JP2000088945A - Sound field simulation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily evaluate the performance of a sonar device at a shallow sea region in a deep sea region by simulating the environment of the shallow sea region with a number of irregular reflections at the deep sea region with less irregular reflections of sound waves. SOLUTION: A control circuit 7 sets the amount of delay of delay circuits 8 and 9 and the gain of gain control circuits 10 and 11 so that a synthesis wave arrives from a known reflection position at the bottom of the sea. Also, the control circuit 7 sets the amount of delay corresponding to the amount of delay from a direct wave to the delay circuits 8 and 9 when a sound wave from the sound source arrives at the sonar device after being reflected from the bottom of the sea to be simulated. Therefore, a sound wave radiator 3 generates a direct wave based on a signal being transmitted from a sound source signal generation circuit 1 without going through a delay circuit and at the same time the synthesis wave of the sound wave being radiated by the sound wave radiator 3 based on a signal through the delay circuit 8 and the sound wave being radiated by the sound wave radiator 14 becomes a simulated reflection wave.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound field simulating device used for testing a sound source detecting device such as a sonar device and capable of simulating a sound field in a shallow sea area in a deep sea area.

[0002]

2. Description of the Related Art When a sonar device is used in a deep sea area, there are few obstacles such as irregular reflection of sound, so that the sonar device can easily specify a sound source direction. When a sonar device is tested in the deep sea area, a value close to a theoretical value is obtained as a test result. However, in shallow waters, there are many irregular reflections of sound due to various factors such as the sea surface and the sea floor. FIG. 6 is a schematic diagram showing a state of sound wave propagation in a deep sea area. Also, FIG.
It is a schematic diagram which shows a mode of sound wave propagation in a shallow sea area. As shown in FIG. 7, in a shallow sea area, in addition to a direct wave from a sound source, a reflected wave on the sea surface or the sea floor appears.

[0003] A sonar device is required to have a performance capable of specifying a sound source direction even in a shallow sea area where there are many irregular reflections of sound.
Therefore, whether such performance is actually satisfied,
It is necessary to test in lakes and underwater shallow waters. However,
In the shallow waters, the rights relationship such as fishing right is complicated, and it often takes time, labor, and cost to obtain permission to test the sonar device. In some cases, testing may not be possible.

[0004]

Therefore, if it is possible to simulate the environment of a shallow sea in a deep sea where there are relatively few problems, it is possible to evaluate the performance of the sonar device in the shallow sea in the deep sea and to test the sonar device in the deep sea. Becomes easier. However, as described above, a sound wave propagation path that does not appear in the deep sea area also occurs in the shallow sea area, and it is difficult to simulate the sound wave propagation environment in the shallow sea area in the deep sea area.

Accordingly, an object of the present invention is to realize a sound field simulation device capable of simulating a sound wave propagation environment in a shallow sea area in a deep sea area.

[0006]

A sound field simulating apparatus according to the present invention comprises: a direct wave generating means for generating a direct wave that directly reaches a sound source detecting apparatus based on a signal from a sound source signal generating means; and a sound source signal generating means. And a simulated reflected wave generation means for generating a reflected wave of a sound wave in a simulated target environment based on a signal from the simulated sound wave. The sound field simulation device may have a configuration including a plurality of simulation reflection wave generation means.

The sound field simulating device includes a position detecting means for detecting the position of the sound source detecting device as viewed from the sound source, and the simulated reflected wave generating means detects the position of the sound source detecting device detected by the position detecting device and the position of the simulated target environment. A configuration in which a simulated reflected wave is generated in accordance with the position of reflection of a sound wave from a sound source may be employed.

