Noise cancellation device, noise cancellation method, and electronic device

Abstract

The present invention reduces degradation of reception sensitivity of a wireless reception unit due to radio noise.　Noise generated from a noise generating source is acquired by a noise acquiring unit. The phase and gain of the noise acquired by the noise acquiring unit are adjusted by a noise adjusting unit to obtain a noise cancellation signal. The noise cancellation signal obtained by the noise adjusting unit is transmitted by an antenna unit. For example, the noise generated from the noise generating source is acquired by the noise acquiring unit through reception by the antenna unit or via electric wiring.

Description

[Technical Field]

[0001] The present technology relates to a noise cancellation device, a noise cancellation method, and an electronic device, and more particularly to a noise cancellation device or the like that can reduce degradation of sensitivity of a wireless receiver due to radio wave noise. [Background technology]

[0002] The Internet of Things (IoT) has seen remarkable development in recent years, with a wide variety of wireless functions being incorporated into everything from everyday products to infrastructure equipment. These products and devices are multifunctional and compact, and equipped with a wide variety of wireless functions and antennas. In these cases, the characteristics of the wireless functions are directly linked to the product value, and wireless performance has become one of the important product specifications.

[0003] Under these circumstances, various LSI (Large Scale Integration) and other components inside products and devices generate noise, and this noise enters the frequencies used by wireless, degrading sensitivity and becoming a factor in degrading product characteristics.In addition, while noise sources are increasing due to the increasing number of functions in recent years, the number of receivers and antennas used to increase wireless functions, speeds, and coverage areas is also steadily increasing.

[0004] For example, Patent Document 1 proposes a radio that improves reception sensitivity by adjusting the phase, delay, and amplitude of noise extracted by a noise extraction means and feeding the result back to a demodulator. This radio has problems such as the need to trace a circuit pattern from the noise extraction means to the demodulator, which is disadvantageous in terms of board design, and the need to add an additional mixer, LNA (Low Noise Amplifier), and filter to the demodulator, which attenuates the desired signal to a considerable extent due to these additional circuits, resulting in a deterioration in sensitivity even when no noise is generated. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-176659 Summary of the Invention [Problem to be solved by the invention]

[0006] The purpose of this technology is to reduce the deterioration of sensitivity of a wireless receiving section caused by radio wave noise. [Means for solving the problem]

[0007] The concept of this technology is: a noise acquisition unit that acquires noise generated from a noise source; a noise adjustment unit that adjusts the phase and gain of the noise acquired by the noise acquisition unit to obtain a noise cancellation signal; an antenna unit that transmits a noise cancellation signal obtained by the noise adjustment unit; It's in the noise cancellation device.

[0008] In this technology, a noise acquisition unit acquires noise generated from a noise source. A noise adjustment unit adjusts the phase and gain of the noise acquired by the noise acquisition unit to obtain a noise-canceled signal. Then, the noise-canceled signal obtained by the noise adjustment unit is transmitted by an antenna unit.

[0009] In this way, this technology acquires noise generated from a noise source, adjusts the phase and gain of the noise, and transmits the resulting noise cancellation signal from the antenna. Therefore, noise generated by the noise source that affects the sensitivity of a specific wireless receiver can be effectively canceled, reducing degradation of the sensitivity of the wireless receiver due to radio noise. Furthermore, noise that reduces sensitivity in a specific wireless receiver can be canceled without adding additional circuitry to the specific wireless receiver. Furthermore, even if there are multiple specific wireless receivers, a single noise cancellation device can be used to address these issues.

[0010] In the present technology, for example, the noise acquisition unit may acquire noise generated from a noise source by receiving it with an antenna unit. In this case, the antenna unit can be effectively utilized and electrical wiring for acquiring noise from the noise source is not required, so that the noise cancellation device can be easily disposed in, for example, an electronic device. Furthermore, noise generated from multiple noise sources can also be acquired with a single antenna unit.

[0011] In this case, for example, a directional coupling unit may be provided that sends noise generated by a noise source and received by the antenna unit to the noise adjustment unit, and also sends a noise cancellation signal obtained by the noise adjustment unit to the antenna unit. By providing such a directional coupling unit, the antenna unit can be effectively used for both noise reception and noise cancellation signal transmission. For example, the directional coupling unit may be a circulator. This circulator can provide good directional coupling.

[0012] Furthermore, in the present technology, for example, the noise acquisition unit may acquire noise generated from a noise source through an electric wiring, which eliminates the need for a directional coupling unit as in the case where the antenna unit is also used for noise reception, and makes it possible to accurately acquire noise generated from a noise source of interest.

[0013] Furthermore, in the present technology, for example, the antenna unit may be arranged within a distance of 1 / 10 or less of the wavelength of a wireless signal to be received by a predetermined wireless receiving unit from a noise source. This makes it possible to minimize the phase shift between the noise and the noise cancellation signal, thereby improving cancellation accuracy, when noise that is generated by the noise source and affects the sensitivity of the predetermined wireless receiving unit is canceled by a noise cancellation signal transmitted from the antenna unit in antiphase to the noise.

