This guy is great. The truth of every breakthrough technology is that it has equal potential for good as well as evil. I don't quite grasp the mechanism of how he is using 100kHz to generate audio at less than 20kHz. Human hearing range is categorized between 20 Hz to 20kHz, although both ends of that spectrum are typically not able to be heard by the majority of people. Most human verbal communication is typically between around 400 Hz to 2700-3400 Hz. Higher and lower frequencies beyond this range are unusual in normal conversations and even singing. I was originally thinking this is a harmonic generator that produces harmonics that allow it to reproduce lower frequencies, but I don't think so. Whatever it is, all I can think of are positive uses, but that is merely how my brain works. I have to try to actually come up with offensive ideas, defensive ideas are more natural to me.
You may be close to the target, and this might help. If they're using higher frequencies we can't hear, but then the wave hits the skull/grey matter, would that possibly shift the frequency down to hearing level? Much like listening to a boat motor above water then hearing it under water differently?
I'm not terribly certain about the complexities and idiosyncrasies of audio frequencies. It is adjacent to my field of RF, but has not been a major focus. I need to start taking a closer look at audio frequencies to learn more about that range. My career is built in RF communications from HF-EHF, although EHF is not as regularly a part of my research and application because it requires such exclusive hardware to generate and measure.
"the wavelength of a sound wave would change as it experiences a change in medium. However, this does not mean that the pitch, which is related to the frequency, would change. In fact, it shouldn't change. In general, there will reflections of the wave upon a change of medium. Therefore, the 'loudness' which is related to the amplitude of the wave, will also change.
"To answer your main question, you can hear a difference if you change the transmitting medium."
That is a very odd description. Wavelength and frequency are proportional. Wavelength is defined by the speed of light divided by the frequency. I am not certain how they can say wavelength changes but pitch does not. Pitch is not a term used in my profession, however I believe it is solely based on frequency. If frequency changes, then so does the wavelength and vice versa.
This guy is great. The truth of every breakthrough technology is that it has equal potential for good as well as evil. I don't quite grasp the mechanism of how he is using 100kHz to generate audio at less than 20kHz. Human hearing range is categorized between 20 Hz to 20kHz, although both ends of that spectrum are typically not able to be heard by the majority of people. Most human verbal communication is typically between around 400 Hz to 2700-3400 Hz. Higher and lower frequencies beyond this range are unusual in normal conversations and even singing. I was originally thinking this is a harmonic generator that produces harmonics that allow it to reproduce lower frequencies, but I don't think so. Whatever it is, all I can think of are positive uses, but that is merely how my brain works. I have to try to actually come up with offensive ideas, defensive ideas are more natural to me.
You may be close to the target, and this might help. If they're using higher frequencies we can't hear, but then the wave hits the skull/grey matter, would that possibly shift the frequency down to hearing level? Much like listening to a boat motor above water then hearing it under water differently?
I'm not terribly certain about the complexities and idiosyncrasies of audio frequencies. It is adjacent to my field of RF, but has not been a major focus. I need to start taking a closer look at audio frequencies to learn more about that range. My career is built in RF communications from HF-EHF, although EHF is not as regularly a part of my research and application because it requires such exclusive hardware to generate and measure.
I'm breaking the rust & corrosion off a lot of things I learned in college many decades back, so I'm with you there.
Here's what I found on a quick search of "does frequency of sound change with medium". From "https://physics.stackexchange.com/questions/313779/besides-the-speed-of-sound-what-else-changes-when-the-transmitting-medium-chang":
"the wavelength of a sound wave would change as it experiences a change in medium. However, this does not mean that the pitch, which is related to the frequency, would change. In fact, it shouldn't change. In general, there will reflections of the wave upon a change of medium. Therefore, the 'loudness' which is related to the amplitude of the wave, will also change.
"To answer your main question, you can hear a difference if you change the transmitting medium."
That is a very odd description. Wavelength and frequency are proportional. Wavelength is defined by the speed of light divided by the frequency. I am not certain how they can say wavelength changes but pitch does not. Pitch is not a term used in my profession, however I believe it is solely based on frequency. If frequency changes, then so does the wavelength and vice versa.