Electronic apparatus, control method, and program

Abstract

To achieve technique that can reduce deterioration of a high-speed transmission signal, and allows sharing of terminals having different signal systems.SOLUTION: An electronic apparatus has: a common terminal that is connected to an external device; a plurality of signal processing units that is connected to the common terminal; one or more first switches that switch one or more signal processing units of the plurality of signal processing units and the common terminal to a connection state or a non-connection state; and control means that controls the operation state of the plurality of signal processing units and the open and closed state of the first switches. The plurality of signal processing units includes a first signal processing unit that is connected to the common terminal not via the first switches and processes a first signal, and one or more signal processing units that are connected to the common terminal via the first switches and process signals transmitted at a lower speed than the first signal. The control means controls the first switches to be in the non-contact state in a state where the first signal processing unit processes the first signal.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a technique for sharing terminals with different signal formats.

Background Art

[0002] Electronic devices such as digital video cameras are equipped with a plurality of terminals (interfaces) compatible with various signal formats (signal standards), such as terminals for inputting and outputting analog signals and digital signals in serial or parallel. Since these terminals each have a dedicated shape, the types and numbers of terminals mounted on the electronic device affect the size of the housing that constitutes the outer shape of the electronic device.

[0003] In addition, since miniaturization of electronic devices is desired, there is a technique for sharing a plurality of terminals in order to reduce the housing size (Patent Documents 1 and 2). Patent Document 1 describes a configuration in which a plurality of signal processing units are connected in parallel to a shared terminal, and the signal processing units are switched by a switch circuit. Patent Document 2 describes a configuration in which the path from the shared terminal to the signal processing unit is switched by a plurality of switch elements.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] In Patent Document 1, since the input signal of the shared terminal passes through the switch circuit, there is a concern that the signal may deteriorate. Patent Document 2 does not consider sharing a low-speed transmission signal terminal and a high-speed transmission signal terminal.

[0006] The present invention has been made in view of the above problems, and an object thereof is to realize a technology capable of reducing deterioration of a high-speed transmission signal and sharing terminals with different signal formats.

Means for Solving the Problems

[0007] In order to solve the above problems and achieve the object, an electronic device of the present invention includes a common terminal connected to an external device, a plurality of signal processing units connected to the common terminal, and one or more first switches for switching one or more signal processing units among the plurality of signal processing units and the common terminal between a connected state and a non-connected state, an operating state of the plurality of signal processing units, and control means for controlling the first switch to be in an open / closed state. The plurality of signal processing units include a first signal processing unit connected to the common terminal without passing through the first switch and processing a first signal, and one or more signal processing units connected to the common terminal via the first switch and processing a signal having a lower transmission speed than the first signal. The control means sets the first switch to a non-connected state when the first signal processing unit processes the first signal.

Effects of the Invention

[0008] According to the present invention, it is possible to reduce deterioration of a high-speed transmission signal and share terminals with different signal formats.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Modes for Carrying Out the Invention

[0010] Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. Note that the following embodiments do not limit the invention according to the claims. Although a plurality of features are described in the embodiments, not all of these plurality of features are essential for the invention, and the plurality of features may be arbitrarily combined. Further, in the accompanying drawings, the same or similar configurations are denoted by the same reference numerals, and redundant descriptions are omitted.

[0011] In this embodiment, an example where the electronic device is an imaging device such as a digital video camera that captures images such as moving images will be described. However, the present invention is not limited to the imaging device, and it may be a video device that records, plays back, or edits images.

[0012] [Embodiment 1] First, with reference to FIG. 1, the configuration and functions of the electronic device according to Embodiment 1 will be described.

[0013] The electronic device 100a according to Embodiment 1 is provided with one common terminal 1 and a plurality (three in FIG. 1) of external output terminals 2, 3, and 4. The common terminal 1 and the external output terminals 2, 3, and 4 are provided on a housing that constitutes the outer shape of the electronic device 100a, and are connected to a signal processing circuit via a signal transmission path inside the electronic device 100a.

