9. PATIENT COMMUNICATION AND MONITORING
9.1 INTRODUCTION
The MIDIMATE 622 Diagnostic Audiometer has a high-quality patient
communication and monitoring system capable of satisfying the most
demanding requirements for sound quality. The instrument features built-in
talk-over and talk-back amplifiers with individually adjustable monitoring.
As previously mentioned in connection with speech audiometry (7.4), it is
essential that the Talk-Back system be of excellent quality in order to avoid
distortion increasing discrimination loss. However, it should be emphasized
that it is equally essential the system used for delivering the live voice signal
to the patient's ears be of equally high quality. Obviously one cannot make an
objective measurement of a patient's ability to hear and understand words in
speech audiometry if there is distortion in the presentation system!
The MIDIMATE 622 is supplied as standard with connections for a complete
patient communication and monitoring system. This system consists mainly
of optional accessories and comprises the following (part numbers in
parentheses):
!
electret Stetomike_ monitoring headset with built-in pilot-style micro-
phone (8-75-340)
!
monitoring loudspeaker, Talk-Over/Live Voice microphone (8-72-240)
and Adaptor Box (8-71-140)
!
Talk-Back microphone (8-72-240)
!
Patient response handswitch (standard accessory)
!
TDH 39 earphones fitted onto either ME 70 Noise-Excluding Headset or
TC 89 E headband (standard accessories)
It is essential that whatever microphones, etc., are used should be of high
quality.The Madsen Stetomike_ monitoring headset is strongly recom-
mended, however, not only for its high quality specifications but also for its
convenience and comfort. The microphone itself is located at an ideal
distance from the mouth and it must be emphasized that no communication/
monitoring system can adequately satisfy the requirements of speech
audiometry if the operator or patient is too far away from the microphone!
MIDIMATE 622 OPERATION MANUAL
9. Patient Communication & Monitoring
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