| 摘要 |
<p>A transmission system wherein a transmitter includes a first tuned circuit (38, 40) and a transmitter coil (46) is part of a second tuned circuit (45, 46). A coupling means (42) couples energy between the first tuned circuit (38, 40) and the second tuned circuit (45, 46). A three wire unshielded cable (43) carries both radio frequency and audio frequency signals. Filter means (64, 66, 68) are provided for filtering the audio frequency signal so that it is free of interference from the radio frequency signal, which may include audio components due to its generally pulsed nature. The circuit may be adjusted for relatively constant coupling to a receiving coil (80) as separation between the transmitter coil (46) and the receiving coil changes (80).</p> |
