JP2776664B2 - Interference sound processor for sonar - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention
For an active sonar device that receives and processes the reverberation sound of an underwater target, monitors the screen display and monitors the sound, it removes the interference sound mixed into the reception band among the sound waves emitted by other active sonar devices into the water. The present invention relates to an interference sound processing device.

[0002]

2. Description of the Related Art Conventionally, in an interference sound blanking processing circuit, as shown in FIG. 5, a sound wave is emitted into water by a transmitter / receiver 103 to receive a reverberation sound of an underwater target object 102, and a sound of another active sonar. The transducer 101 also receives sound waves emitted underwater, and the received signal S ₁ is band-limited by the filter 105, processed by the acoustic signal processing circuit 106, and displayed on the display 118 as video data S ₇ and audio data S _8.
And a sound output to the sound monitor 119.

[0003]

In the above-described conventional interference sound blanking processing circuit, if a sound wave from another transmitter / receiver is a signal in a reception band, the sound wave cannot be removed by a filter and becomes a video signal as an interference sound. There has been a problem that the display and the sound are monitored, which hinders recognition of the underwater target.

[0004]

An object of the present invention is to provide an interference sound processing apparatus for a sonar capable of improving the disadvantages of the conventional example and effectively eliminating reception of an interference wave from another transmitter / receiver and performing a good sound monitoring. Its purpose is to provide.

[0005]

SUMMARY OF THE INVENTION Therefore, according to the present invention, there is provided a reference signal for outputting a predetermined interference sound reception signal when the level of a signal received by another transmitter / receiver from another transmitter / receiver is equal to or higher than a reference level. A plurality of channels having a level determination circuit;
An adding circuit that counts the number of channels that output the interference sound reception signal when each reference level determination circuit outputs the interference sound reception signal; and a predetermined reference channel number that is the number of channels added by the addition circuit. A reference channel determination circuit that outputs an interference sound detection command signal when
A sonar interference sound processing apparatus, comprising: a first multiplex that operates based on an interference sound detection command signal from a reference channel determination circuit and sets video data to a zero level while the interference sound is being detected. And the said
Interference sound is detected in synchronization with the 1 multiplexer
Those sets the audio data between the zero level
Spike-like click sound before and after setting to the zero level
, And a second multiplexer for each of a plurality of channels. This aims to achieve the above-mentioned object. The present invention
Now, set the video data during the interference sound detection period to zero level.
In addition to not being able to recognize on the video,
Set the audio data to zero level and listen
The interference sound is removed by making it invisible. Departure
The audio data to zero level with the configuration
And the audio level pole at the
A spike-like click sound is generated due to a sharp change.
This informs the monitor that the interference sound has been removed.
You. In the invention according to claim 2, the reference channel determination circuit
Down cow to set blanking period based on output
Counter and the down counter to this down counter.
A reference value circuit for setting a value n (n is an integer of 2 or more);
Audio for a predetermined blanking period
Provide multiple buffers to bring data to zero level
Thus, the generation of the spike noise is prevented. In FIG.
As shown, for example, when n = 3, the down counter 1
Until the count value of 1 becomes “0”, the blanking signal
Video data and
And audio data are zero level before and after the interference sound.
You.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. The embodiment shown in FIGS. 1 and 2 has a reference level for outputting a predetermined interference sound reception signal when the level of a reception signal from another transmitter / receiver 1 received by the transmitter / receiver 3 is equal to or higher than the reference level. A plurality of channels including a determination circuit, and a channel for outputting the interference sound reception signal when each reference level determination circuit outputs the interference sound reception signal.
An addition circuit 8 for counting the number of channels, and a reference channel determination circuit 9 for outputting an interference sound detection command signal when the number of channels added by the addition circuit 8 is equal to or greater than a predetermined reference channel number. ing. It operates based on the interference sound detection command signal from the reference channel determination circuit 9,
A first multiplexer 12 that sets video data to a zero level while the interference sound is being detected and a second multiplexer 17 that sets audio data during the same period to a zero level include a plurality of multiplexers. Equipped for each channel.

More specifically, in FIG. 1, in FIG. 1, the transducer 3 emits a sound wave into the water, receives the reverberation sound of the underwater target 2, and the other transducer 1 emits the water. It also receives sound waves. Of the received signals, the sound wave emitted into the water by the other transducer 1 is a direct propagation signal that is not a reverberant sound, and therefore has a very high reception level, and the transducer 3 becomes a saturated reception signal.

