Outcome
Type |
Measure |
Description |
Time frame |
Safety issue |
Primary |
Speech reception threshold (SRT) for Beamformer Benefit (Oldenburg Sentence Test) |
The measure of the speech reception threshold (SRT) is a procedure to evaluate the speech intelligibility in different listening conditions. The SRT in noise is defined as the signal-to-noise ratio (SNR) needed to understand 50% of the presented sentences. The SNR is adapted based on the intelligibility score of the previous sentence. The SRT will be measured with the Oldenburg Sentence Test (OLSA), which is a standard speech intelligibility test in German. The OLSA test uses nonsense sentences with equivalent difficulty. |
At the test and retest appointment, maximum duration of the test/retest is 120 minutes |
|
Secondary |
Listening Effort for Beamformer Benefit (ACALES) |
The ACALES will be used to determine listening effort in different situations. Speech stimuli (OLSA sentences) are either presented at different levels in a background noise with fixed level or at different distances from the listener in a quiet environment. This creates different SNRs (speech levels at the position of the listener). The listening effort is subjectively rated on a predefined 13-point categorical scale with varying difficulties (SNRs or talker distance), 1= "no effort", 7 = "moderate effort" to 13 = "extreme effort". ACALES adaptively chooses the SNRs or talker distances for each presentation on the basis of previous ratings. |
At the test and retest appointment, maximum duration of the test/retest is 120 minutes |
|
Secondary |
Listening effort for SE benefit (ACALES) |
The ACALES will be used to determine listening effort in different situations. The ACALES will be repeated for 3 distances and 2 conditions (SE Off vs On). The outcome is a rating on a 13 points scale, as the difficulty is fixed by the distance now. |
At the test appointment, maximum duration of the test is 120 minutes |
|
Secondary |
Speech Intelligibility for SE benefit (Oldenburg Sentence Test) |
The measure of the speech perception in % is an alternative procedure to evaluate the speech intelligibility in different listening conditions. The Speech perception is defined as % correct words out of a sentence list of 20 sentences. Initially an individual presentation level is measured using adaptive procedure to determine the level necessary to understand 50% of all presented words. Afterwards the correct word score can be obtained using this individual presentation level (reduced by 1 dB) by calculating the ratio of correct words by the number of total words. |
At the test and retest appointment, maximum duration of the test/retest is 120 minutes |
|
Secondary |
Subjective Perception, Subjective Assessment for SE benefit (Questionnaire) |
A subjective assessment will be used to determine the subjective perception. For this purpose, a novel is either read by the tester aloud (with soft voice) or presented by a loudspeaker in a reverberant room in three different distances (2m, 4m, 8m) and in an adjacent room with door left ajar. The subject rates his/her perception of the presented real and recorded speech using a questionnaire on the dimensions "loudness, listening effort and speech intelligibility". The subjects will rate the perception on the same scale (1- 100%) for both tested conditions (SE Off and SE On) with pencils with different colors to get either absolute and relative ratings. |
At the test and retest appointment, maximum duration of the test/retest is 120 minutes |
|
Secondary |
Speech reception threshold (SRT) for Hearing Aid Benefit (Oldenburg Sentence Test) |
The measure of the speech reception threshold (SRT) is a procedure to evaluate the speech intelligibility in different listening conditions. The SRT will be measured with the Oldenburg Sentence Test (OLSA), which is a standard speech intelligibility test in German. SRTs are measured in 3 conditions: unaided, aided with fixed directional and aided with stereo zoom. |
At the test appointment, maximum duration of the test is 120 minutes |
|