| 摘要 |
<p>PURPOSE:To execute tuning by a beat by adding a reference frequency signal corresponding to an octave and a pitch notation obtained from a pitch of an input sound signal, and a cent difference frequency signal corresponding to a cent deviation calculated from a pitch, an octave and a pitch notation. CONSTITUTION:From an input sound signal, a pitch is extracted, an octave and a pitch name of its pitch are retrieved, and from its pitch, the octave and the pitch notation, a cent deviation portion of the input sound signal is calculated. Subsequently, a reference frequency generating part 6 receives a signal of the octave and the pitch notation, a reference frequency signal of its signal is outputted to an adding circuit 8, a cent difference frequency generating part 7 outputs a cent difference frequency signal shifted by a cent deviation portion against a reference frequency to an adding circuit 8, and the adding circuit 8 displays the degree of a beat from a display part 10 through a display driving part 9 by a signal of a beat obtained by adding the reference frequency signal and the cent difference frequency signal. In such a way, tuning can be executed by a beat state.</p> |
