JP4219719B2 - Imaging device with speaker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an imaging device with a speaker constituted by an imaging device and a speaker.
[0002]
[Prior art]
As an apparatus provided with a speaker that emits sound for the purpose of, for example, alerting an imaging target location to an imaging device capable of remotely monitoring an image being captured by a video monitor or the like, for example, a speaker and An image pickup device having a lens and a camera is known that is mounted on a turntable. As a speaker, a dynamic speaker is usually used.
[0003]
This imaging device with a speaker is operated in combination with the following additional means.
A side on which a monitoring unit such as a video monitor is provided is a monitoring side, and an imaging device with a speaker is installed, and a side to be monitored is a monitored side.
On the monitoring side, a video monitor, a microphone, an operation panel for operating the imaging device, and the like are provided. On the monitored side, an imaging device with a speaker and an amplifier for amplifying an audio signal from a microphone are provided. The microphone-amplifier-speaker is connected by means of audio signal transmission.
[0004]
Next, the operation will be described.
The monitored video captured by the imaging device is monitored by a remote video monitor, and in some cases, an audio signal is sent from the monitoring microphone for the purpose of alerting. The audio signal input from the microphone is amplified by the amplifier and sent to the speaker of the imaging device with the speaker, and the sound is radiated from the speaker to the monitored side.
[0005]
The above prior art is a technique generally known to those skilled in the art, and does not relate to a known literature invention.
[0006]
[Problems to be solved by the invention]
In conventional imaging devices with speakers, dynamic speakers are usually used as the speakers, so the sound emitted from the speakers is radiated outside the field of view range captured by the imaging device, and therefore the target to be alerted There is a problem that sound is radiated not only in the range but also in a range where it is not necessary to call attention.
[0007]
The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain an imaging device with a speaker that can emit sound with high directivity within a range of an imaging field angle of the imaging device. And
[0008]
[Means for Solving the Problems]
An imaging device with a speaker according to the present invention includes an imaging device having a lens and a camera, a superdirectional speaker having a printed circuit board and a plurality of ultrasonic transducers arranged on the printed circuit board , an imaging device, and a superdirectional speaker. A turntable that is mounted integrally and rotates the imaging direction of the image pickup device and the audible sound emission direction of the super-directional speaker in an arbitrary direction, and an operation panel that operates the rotation direction of the turntable. In the portion where the imaging range of the imaging device and the audible sound radiation area of the superdirective speaker all overlap, the central axis in the imaging range and the central axis in the radiation area overlap, The angle of view that is the angle of the imaging range is the same as the angle indicated by the audible sound radiation area in the superdirective speaker, and the radiation area is the sound pressure from the central axis of the radiation area. Bell is obtained by the radiation region of the audible sound until reduced to -6 dB.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below.
Embodiment 1 FIG.
1A and 1B are diagrams showing a schematic configuration of an imaging apparatus 1 with a speaker according to Embodiment 1 of the present invention. FIG. 1A is a left side view, FIG. 1B is a front view, and FIG. ) Is a right side view. FIG. 2 is an explanatory diagram showing the configuration of the imaging device 1 with a speaker and additional means for operating the same. FIG. 3 is an explanatory diagram showing a configuration of an audio driving device of the imaging device 1 with a speaker. FIG. 4 is a diagram schematically showing the imaging angle of view of the camera and the sound radiation range of the super-directional speaker of the imaging apparatus 1 with the speaker, and shows the super-directional speaker 1 and its vicinity as viewed from above.
[0010]
An imaging device with a speaker (hereinafter also simply referred to as a device) 1 includes a super-directional speaker 2 and an imaging device 3 mounted on a turntable 4. In the superdirective speaker 2, a plurality of ultrasonic transducers 2b are arranged on a printed circuit board 2a, and the outer periphery of the aggregate of the ultrasonic transducers 2b has a substantially circular shape. The image pickup device 3 includes a lens 3a and a camera 3b.
[0011]
Next, the device 1 and additional means for operating it will be described.
The monitoring side is referred to as monitoring side A, and the side to be imaged and the side from which sound is emitted and the side on which the apparatus 1 is installed is referred to as monitored side B.
There is a video monitor 10 on the monitoring side A, and an image captured by the apparatus 1 can be monitored on the monitoring side A away from the monitored side B. On the monitoring side A, a microphone 11 for outputting sound, an operation panel 12 for operating the apparatus 1, and a modulator 13 for modulating an audio signal input from the microphone 11 are arranged.
