Tuner
Abstract
Abstract Translated from Japanese (57)【要約】 【課題】 入力信号の波形に、基準周期の倍音、3倍音 が含まれている場合においても正確にピッチを求めるこ とのできる調律器を提供することが課題である。 【解決手段】 入力波形のゼロクロス点を検出して2値 の参照波形を作成し、更に、この参照波形を所定時間づ つ遅延させ、この遅延波形と元の参照波形との間の相関 を求める。また、入力波形の上限ピーク値及び下限ピー ク値を検出し、参照波形の各区間内にピーク値が存在す るかどうかを認識し、参照波形と各遅延波形との間でピ ーク値の存在点の相関を求める。そして、前記各相関値 が高く得られたときの遅延量をこの入力波形の周期であ ると認識し、この入力信号のピッチを求める。 (57) [Summary] [PROBLEMS] It is an object to provide a tuner capable of accurately obtaining a pitch even when a waveform of an input signal includes overtones and overtones of a reference period. A zero-cross point of an input waveform is detected, a binary reference waveform is created, the reference waveform is delayed by a predetermined time, and a correlation between the delayed waveform and the original reference waveform is obtained. It also detects the upper peak value and the lower peak value of the input waveform, recognizes whether or not there is a peak value in each section of the reference waveform, and determines whether the peak value exists between the reference waveform and each delayed waveform. Find the correlation. Then, the delay amount when each of the correlation values is high is recognized as the period of this input waveform, and the pitch of this input signal is obtained.
Inventors
- 👤 Takeo Taku
- 👤 武夫 卓
Bibliographic Details
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