APPENDIX 1 - SPEECH AUDIOMETRY
31 MODEL 260 INSTRUCTION FOR USE
A1.6 FREE FIELD RECORDED SPEECH AUDIOMETRY
A1.6.1 Set Up:
a) Connect an external amplifier/speaker to the LINE OUT jack socket, and a CD, tape player, or other sound source
to the LINE IN jack socket; refer to Section 2.7 of this operating manual
b) Press SPEECH repeatedly to ensure that ‘LINE’ is displayed in capitals at the bottom left of the display (indicating
that the input from LINE IN is selected)
c) Press the FREE FIELD key
d) The line input is now routed to the external amplifier and speaker; use LEFT and RIGHT to select the required
amplifier channel
e) Play the 1kHz calibration tone on the recorded material and follow the calibration procedure in Appendix 2
f) The input signal level is adjusted in 1dB steps by use of the MASKING keys
g) Adjust the input signal such that the LEVEL dB bar graph reads 0dB
A1.6.2 Procedure:
As described in A1.3.2
A1.7 FREE FIELD RECORDED SPEECH AUDIOMETRY WITH COMPETING NOISE
(AUDIOMETER-GENERATED)
A1.7.1 Set Up: as described in A1.6.1 then:
a) Press the MASK key
b) Ensure that INT is displayed in capitals indicating that the audiometer-generated noise is selected; if necessary
press the MASK key until INT is displayed in capitals
c) Speech-weighted noise is routed to the competing LINE OUT channel
d) The level of competing noise is adjusted using the MASKING keys in 2.5dB or 5dB steps (depending on
settings - see Section 3.4.2)
A1.7.2 Procedure:
As described in A1.3.2 but adjusting the competing noise level as required.
A1.8 FREE FIELD RECORDED SPEECH AUDIOMETRY WITH COMPETING NOISE
(RECORDED)
A1.8.1 Set Up: as described in A1.7.1 except:
a) Ensure that EXT is displayed in capitals indicating that competing noise from the signal source is selected; if
necessary press the MASK key until EXT is displayed in capitals
b) Competing noise from the signal source is routed to the competing LINE OUT channel
c) Use the SIGNAL keys to adjust the signal channel and the MASKING keys to adjust the noise channel
A1.8.2 Procedure:
As described in A1.3.2 but adjusting the competing noise level as required.
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