Dual Channel ModeSingle Channel ModeRoom AcousticsPresentation
Typical Two Channel Setup
Dual Channel Transfer Function

Dual-channel measurements compare two signals to find the similarities and differences between them. Transfer function and impulse response measurements are dual-channel measurements that compare the output of a device or system to the input signal that produced it. The transfer function is a dual-channel measurement technique that determines a system’s frequency response by comparing its input signal (the reference signal) to its output (measurement signal). The result of this measurement is a complex signal that represents the difference between the measurement and reference signals in both magnitude and phase. The measurement results show us the behavior of the system under test as a function of frequency or time.

This type of analysis needs two channels to be performed, one serving as input, the second one as reference. The signal is sent to the system under test (channel 1) and simultaneously to channel 2 as a reference. FFT is applied to channel 1 and 2, the difference between the two (transfer Function) is computed resulting in the System's Response in the frequency domain. By applying an inverse Fourier Transformation (IFR) it is possible to visualize the system’s impulse response.

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