[0014] In addition, in the present technology, for example, the noise adjustment unit may adjust the phase and gain of the noise acquired by the noise acquisition unit based on sensitivity information of a predetermined wireless receiving unit, thereby making it possible to adjust the phase and gain so that the sensitivity of the predetermined wireless receiving unit is always optimal.

[0015] In addition, in the present technology, for example, the noise source may be a noise source present in an electronic device equipped with a predetermined wireless receiving unit, such as a camera, and the noise cancellation device can thereby cancel noise that is generated from the noise source in the electronic device and affects the sensitivity of the predetermined wireless receiving unit.

[0016] Another concept of the present technology is a predetermined wireless receiving unit; a noise source that generates noise that affects the sensitivity of the predetermined wireless receiving unit; Equipped with a noise cancellation device The chair cancellation device is a noise acquisition unit that acquires noise generated from the noise generation source; a noise adjustment unit that adjusts the phase and gain of the noise acquired by the noise acquisition unit to obtain a noise cancellation signal; an antenna unit that transmits a noise cancellation signal obtained by the noise adjustment unit; It's in electronic devices.

[0017] The electronic device of the present technology includes a predetermined wireless receiving unit, a noise generating source that generates noise that affects the sensitivity of the predetermined wireless receiving unit, and a noise canceling device. In the noise canceling device, the noise generating source is acquired by a noise acquiring unit, the phase and gain of the noise acquired by the noise acquiring unit are adjusted by a noise adjusting unit to obtain a noise canceling signal, and the noise canceling signal obtained by the noise adjusting unit is transmitted by an antenna unit.

[0018] As described above, in this technology, the noise cancellation device acquires noise generated from a noise source, adjusts the phase and gain of the noise, and transmits the resulting noise cancellation signal from the antenna. Therefore, noise generated from the noise source that affects the sensitivity of a predetermined wireless receiver can be effectively canceled, thereby reducing degradation of the sensitivity of the wireless receiver due to radio noise. Furthermore, noise that degrades the sensitivity of a predetermined wireless receiver can be canceled without adding any circuitry to the predetermined wireless receiver. Furthermore, even if there are multiple predetermined wireless receivers, a single noise cancellation device can be used to address these issues. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 illustrates an example of the configuration of a camera according to a first embodiment. [Figure 2] FIG. 2 is a diagram illustrating a detailed configuration example of a camera. [Figure 3] FIG. 10 is a diagram showing an example of the arrangement position on the substrate of a radio noise canceller in a camera when the noise source that generates noise that affects the sensitivity of the wireless receiver is an LSI. [Figure 4] 1 is a diagram showing a state in which noise generated in a noise source and affecting the sensitivity of a wireless receiver is cancelled by a noise cancellation signal from a radio noise canceller; [Figure 5] 1 is a diagram illustrating how noise is canceled by a noise cancellation signal in a wireless receiver, and only the desired signal without noise becomes the final received signal. [Figure 6] FIG. 10 is a diagram illustrating an example of the configuration of a camera according to a second embodiment. [Figure 7] FIG. 10 is a diagram illustrating an example of the configuration of a camera according to a third embodiment. [Figure 8] FIG. 10 is a diagram showing an example of the arrangement position of a radio wave noise canceller on a substrate in a camera in which two noise sources that generate noise that affects the sensitivity of a wireless receiver are a main LSI and a sub-LSI. [Figure 9]FIG. 10 is a diagram illustrating an example of the configuration of a camera according to a fourth embodiment. [Figure 10] FIG. 10 is a diagram illustrating an example of a calculation section that calculates parameters used in a phase adjustment section and a gain adjustment section. [Figure 11] FIG. 10 is a diagram illustrating another example of a calculation section that calculates parameters used in a phase adjustment section and a gain adjustment section. [Figure 12] FIG. 10 is a diagram illustrating another example of a calculation section that calculates parameters used in a phase adjustment section and a gain adjustment section. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, modes for carrying out the invention (hereinafter referred to as "embodiments") will be described. The description will be made in the following order. 1. First embodiment 2. Second embodiment 3. Third Embodiment 4. Fourth Embodiment 5. Variations

[0021] <1. First embodiment> 1 shows an example of the configuration of a camera 100A according to the first embodiment. This camera 100A has wireless receivers 101 and 102, a noise generating source 103, and a radio noise canceller 104A as a noise canceling device.

[0022] The wireless receiver 101 is, for example, a Wi-Fi / BLUETOOTH receiver that has Wi-Fi communication and Bluetooth communication functions and is equipped with an antenna 101a. The wireless receiver 102 is, for example, a GPS (Global Positioning System) receiver and is equipped with an antenna 102a. Here, "Bluetooth" is a registered trademark. Note that although an example in which there are two wireless receivers is shown here, the number of wireless receivers is not limited to this and may be one, or three or more.

