double modulation

double modulation

[¦dəb·əl ‚mäj·ə′lā·shən]
(communications)
A method of modulation in which a subcarrier is first modulated with the desired intelligence, and the modulated subcarrier is then used to modulate a second carrier having a higher frequency.
References in periodicals archive ?
It must be pointed out that Figure 6 is based on the double modulation wave carrier PWM strategy, which uses the central symmetry of output voltage vectors in three-level inverters.
Wang, "A double modulation wave carrier-based PWM strategy for three-level neutral point clamped converter," Power System Technology, vol.