The analogous pitch and tone of tinnitus was identified in 56 ears complaining of tinnitus. 4 types of test sounds were used which were generated by TDH 49 ear phone and 4 kinds of electric signals; sine, triangle, rectangle and saw-tooth waves. Test sounds were given to each contralateral ear and frequency and intensity of tinnitus were determined by use of pitch matching and loudness balance method. Tinnitus of 27 ears were similar to sounds which were generated by rectangular, 7 ears were triangular, 9 ears were saw-tooth waves and 9 other ears were shown to be sine wave but 4 ears were undeterminable under these test conditions. Relationships between pitch of tinnitus and impaired frequency of the audiogram is very high (r=0.80). The pitch of tinnitus is initiated by the impaired auditory peripheral center as spacial information from which abnormal discharges were generated.