[0023] Noise source 103 is a part within camera 100A that generates noise (radio noise) that affects the sensitivity of wireless receivers 101 and 102. Noise source 103 is composed of one or more devices, such as an LSI that performs signal processing, control processing, etc., a DC-DC converter that constitutes a power supply, and an image sensor. Note that when multiple devices that are noise sources are included, radio noise canceller 104A may be added preferentially to a device that radiates a large amount of noise.

[0024] Radio wave noise canceller 104A has antenna 141, circulator 142 constituting a directional coupling section, phase adjustment section 143, and gain adjustment section 144.

[0025] Antenna 141 receives noise generated from noise source 103 and transmits a noise cancellation signal output from gain adjustment unit 144. Radio noise canceller 104A is disposed within camera 100A so that the distance d between antenna 141 and noise source 103 is 1 / 10 or less of the wavelength of the radio signal to be received by wireless receivers 101 and 102.

[0026] By arranging them in this manner, as will be described later, when noise generated by noise source 103 and affecting the sensitivity of wireless receivers 101 and 102 is canceled by a noise cancellation signal transmitted from antenna 141 in the opposite phase to the noise, the phase shift between the noise and the noise cancellation signal can be kept small, thereby improving the cancellation accuracy.

[0027] Circulator 142 sends noise received by antenna 141 to phase adjustment unit 143, and also sends a noise cancellation signal output from gain adjustment unit 144 to antenna 141. Note that instead of circulator 142, it is also possible to use another device that has a similar directional coupling function.

[0028] Phase adjustment unit 143 and gain adjustment unit 144 constitute a noise adjustment unit, which converts the noise sent from circulator 142 into an inverse phase and an appropriate gain to obtain a noise cancellation signal. Here, the parameters used for phase adjustment in phase adjustment unit 143 and the parameters used for gain adjustment in gain adjustment unit 144 are determined in advance (determined by experiments before or during design).

[0029] 1, noise generated from noise source 103 is received by wireless receivers 101 and 102. The noise generated from noise source 103 is also received by antenna 141 of radio noise canceller 104A.

[0030] In radio wave noise canceller 104A, the phase and gain of the received noise are adjusted by phase adjustment section 143 and gain adjustment section 144, and a noise cancellation signal having an opposite phase to the noise is generated and transmitted from antenna 141. The noise cancellation signal transmitted from antenna 141 is also received by wireless receivers 101 and 102.

[0031] In each of the wireless receivers 101 and 102, the received noise is cancelled by the received noise cancellation signal, thereby enabling the wireless receivers 101 and 102 to receive only the desired signal, and reducing (suppressing) degradation of reception sensitivity due to radio wave noise generated from the noise source 103.

[0032] Fig. 2 shows a detailed configuration example of the camera 100A, in which parts corresponding to those in Fig. 1 are given the same reference numerals.

[0033] The main LSI 120 performs various signal processing in the camera 100A, control processing of each part of the camera 100A, etc. The image sensor 122 captures an image of a subject via the camera lens 121. The sub LSI 123 performs predetermined processing on the image signal obtained by the image sensor 122 and then supplies the signal to the main LSI 120.

[0034] An LCD panel 124 and an electronic viewfinder 125 that constitute a display are connected to the main LSI 120. A reference clock 126 and a power supply 127 are also supplied to the main LSI 120. An external interface 128 such as an HDMI (High-Definition Multimedia Interface) or a USB (Universal Serial Bus) and an external storage device 129 such as a memory stick are also connected to the main LSI 120.

[0035] Furthermore, the main LSI 120 is connected to a Wi-Fi / BLUETOOTH receiver 101 having Wi-Fi communication and Bluetooth communication functions, and a GPS receiver 102 .

[0036] With regard to Wi-Fi communication, the Wi-Fi / BLUETOOTH receiver 101 transmits, for example, a captured image from the camera 100A to an external device, such as a PC (Personal Computer) or a smartphone, and receives a signal from the external device notifying the camera 100A that the captured image has been received.

[0037] For Bluetooth communication, the Wi-Fi / BLUETOOTH receiver 101 is used, for example, as a remote control for the camera 100A. For example, a smartphone can send a shooting instruction (shutter instruction) to the camera 100A, or can send an instruction to the smartphone to receive an image.

[0038] The GPS receiver 102 is used to acquire location information and to add information about the location where the image was taken (geotag, Exif data) to the image.

[0039] Camera 100A also has radio wave noise canceller 104A. As described in FIG. 1, radio wave noise canceller 104A generates a noise cancellation signal for canceling noise that is generated by a noise source in camera 100A and affects the sensitivity of Wi-Fi / BLUETOOTH receiver 101 and GPS receiver 102, and transmits the noise cancellation signal from antenna 141.

[0040] Fig. 3 shows an example of the arrangement position on the board of radio wave noise canceller 104A in camera 100A when LSI 130 is a noise source that generates noise that affects the sensitivity of Wi-Fi / BLUETOOTH receiver 101 and GPS receiver 102. In Fig. 3, parts that correspond to those in Fig. 2 are given the same reference numerals. Note that devices not shown in Fig. 2 are also arranged on the board shown in Fig. 3, but descriptions of these will be omitted here.

