| 摘要 |
<p>A device and method is disclosed to correct intonation errors and generate vibrato in solo instruments and vocal performances in real time. The device (100) determines the pitch of a musical note produced by voice or instrument and shifts the pitch of that note to produce a very high quality and fidelity output. The device (100) includes a pitch detector that automatically recognizes the pitch of musical notes quickly. The detected pitch is then used as an input to a pitch corrector that converts the pitch of the input to an output with a desired pitch. The corrected musical note is then in tune with the pitch standard. The device and method employ a microprocessor (4) that samples the signal from a musical instrument or voice at regular intervals using an analog-to-digital converter (3) and then utilizes data derived from an auto-correlation function of the waveform to continuously determine the period of the waveform. The period of the waveform is then compared to a desired period or periods (such as found in a scale). The ratio of the waveform period and the desired period is computed to re-sample the waveform. This ratio is smoothed over time to remove instantaneous output pitch changes. The ratio is used to re-sample the input waveform. The resulting output waveform is processed through a digital-to-analog converter (10) and output through audio interfaces (12).</p> |
