Additionally, different frequency tones would be presented without food.

The graphs, they're the frequency tones that Destiny should put out.

Each user group would use a different low frequency tone.

Sounds that seem loud to humans often emit high frequency tones that can scare away dogs.

Both products included a high-pass filter which greatly attenuated all the low frequency tones that were expected to be beyond the capabilities of the target sound system.

This consists of superimposing a precise very low frequency tone on the audio signal.

One early consequence is that even young adults may lose the ability to hear very high frequency tones above 15 or 16 kHz.

Additional time slots are normally transmitted as a standard frequency tone, but can be preempted by voice messages if necessary:

This test consists solely of low frequency tones played at the frequencies of first, third and fifth position notes, as well as subharmonics.

The generators were howling in high frequency tones.