Hello!
Are there any Freqency Signal Generartors that I can connect to a Bluetooth Speaker?

 

Yes, there are many, but we could be much more help if we knew what you are trying to do.

 

Yes, there are many, but we could be much more help if we knew what you are trying to do.

Thanks. I am doing a presentation on the various methods of how low frequency vibration can be emitted without anyone realizing it.

 

How low are the frequencies you want to use? Most Bluetooth speakers have very limited low frequency response. 100 Hz appears to be the usual low cut of frequency. You could probably find an ap for your phone to generate tones to test what you have. If you want to use really low frequencies (below 100Hz) you will have to use wired speakers.

 

The frequencies I wanted to use would be below human hearing, below 20Hz. My presentation is mostly focused on a wireless feature. The idea is how to find ways to mitigate low frequencies we do not know are coming our way 24/7. But first I have to prove to the team that this is very possible. It was suggested to me to try a transducer, but not sure how to do that either. Can you expand on what that suggestion of how a transducer enhances or replaces the bluetooth speaker?

 

Most commercially available low frequency vibration sources are very narrow bandwidth devices tuned to around 7.83Hz. For a choice of a range of low frequencies I would recommend a low frequency oscillator directly driving a good bass speaker.

 

Please do send me the recommendation....The next presentation will be for me to present to the team, how to mitigate or block these inaudible low frequencies. What would you do Kieth?

 

Welcome to AAC.

What do you propose is the source of the low frequency vibration when you are not purposely causing it? What is the cause?

 

Please do send me the recommendation....The next presentation will be for me to present to the team, how to mitigate or block these inaudible low frequencies. What would you do Kieth?

What are the natural sources of these low frequency vibrations? I would just avoid them.

 

Welcome to AAC.

What do you propose is the source of the low frequency vibration when you are not purposely causing it? What is the cause?

Thank you Ya'akov!
I think someone is actually experimenting with a signal generator that is connected to a bluetooth speaker or transducer that was placed in my home somewhere. The committee where I live is asking me to speak about it and do a presentation on how this can actully really happen. In this case, I wanted to purchase a few items and show them in real time how it is possible, to non-engineers. 1) I would like help purchasing the correct low frequency signal generator and a bluetooth speaker or transducer to demonstrate. (most average people do not understand electronics) 2) I would like to mitigate it for myself. How can I a) find the chip or transducer or speaker or ? hidden in my house; b) how can I block or interfere with the frequency in my house in the event I cannot find this hidden device that is functioning with the signal generator?

Thank you, Ya'akov.

 

What are the natural sources of these low frequency vibrations? I would just avoid them.

Hi Keith, So you think I should search for a" low frequency oscillator" instead of a frequency signal generator, right? Also, what do you think about my experience and why I have to present to my housing committee?

My story: I think someone is actually experimenting with a signal generator that is connected to a bluetooth speaker or transducer that was placed in my home somewhere. The committee where I live is asking me to speak about it and do a presentation on how this can actully really happen. In this case, I wanted to purchase a few items and show them in real time how it is possible, to non-engineers. 1) I would like help purchasing the correct low frequency signal generator and a bluetooth speaker or transducer to demonstrate. (most average people do not understand electronics) 2) I would like to mitigate it for myself. How can I a) find the chip or transducer or speaker or ? hidden in my house; b) how can I block or interfere with the frequency in my house in the event I cannot find this hidden device that is functioning with the signal generator?

Thank you, Keith.

 

I think someone is actually experimenting with a signal generator that is connected to a bluetooth speaker or transducer that was placed in my home somewhere.

What makes you think this?

 

Thank you Ya'akov!
I think someone is actually experimenting with a signal generator that is connected to a bluetooth speaker or transducer that was placed in my home somewhere. The committee where I live is asking me to speak about it and do a presentation on how this can actully really happen. In this case, I wanted to purchase a few items and show them in real time how it is possible, to non-engineers. 1) I would like help purchasing the correct low frequency signal generator and a bluetooth speaker or transducer to demonstrate. (most average people do not understand electronics) 2) I would like to mitigate it for myself. How can I a) find the chip or transducer or speaker or ? hidden in my house; b) how can I block or interfere with the frequency in my house in the event I cannot find this hidden device that is functioning with the signal generator?

Thank you, Ya'akov.

I would love to be able to help you with this but I have a problem: it doesn’t make any sense to me.

