General Filters : Audio Precision AUX-0025

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Key features

Class D amplifiers use a switching process that adds fast-rising edges at the switching frequency to the audio output signal, presenting a difficult signal for audio analysis. The solution is to precondition the signal before presentation to the analyzer using a low-pass filter that reduces the out-of-band switching components (the fast edges) while passing the audio signal intact.

Since all Audio Precision analyzers provide two input channels, the AUX-0025 is a two-channel device. The input connectors replicate the input connectors found on analyzer inputs: XLR female and banana jacks. The output connectors are XLR male. Since loading capacitance is an issue, two short low-capacitance color-coded XLR male to XLR female cables are included for connection to the analyzer.

Switching amplifier output signal, unfiltered	Switching amplifier output signal, filtered through AUX-0025

The oscilloscope traces above illustrate the effect the filter has on the unfiltered output of a typical switching amplifier. The photo on the left shows a signal from a switching amplifier. The photo on the right shows the same signal at the output of the amplifier filtered by the AUX-0025 low-pass filter, which attenuates the out-of-band frequencies to permit distortion, noise and other performance measurements. Notice how the unfiltered signal masks other components modifying the sine wave, affecting the capability of an analyzer to properly characterize the performance of the amplifier.

• 制造商: Audio Precision
• 模型: AUX-0025