JPS57169688A - Acoustic device in fish finder - Google Patents
Acoustic device in fish finderInfo
- Publication number
- JPS57169688A JPS57169688A JP5524681A JP5524681A JPS57169688A JP S57169688 A JPS57169688 A JP S57169688A JP 5524681 A JP5524681 A JP 5524681A JP 5524681 A JP5524681 A JP 5524681A JP S57169688 A JPS57169688 A JP S57169688A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- output
- gate
- signals
- comparator
- 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
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
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/88—Sonar systems specially adapted for specific applications
- G01S15/96—Sonar systems specially adapted for specific applications for locating fish
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
PURPOSE:To eliminate pulse-like noises, etc., effectively by integrating received output signals by utilizing the same, and gating the received signals passed through a delay circuit by using the integrated output thereof. CONSTITUTION:The output signals from a receiving part 4 pass through a waveform shaping circuit 5, after which they are made into an integrated waveform signal in a variable integrating circuit 6; this signal is inputted to a comparator 7. On the other hand, the comparator 7 compares the reference voltage from a reference voltage generating circuit 8 and the above-mentioned variably integrated signal output, and only when the variably integrated signal output is higher in potential, the output from the comparator appears. This output is supplied to a gate circuit 10 which opens a gate only at that time. On the other hand, the output signals from the part 4 are inputted through a delay circuit 9 to the circuit 10, and are applied to a modulating circuit 11 only during the period when the gate is open. The output signals from the gate circuit are modulated in a modulating circuit to the audio frequency signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5524681A JPS57169688A (en) | 1981-04-12 | 1981-04-12 | Acoustic device in fish finder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5524681A JPS57169688A (en) | 1981-04-12 | 1981-04-12 | Acoustic device in fish finder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57169688A true JPS57169688A (en) | 1982-10-19 |
Family
ID=12993233
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5524681A Pending JPS57169688A (en) | 1981-04-12 | 1981-04-12 | Acoustic device in fish finder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57169688A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0348187A (en) * | 1989-07-17 | 1991-03-01 | Yokogawa Electric Corp | Ultrasonic measuring apparatus |
-
1981
- 1981-04-12 JP JP5524681A patent/JPS57169688A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0348187A (en) * | 1989-07-17 | 1991-03-01 | Yokogawa Electric Corp | Ultrasonic measuring apparatus |
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