[0041] In this case, the radio noise canceller 104A is placed in the vicinity of the LSI 130 so that the distance d between its antenna 141 (see Figures 1 and 2) and the LSI 130, which is the noise source, is 1 / 10 or less of the wavelength of the radio signal to be received by the Wi-Fi / BLUETOOTH receiver 101 or the GPS receiver 102.

[0042] As a result, when noise that is generated in LSI 130, which is a noise source, and that affects the sensitivity of Wi-Fi / BLUETOOTH receiver 101 and GPS receiver 102, is canceled by a noise cancellation signal that is transmitted from antenna 141 in the opposite phase to the noise, the phase shift between the noise and the noise cancellation signal can be kept small, thereby improving the cancellation accuracy.

[0043] Furthermore, by arranging the radio wave noise canceller 104A, and therefore the antenna 141, in the vicinity of the LSI 130 in this manner, the antenna 141 can receive noise generated by the LSI 130 in a satisfactory manner.

[0044] FIG. 4 shows a schematic diagram of how, in the camera 100A shown in FIG. 1, noise generated by noise source 103 and affecting the sensitivity of wireless receivers 101 and 102 is canceled by a noise cancellation signal that is generated by radio noise canceller 104A based on the noise and transmitted from antenna 141 and has an opposite phase to the noise.

[0045] As described above, noise source 103 is, for example, an LSI that performs signal processing, control processing, etc., or a DC-DC converter that constitutes a power supply unit, an image sensor, etc. Whenever these devices are powered on, they generate noise with a frequency of, for example, several MHz to several tens of GHz, which affects the sensitivity of wireless receivers 101 and 102.

[0046] Incidentally, the radio signal frequencies used by Wi-Fi are 2.4 GHz, 5.2 GHz, etc., while the radio signal frequencies used by Bluetooth are also 2.4 GHz, and the radio signal frequencies used by GPS are 176.45 MHz, 1227.60 MHz, 1575.42 MHz, etc.

[0047] Noise generated from noise source 103 is received by wireless receivers 101 and 102. Noise generated from noise source 103 is also received by antenna 141 of radio noise canceller 104A.

[0048] In radio wave noise canceller 104A, a noise cancellation signal having an opposite phase to the noise is generated based on the received noise, and is transmitted from antenna 141. This noise cancellation signal transmitted from antenna 141 is also received by wireless receivers 101 and 102.

[0049] In each of the wireless receivers 101 and 102, the received noise is cancelled by the received noise cancellation signal, thereby reducing deterioration of reception sensitivity in the wireless receivers 101 and 102 due to noise generated from the noise source 103.

[0050] In the illustrated example, there are no other devices between the radio noise canceller 104A and the wireless receivers 101 and 102, but even if there are other devices between them, this will not affect the noise cancellation effect of the wireless receivers 101 and 102.

[0051] 5 shows a schematic diagram of how noise is cancelled by the noise cancellation signal in the wireless receivers 101 and 102, and only the desired signal without noise becomes the final received signal. In this case, even if noise is received along with the desired signal, by receiving the noise cancellation signal at the same time, the noise is cancelled by the noise cancellation signal, and ultimately only the desired signal remains.

[0052] As described above, the camera 100A shown in FIG. 1 has a radio wave noise canceller 104A, which acquires noise generated from the noise generating source 103, adjusts the phase and gain of the noise, and transmits the resulting noise cancellation signal from the antenna 141.

[0053] Therefore, noise generated from noise source 103 and affecting the sensitivity of wireless receivers 101, 102 can be effectively canceled, and deterioration of the reception sensitivity of wireless receivers 101, 102 due to radio wave noise can be reduced. Furthermore, noise that reduces the sensitivity of wireless receivers 101, 102 can be canceled without adding any circuitry to wireless receivers 101, 102. Furthermore, even if there are multiple wireless receivers (two wireless receivers 101, 102 in the example of FIG. 1), they can be handled with a single radio wave noise canceller 104A.

[0054] 1, radio wave noise canceller 104A acquires noise generated from noise generation source 103 by receiving it with antenna 141. This allows for effective use of antenna 141, and does not require electrical wiring to acquire noise from noise generation source 103, making it easy to arrange radio wave noise canceller 104A inside camera 100A.

[0055] 1, radio wave noise canceller 104A is provided with circulator 142 as a directional coupling unit that sends noise generated by noise source 103 and received by antenna 141 to phase adjustment unit 143 that constitutes the noise adjustment unit, and sends a noise cancellation signal obtained by gain adjustment unit 144 that constitutes the noise adjustment unit to antenna 141. Therefore, good directional coupling with antenna 141 can be achieved, and antenna 141 can be used effectively for both noise reception and noise cancellation signal transmission.

