The inverter controlled by a microprocessor is applicable in many industrial applications. The two main parameters which are variable are amplitude and frequency. This paper describes an efficient and powerful modulation method. This technique permits the formation of the output wave easily and efficiently by means of PWM. This proposed inverter control scheme allows improvements on the AC drive performance, while using simple dedicated hardware. The proposed scheme would be attractive for mottrn applications that require a non-standard wave form. This paper presents the mathematical relation between the distortion, switching frequency and operating point, and the system parameters. The simulation results are obtained and commented upon.