| 摘要 |
<p>In the room (R), an acoustic unit (2) is located at given spacing (L) from the acoustic transducer (4). The unit (2) includes a sound receiver (20) and transmitter (21) for a trigger signal (S0, S1), passing via a signaling channel (S) between the transmitter and a receiver (22). In this way the trigger signal is transmitted from the auxiliary unit to the processor (10). The auxiliary unit (2) also includes a sound wave transmitter (25) generating sound (A2). The two transmitters (21, 25) are coupled such that when sending the sound signal, the trigger signal is transmitted via the signaling channel to the processor. An independent claim is included for the corresponding method of measurement.</p> |
