JPS6450979A - Method for discriminating whistle sound - Google Patents
Method for discriminating whistle soundInfo
- Publication number
- JPS6450979A JPS6450979A JP20895187A JP20895187A JPS6450979A JP S6450979 A JPS6450979 A JP S6450979A JP 20895187 A JP20895187 A JP 20895187A JP 20895187 A JP20895187 A JP 20895187A JP S6450979 A JPS6450979 A JP S6450979A
- Authority
- JP
- Japan
- Prior art keywords
- threshold value
- acoustic signal
- whistle
- sound pressure
- pressure level
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
PURPOSE:To accurately and easily judge the presence of a whistle, by comparing the timewise changing sound pressure level of a received acoustic signal with two preset high and low threshold value levels. CONSTITUTION:The acoustic signal of the frequency band of the whistle sound emitted from a ship is received by a filter means 5 consisting of highly directional microphones 1a-1d and a BPF and the timewise change of the sound pressure level of the acoustic signal received by a detection means 6 is led out and the led-out sound pressure level of the acoustic signal is compared with two preset high and low threshold value levels by a microcomputer (MC) 8 as a discrimination means. Then, the presence of whistle sound is identified during a period when the sound pressure level of the acoustic signal exceeds the high threshold value level and subsequently reaches the low threshold value level and the absence thereof is identified during a period when said sound pressure level falls below the low threshold value level and subsequently reaches the high threshold value level. The MC 8 leads out the pattern of the whistle sound from the discrimination result of the presence and absence of the whistle sound to discriminate the same.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20895187A JPS6450979A (en) | 1987-08-21 | 1987-08-21 | Method for discriminating whistle sound |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20895187A JPS6450979A (en) | 1987-08-21 | 1987-08-21 | Method for discriminating whistle sound |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6450979A true JPS6450979A (en) | 1989-02-27 |
Family
ID=16564846
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20895187A Pending JPS6450979A (en) | 1987-08-21 | 1987-08-21 | Method for discriminating whistle sound |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6450979A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2514746A1 (en) | 2004-05-20 | 2012-10-24 | Japan Tobacco, Inc. | Stable crystal of 4-oxoquinoline compound |
| KR20200013172A (en) * | 2018-07-20 | 2020-02-06 | 한국해양대학교 산학협력단 | Method and apparatus for direction detection of ship whistle based on frequency detection and phase difference estimation for ships |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61226900A (en) * | 1985-03-30 | 1986-10-08 | 日立造船株式会社 | Acoustic signal recognition equipment for ship |
-
1987
- 1987-08-21 JP JP20895187A patent/JPS6450979A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61226900A (en) * | 1985-03-30 | 1986-10-08 | 日立造船株式会社 | Acoustic signal recognition equipment for ship |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2514746A1 (en) | 2004-05-20 | 2012-10-24 | Japan Tobacco, Inc. | Stable crystal of 4-oxoquinoline compound |
| KR20200013172A (en) * | 2018-07-20 | 2020-02-06 | 한국해양대학교 산학협력단 | Method and apparatus for direction detection of ship whistle based on frequency detection and phase difference estimation for ships |
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