| 摘要 |
Provision is made in a battery operated probe for detecting and wirelessly transmitting information to a remote receiver indicating that the battery power in the probe is low. In the preferred embodiment, both probe stylus position information and low battery information are transmitted by way of at least one infrared optical transmission device in the probe. A pair of phase locked loop circuits in the remote receiver are used to discriminate stylus position information from low battery condition information in the optical transmission.
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