| 发明名称 |
Automatic volume and frequency controlled sound masking system |
| 摘要 |
A sound masking system for generating background sound. The background sound is automatically adjusted to ambient noise levels by adjusting the amplitude of the frequency levels detected.
|
| 申请公布号 |
US4438526(A) |
申请公布日期 |
1984.03.20 |
| 申请号 |
US19820372033 |
申请日期 |
1982.04.26 |
| 申请人 |
CONWED CORPORATION |
发明人 |
THOMALLA, RICHARD O. |
| 分类号 |
G10K11/175;(IPC1-7):G10K11/00 |
主分类号 |
G10K11/175 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
|
| 地址 |
|