[0012]
The modulator 13 includes a carrier wave generation unit 13a that generates a carrier wave belonging to the ultrasonic band, a multiplication unit 13b that multiplies the audible band audio signal input from the microphone 11 and the carrier wave generated by the carrier wave generation unit 13a, and a multiplication unit. And an acoustic radiation controller 13c for controlling the acoustic radiation characteristics of the signal output from 13b.
[0013]
On the monitored side B, an amplifier 14 that receives and amplifies an audio signal via the modulator 13 and an apparatus 1 are arranged. The audio signal input to the amplifier 14 is input to the superdirective speaker 2 of the apparatus 1 and directionally radiated to the monitoring target location on the monitored side B. The microphone 11, the modulator 13, the amplifier 14, and the superdirective speaker 2 are connected by an audio signal transmission unit.
[0014]
Here, the imaging angle of view captured by the camera 3b and the range in which the sound of the superdirective speaker 2 is radiated are set as follows, and the sound is emitted limited to the range of the image monitored by the video monitor 10. To be able to.
In the portion where the range (hereinafter referred to as range) a captured by the camera 3b of the image pickup device 3 of the apparatus 1 and the region (hereinafter referred to as region) b where the superdirective speaker 2 emits audible sound substantially overlaps, the center in the range a The axis a-0 and the central axis b-0 of the region b are all set so as to overlap.
4 is a diagram showing the device 1 and the vicinity thereof, the range a and the region b, and the central axes a-0 and b-0 do not overlap, but from the device 1 to the location to be monitored. When viewed as a whole image having a certain distance, the range a and the region b and the central axes a-0 and b-0 are substantially overlapped.
[0015]
In addition, the imaging field angle that is the angle of the range a at this time is set to be substantially the same as the angle indicated by the region b, and the sound pressure level from the central axis b-0 is -6 dB in the region b. This is the audible sound radiation area until the noise level drops.
Here, when the diameter of superdirective speaker 2 is about 20 cm and the carrier frequency is 40 mHz, a directivity angle of about 20 degrees (angle of region b) was obtained.
[0016]
Next, the operation will be described.
A monitor (not shown) on the monitoring side A operates the operation panel 12, rotates the turntable 4 of the device 1 to pick up an image of the place to be monitored by the image pickup device 3, and the image sent from the device 1 is monitored by the video monitor. 10 to monitor. At this time, if necessary, sound is sent from the microphone 11 to the monitoring target location in the image range displayed on the video monitor 10 for the purpose of alerting and the like, and directional radiation is emitted to the above-described monitoring target location.
[0017]
The operation of the voice system is performed as follows.
An audible audio signal input from the microphone 11 is input to the modulator 13. In the modulator 13, a carrier wave in the ultrasonic band is generated by the carrier wave generation unit 13 a, and the audible audio signal input from the microphone 11 is multiplied by the multiplication unit 13 b, and the multiplied signal is sent to the acoustic radiation controller 13 c. And output from the modulator 13.
The signal output from the modulator 13 is input to the amplifier 14 to be amplified and input to each of the multiple ultrasonic transducers 2b. The input signal is output from the superdirective speaker 2 to the video monitor 10 as an audio announcement. Directionally radiated to the monitored location in the image range to be reflected.
[0018]
The carrier wave generated by the carrier wave generator 13a becomes an ultrasonic wave when it is radiated from the ultrasonic transducer 2b of the superdirective speaker 2, and exhibits a sharp directivity. Therefore, the audible sound signal multiplied by the carrier wave also has a sharp directivity. It is radiated as a voice announcement by sex. Since the ultrasonic wave is a non-audible sound, even if it is multiplied by the audible sound, it does not interfere with listening on the monitored side.
[0019]
Further, by making the frequency of the signal output from the carrier wave generation unit 13a coincide with the resonance frequency of the ultrasonic transducer 2b, the superdirective speaker 2 can reproduce high-level ultrasonic waves. That is, sound waves in the audible sound band are generated by the non-linear phenomenon of high-level ultrasonic waves reproduced from the superdirective speaker 2.
[0020]
At this time, the central axis a-0 of the range a and the central axis b-0 of the region b are set to overlap with each other, and the imaging field angle and the angle indicated by the region b are substantially the same angle. In addition, since the area b is an audible sound emission area from the central axis b-0 to the sound pressure level of -6 dB, the audible sound radiated in a range other than the range a is a sound smaller than -6 dB. There is no risk of noise. Therefore, the alerting sound can be emitted only within the range a of the imaging field angle of the imaging device 3 (the range of the image monitored by the video monitor 10).
