Overmodulation

Overmodulation refers to the distortion of a signal that occurs when an audio or radio transmission is modulated beyond its maximum allowable level. This phenomenon typically results in a loss of clarity, introduction of unwanted harmonics, and potential interference. It is frequently encountered in audio engineering, telecommunications, and broadcasting, where the amplitude of the carrier wave is excessively varied, creating a distorted output that is harsher or less intelligible than intended.

Overmodulation meaning with examples

• In audio production, overmodulation can occur if the input levels are set too high during recording, resulting in clipped waveforms and a harsh, distorted sound in the final mix.
• The radio host noticed that the transmission quality suffered from overmodulation after several equipment adjustments, causing muddiness in the voices and making it difficult for listeners to understand the conversation.
• During the live concert, overmodulation led to screeching feedback as the microphones picked up too much signal, overwhelming the speakers and creating an uncomfortable listening experience.
• The engineer was consulted to diagnose why the broadcast signal was sounding 'squashed'; he determined that overmodulation during the processing stage was the primary issue, necessitating adjustments to the compression settings.
• In digital broadcasting, overmodulation can lead to significant interference with other channels, as the unintended harmonics extend beyond the intended frequency range, causing disruptions in service.