In the sound field simulating device, the simulated reflected wave generating means includes:
A first delay circuit for delaying a signal from the sound source, a second delay circuit for delaying a signal from the sound source, a first gain control circuit for adjusting a gain of an output signal of the first delay circuit, A second gain control circuit that adjusts the gain of the output signal of the second delay circuit, a first sound wave radiator that emits sound waves corresponding to the output of the first gain control circuit, and a second gain control circuit. A second sound wave radiator that emits a sound wave according to the output, a position of the sound source detecting device, a reflection position of the sound wave in the simulation target environment, and a relative position between the first sound wave radiator and the second sound wave radiator , A control circuit that determines the delay amounts of the first delay circuit and the second delay circuit and the gains of the first gain control circuit and the second gain control circuit.

The direct wave generating means has an adding circuit for adding a signal from the sound source signal generating means and an output signal of the first gain control circuit, and the first sound wave radiator is provided for the direct wave generating means. The configuration may be such that the output of the adder circuit is input because it is also used as a sound wave radiator.

The control circuit is configured to delay the first delay circuit and the second delay circuit so that the sound wave from the first sound wave radiator and the sound wave from the second sound wave radiator simultaneously reach the sound source detecting device. Adjust the volume. Further, the control circuit may be configured to support a sound wave radiator installed on a side closer to a path to a sound source detection device of a combined wave of a sound wave from the first sound wave radiator and a sound wave from the second sound wave radiator. The gain of the gain control circuit is increased.

[0011]

FIG. 1 is a block diagram showing a first embodiment of a sound field simulator according to the present invention. As shown in FIG. 1, the signal generated by the sound source signal generation circuit 1 is input to delay circuits 8, 9 and an addition circuit 12. Delay circuit 8
The signal delayed by the above is input to the adding circuit 12 after the gain is adjusted by the gain control circuit 10. The addition circuit 12 adds the signal from the sound source signal generation circuit 1 and the signal from the gain control circuit 10. The output of the adder circuit 12 is
And is input to the sound wave radiator 3. The sound wave radiator 3 generates and emits a sound wave according to the input signal.

The signal delayed by the delay circuit 9 is gain-adjusted by the gain control circuit 11 and then amplified by the amplifier circuit 13 and input to the sound wave radiator 14. The sound wave radiator 14 generates and emits a sound wave according to the input signal. Sound wave receiver 5
Receives an acoustic signal from a pinger transmitter 41 attached to the sonar device, converts the acoustic signal into an electric signal, and outputs the electric signal to the sonar position detection circuit 6. The sonar position detection circuit 6
The sonar position is calculated based on the acoustic signal of the pinger transmitter 41 received by the sound wave receiver 5 and the position information is calculated by the controller 7.
Output to The control unit 7 controls the delay amounts of the delay circuits 8 and 9 and the gains of the gain control circuits 10 and 11 according to the position information.

Next, the operation will be described with reference to the schematic diagrams of FIGS. In this embodiment, the sound wave based on the signal input directly from the sound source signal generation circuit 1 to the addition circuit 12 forms a direct wave, and the sound wave based on the signal passed through the delay circuit 8 and the gain control circuit 10 and the delay circuit 9 and A composite wave with a sound wave based on the signal passed through the gain control circuit 11 simulates a reflected wave.

2 and 3, a submarine equipped with a sonar device exists in the deep sea. Then, the sound field simulation device gives a direct wave from the sound source and a reflected wave on the sea floor or the like to the sonar device. That is, the sound wave radiator 3 and the sound wave radiator 14 connected to the main body of the sound field simulating device are placed at appropriate places in the sea. The installation position of the sound wave radiator 3 is a sound source position to be detected by the sonar device, and the installation position of the sound wave radiator 14 is an arbitrary position away from the sound wave radiator 3. Then, the sound source signal generation circuit 1 outputs the direct
A sound wave generated by the sound wave radiator 3 based on a signal input to the sound wave becomes a direct wave on the sound wave propagation path A as shown in FIG.

The delay circuit 8 and the gain control circuit 10
Sound wave radiators 3 and 1 based on the sound wave based on the signal passed through and the signal passed through delay circuit 9 and gain control circuit 11.
4 is a sound wave propagation path A ′, shown in FIG.
The sonar device is reached by C '. If the sound wave levels from the sound wave radiators 3 and 14 are appropriately set, it is possible to simulate the synthesized wave to reach the sonar device via the sound wave propagation path C.

