Crosstalk is unwanted leakage or bleed of a signal from one or more channels to other channels within a device.
It’s a fact of life when dealing with electronics, but with thoughtful layout of a PCB or appropriate shielding on cables, it can be kept to a negligible amount.
Measuring crosstalk is quite simple. We stimulate channel 1 with a signal, but measure the output of Channel 2. Channel 2 has no input, so on a device with zero crosstalk; it would have no output signal. Where crosstalk is present, we’ll see some signal that corresponds with the signal we’re giving Channel 1. To get a value for crosstalk, we take the level from the channel we’re measuring and divide by the full amount we measure on the stimulated channel. Because Crosstalk is a ratio, it’s usually expressed in dB.
Measuring stereo crosstalk is simple with a two channel analyzer, but when you have a home theatre receiver or a mixer with multiple inputs and outputs, it gets complicated.You could use a switcher and run through each combination of channels off and on, but it’s much easier to use a multichannel audio analyzer that can generate and analyze multiple channels independently and simultaneously.
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