[0056] 1, the position of radio wave noise canceller 104A within camera 100A is determined so that distance d between antenna 141 and noise source 103 is equal to or less than 1 / 10 of the wavelength of the radio signal to be received by wireless receivers 101 and 102. Therefore, when noise that is generated by noise source 103 and affects the sensitivity of wireless receivers 101 and 102 is canceled by a noise cancellation signal transmitted from antenna 141 in antiphase to this noise, the phase shift between the noise and the noise cancellation signal can be kept small, making it possible to improve cancellation accuracy.

[0057] <2. Second Embodiment> 1, radio wave noise canceller 104A acquires noise generated by noise source 103 by receiving it with antenna 141. However, it is also possible to acquire noise generated by noise source 103 through electrical wiring.

[0058] Fig. 6 shows an example of the configuration of a camera 100B according to the second embodiment. In Fig. 6, parts corresponding to those in Fig. 1 are given the same reference numerals, and detailed descriptions thereof will be omitted where appropriate. This camera 100B has wireless receivers 101 and 102, a noise generating source 103, and a radio noise canceller 104B as a noise cancellation device.

[0059] Radio wave noise canceller 104B has antenna 141, phase adjustment unit 143, gain adjustment unit 144, and also has electrical wiring 105 for acquiring noise generated from noise generation source 103. Electrical wiring 105 includes a capacitor for blocking direct current.

[0060] 6, noise generated from noise source 103 is received by wireless receivers 101 and 102. Furthermore, in radio noise canceller 104B, noise generated from noise source 103 is acquired through electrical wiring 105.

[0061] In radio wave noise canceller 104B, the phase and gain of the acquired noise are adjusted by phase adjustment section 143 and gain adjustment section 144, and a noise cancellation signal having an opposite phase to the noise is generated and transmitted from antenna 141. The noise cancellation signal transmitted from antenna 141 is also received by wireless receivers 101 and 102.

[0062] In each of the wireless receivers 101 and 102, the received noise is cancelled by the received noise cancellation signal (see FIGS. 4 and 5). This allows the wireless receivers 101 and 102 to receive only the desired signal, and reduces deterioration of sensitivity due to noise generated from the noise source 103.

[0063] As described above, camera 100B shown in Fig. 6 has radio wave noise canceller 104B, which acquires noise generated from noise generation source 103, adjusts the phase and gain of this noise, and transmits the resulting noise cancellation signal from antenna 141. Therefore, similar to camera 100A shown in Fig. 1, it is possible to effectively cancel noise generated from noise generation source 103 that affects the sensitivity of wireless receivers 101 and 102, thereby achieving effects such as reducing deterioration in the reception sensitivity of wireless receivers 101 and 102 due to radio wave noise.

[0064] 6, radio wave noise canceller 104B acquires noise generated from noise source 103 through electrical wiring 105. Therefore, unlike when antenna 141 is used for both noise reception and reception, it is not necessary to provide a directional coupling unit such as a circulator, and it is possible to accurately acquire noise generated from noise source 103 of interest.

[0065] <3. Third Embodiment> 1 is an example in which there is one noise source of interest, but there may be cases in which there are multiple noise sources of interest.

[0066] Fig. 7 shows an example of the configuration of a camera 100C according to the third embodiment. In Fig. 7, parts corresponding to those in Fig. 1 are given the same reference numerals, and detailed descriptions thereof will be omitted where appropriate. This camera 100C has wireless receivers 101 and 102, noise generating sources 103a and 103b, and a radio noise canceller 104A as a noise cancellation device.

[0067] Antenna 141 of radio wave noise canceller 104A receives noise generated from noise sources 103a and 103b, and transmits a noise cancellation signal output from gain adjustment unit 144. Radio wave noise canceller 104C is disposed within camera 100C so that distances da and db between antenna 141 and noise sources 103a and 103b, respectively, are equal to or less than 1 / 10 of the wavelength of the radio signal to be received by wireless receivers 101 and 102.

[0068] By arranging them in this manner, as will be described later, when noise generated by noise sources 103a and 103b and affecting the sensitivity of wireless receivers 101 and 102 is canceled by a noise cancellation signal transmitted from antenna 141 in the opposite phase to the noise, the phase shift between the noise and the noise cancellation signal can be kept small, thereby improving the cancellation accuracy.

[0069] Fig. 8 shows an example of the layout position on the board of radio wave noise canceller 104A in camera 100C when two noise sources that generate noise that affects the sensitivity of wireless receiver (Wi-Fi / BLUETOOTH receiver) 101 and wireless receiver (GPS receiver) 102 are main LSI 120 and sub-LSI 123. In Fig. 8, parts corresponding to those in Fig. 3 are denoted by the same reference numerals.

[0070] In this case, the radio noise canceller 104A is placed in the vicinity of the main LSI 120 and the sub-LSI 123 so that the distances da and db between its antenna 141 (see Figures 1 and 2) and the main LSI 120 and the sub-LSI 123, respectively, are 1 / 10 or less of the wavelength of the radio signal to be received by the wireless receiver (Wi-Fi / BLUETOOTH receiver) 101 and the wireless receiver (GPS receiver) 102.