Hereinafter, a method of forming the sound wave propagation path C will be described. The pinger transmitter 41 that outputs an acoustic signal at a predetermined frequency and transmission cycle is attached to the sonar device. The operation cycle of the sonar position detection circuit 6 is synchronized with the transmission cycle of the pinger transmitter 41. The sound wave receiver 5 is installed near the sound wave radiator 3. Therefore, the sonar position detection circuit 6 can know the relative position of the sonar device from the sound wave radiator 3 based on the acoustic signal received by the sound wave receiver 5.

When the performance of the sonar device is tested in the presence of a reflected wave from the bottom of the sea as an obstacle, the state of the bottom of the sea to be simulated is set in advance. Therefore,
If it is assumed that the sound wave propagation path C simulates the path of the reflected wave from the sea floor, it is determined at which position on the sea floor the opposite sound wave reaches the sonar device. That is, the direction (angle) of the sound wave propagation path C with respect to the sound propagation path A can be understood. That is, it is possible to know from which direction the synthetic wave of each sound wave that reaches the sonar device via the sound wave propagation paths A ′ and C ′ should be incident on the sonar device. Also, since the reflection position of the sound wave reaching the sonar device at the sea floor is known, how long after the time when the direct wave passing through the sound propagation path A reaches the sonar device, the reflection through the sound wave propagation path C is delayed. Know if the waves should reach the sonar device.

Therefore, the control circuit 7 controls the delay amounts of the delay circuits 8 and 9 and the gain control circuits 10 and 1 to the sonar device so that the synthesized wave arrives from the known reflection position on the seabed.
The gain of 1 is calculated, and the calculated value is set in the delay circuits 8 and 9 and the gain control circuits 10 and 11. For example, if the gains of the gain control circuits 10 and 11 are made the same, the start point of the sound propagation path C can be located in the middle of the installation positions of the sound wave radiators 3 and 14. Further, if the gain of the gain control circuit 10 is increased, the start point of the sound propagation path C can be set closer to the position of the sound wave radiator 3. As described above, the control circuit 7 determines the gains of the gain control circuits 10 and 11 according to the start point of the sound propagation path C to be set.

Further, the control circuit 7 generates a sound wave from a sound source,
The delay according to the delay amount from the direct wave when reaching the sonar device after being reflected on the simulated sea floor is determined by the delay circuit 8,
Set to 9. That is, the timing at which the sound wave passing through the sound propagation path A ′ and the sound wave passing through the sound propagation path C ′ should reach the sonar device is different from the timing at which the direct wave reaches the sound source (in this case, the sound emitter 3). Is set so that when the sound wave is reflected from a known reflection point on the seabed and reaches the sonar device, the sound wave is delayed by a time that is delayed.

Further, since the length of the sound propagation path A 'is different from the length of the sound propagation path C', the control circuit 7 determines that the sound wave passing through the sound propagation path A 'and the sound wave passing through the sound propagation path C' are different. The delay amounts of the delay circuits 8 and 9 are set in consideration of the fact that the signals arrive at the sonar device at the same time.

As described above, the control circuit 7 controls the delay circuit 8,
9 and the gains of the gain control circuits 10 and 11 are set, the sound source simulating apparatus 1 generates the sound source signal generation circuit 1 →
The sound wave radiated through the path of the addition circuit 12 → the amplification circuit 2 → the sound wave radiator 3 reaches the sonar device as a direct wave from the sound source. Further, a sound wave (a sound wave caused by the sound propagation path A ′) radiated through the path of the sound source signal generation circuit 1 → the delay circuit 8 → the gain control circuit 10 → the addition circuit 12 → the amplification circuit 2 → the sound wave radiator 3; Signal generation circuit 1 → delay circuit 9 → gain control circuit 11 → amplification circuit 13 → sound wave radiator 14
When viewed from the sonar device, the synthesized wave with the sound wave radiated through the path (the sound wave generated by the sound propagation path C ′) is detected as the sound wave arriving through the sound propagation path C. The sound propagation path C is a path of a reflected wave reflected on the sea floor to be simulated.