[0014] The common terminal 1 is configured by sharing input terminals for signals having different signal formats (signal standards) such as analog, digital, serial, and parallel, which are input from an external device, and having different transmission speeds and frequency bands.

[0015] The external output terminals 2, 3, and 4 are connected to the video input terminals of an external device via a cable or the like, and output a video signal to the external device.

[0016] The external device is an imaging device that captures images such as moving images, a video device that records, plays back, or edits images, or the like.

[0017] The electronic device 100a includes a control unit 40a, an imaging unit 50, an image processing unit 60, a recording unit 70, a display unit 80, and a video output unit 90.

[0018] The control unit 40a includes a microcomputer, an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), etc. that control the entire electronic device 100a. The microcomputer includes a processor (CPU, MPU) that performs arithmetic processing and control processing of the electronic device 100a, a volatile memory (ROM) that stores programs executed by the processor, a program read from a non-volatile memory, and a work memory (RAM) into which constants, variables, etc. for executing the program are loaded. The control unit 40a controls each component of the electronic device 100a by loading and executing the program stored in the ROM into the RAM.

[0019] The imaging unit 50 includes an image sensor composed of a CCD, a CMOS, etc. that converts a subject image into an electrical signal, and an A / D converter that converts the analog video signal output from the image sensor into a digital signal. The imaging unit 50 performs an imaging operation including resetting, signal accumulation (exposure), and signal readout for each pixel of the image sensor based on the timing signal of the control unit 40a, and performs noise reduction processing, etc. on the generated analog video signal for each frame to output a digital video signal.

[0020] The image processing unit 60 performs digital signal processing on the video signal output from the imaging unit 50. The digital signal processing includes debayering processing, development processing, gamma processing, encoding processing, etc. The video data generated by the image processing unit 60 is output to the display unit 80 and the video output unit 90, and is also stored in the recording unit 70 as a video file such as H.264 / MPEG-4. The image processing unit 60 is composed of a GPU (Graphics Processing Unit), an ASIC, an FPGA, etc.

[0021] The recording unit 70 is a memory card, a hard disk, an SSD (Solid State Drive), etc. that stores the video file generated by the image processing unit 60.

[0022] The display unit 80 includes a display device such as a liquid crystal display or an organic EL display that displays live view images, playback videos, a GUI (Graphical User Interface) for performing various settings of the electronic device 100a, etc. Further, the display unit 80 is integrally configured with a touch panel that receives user operations, and can detect the user's touch operations on the GUI. Various settings of the electronic device 100a include, for example, settings at the time of imaging, settings at the time of recording, settings at the time of display, settings at the time of video output, and settings of the function assigned to the common terminal 1. The setting of the function assigned to the common terminal 1 is a setting at the time of synchronization with an external device (external synchronization setting), and includes a setting for inputting or outputting an analog signal and a setting for inputting or outputting a digital signal. The control unit 40a changes the settings and controls the operation of the electronic device 100a according to the user operations via the touch panel. Note that the electronic device 100a may include an operation unit such as a push button, a rotary dial, or a slide switch that receives user operations other than the touch panel.

[0023] The video output unit 90 converts the video data output from the image processing unit 60 into a video signal in a form compliant with a predetermined standard and outputs it to an external device via the external output terminals 2, 3, and 4. The video output unit 90 is configured by an ASIC, an FPGA, etc., and may be configured on the same IC chip as the control unit 40a and the image processing unit 60. The external output terminals 2, 3, and 4 are, for example, a connector that outputs a video signal compliant with HDMI (registered trademark) (High-Definition Multimedia Interface) and two coaxial connectors that output a video signal compliant with SDI (Serial Digital Interface). As the transmission speed of the video signal, for the coaxial connectors, for example, BNC connectors with an impedance of 75Ω for 12G-SDI corresponding to 12Gbps and 3G-SDI corresponding to 3Gbps are used.