[0071] As a result, when noise generated by noise source 103 and affecting the sensitivity of wireless receiver (Wi-Fi / BLUETOOTH receiver) 101 or wireless receiver (GPS receiver) 102 is canceled by a noise cancellation signal transmitted from antenna 141 in the opposite phase to the noise, the phase shift between the noise and the noise cancellation signal can be kept small, thereby improving the cancellation accuracy.

[0072] 7, noise generated from noise sources 103a and 103b is received by wireless receivers 101 and 102. The noise generated from noise sources 103a and 103b is also received by antenna 141 of radio noise canceller 104A.

[0073] In radio wave noise canceller 104A, the phase and gain of the received noise are adjusted by phase adjustment section 143 and gain adjustment section 144, and a noise cancellation signal having an opposite phase to the noise is generated and transmitted from antenna 141. The noise cancellation signal transmitted from antenna 141 is also received by wireless receivers 101 and 102.

[0074] In each of the wireless receivers 101 and 102, the received noise is cancelled by the received noise cancellation signal (see FIGS. 4 and 5). This allows the wireless receivers 101 and 102 to receive only the desired signal, reducing degradation of sensitivity due to noise generated from both noise sources 103a and 103b.

[0075] As described above, camera 100C shown in Fig. 7 has radio wave noise canceller 104A, which acquires noise generated from noise generation sources 103a and 103b, adjusts the phase and gain of this noise, and transmits the resulting noise cancellation signal from antenna 141. Therefore, similar to camera 100A shown in Fig. 1, it is possible to effectively cancel noise generated from noise generation sources 103a and 103b that affects the sensitivity of wireless receivers 101 and 102, thereby achieving effects such as reducing deterioration in the sensitivity of wireless receivers 101 and 102 due to radio wave noise.

[0076] 7 shows an example in which camera 100C has two noise sources 103a and 103b, but it can also be configured in a similar manner when there are three or more noise sources. Furthermore, when there are two or more noise sources, it may be difficult to position radio wave noise canceller 104A so that the distance between each of them and antenna 141 of radio wave noise canceller 104A is 1 / 10 or less of the wavelength of the radio signal to be received by wireless receiver 101 or wireless receiver 102.

[0077] In that case, it is conceivable to place radio wave noise canceller 104A near the main noise source that significantly affects the sensitivity of radio receivers 101 and 102, so that the distance between the main noise source and antenna 141 of radio wave noise canceller 104A is at least 1 / 10 of the wavelength of the radio signal to be received by radio receiver 101 or radio receiver 102 or less.

[0078] <4. Fourth embodiment> In camera 100A shown in FIG. 1, adjustment parameters used in phase adjustment unit 143 and gain adjustment unit 144 of radio wave noise canceller 104A are predetermined (experimental values ​​determined before design). However, it is also possible to automate the phase and gain adjustments in the phase adjustment unit and gain adjustment unit of the radio wave noise canceller so that they are appropriate based on sensitivity information of wireless receivers 101 and 102. In this case, it is possible to adjust the phase and gain so that the sensitivity of wireless receivers 101 and 102 is always optimal. Here, sensitivity information is, for example, information on the ratio between noise waves and desired waves received by wireless receivers 101 and 102, so-called S / N information.

[0079] Fig. 9 shows an example of the configuration of a camera 100D according to the fourth embodiment. In Fig. 9, parts corresponding to those in Fig. 1 are given the same reference numerals, and detailed descriptions thereof will be omitted where appropriate. This camera 100D has wireless receivers 101 and 102, a noise generating source 103, and a radio noise canceller 104D as a noise cancellation device.

[0080] The phase adjustment unit 143D and the gain adjustment unit 144D of the radio noise canceller 104D correspond to the phase adjustment unit 143 and the gain adjustment unit 144, respectively, that constitute the radio noise canceller 104A in the camera 100A shown in FIG. 1, and perform phase adjustment and gain adjustment on the noise acquired by the antenna 141 to obtain a noise-canceled signal.

[0081] In this case, the phase and gain adjustments in phase adjustment unit 143D and gain adjustment unit 144D are performed based on sensitivity information of wireless receivers 101, 102. Specifically, phase adjustment unit 143D and gain adjustment unit 144D adjust the phase and gain using parameters calculated based on the sensitivity information of wireless receivers 101, 102 so as to optimize the sensitivity of those wireless receivers 101, 102.

[0082] For example, in order to calculate the parameters used in phase adjustment unit 143D and gain adjustment unit 144D, as shown in FIG. 10, radio noise canceller 104D may be provided with calculation unit 145 that calculates the parameters in phase adjustment unit 143D based on sensitivity information in wireless receivers 101 and 102, and calculation unit 146 that calculates the parameters in gain adjustment unit 144D based on sensitivity information in wireless receivers 101 and 102.

