| 摘要 |
PURPOSE:To facilitate sound field control by increasing a howling margin. CONSTITUTION:An A/D converter 9 receiving a signal from a microphone is connected to a howling detection means 21, which detects howling between the microphone collecting sound of a reproduction field and each reproduction speaker. A sound field control means 22 for which the howling detection means 21 is connected measures a howling limit level by a howling signal from the howling detection means 21 and stores a sound field data in the state of no occurrence of howling to a sound field data memory, and a signal processing means 10 sets a sound field data so as to increase a large howling margin by using the sound field data relating to the state of no occurrence of howling and the signal processing means 10 processes the input signal by using the sound field data to control the sound field. |
