Hearing Aid Input vs Output Test Sequence
This sequence follows the ANSI S3.22-1996 standard method for testing hearing aids with AGC (automatic gain control).
Introduction
This sequence follows the ANSI S3.22-1996 standard method for testing hearing aids with AGC (automatic gain control). The test uses an amplitude sweep from 50 90 dBSPL played through the anechoic test box speaker. This sweep is repeated at four frequencies (1 kHz – 4 kHz) in 1 kHz increments. The output of the hearing aid is plotted vs. the input on the graph.
For more information, see section 6.15 of the standard.
Required Hardware
- Audio Interface – Listen AudioConnect or similar
- Power Amp – Listen SCAmp or similar
- DC Power Source – Listen DCConnect or similar
- Anechoic Test Box – Bruel & Kjaer 4232 or similar
- 2 cc Coupler – Bruel & Kjaer 4946 or similar
- ½” Reference Mic – B&K 4192 or similar
Setup Diagram
Hardware Setup and Calibration
- Calibrate the anechoic test box speaker as instructed in the SoundCheck manual.
- Calibrate the reference microphone in the coupler as instructed in the SoundCheck manual.
- Connect the output 1 of your audio interface to the input of the amplifier powering the anechoic test box.
- Position your device inside the coupler, and place them at the reference point inside the anechoic test box. Connect the coupler to your microphone power supply.
- Connect the output of the mic supply to input 1 of your audio interface.
Get Sequence
This sequence is included in the Sequences folder of your SoundCheck installation.