[0024] The common terminal 1 is connected to the first signal processing unit 30 and the second signal processing unit 31. The first signal processing unit 31 is connected to the common terminal 1 without passing through the first switch 20, and the second signal processing unit 32 is connected to the common terminal 1 via the first switch 20. The first signal processing unit 30 and the second signal processing unit 31 process signals with different signal formats (signal specifications), such as signals with different transmission speeds and frequency bands. The second signal processing unit 31 processes signals with a narrower frequency band, lower transmission speed, and lower frequency than the signals processed by the first signal processing unit 30.

[0025] The common terminal 1 is a coaxial connector to which a synchronization signal is input from an external device. For example, a BNC connector with an impedance of 75Ω or a DIN 1.0 / 2.3 connector is used. These synchronization signals are transmitted through a 75Ω transmission line and terminated by a termination unit 10 composed of a 75Ω termination resistor arranged between the transmission line and GND to reduce signal degradation due to reflection noise. The video camera may synchronize with the external device using an analog signal or a digital signal. When synchronizing with an analog signal, an analog synchronization signal such as a Black Burst signal or a three-value synchronization signal is used. When synchronizing with a digital signal, a digital synchronization signal such as an SD-SDI (Standard Definition-SDI) signal, an HD-SDI (High Definition-SDI) signal, or a 3G-SDI signal is used. The SDI signal is a video signal corresponding to a return video that is video captured by another imaging device.

[0026] Since the analog synchronization signal and the digital synchronization signal are signals with different signal formats (signal specifications), transmission speeds, and frequency bands, a signal processing circuit suitable for each signal is required.

[0027] In the case of a digital synchronization signal, the synchronization signal is input to the first signal processing unit 30. The first signal processing unit 30 performs equalizer processing on the SDI signal, detects the horizontal synchronization signal H and the vertical synchronization signal V, and generates a clock signal for synchronizing the control unit 40a with an external device. The first signal processing unit 30 is composed of an equalizer IC for equalizer processing, an ASIC or FPGA for detecting the horizontal synchronization signal H and the vertical synchronization signal V, a PLL (Phase Locked Loop) for generating a clock signal, and the like. The ASIC or FPGA may be configured on the same IC chip as the control unit 40a and the image processing unit 60. Note that the return video input to the first signal processing unit 30 from an external device via the common terminal 1 can be displayed on the display unit 80 via the image processing unit 60 after the equalizer processing, and can also be output to an external device via the video output unit 90 and the external output terminals 2, 3, and 4.

[0028] In the case of an analog synchronization signal, the synchronization signal is input to the second signal processing unit 31 via the first switch 20. The second signal processing unit 31 detects the horizontal synchronization signal H and the vertical synchronization signal V, and generates a clock signal for synchronizing the control unit 40a with an external device. The second signal processing unit 31 is composed of a sink separator circuit for detecting the horizontal synchronization signal H and the vertical synchronization signal V, an ASIC or FPGA, a PLL for generating a clock signal, and the like. Note that instead of the sink separator circuit and the ASIC or FPGA, a dedicated sink separator IC may be used. The ASIC or FPGA may be configured on the same IC chip as the control unit 40a, the image processing unit 60, and the first signal processing unit 30.

[0029] The clock signal generated by the first signal processing unit 30 or the second signal processing unit 31 is input to the control unit 40a. The control unit 40a synchronizes the imaging operation of the imaging unit 50 with an external device based on the clock signal input from the first signal processing unit 30 or the second signal processing unit 31. The control unit 40a controls power-down and the like of the first signal processing unit 30 and the second signal processing unit 31 according to the external synchronization setting of the electronic device 100a.