[0083] Furthermore, for example, in order to calculate the parameters used in the phase adjustment unit 143D and the gain adjustment unit 144D, as shown in FIG. 11, the radio noise canceller 104D may be provided with a calculation unit 147 that calculates both the parameters in the phase adjustment unit 143D and the parameters in the gain adjustment unit 144D based on the sensitivity information in the wireless receivers 101 and 102.

[0084] Furthermore, for example, it is also possible to calculate the parameters used in the phase adjustment unit 143D and the gain adjustment unit 144D in the main LSI 120 as shown in FIG.

[0085] It should be noted that the location where the parameters for adjustment used in phase adjustment section 143D and gain adjustment section 144D are calculated is not limited to the above example, and the parameters may be calculated in other locations.

[0086] 9, noise generated from noise source 103 is received by wireless receivers 101 and 102. The noise generated from noise source 103 is also received by antenna 141 of radio noise canceller 104D.

[0087] In radio wave noise canceller 104D, the phase and gain of the received noise are adjusted by phase adjustment section 143D and gain adjustment section 144D, and a noise cancellation signal having an opposite phase to the noise is generated. Here, phase adjustment section 143D and gain adjustment section 144D adjust the phase and gain using parameters calculated based on sensitivity information of wireless receivers 101 and 102 so as to optimize the sensitivity of those wireless receivers 101 and 102.

[0088] The noise-canceled signal generated by radio noise canceller 104D in this way is transmitted from antenna 141. The noise-canceled signal transmitted from antenna 141 is also received by wireless receivers 101 and 102.

[0089] In each of the wireless receivers 101 and 102, the received noise is cancelled by the received noise cancellation signal (see FIGS. 4 and 5). This allows the wireless receivers 101 and 102 to receive only the desired signal, and reduces deterioration of sensitivity due to noise generated from the noise source 103.

[0090] As described above, camera 100D shown in Fig. 9 has radio wave noise canceller 104D, which acquires noise generated from noise generation source 103, adjusts the phase and gain of this noise, and transmits the resulting noise cancellation signal from antenna 141. Therefore, similar to camera 100A shown in Fig. 1, it is possible to effectively cancel noise that is generated from noise generation source 103 and affects the sensitivity of wireless receivers 101 and 102, thereby achieving effects such as reducing deterioration in the sensitivity of wireless receivers 101 and 102 due to radio wave noise.

[0091] 9 adjusts the phase and gain of noise received by antenna 141 based on sensitivity information of wireless receivers 101 and 102. That is, phase adjustment section 143D and gain adjustment section 144D of radio noise canceller 104D adjust the phase and gain using parameters calculated based on the sensitivity information of wireless receivers 101 and 102 so as to optimize the sensitivity of those wireless receivers 101 and 102. Therefore, it is possible to automatically adjust the phase and gain so that the sensitivity of wireless receivers 101 and 102 is always optimized.

[0092] <5. Variations> In the above-described embodiment, an example was given in which the electronic device equipped with a radio wave noise canceller was a camera, but the present technology can also be applied to other electronic devices (smartphones, smart watches, portable audio players, personal computers, television receivers, smart speakers, robots, etc.) that have a noise source and a wireless receiver whose sensitivity is affected by the noise generated from the noise source.

[0093] Furthermore, in the above-described embodiment, an example was shown in which the radio wave noise canceller and the wireless receiver are present in the same electronic device, but it is also possible that the radio wave noise canceller and the wireless receiver are present in different electronic devices. In this case, the radio wave noise canceller will be placed near the noise source in the electronic device that has the noise source. It is also possible that the radio wave noise canceller exists independently of the electronic device that has the noise source.

[0094] Furthermore, in the above-described embodiments, examples of wireless receivers are shown as Wi-Fi receivers, Bluetooth receivers, and GPS receivers, but other wireless receivers, such as receivers for mobile communication systems such as 4G and 5G, may also be used.

[0095] Furthermore, while the preferred embodiments of the present disclosure have been described in detail with reference to the accompanying drawings, the technical scope of the present disclosure is not limited to such examples. It is clear that a person skilled in the art of the present disclosure can conceive of various modified or altered examples within the scope of the technical ideas described in the claims, and it is understood that these also naturally fall within the technical scope of the present disclosure.

[0096] Furthermore, the effects described herein are merely descriptive or exemplary and are not limiting. In other words, the technology according to the present disclosure may achieve other effects that will be apparent to those skilled in the art from the description of this specification, in addition to or in place of the above-described effects.

