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A New Low-Cost Real-Time Audio Analyzer

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Paper describes a new low-cost audio real-time analyzer using integrated circuit logic for sampling 27 one-third octave filters. Unusual features include full 27-dB visual display on any oscilloscope; positive lock-in of display by providing sweep to oscilloscope; permanent display of the 27-dB calibration voltage; and dual level inputs for microphone and auxiliary level.

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AES - Audio Engineering Society