| 摘要 |
A spiral audio spectrum display system and technique. A plurality of signals are provided which represent power spectral density of an audio signal as a function of frequency. These signals are transformed to polar coordinates and combined with a fixed spiral reference signal in polar coordinates. The combined signal is displayed to provide a spiral representation of the audio spectrum signal. In specific embodiments, each octave span of the audio signal is displayed as a revolution of the spiral such that tones of different octaves are aligned and harmonic relationships between predominant tones are graphically illustrated. The system and display technique of the present invention allows both pitch and harmonic content of an audio signal to be visually identified.
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