In the sonar device, in a situation where a direct wave and a synthetic wave are received, that is, in a situation where a direct wave and a simulated wave of a reflected wave are received, a sound source direction (an installation position of the sound wave radiator 3) is specified. You can test whether you can.

If the control circuit 7 sets the delay amounts of the delay circuits 8 and 9 and the gains of the gain control circuits 10 and 11 in accordance with the relative positions of the sound wave radiators 3 and 14, as described above, Even if the position changes, the sound wave propagation path C from a desired direction can always be simulated. Further, if the delay amounts of the delay circuits 8 and 9 and the gains of the gain control circuits 10 and 11 are set as described above according to the scattering position of the sound wave to be simulated, any sound wave scattering situation can be simulated. .

FIG. 4 is a block diagram showing a second embodiment of the present invention. In this embodiment, the delay circuit 15 and the gain control circuit 16 are different from the configuration shown in FIG.
And a delay circuit 18, a gain control circuit 19, an amplifier circuit 20, and an acoustic wave radiator 21. The output of the gain control circuit 16 is input to the addition circuit 12. The control circuit 7 controls the delay amounts of the delay circuits 15 and 18 and the gains of the gain control circuits 16 and 19.

Next, the operation will be described with reference to the schematic diagram of FIG. In this case, the sound wave propagation path C simulates the path of the reflected wave at the sea floor, and the sound wave propagation path B simulates the path of another reflected wave. Sound wave based on the signal passed through delay circuit 15 and gain control circuit 16 and delay circuit 18
The sound wave generated by the sound wave radiators 3 and 21 based on the signal passed through the gain control circuit 19 reaches the sonar device through sound wave propagation paths A ″ and B ′ shown in FIG.
Then, the synthesized wave of each sound wave that reaches the sonar device via the sound wave propagation paths A ″ and B ′ is a sound wave that has passed through the sound wave propagation path B.

Assuming that the sound wave propagation path B simulates the path of the reflected wave from the sea surface, it is set at which position on the sea surface the rejected sound wave reaches the sonar device. That is, the direction (angle) of the sound wave propagation path B with respect to the sound propagation path A is determined. Further, since the reflection position of the sound wave reaching the sonar device on the sea surface is known, how long after the time when the direct wave passing through the sound propagation path A reaches the sonar device, the reflection through the sound wave propagation path B is delayed. Know if the waves should reach the sonar device. In addition, it is possible to know from which direction the synthetic wave of each sound wave that reaches the sonar device via the sound wave propagation paths A ″ and B ′ should be incident on the sonar device.

Therefore, the control circuit 7 controls the delay amounts of the delay circuits 15 and 16 and the gain control circuit 1 so that the synthesized wave arrives from the known reflection position on the sea surface to the sonar device.
The gains 6 and 19 are calculated. That is, the control circuit 7
Is, according to the start point of the sound propagation path B to be set,
The gain of the gain control circuits 16 and 19 is determined. Further, the timing at which the sound wave passing through the sound propagation path A ″ and the sound wave passing through the sound propagation path B ′ should reach the sonar device is different from the timing at which the direct wave reaches the sound source (the sound source of the sound wave radiator 3). The delay amounts of the delay circuits 15 and 16 are set so that the timing is delayed by a time delayed when the sound wave is reflected from the known reflection point on the sea surface from the position) and reaches the sonar device.

Further, the control circuit 7 controls the delay circuits 15 and 19 in consideration of the fact that the sound wave passing through the sound propagation path A ″ and the sound wave passing through the sound propagation path B ′ simultaneously reach the sonar device. Set the delay amount.