In each channel, the band of the received signal S ₁ is limited by the filter 5. However, if the frequency of the sound wave emitted into the water by the transmitter / receiver 1 is within this band, it cannot be removed and remains as interference sound.

Next, the audio signal processing circuit 6 performs signal processing on the band-limited received signal, and sends out video data S ₂ and audio data S ₃ . In the reference level determination 7, whether the level of the video data S ₂ is a saturated level with a reference level, and determines whether the reference level or higher.
As a result, the sum of the number of channels at or above the reference level is obtained by the adding circuit 8, and whether or not the value is at least the reference channel number is determined by the reference channel determining circuit 9. To detect.

If an interference sound is detected, the video data S ₂ is converted to zero-level video data S ₇ by the first multiplexer 12 during the interference sound detection period of the output of the reference channel determination circuit 9, and blanked on the display 18. In addition to displaying the image as (a state that cannot be recognized on the image), the audio data S ₃ is blanked by the second multiplexer 17 as audio data S ₈ at the audio monitor S 19 as a zero-level audio data S ₈ (a state in which almost no sound can be heard). Output.

That is, the video data during the interference sound detection period is set to zero level so that it cannot be recognized on the image, and the audio data during the same period is set to zero level so that almost no audible sound can be heard. Remove the sound. Here, the state in which almost no sound can be heard as a hearing sound is a state in which a spike-like click sound generated due to an extreme change in the audio level remains at an interference sound switching point where the audio data is set to zero level, and is heard. Say.

[0012] Figure 2 is a timing of the embodiment shown in FIG. 1, interference noise generation period of the received signal S _1, the video data S ₇ to zero level, although the audio data S ₈ a zero level, audio remains spike clicking sound, caused by extreme changes in level at the point switches interference noise for data S _8, it is fastened to the extent聴知.

FIG. 3 shows another embodiment, and FIG. 4 shows an example of the timing.

In the embodiment shown in FIG. 3, similarly to the embodiment shown in FIG. 1, the level of the signal received by the transmitter / receiver 3 from another transmitter / receiver 1 is higher than the reference level. A plurality of channels each including a reference level determination circuit 7 that outputs a predetermined interference sound reception signal in the case of; an addition circuit 8 that counts the number of each reference level determination circuit 7 when each reference level determination circuit 7 outputs an interference sound reception signal. A reference channel determination circuit 9 for outputting an interference sound detection command signal when the number of channels added by the addition circuit 8 is equal to or greater than a predetermined reference channel number.

Further, a down counter 11 for setting a blanking period based on the output of the reference channel determination circuit 9 is provided. A first multiplexer 12 that operates based on an interference sound detection command signal from the reference channel determination circuit 9 and sets video data to a zero level while the interference sound is being detected; A first buffer 13 for storing the video data of n, a second buffer 14 for storing the n-2nd video data and a blanking signal output from the down counter 11, and a storage for the n-1st audio data. A third buffer 15 and a fourth buffer 1 for storing the (n-2) th audio data
6 and a second multiplexer 17 for setting the output of the fourth buffer 16 to a zero level during the blanking signal output period of the second buffer 14 for each of a plurality of channels. It has a clock generator 20 for timing.

More specifically, referring to FIG. 3, the transmitter / receiver 3 emits a sound wave into the water to receive the reverberation sound of the underwater target 2 and also receives the sound wave emitted from the transmitter / receiver 1 into the water. Resulting in. Among the received signals, the sound wave emitted into the water by the other transducer 1 is a directly propagated signal that is not a reverberant sound, and therefore has a very high reception level and becomes a received signal saturated by the transducer 3. In each channel, the band of the received signal S ₁ is limited by the filter 5. If the frequency of the sound wave emitted into the water by the other transmitter / receiver 1 is within this band, the sound cannot be removed and remains as an interference sound.

Next, the audio signal processing circuit 6 performs signal processing on the band-limited received signal, and sends out video data S ₂ and audio data S ₃ . In the reference level determination circuit 7, bidets 0 level data S ₂ compares whether the saturation level with a reference level, and determines whether the reference level or higher. As a result, the adder 8 calculates the total number of channels that were equal to or higher than the reference level, and the reference channel determination circuit 9 determines whether the value is equal to or higher than the reference channel number. Detect as sound. When an interference sound is detected, the value defined in the reference value output circuit 10 is used.
n (“3” in the example shown in FIG. 1)
And the first multiplexer 12 sets the level of the video data to the zero level. In the down counter 11, the count value and outputs a blanking signal S ₅ until 0. That is, the value n is
This defines the time for outputting the signal.

