Now I am trying to make a "indoor radio clock tower" using a sound device and a software of the wave generator.

I have already found that the wave clock could get the dummy time the generator made, using a headphone, So I knew to use the receive antenna and other experiments in vain.

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I become serious.

I got a sound AMP made in China, and a pair of speaker, and go over the experiment.

Actually, the speaker(sound) is not needed, however I expected that the magnet and coil made a proper eleactric wave.

As a result, the experiment was a failure.

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When I tried the same experiment using notebook computer at my office, the colleagues complained that they hear unpleasant harmonic sound"

But, I didn't hear anything at all.

Last night, when I amplified the sound at maximum range on the second floor of my room, my second daughter who was on the first floor of the living room, jumped to my room.

"Papa, a great unpleasant sound is heard. what's that?"

However, I could not hear the sound and , my wife who was together with the second daughter seemed not to hear.

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The 40kHz audio signal (or, the audio signal of the frequency of the 1/3) is to choose a person to attack.

I might sell this machine as instead of "indoor tower," "aging measuring instrument".

Moreover, if the market that "the harassment aimed at young people only" exists, this will be sold a lot.