FONIX® FA-10 Hearing Evaluator™ - Frye Electronics

Option A: ABLB—Alternate Binaural Loudness Balance
This is a test for binaural recruitment. Recruitment is an abnormally large increase in hearing
sensation for a given increase in sound level. Derecruitment is an abnormally small increase
in hearing sensation for a given increase in sound level.
This test will automatically alternate a tone of a selectable frequency between the left ear and
right ear. The tone is presented for:
appoximately 370 milliseconds in the left ear,
approximately 130 milliseconds of silence,
approximately 370 milliseconds in the right ear,
approximately 130 milliseconds of silence
(the pattern repeats).
ABLB Setup:
right Hearing Aid Simulator: Option A
left Hearing Aid Simulator: Off
right Output: Phone
left Output: Phone
left Input: Stenger
right Input: Tone
Pulse: On
left simulus Reverse: On
right Stimulus: Off (does not matter)
frequency: (select desired frequency)
left Hearing Level: (select desired amplitude)
right Hearing Level: (select desired amplitude)
Perform the desired ABLB hearing test.
Notes:
Many other Option A, ABLB setups are possible. You may select different inputs and outputs.
Option A, ABLB works by disabling the Stimulus for one channel for 370 milliseconds, plus
130 milliseconds of silence (both channels), then disabling the other channel for 370 milliseconds
plus 130 milliseconds of silence (both channels).
Option A, ABLB is active when all four of these conditions are met:
• Left Hearing Aid Simulator switch set to Off
• Right Hearing Aid Simulator switch set to Option A ˛
• Pulse is ON
• Stimulus is enabled for both channels or stimulus is enabled for one channel if Stenger
is selected.
If Pulse is turned off, the FA-10 will operate as if the right Hearing Aid Simulator switch is
set to Off.
24 Chapter 4: Operation