The Friendship Circle includes a pair of 20-foot stainless towers that generate electronic tones.

The insects didn't distinguish between wood pieces when artificially generated tones were used; only the actual sound of termites chewing had an effect.

Most had a single oscillator, that generated different tones as control buttons were pressed one-by-one.

Pushbutton phones often are arranged so that they may generate either pulses or tones (thus the switch).

This centered on a new kind of electronic keyboard system whose circuits were very simple yet able to generate rich tones that mimic traditional instruments.

It also had the ability to generate tones directly into the phone line.

A guitar uses vibrating strings to generate tones.

These tabs would generate tones that simulated the sound of the instrument selected.

After inspecting the sync generator, he discovered that it could generate different tones and used those for the game's sound effects.

The Boss OC-2 unit generates tones at one and two octaves down from the input signal.