With absolutely no intention of slighting you in any way, I have to admit that I simply can’t accept that what you think has happened is the case. I can only work with my knowledge and experience and this just doesn’t fit into that.

There are a few problems, maybe you can fill in the gaps of me...

Why do you think it is a Bluetooth speaker?
Why do you think there are low frequencies involved?
Have you measured any low frequency acoustical energy with any sort of instrument?
What are/would be the effects of this low frequency energy?
Why would someone do this?

If you can help me with more information I might have a better shot at helping you, but here’s how it stands at this point:

Bluetooth speakers are designed to play music. Because low frequency sound below the audible range is not produced by music sources, the speakers not be designed to pass them. The passband of the BT codecs that digitally transfer the audio has a floor at 20Hz, which is audible but is it also effectively impossible to reproduce any more than very, very feebly by the speaker in a BT speaker because of physical size.

So right away I have reasons to think that what you describe can’t be the case.

In addition, you won’t be the first persons to join AAC and describe a similar scenario of “someone” doing “something” electronically. Please do keep in mind, I am not just dismissing you, nor am I looking down at you. Your experience is your experience and I am not there with you. I can only go on what I know to be possible and likely.

So, if you can explain why you think this particular thing is happening, and why it has the details that you recount, I might see things differently or have a better chance at helping.

All of this is intended to be respectful, please don’t take it any other way.

 

Why do you think it is a Bluetooth speaker?
ANSWER: I actually do not know its a bluetooth speaker, it is just 1) sounds similar when I was initially asked to describe what I was hearing 2) I'm not sure how the vibration is penetrating the property, either from inside the attic where the Heating and Air Techs were or on the roof were the Solar Techs were or penetrating from an external source. Not really sure, but I know it isn't wired.
Why do you think there are low frequencies involved?
ANSWER: I wasn't able to record the noise with my iPhone, so in researching I learned that it may take another type of microphone if the frequency is low. I also began experiencing negative physical ailments to my body that I have never experienced in my life, and also not everyone could hear it, only four other people could hear it. I learned that it can take longer exposure to hear or feel low frequency vibration. So, I work for engineers, (I am not an engineer) and I asked to borrow the SoundCAM from an Aerospace Engineer which records low frequency, and I turned off all the circuits, shut off the main water valve and unplugged the A/C Unit in the attic and the noise persisted so I was able to record it with the SoundCAM. (I tried to upload the video here but it wouldn't take the file, so see two screenshots.)
Have you measured any low frequency acoustical energy with any sort of instrument?
ANSWER: Yes, a Sound Camera.
What are/would be the effects of this low frequency energy?
ANSWER: 24/7 Low-bass noise and high-pitch squeal. It has various modes: Bass Humming, Pulsating, Thumping, various intensity of Vibration modes, and now a new added High-Pitch Squeal (measured at 10,000+ Hz with the Sonic App.)
Why would someone do this?
ANSWER: There are a few people that have a reason to do this (business and personal related), I have personnally been bullied by a few neighbors, these people have the know how and the means to do this. I don't want to expose my personal opinion regarding anyone on a public platform, but unfortunately, since we all have Doorbell Cams and Security Cams a less obvious method to bully someone is now necessary. The fact is, it is happening, even though we are unaware of the exact reasons yet.

 

Thank you Ya'akov for assisting me. It would be amazing if there was a method for blocking these low frequency vibration/sound waves. I am actually having to move out of my house temporarily while we figure this out. So I have to pay for two households by getting a second job. Anything you would do to help me would be greatly appreciated.

 

Also, this is why I must make the best presentation of this technology.

Interesting Reference: Dr. Bill Kahn, Harvard Univ.: https://insidesources.com/silent-sound-kills/

 

Why do you think there are low frequencies involved?

Because this, mabe:

The frequencies I wanted to use would be below human hearing, below 20Hz

 

Hi BobTPH,

It was because of the proof from the SoundCAM instrument. So I want to prepare the same device or system that is causing it for my presentation.

 

So, proof that the SoundCam can record infrasound that cannot be heard is proof that someone is deliberately bombarding you with sounds in the audio range that affect your health and most people cannot hear?

I will not be as kind as Ya’akov. Your problem would be better addressed by a medical professional.

 

BobTPH: Your answer demonstrates you have not attempted to research to determine the possibilities.

Please NOTE: The information shared here is limited to all that has occurred. But the reference below helps those with limited information gain better understanding.

One of many references: https://insidesources.com/silent-sound-kills/