Page 6 of Triano Technical Guide by Hearing Planet

2 cc coupler ansi s3.22-1996 directivity index db 8 7 measurement on kemar with hearing instrument triano 3 tm directional characteristics for low frequencies 0° 250 hz 500 hz 1 khz directional characteristics for high frequencies 0° 2 khz 3 khz 4 khz 5 khz 6 5 4 3 2 without hearing instrument 1 0 -1 -2 0.125 0.25 measured on kemar 270° 90° 270° 90° 10 db 180° left side 10 db measured on kemar 180° left side 0.5 1 1.6 2 2.5 f 4 khz 8 directivity data ­ measurement on kemar ai ­ di articulation index ai weighted directivity di di in the range of 2 ­ 5 khz front-side ratio average data at 90° and 270° front-rear ratio average data at 180° 13 db 6.5 ­ 7.0 db 12 db 6.1 db horizontal alignment of microphones it is important that the hearing instrument fits on the ear such that the 3 microphones are directed along a horizontal plane to ensure the best directivity microphone ports

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