Speech Reception Threshold (Srt) In Table Mode - Interacoustics Affinity 2.0 Additional Information

2.0
Affinity Additional Information

1.7.5.1 Speech Reception Threshold (SRT) in Table Mode

The SRT examines at which level 50% of the speech material (usually numbers or spondaic words) is
repeated correctly. The SRT can be used as a cross check of the air conduction audiometry and should
closely agree with the PTA (Pure Tone Average). The PTA can be calculated in different ways but is usually
the average of thresholds obtained at 500, 1000, 2000 and 4000 Hz. It is generally accepted that if the PTA
and the SRT is within ± 6 dB of each other the accordance is good, if it is ±7 to 12 dB it is adequate, and if it
±13 or more it is poor.
1) Perform air and bone conduction audiometry as described in section 0 and 1.6.3 in order to obtain the
PTA.
2) Open the Speech Screen
3) Ensure that the SRT test is active. This is shown by the SRT label being orange
4) Choose the input for channel 1 (microphone, CD, or wave file). In case of wave files, check if the
preferred material, and wordlist are selected.
Note: In case of microphone/CD the speech material can be calibrated by speaking into the
microphone/playing the calibration track. Adjust the corresponding arrow keys to 0 VU (see details in section
1.6.5).
5) Start with the better hearing ear according to the audiogram and set the intensity to 15 dB above Pure
Tone Average.
6) Begin presenting the speech material and reducing the intensity in 5 dB steps for every correctly
repeated word. Use the Store button to store the SRT.
7) Upon changing Transducer, Mask ing, and/or Aided and re-testing an additional SRT entry will appear
in the SRT table (see illustration above). This allows for multiple SRT measurements to be shown in
the SRT table.
If the SRT is not in accordance with the air conduction thresholds, the air conduction audiogram should be
checked and the procedure repeated (Nielsen & Carver 1997; Katz 2002).
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