1991 Fiscal Year Final Research Report Summary
A study on supplying system of urgent warning signal into perfect insulated space
| Project/Area Number |
02650419
|
|---|
| Research Category |
Grant-in-Aid for General Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
建築環境・環境工学
|
|---|
| Research Institution | Kyushu Institute of Design |
|---|
Principal Investigator |
FUJIWARA Kyoji Kyushu Institute of Design, Faculty of Design, Professor, 芸術工学部, 教授 (00038978)
|
|---|
| Project Period (FY) |
1990 – 1991
|
| Keywords | Insulated Space / Urgent Warning Signals / Power Density Spectrum / Correlation Coefficient / Residual Energy Ratio |
|---|
| Research Abstract |
The purpose of this study was to develop a supplying system of the important signals for us into the insulated space. In this study as important and urgent warning signals such as ambulance, patrol car and fire truck were employed. If the warning signal is included in the incoming sound, only the warning signal was introduced into the insulated space. At the last stage this supplying system was installed on the personal computer.
In this study the most important point is how to judge the urgent warning., signal. Both values of the auto correlation coefficient (CC) and the residual energy ratio (RER) of the power density spectrum (PDS) were used for the judgment, and those of incoming sound were compared with those of the reference sound. If the both of CC and RER satisfy the preset values, reference sound and incoming sound are considered to be the same signal. When the incoming sound is similar to the reference sound, the CC of the PDS is large and the RER is small. In this case it was very easy to judge the incoming sound.
As a conclusion, it was confirmed that if the preset values 0.7 for CC and 0.2 for RER are given, and both values are used for the judgment, then certain warning signal can be extracted from the incoming sound.
|
