62:. There are several definitions of the minimal audibility curve, defined in different international standards, and they differ significantly, giving rise to differences in audiograms according to the audiometer used. The ASA-1951 standard for example used a level of 16.5 dB SPL at 1 kHz whereas the later ANSI-1969/ISO-1963 standard uses 6.5 dB SPL, and it is common to allow a 10 dB correction for the older standard.
42:
with frequency relative to a standard graph known as the minimum audibility curve which is intended to represent 'normal' hearing. This is not the best threshold found for all subjects, under ideal test conditions, which is represented by around
38:, and this allows different frequencies to be presented to the subject, usually over calibrated headphones, at any specified level. The levels are, however, not absolute, but
130:
60:
97:
52:
23:
frequency for an average human, and is used as the reference level when measuring hearing loss with an
117:
48:
20:
153:
72:
148:
112:
107:
39:
142:
102:
92:
87:
35:
24:
82:
77:
28:
34:
Audiograms are produced using a piece of test equipment called an
56:
44:
59:standard to a level somewhat higher at 1 kHz
8:
7:
14:
19:is a standardized graph of the
1:
55:, but is standardised in an
170:
134:by Robert Thayer Sataloff
17:Minimum audibility curve
53:equal-loudness contours
98:Equal-loudness contour
118:Pure tone audiometry
49:threshold of hearing
21:threshold of hearing
73:Articulation index
161:
169:
168:
164:
163:
162:
160:
159:
158:
139:
138:
127:
122:
113:Psychoacoustics
108:Hearing (sense)
68:
27:as shown on an
12:
11:
5:
167:
165:
157:
156:
151:
141:
140:
137:
136:
126:
125:External links
123:
121:
120:
115:
110:
105:
100:
95:
90:
85:
80:
75:
69:
67:
64:
13:
10:
9:
6:
4:
3:
2:
166:
155:
152:
150:
147:
146:
144:
135:
133:
129:
128:
124:
119:
116:
114:
111:
109:
106:
104:
103:Hearing range
101:
99:
96:
94:
91:
89:
86:
84:
81:
79:
76:
74:
71:
70:
65:
63:
61:
58:
54:
50:
46:
41:
37:
32:
30:
26:
22:
18:
132:Hearing Loss
131:
33:
16:
15:
93:A-weighting
143:Categories
88:Audiometry
36:audiometer
25:audiometer
154:Acoustics
83:Audiology
78:Audiogram
29:audiogram
66:See also
40:weighted
149:Otology
51:on the
47:or the
43:0
57:ANSI
45:phon
145::
31:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.