Based upon the authors' previous study, in which they concluded that the articulation score obtained at the level of “most comfortable loudness for speech hearing” roughly coincides with the score of maximum articulation, the authors designed a simplified speech hearing test as a routine work which is named “MCL speech test”. This test is conducted in a following way;
(1) Most comfortable loudness level for speech hearing is determined at first with a connected discourse which is recorded in a channel of a stereophonic recording tape.
(2) Articulation score is then determined with 20 monosyllabic and meaningless test words which are recorded in another channel of the same tape with the same intensity as the connected discourse.
(3) Since the recording tape used in this test is a stereophonic, the examiner is required only to change the test channel from the connected discoures to the test words after the MCL is determined.
(4) It is possible to examine not only the articulation score but also hearing ability for distorted speech, switched speech, binaural fusion, binaural separation and so on at the level of MCL.
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