| 摘要 |
An infant hearing test apparatus, primarily intended for use in the early detection of hearing problems of human infants in the birth to eighteen month age group, subjects an infant under test to two low intensity test sounds of an electronically filtered human voice in the frequency range of about 2000 to 4000 Hz. Of particular utility are the higher frequency sounds that are associated with the voice of a human female, for example a mother speaking a language dependent endearing term such as "Hi Baby", and a language independent sound to which the infant is sensitive, such as the sound of an infant crying. Both of these sounds are used to test the infant for body movement, for example head movement, with both sounds being reproduced at a relatively low intensity of about 46 dB and at a distance of about 12 inches from the infant. In the event that the infant does not respond to these low intensity sounds, a woman's voice is then used at a high intensity of about 90 dB SPL, and at a distance of about 3 inches, to further test the infant, in an attempt to elicit a reflex movement, such as an eye blink in response to this high intensity sound. These test sounds are digitally stored in a ROM in compressed data form.
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