| 摘要 |
PURPOSE:To emphasize the low-frequency sound less than the prescribed frequency by generating a rectangular wave signal based on the positive and negative of musical low-frequency component, frequency-dividing the signal, fetching the musical low-frequency component with prescribed sampling cycle to be multiplied to the frequency divider output, and matching with the original music signal. CONSTITUTION:Low-frequency component LSW of a sound signal SND is taken out, generates a rectangular wave signal RTS based on the positive and negative, and generates a rectangular wave signal HRTS while frequency-dividing the signal RTS. Simultaneously, the LSW is fetched with the prescribed sampling synchronization, multiplies sampling mean value (EVL) by a rectangular wave HRTS, then, cuts even numbered order higher harmonic wave component included in a multiplication result DTR, and an obtained signal LSD is matched with the original sound signal SND to emphasize the low-frequency sound. Thus, the low-frequency sound can be emphasized without any manual work to the music signal of the source, and the phase surrounding of the music signal and the rise of the gain in the middle register can be eliminated. |