The control circuit 7 controls the delay circuit 1 as described above.
If the delay amounts of the gain control circuits 5 and 18 and the gains of the gain control circuits 16 and 19 are set, in the sound field simulation device, the sound source signal generation circuit 1 → the delay circuit 15 → the gain control circuit 16 → the addition circuit 12
→ amplifying circuit 2 → sound wave radiated through the path of sound wave radiator 3 (sound wave due to sound propagation path A ″), sound source signal generating circuit 1 → delay circuit 18 → gain control circuit 19 → amplifying circuit 20 → sound wave The combined wave with the sound wave radiated through the path of the radiator 21 (the sound wave by the sound propagation path B ′) is detected as a sound wave arriving through the sound propagation path B when viewed from the sonar device. The sound propagation path B is a path of a reflected wave reflected on the sea surface to be simulated.

The sound wave propagation path C is formed in the same manner as in the first embodiment. Therefore, in the sonar device, in a situation where a direct wave and each composite wave are received, that is, in a situation where a direct wave and a simulated wave of a reflected wave on the sea floor and the sea surface are received, the sound source direction (installation of the sound wave radiator 3) is set. Position) can be tested.

If a delay circuit, a gain control circuit, an amplifier circuit and an acoustic wave radiator are further added, more paths can be simulated simultaneously. In each of the above embodiments, the case of simulating the sea floor and the sea surface has been described.However, it is possible to simulate various sound wave reflection factors such as a school of fish and a thermocline in the sea, and as a result, in the deep sea area, It is possible to evaluate the performance of the sonar device under various environments.

[0032]

As described above, according to the present invention, a sound field simulating apparatus is provided with a direct wave generating means for generating a direct wave that reaches a sound source detecting apparatus directly based on a signal from a sound source signal generating means, Since it is configured to include a simulated reflected wave generating means for generating a reflected wave of a sound wave in a simulated target environment based on a signal from a sound source signal generating means, shallow reflection of sound due to various factors such as the sea surface and the sea floor is large. There is an effect that the sound wave propagation environment in the sea area can be simulated in the deep sea area. When a plurality of simulated reflected wave generation means are included, many reflected wave paths can be simulated simultaneously.

If a simulated reflected wave is generated in accordance with the position of the sound source detecting device to be tested and the position of the sound wave reflected from the sound source in the simulated environment, any reflected wave path can be simulated. Can be.

The simulated reflected wave generation means controls a first delay circuit for delaying a signal from the sound source, a second delay circuit for delaying a signal from the sound source, and a gain adjustment of an output signal of the first delay circuit. A first gain control circuit that performs gain adjustment, a second gain control circuit that performs gain adjustment of an output signal of the second delay circuit,
A first sound wave radiator that emits a sound wave according to the output of the gain control circuit, a second sound wave radiator that emits a sound wave according to the output of the second gain control circuit, The delay amounts of the first delay circuit and the second delay circuit and the first delay circuit and the first delay circuit are set according to the reflection position of the sound wave in the simulation target environment and the relative position between the first sound wave radiator and the second sound wave radiator. When the control circuit is configured to include a gain control circuit and a control circuit that determines the gain of the second gain control circuit, the control circuit may control the delay amounts of the first delay circuit and the second delay circuit and the first delay circuit and the first delay circuit. By appropriately setting the gain of the gain control circuit and the gain of the second gain control circuit, various reflected wave paths can be set, and the sound field in the shallow sea area can be set freely.

The direct wave generation means has an addition circuit for adding the signal from the sound source signal generation means and the output signal of the first gain control circuit, and the first sound wave radiator receives the output of the addition circuit. In such a case, the first sound wave radiator can be shared by the direct wave generation means and the simulated reflected wave generation means.

The control circuit controls the delays of the first delay circuit and the second delay circuit so that the sound wave from the first sound wave radiator and the sound wave from the second sound wave radiator simultaneously reach the sound source detecting device. If the configuration is such that the amount is adjusted, the simulated reflected wave can be reliably received by the sound source detection device to be tested.

