The most fundamental digital modulation techniques are based on keying:

In addition to improvements in these multiplexing systems, improved modulation techniques are being used.

Both use the same frequency range, but their modulation techniques are different.

In attempting to determine the distance to the layer, they asked Young if he could design an appropriate modulation technique.

This would be coupled with more efficient modulation techniques.

Frequency hopping is a basic modulation technique used in spread spectrum signal transmission.

This can be done directly or facilitated by the various modulation techniques described above.

In order to increase sensitivity, modulation techniques are often employed.

The desired quality of the current output waveform determines which modulation technique needs to be selected for a given application.

Inverters can use several modulation techniques to control their switching schemes.