The apparatus 1 having the above-described configuration can be used in various applications. For example, in the vicinity of a building (thermal power plant, nuclear power plant, etc.) where entry is prohibited, Can be used.
[0021]
As described above, according to the imaging apparatus 1 with the speaker of the first embodiment, the imaging apparatus 3 and the superdirective speaker 2 with high directivity are configured. Therefore, imaging with the camera 3b of the apparatus 1 is performed. It is possible to obtain an effect that the sound for alerting can be emitted from the superdirective speaker 2 only in the range a of the angle of view.
Further, the center axis a-0 of the range a and the center axis b-0 of the area b are set to overlap, and the imaging field angle and the angle indicated by the area b are substantially the same angle, Since the region b is an audible sound emission region from the central axis b-0 to the sound pressure level of -6 dB, it is possible to emit a sound limited to the range a with high accuracy. It is done.
[0022]
Here, the modulator 13 is arranged on the monitoring side A and the amplifier 14 is arranged on the monitored side B, but this means that there is a certain transmission distance between the monitoring side A and the monitored side B. It is a premise. When the transmission distance between the monitoring side A and the monitored side B is long, there is a risk of transmission loss, noise, etc., so the modulator 13 uses the monitoring side A and the amplifier 14 as the monitored side B. It is not limited.
[0023]
【The invention's effect】
As described above, according to the present invention, an imaging device having a lens and a camera, a superdirectional speaker having a printed circuit board and a plurality of ultrasonic transducers arranged on the printed circuit board , an imaging device and a superdirectional speaker, A rotating table for rotating the imaging direction of the imaging device and the radiation direction of the audible sound of the super-directional speaker in an arbitrary direction, and an operation panel for operating the rotating direction of the rotating table; In the portion where the imaging range of the imaging device and the audible sound emission region of the superdirective speaker all overlap, the central axis in the imaging range and the central axis in the emission region overlap, and the imaging device The angle of view, which is the angle of the imaging range, and the angle indicated by the audible sound radiation area in the superdirective speaker are the same angle, and the sound pressure level from the central axis of the radiation area is the sound pressure level. Since it is configured speaker with imaging device and the radiation area of the audible sound to be reduced to 6 dB, and limited to the range of the image pickup angle of view imaged by the imaging device, emits sound for alert ultra directional speaker There is an effect that an imaging device with a speaker that can be obtained is obtained.
[Brief description of the drawings]
FIG. 1 is a diagram showing a schematic configuration of an imaging apparatus with a speaker according to Embodiment 1 of the present invention.
FIG. 2 is an explanatory diagram showing a configuration of an imaging device with a speaker and additional means for operating the imaging device.
FIG. 3 is an explanatory diagram illustrating a configuration of an audio driving device of an imaging device with a speaker.
FIG. 4 is a diagram schematically illustrating an imaging field angle of a camera and a sound radiation range of a super-directional speaker of an imaging apparatus with a speaker.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Imaging device with a speaker, 2 Super directional speaker, 2a Printed circuit board, 2b Ultrasonic transducer, 3 Imaging device, 3a Lens, 3b Camera, 4 Turntable, 10 Video monitor, 11 Microphone, 12 Operation panel, 13 Modulator , 13a Carrier generation unit, 13b multiplication unit, 13c acoustic emission controller, 14 amplifier, A monitoring side, B monitored side, a range captured by the camera, b super directional speaker radiating audible sound, a- 0 Central axis of range a, b-0 Central axis of region b.

Claims (1)

An imager having a lens and a camera;
A super-directional speaker having a printed circuit board and a plurality of ultrasonic transducers arranged on the printed circuit board ;
The imaging device and the superdirective speaker are integrally mounted, and a turntable for rotating the imaging direction of the imaging device and the radiating direction of the audible sound of the superdirectional speaker in an arbitrary direction,
An operation panel for operating the rotation direction of the turntable,
In the portion where the imaging range of the imaging device and the audible sound radiation area in the superdirective speaker all overlap, the central axis in the imaging range and the central axis in the radiation area overlap,
The angle of view that is the angle of the imaging range of the imaging device and the angle indicated by the audible sound radiation area in the superdirective speaker are the same angle, and the radiation area is sounded from the central axis of the radiation area. An imaging device with a speaker , characterized in that an audible sound emission region until the pressure level decreases to -6 dB .

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