[0097] The present technology can also be configured as follows. (1) a noise acquisition unit that acquires noise generated from a noise source; a noise adjustment unit that adjusts the phase and gain of the noise acquired by the noise acquisition unit to obtain a noise cancellation signal; an antenna unit that transmits a noise cancellation signal obtained by the noise adjustment unit; Noise cancellation device. (2) The noise acquisition unit acquires the noise generated from the noise source by receiving it with the antenna unit. The noise cancellation device according to (1) above. (3) A directional coupling unit is provided that sends the noise generated from the noise source and received by the antenna unit to the noise adjustment unit, and also sends a noise cancellation signal obtained by the noise adjustment unit to the antenna unit. The noise cancellation device according to (2) above. (4) The directional coupling unit is a circulator. The noise cancellation device according to (3) above. (5) The noise acquisition unit acquires the noise generated from the noise source through an electric wiring. The noise cancellation device according to (1) above. (6) The antenna unit is disposed within a distance of 1 / 10 or less of the wavelength of the radio signal to be received by the predetermined radio receiving unit from the noise source. The noise cancellation device according to any one of (1) to (5). (7) The noise adjustment unit adjusts the phase and gain of the noise acquired by the noise acquisition unit based on sensitivity information of a predetermined wireless receiving unit. The noise cancellation device according to any one of (1) to (6). (8) The noise source is a noise source present in an electronic device equipped with a predetermined wireless receiver. The noise cancellation device according to any one of (1) to (7). (9) The electronic device is a camera. The noise cancellation device according to (8) above. (10) a procedure for acquiring noise generated from a noise source; adjusting the phase and gain of the acquired noise to obtain a noise-canceled signal; a step of transmitting the obtained noise cancellation signal from an antenna unit. Noise cancellation method. (11) a predetermined radio receiving unit; a noise source that generates noise that affects the sensitivity of the predetermined wireless receiving unit; Equipped with a noise cancellation device The chair cancellation device is a noise acquisition unit that acquires noise generated from the noise generation source; a noise adjustment unit that adjusts the phase and gain of the noise acquired by the noise acquisition unit to obtain a noise cancellation signal; an antenna unit that transmits a noise cancellation signal obtained by the noise adjustment unit; electronic equipment. [Explanation of symbols]

[0098] 100A~100D... Camera 101 Wireless receiver (WiFi / BLUETOOTH receiver) 101a, 102a... Antenna 102 Radio receiver (GPS receiver) 103, 103a, 103b Noise source 104A, 104B, 104D Noise canceller 105 Electrical wiring 120 Main LSI 121···Camera lens 122 Image Sensor 123 Sub LSI 124···LCD panel 125···Electronic viewfinder 126... Reference Clock 127...Power supply 128...External Interface 129...external storage device 130···LSI 141 Antenna 142 Circulator 143, 143D Phase adjustment section 144, 144D Gain adjustment section 145,146,147···Calculation section

Claims

1. a noise acquisition unit that acquires noise generated from a noise source; a noise adjustment unit that adjusts the phase and gain of the noise acquired by the noise acquisition unit to obtain a noise cancellation signal; an antenna unit that transmits a noise cancellation signal obtained by the noise adjustment unit; the noise acquisition unit acquires the noise generated from the noise generation source by receiving it with the antenna unit; The noise canceling device further includes a directional coupling unit that sends the noise generated from the noise source and received by the antenna unit to the noise adjustment unit, and that sends a noise cancellation signal obtained by the noise adjustment unit to the antenna unit. Noise cancellation device.

2. The directional coupling unit is a circulator. The noise canceling device according to claim 1 .

3. The antenna unit is disposed within a distance of 1 / 10 or less of the wavelength of a radio signal to be received by a predetermined radio receiving unit from the noise source. The noise canceller according to claim 1 .

4. The noise adjustment unit adjusts the phase and gain of the noise acquired by the noise acquisition unit based on sensitivity information of a predetermined wireless receiving unit. The noise canceller according to claim 1 .

5. The noise source is a noise source present in an electronic device equipped with a predetermined wireless receiver. The noise canceller according to claim 1 .

6. The electronic device is a camera. The noise canceller according to claim 5 .

7. A noise acquisition unit acquires noise generated from a noise source by receiving it with an antenna unit; a noise adjustment unit adjusting the phase and gain of the noise to obtain a noise-canceled signal; a transmitting unit transmitting the noise cancellation signal from the antenna unit; The method further includes a procedure in which the directional coupling unit sends the noise generated from the noise source and received by the antenna unit to the noise adjustment unit, and sends a noise cancellation signal obtained by the noise adjustment unit to the antenna unit. Noise cancellation method.

8. a predetermined wireless receiving unit; a noise source that generates noise that affects the sensitivity of the predetermined wireless receiving unit; Equipped with a noise cancellation device The noise cancellation device a noise acquisition unit that acquires noise generated from the noise generation source; a noise adjustment unit that adjusts the phase and gain of the noise acquired by the noise acquisition unit to obtain a noise cancellation signal; an antenna unit that transmits a noise cancellation signal obtained by the noise adjustment unit; the noise acquisition unit acquires the noise generated from the noise generation source by receiving it with the antenna unit; The antenna unit further includes a directional coupling unit that sends the noise generated by the noise source and received by the antenna unit to the noise adjustment unit, and that sends a noise cancellation signal obtained by the noise adjustment unit to the antenna unit. electronic equipment.

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