JPS5631662A - Sound sensing unit in under water sound detector - Google Patents
Sound sensing unit in under water sound detectorInfo
- Publication number
- JPS5631662A JPS5631662A JP8224579A JP8224579A JPS5631662A JP S5631662 A JPS5631662 A JP S5631662A JP 8224579 A JP8224579 A JP 8224579A JP 8224579 A JP8224579 A JP 8224579A JP S5631662 A JPS5631662 A JP S5631662A
- Authority
- JP
- Japan
- Prior art keywords
- frequency signal
- frequency
- signal
- mixer
- reflected
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
- G01S7/523—Details of pulse systems
- G01S7/526—Receivers
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
PURPOSE:To suppress the doppler shift, by mixing the signal frequency-dividing the reflected frequency signal from the object under water with the local oscillation frequency signal at the 1st mixer, mixing the signal through the 1st filter with the reflected frequency signal at the 2nd mixer, and picking up the audible frequency signal at the 2nd filter. CONSTITUTION:The reflected frequency signal reflected from the object in water enters from the input terminal Pi and shaped at the shape circuit into a rectangular wave and frequency-divided at the frequency divider 2 into 1/n. This frequency signal fi/n and the oscillation frequency signal fo of the local oscillator 4 are mixed at the mixer 3, to deliver the frequency signal of (fi/n+ or -fo) from the filter circuit 5. This frequency signal and the input frequency signal fi are mixed at the mixer 6, and the audible frequency signal of (fi/n+fo)-fi is picked up via the filter circuit and audible tone is delivered from the speaker 9 via the amplifier 8. By setting the center value fbo of the audible frequency fo as fbo=fo-fio(n-1)/n, where; fio is the center frequency of fi, the amount of doppler shift can be suppressed to (n-1)/n.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8224579A JPS5926911B2 (en) | 1979-06-28 | 1979-06-28 | Listening device in underwater detection equipment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8224579A JPS5926911B2 (en) | 1979-06-28 | 1979-06-28 | Listening device in underwater detection equipment |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5631662A true JPS5631662A (en) | 1981-03-31 |
JPS5926911B2 JPS5926911B2 (en) | 1984-07-02 |
Family
ID=13769032
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8224579A Expired JPS5926911B2 (en) | 1979-06-28 | 1979-06-28 | Listening device in underwater detection equipment |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5926911B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5118514A (en) * | 1975-02-04 | 1976-02-14 | Hirozo Tanimura |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2019070578A (en) | 2017-10-10 | 2019-05-09 | 株式会社タムラ製作所 | Current detector |
-
1979
- 1979-06-28 JP JP8224579A patent/JPS5926911B2/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5118514A (en) * | 1975-02-04 | 1976-02-14 | Hirozo Tanimura | |
JPS5838861B2 (en) * | 1975-02-04 | 1983-08-25 | タニムラ ヒロゾウ | Jiki Tape Couch |
Also Published As
Publication number | Publication date |
---|---|
JPS5926911B2 (en) | 1984-07-02 |
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