An Audio Test-Tone Generator

Jim van Bergen


Before each performance in a lengthy run or repertory situation, the signals of any microphones to be used must be set at predetermined levels. Commonly, during this part of the sound check, the sound operator makes the necessary adjustments at the mixing console while an assistant approaches each mic in turn and repeats the familiar “Testing: one, two, three.” The results of such mic tests are often unsatisfactory because of inconsistencies in signal gain, distance from the mic, and the uniqueness of each assistant’s voice. Worse yet, damage can occur when a novice assistant resorts to blowing or tapping or scratching on the mics. The test-tone generator illustrated in Figure 1 eliminates many ...

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