Audio Analyzer Measurement Functions 5
U8903A User’s Guide 103
Crosstalk (channel driven and channel measured)
In audio systems with more than one channel, it is common
for a signal in one channel to appear at the output of
another channel at a reduced level. Crosstalk refers to this
signal leakage across channels and is expressed in dB
(default) or as a percentage.
Crosstalk is a measurement of the ratio of the signal
amplitude in an unused channel relative to that of a channel
driven with a signal. The unused channels should be
grounded, or set to an appropriate bias point. Crosstalk is
largely due to capacitive coupling between the channel
conductors in the device and generally varies with
frequency.
There are two modes of crosstalk measurement comprising
channel driven and channel measured. Crosstalk can be
computed as follows.
In the channel driven mode, the designated reference
channel will be injected with the stimulus. The presence of
this signal in the other channel will be measured. The
crosstalk result of the channel indicates the crosstalk from
the reference channel to that channel. Only one reference
channel can be selected at any one time.
rms value of signal measured
rms value of signal driven
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The reference channel always displays a value of 0 dB or 100% for all
crosstalk measurements.
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