The first buffer 13 stores the (n-1) th video data (n is an integer, 2 or more, the same applies hereinafter) in the first buffer 13, and the (n-2) th video data and the blanking signal S in the second buffer 14. and ₅ entrapment, the third in the buffer 15 n-1 th audio data, save up to fourth in the buffer 16 n-2-th audio data. Each of these buffers 13 to 15 is a clock generator 2
By 0 of the clock S _4, the sequential shift the contents that hoarding. That is, the first buffer 13 by the clock S ₄
Into the second buffer 14 and the third buffer 15
Is transferred to the fourth buffer 16.

Here, assuming that the time when the interference sound is detected is i-th (i is an integer, the same applies hereinafter), the i-th clock S ₄
The zero level video data output from the first multiplexer 12 is stored in the first buffer 13 at the timing of
The second buffer 14 stores video data output from the first buffer 13, the third buffer 15 stores audio data S ₃ , and the fourth buffer 16 stores audio data output from the third buffer 15. At the same time, the count value of the down counter 11 is counted down by one.
As a result, the video data S ₇ of the output of the second buffer 14 in which the value of the down counter 11 becomes “2” is displayed on the display 18 as an image, and the blanking signal S ₆ is transmitted to the second multiplexer 17. Then, the audio data output from the fourth buffer 16 is output as audio data S ₈ of zero level by the second multiplexer 17 to the audible sound monitor 19 as a blanking sound (a state in which the audible sound cannot be heard).

[0020] i + 1-th processed result, if not detected interference sound, the clock S at the timing of ₄ into the first buffer 13 entrapment as the value of the video data, the second buffer 14 of the zero-level video the blanking signal S ₅ values and the down counter 11 outputs the data entrapment and 1 down-count value of the down counter 11.
As a result, the count value of the down counter 11 becomes “1”. Similarly, the shifted audio data is stored in the third buffer 15 and the fourth buffer 16. Accordingly, the zero level video data S ₇ of the output of the second buffer 14 is displayed on the display 18 as blanking (a state in which the video data cannot be recognized), and the blanking signal S ₆ is displayed on the second multiplexer 17. Then, the audio data output from the fourth buffer 16 is output as a zero-level audio data S ₈ by the second multiplexer 17 to the audible sound monitor 19 as a blanking sound (a state in which the audible sound cannot be heard).

As a result of the (i + 2) th processing, if no interference sound is detected, the value of the video data is stored in the first buffer 13 at the timing of the clock S ₄ , and the value of the video data is stored in the second buffer 14. Down counter 11
Entrapment blanking signal S ₅ outputs, to 1 down-counting the count value of the down counter 11. As a result, the value of the down counter 11 becomes “0”. Similarly, the shifted audio data is stored in the third buffer 15 and the fourth buffer 16. Therefore, the video data S ₇ of the output of the second buffer 14 is displayed on the display 18.
And the blanking signal S ₆ is output to the second multiplexer 17, and the audio data output from the fourth buffer 16 is blanked by the second multiplexer 17 as zero-level audio data S _{8 on} the audio monitor 19. (A state that cannot be heard as a sound) is output as a sound.

[0022] i + 3-th processed result, if not detected interference sound as entrapment values of video data in the first buffer 13 at the timing of the clock S _4, the value of the video data in the second buffer 14 Earn money. At this time,
Count value of the down counter 11 does not output a blanking signal S ₃ for a "0", the count value also remains "0". Third buffer 15 and fourth buffer 1
Similarly, the shifted audio data is stored in the sixth audio data.
Therefore, the video data S ₇ of the output of the second buffer 14 is displayed on the display 18 as an image, and the fourth buffer 16
The output audio data is output to the audio monitor 19 as the audio data S ₈ of the same value by the second multiplexer 17.

That is, the video data during the interference sound detection period is set to zero level so that it cannot be recognized on the image, and the audio data during the period including before and after the interference sound detection is set to zero level so that the sound cannot be heard as a listening sound. To remove the interference sound. Here, the reason why the audio data during the period including before and after the detection of the interference sound is set to the zero level is to remove a spike-like click sound generated at an interference sound switching point (a state where the level is extremely changed).