The control circuit may include a sound wave radiator installed on a side close to a path leading to a sound source detecting device of a combined wave of the sound wave from the first sound wave radiator and the sound wave from the second sound wave radiator. If the gain of the corresponding gain control circuit is configured to be high, the simulated reflected wave can be received from the arbitrary direction by the sound source detecting device to be tested.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of a sound field simulation device according to the present invention.

FIG. 2 is a schematic diagram for explaining a method of creating a direct wave.

FIG. 3 is a schematic diagram for explaining a method of creating a simulated reflected wave.

FIG. 4 is a block diagram showing a sound field simulation device according to a second embodiment of the present invention.

FIG. 5 is a schematic diagram for explaining a method of creating a simulated reflected wave.

FIG. 6 is a schematic diagram showing a state of sound wave propagation in a deep sea area.

FIG. 7 is a schematic diagram showing a state of sound wave propagation in a shallow sea area.

[Explanation of symbols]

Reference Signs List 1 sound source signal generation circuit (sound source signal generation means) 2 amplifier circuit 3 sound wave radiator (first sound wave radiator, direct wave generation means, simulated reflected wave generation means) 5 sound wave receiver (position detection means) 6 sonar position Detection circuit (position detection means) 7 Control circuit (simulated reflected wave generation means) 8 Delay circuit (first delay circuit, simulated reflected wave generation means) 9 Delay circuit (second delay circuit, simulated reflected wave generation means) 10 Gain control circuit (first gain control circuit, gain control circuit, simulated reflected wave generation means) 11 Gain control circuit (second gain control circuit, gain control circuit, simulated reflected wave generation means) 12 Addition circuit (direct wave generation means) 13 amplifier circuit 14 sound wave radiator (second sound wave radiator, simulated reflected wave generation means)

Claims (7)

[Claims] 1. A sound field simulation device for simulating a test environment of a sound source detection device, comprising: a direct wave generation device for generating a direct wave directly reaching the sound source detection device based on a signal from a sound source signal generation means. Means for generating a reflected wave in a simulation target environment of a sound wave based on a signal from a sound source signal generating means. 2. The sound field simulation device according to claim 1, further comprising a plurality of simulation reflection wave generation means. 3. A simulated reflected wave generating means for detecting a position of the sound source detecting device as viewed from a sound source, wherein the simulated reflected wave generating means detects a position of the sound source detecting device detected by the position detecting means and a position of the sound source in the simulated target environment. 3. The sound field simulation device according to claim 1, wherein a simulation reflection wave is generated according to a reflection position of the sound wave. 4. A simulated reflected wave generating means, comprising: a first delay circuit for delaying a signal from a sound source; a second delay circuit for delaying a signal from a sound source; and a gain of an output signal of the first delay circuit. A first gain control circuit that performs adjustment; a second gain control circuit that performs gain adjustment of an output signal of the second delay circuit; and a first that emits a sound wave corresponding to an output of the first gain control circuit.
And a second radiator that emits a sound wave according to the output of the second gain control circuit.
A first delay circuit and a position of a sound source detecting device, a reflection position of a sound wave in a simulation target environment, and a relative position between the first sound wave radiator and the second sound wave radiator. 4. The sound field simulating device according to claim 3, further comprising a control circuit for determining a delay amount of the second delay circuit and gains of the first gain control circuit and the second gain control circuit. 5. The direct wave generating means has an adding circuit for adding a signal from the sound source signal generating means and an output signal of the first gain control circuit. 5. The sound field simulating apparatus according to claim 4, wherein an output of the adding circuit is input so as to be used also as a sound wave radiator for the sound field. 6. The first delay circuit and the second delay circuit so that a sound wave from the first sound wave radiator and a sound wave from the second sound wave radiator reach the sound source detecting device at the same time. The sound field simulation device according to claim 4, wherein the delay amount is adjusted. 7. The control circuit according to claim 1, wherein the sound wave radiator installed on a side close to a path to a sound source detection device of a combined wave of the sound wave from the first sound wave radiator and the sound wave from the second sound wave radiator. 7. The sound field simulator according to claim 6, wherein the gain of the corresponding gain control circuit is increased.