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Free learning from The Open University. Featured content. Free courses. All content. Course content. About this free course 15 hours study. Level 3: Advanced. Course rewards. Free statement of participation on completion of these courses. Create your free OpenLearn profile. Course content Course content. Hearing Start this free course now. Free course Hearing. Figure 35 Equal loudness contours. The bottom curve, 0 phons, shows the absolute sensitivity of the ear as a function of frequency.
All tones lying on the same loudness contour sound equally loud, although their intensities and frequencies may differ, and are assigned the same value of phons. Activity What do you notice about the contours as loudness level increases from 0 to phons?
Answer The contours change in shape and become much flatter. Previous 10 The perception of intensity. Next Skip Your course resources Your course resources As you work through this course you will need various resources to help you complete some of the activities.
The mechanics of hearing - Reading 1 File. Download Resource. The intensity at any point of the medium is the amount of sound energy passing per second normally through unit area at that point. The loudness of a sound depends on the energy conveyed by the sound wave near the eardrum of the listener.
Loudness, being a sensation, also depends on the sensitivity of the ears of the listener. Thus the loudness of sound of a given intensity may differ from listener to listener. Further, two sounds of the same intensity but of different frequencies may differ in loudness even to the same listener because of the sensitivity of ears is different for different frequencies. So, loudness is a subjective quantity while intensity being a measurable quantity is an objective quantity for the sound wave.
Loudness depends on the energy conveyed by the wave near the eardrum of a listener. Loudness being a sensation also depends upon the sensitivity of the ears of listener. Thus, loudness of a sound of given intensity may differ from listener to listener. Further, two sounds of the same intensity, but of different frequencies may differ in loudness even to the same listener because the sensitivity of the ears is different for different frequencies.
Thus loudness is a subjective quantity, while intensity, being a measurable quantity, is an objective quantity for a sound wave. Question Papers. Question Papers Textbook Solutions MCQ Online Tests.
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