FIG. 4 is a timing of the embodiment shown in FIG. 3, the interference noise generation period of the received signal S ₁ (clock to 4
I with respect to the i-th (i + 1) th), blanking signal S ₆ generates period from the i-th i + 3-th clock S _4, the video data S ₇ from i + 1 th clock S ₄
The level becomes zero level during the second period, and the audio data S
₈ consists of i-th clock S ₄ and i + 3-th period zero level.

[0025]

As described above, according to the present invention, the interference sound in the active sonar device is detected, the level of the video data and audio data in that period is set to zero level, and only the click sound is removed while eliminating the interference sound. Leave
Therefore, interference sound can be recognized on the video display and the audio monitor.
And no longer be heard, and that interference noise has been removed.
According to the second aspect, the level of the audio data in the period including the period before and after the detection of the interference sound can be set to zero level, and the click sound at the time of removing the interference sound in the listening sound can be removed. And, by removing the interference sound in this way, it is possible to improve the detection efficiency by eliminating the obstruction on the image display and the audio sound monitor for recognizing the underwater target, and at the same time, in the operation by a plurality of active sonar devices, It is possible to provide an unprecedented excellent sonar interference sound processing device that can eliminate mutual influences.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is a timing chart showing the operation of the embodiment shown in FIG.

FIG. 3 is a block diagram showing another embodiment of the present invention.

FIG. 4 is a timing chart showing the operation of the embodiment shown in FIG.

FIG. 5 is a block diagram showing a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 other transducer 2 underwater target 3 transducer 4 transmitter circuit 5 filter 6 acoustic signal processing circuit 7 reference level determination circuit 8 addition circuit 9 reference channel determination 10 reference value (+3) output circuit 11 down counter 12 first 13 Multiplexer 13 First Buffer 14 Second Buffer 15 Third Buffer 16 Fourth Buffer 17 Second Multiplexer 18 Display 19 Hearing Monitor 20 Clock Generator

Continuation of the front page (72) Inventor Yuji Kawamoto 3-20-4 Nishishinbashi, Minato-ku, Tokyo Japan Electric Engineering Co., Ltd. (56) References JP-A-1-233384 (JP, A) JP-A-55- 1540 (JP, A) JP-A-63-19581 (JP, A) JP-A-54-159260 (JP, A) JP-A-62-168078 (JP, A) JP-B-60-44627 (JP, B2) JP-B-63-63075 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) G01S 3/80-3/86 G01S 7/52-7/64 G01S 15/00-15 / 96

Claims (2)

(57) [Claims] A plurality of channels provided with a reference level determination circuit for outputting a predetermined interference sound reception signal when a level of a reception signal from another transmitter / receiver received by the transmitter / receiver is equal to or higher than a reference level; Output the interference sound reception signal when each of the reference level determination circuits outputs the interference sound reception signal.
For a sonar including an addition circuit for counting the number of channels, and a reference channel determination circuit for outputting an interference sound detection command signal when the number of channels added by the addition circuit is equal to or greater than a predetermined reference channel number . Interference sound processor
In operates based on the interference sound detection command signal from the reference channel determination circuit, a first multiplexer to set the zero level of the video data while the interference noise is detected, the first The interference sound synchronized with the multiplexer
Audio data is set to zero level during the detection of , and spy before and after setting to zero level.
A second multiplexer for generating a click-like click sound is provided for each of the plurality of channels. 2. A plurality of channels comprising a reference level determination circuit for outputting a predetermined interference sound reception signal when a level of a reception signal from another transmitter / receiver received by the transmitter / receiver is equal to or higher than a reference level. Output the interference sound reception signal when each of the reference level determination circuits outputs the interference sound reception signal.
For a sonar including an addition circuit for counting the number of channels, and a reference channel determination circuit for outputting an interference sound detection command signal when the number of channels added by the addition circuit is equal to or greater than a predetermined reference channel number . Interference sound processor
In a down counter for setting a blanking period based on the output of the reference channel determination circuit, the down counter
Reference value n for blanking period (n is an integer of 2 or more)
And a reference value circuit for setting video data to a zero level while operating based on the interference sound detection command signal from the reference channel determination circuit. A first buffer for storing the (n-1) th video data, a second buffer for storing the (n-2) th video data and the blanking signal of the down counter output, and an (n-1) th buffer. A third buffer for storing audio data, a fourth buffer for storing the (n-2) th audio data, and an output of the fourth buffer at a zero level during a blanking signal output period of the second buffer. a second multiplexer is set to be equipped in each of the plurality of channels, further, JP, further comprising a clock generator for timing the operation of these respective parts Sonar interference sound processing apparatus according to.