As a HAM radio operator, I can tell you that is the sound of a single-sideband voice transmission, as heard using the wrong mode on a shortwave receiver.
For instance, the guy you are hearing might have been using lower-SSB mode, and your tuner was set to upper-SSB mode.
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fiogf49gjkf0d I'm sure I heard some English words in there.... Seems like more than one person/entity speaking.
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