Test and Study of the Phase Characteristics in the Electro-acoustic Translation of Active Noise Cancellation Earmuff
Kean Chen · Audio Engineering · 2005
It is important to understand the phase characteristics of electro-acoustic device for the design and effect analysis of active noise cancellation controller. Based on self-made artificial head, the test and study on the phase characteristics for a commonly used electro-acoustic device is performed, and the curve of phase to frequency is given at different sound levels. The experiments indicate that the phase characteristics of electro-acoustic device change obviously at low frequency, while it tends to be stable when the frequency goes up gradually. The phase characteristics keep basically constant when the relative position of microphone in ear cavity is changed.