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Audio Driver Performance

Tones and white noise were generated using the synthesize tool of Sound Forge software (Sonic Foundry, Inc.). All sounds files are PCM type, 96 kHz sample rate, 16 bit, monaural. The same sound files are used for each test. The PC audio output volume is set to maximum and balance centered using Windows sound control panel. The audio equalizer is set to bypass (0 dB gain all frequencies). Audio level is set to center the output in the normal range; balance, treble and bass controls are centered. The control room monitor speakers volume is set to minimum (no sound) to prevent any interference. The right and left coaxial cables are disconnected at the control room side of the penetration panel and connected directly to audio driver box - the RF filters are in line for this test but the additional length of coaxial cable used in the scan room is not included. A Radio Shack 33-2050 sound level meter is connected to audio output port on the driver box with 8 cm of silicon tubing and a 2 cc coupler. Meter is set for C weighted, slow response.

Piezo Ceramic Drivers

With 270 cm of silicon tubing used for experiments and the 2 cc coupler.
Test Date





Frequency (Hz)
Left
Right
Left
Right
Left
Right
Left
Right
125
107
106






250
105
103






500
100
97






1K
84
85






2K
76
68






4K
54
52






8K
52
52






16K
52
52






White Noise
83
81






response curves


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