Patent ID: 9326065
Filing Date: 2016-04-26
CPC Classification: H04R

Claim Text:
1. A sound processing apparatus that performs, for each of sound pickup unit pairs extracted from three or more sound pickup units, directivity synthesis processing of a first picked-up sound signal output from a first sound pickup unit comprising the sound pickup unit pair and a second picked-up sound signal output from a second sound pickup unit comprising the sound pickup unit pair, the apparatus comprising: a directivity synthesis processing section that generates, for each of the sound pickup unit pairs, a first directional picked-up sound signal by delaying the second picked-up sound signal relative to the first picked-up sound signal and combining the first picked-up sound signal with the delayed second picked-up sound signal, and generates, for each of the sound pickup unit pairs, a second directional picked-up sound signal by delaying the first picked-up sound signal relative to the second picked-up sound signal and combining the delayed first picked-up sound signal with the second picked-up sound signal, while sequentially changing the sound pickup unit pair; a comparison signal calculation section that generates, for each of the sound pickup unit pairs, a non-directional level signal indicating a level of a signal obtained by adding up the first directional picked-up sound signal and the second directional picked-up sound signal, and that generates a directional level signal obtained by adding up a first level signal indicating a level of the first directional picked-up sound signal and a second level signal indicating a level of the second directional picked-up sound signal; a level comparison section that acquires, for each of the sound pickup unit pairs, a level difference between the non-directional level signal and the directional level signal; and a delay operation section that adjusts an amount of the delay in the directivity synthesis processing section so as to reduce the level difference.