Figures for Chapter 16 CROS, bone conduction and implanted aids Dillon (2001) Hearing Aids

Figure 16.1 Block diagram of a CROS hearing aid system, viewed from above the head. Better ear Poorer ear Source: Dillon (2001): Hearing Aids CROS

Figure 16.2 Coupler gain prescriptions for BTE and ITE hearing aids at used volume control setting for a CROS hearing aid. For the BTE hearing aid, a tube fitting is assumed. For the ITE hearing aid, a Janssen fitting is assumed. The gains shown are applicable to an average adult with no significant hearing loss in the good ear. The dashed lines below 500 Hz are not coupler gain prescriptions that should be achieved but represent upper limits that should not be exceeded. Source: Dillon (2001): Hearing Aids CROS prescription

Step 2 Step 1 Probe mic Figure 16.3 Test set-up for verifying and adjusting the gain-frequency response of a CROS hearing aid, showing the two different positions of the single test speaker. Source: Dillon (2001): Hearing Aids Verifying CROS response

Figure 16.4 Block diagram of a BICROS hearing aid system. + Better ear Poorer ear Source: Dillon (2001): Hearing Aids BICROS

Figure 16.5 Block diagram of the stereo CROS hearing aid. Source: Dillon (2001): Hearing Aids Stereo CROS

Figure 16.6 Bone-anchored hearing aid, showing its attachment through the skin to the bone. Amended by permission from Entific Medical Systems. Bone Subcutaneous tissue Skin Abutment Titanium fixture Connecting screw Source: Dillon (2001): Hearing Aids Bone-anchored hearing aid Details deleted to minimize file size. See Hearing Aids page 448 for further details.