Maico MA 53 Operating Instructions Manual

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Maico MA 53 Operating Instructions Manual Manual pdf 30 page image

Operating Instructions MA 53Geba_MA53_e_13a.doc 28 851 430/3 11/115.4 Speech AudiometryThe speech-recognition threshold SRT is the hearing threshold for speech. It isthe lowest level at which the patient correctly recognizes the stimuli 50% ofthe time. Usually, recognition is indicated by repetition of the speech-stimulusitem. The speech test can be done with recorded speech test material fromCD or tape or with the microphone and live voice using standardized wordlists. Different methods for speech tests are standardized worldwide such asthe ASHA guidelines for determining the threshold level for speech (Asha 21,page 353-356).Explain to the patient that he should repeat each word he hears.The patient should sit at a distance of at least 1 m from the device.Eliminate any obstructions which will interfere with the placement of theearphone cushions on the ear (i.e. hair, eyeglasses).Ensure the headphones are put on correctly: Red side on the right, blue sideon the left. Adjust the headband of the headphones so that the receivers areat the correct height (the sound output grid exactly facing the ear canal)Set the receiver selectors  and  to AC and the signal selectors  and both to TAPE/CD (if you are using recorded speech test material) or to MIC (ifyou wish to perform a speech test with livespeech).On the LCD-display  the initial setting forspeech audiometry (see picture 36)appears. The percent speech discriminationscore is displayed in the middle. Below this,the number of correct and incorrect wordsis shown.If you are using CD or tape, put the monitor phone on to hear the test words.Depending on your test method, use the level control knob  or ↔ to set thestart level.Perform the test words.Tally the correct words by pressing thefrequency up key  or →.Tally the incorrect words by pressing thefrequency down key  or .When you finish a word list, note thepercentage of the speech discrimination score.Picture 36 MA 53 display withinitial settings for speech audiometryPicture 37 MA 53 display withtypical result for speech audiometry