[0030] Here, the SD-SDI signal, HD-SDI signal, and 3G-SDI signal are defined in terms of physical layer specifications by SMPTE (the Society of Motion Picture and Television Engineers) 259M, SMPTE 292M, and SMPTE 424M, respectively. One of the items in these specifications is return loss (reflection loss), and for the 3G-SDI signal, 15 dB or more (5 MHz to 1.485 GHz) and 10 dB or more (1.485 to 2.97 GHz) are required. To meet this requirement, it is necessary to match the impedance between the common terminal 1 and the signal processing units 30 and 31. However, in this embodiment, since the transmission line branches into the first signal processing unit 30 and the second signal processing unit 31 at position A in FIG. 1, impedance mismatch occurs.

[0031] Therefore, in this embodiment, when an SDI signal is input from the common terminal 1, to reduce the influence of signal reflection in the second signal processing unit 31, the first switch 20 is switched to the open state to disconnect the common terminal 1 and the second signal processing unit 31. As a result, the impedance of the first switch 20 as seen from the common terminal 1 becomes high impedance, so that the impedance mismatch at the branch point A of the transmission line from the common terminal 1 to the first signal processing unit 30 can be reduced. Furthermore, since there is no switch in the transmission line between the common terminal 1 and the first signal processing unit 30, impedance mismatch due to the signal passing through the inside of the switch circuit does not occur.

[0032] Note that, to further reduce impedance mismatch, the first switch 20 may be arranged near the branch point A so that the stub length at the branch point A is minimized, or the first switch 20 may be arranged on the surface opposite to the transmission line from the common terminal 1 to the first signal processing unit 30. Furthermore, it is desirable that the first switch 20 has an input capacitance that is sufficiently small with respect to the frequency of the signal input from the common terminal 1.

[0033] The control unit 40a controls the operating states of the first signal processing unit 30 and the second signal processing unit 31, and the open / closed state of the first switch 20 according to the external synchronization setting of the electronic device 100a. When the external synchronization setting is a setting for inputting a digital synchronization signal, the control unit 40a sets the first signal processing unit 30 to a state of processing an input signal and switches the first switch 20 to a closed state. When the external synchronization setting is a setting for inputting an analog synchronization signal, the control unit 40a sets the second signal processing unit 31 to a state of processing an input signal and switches the first switch 20 to a closed state.

[0034] Note that the signal processing unit may automatically determine the type of the synchronization signal input from the common terminal 1 and perform open / close control of the first switch 20 according to the determination result. In this case, by changing the open / closed state of the first switch 20, the synchronization signal is input to the first signal processing unit 30 and the second signal processing unit 31 in a time-division manner, and the open / closed state of the first switch 20 may be controlled so that the synchronization signal is input to the signal processing unit corresponding to the determination result. In this case, the open / close control of the first switch 20 may be performed by the first signal processing unit or the second signal processing unit 31. Alternatively, when the synchronization signal is detected by the equalizer IC using the cable detection function mounted on the equalizer IC of the first signal processing unit 30, the first switch 20 may be set to an open state. In this case, the open / close control of the first switch 20 may be performed by the first signal processing unit. Alternatively, the type of the synchronization signal may be determined by analyzing the amplitude voltage, frequency, and other signal characteristics of the synchronization signal, and the open / close of the first switch 20 may be controlled.

[0035] In the example of FIG. 1, there are two signal processing units, but there may be three or more signal processing units. In this case, a switch may be arranged in the transmission path of the signal processing unit with the highest signal transmission speed, frequency, and strict impedance matching requirements, and a switch may be arranged in the transmission path of other signal processing units. Further, in the example of FIG. 1, only the second signal processing unit 31 is provided after the first switch 20, but there may be a plurality of signal processing units. In this case, in order to isolate between the plurality of signal processing units, a switch may be further provided between the first switch 20 and the signal processing unit. Also in this case, the arrangement of the switch may be determined according to the requirements for impedance matching, the signal transmission speed, and the frequency. Note that the opening and closing control of these switches may also be performed by the control unit 40a.

[0036] In this embodiment, the common terminal 1 is a synchronization signal with an external device, and an example of sharing terminals of signals with different signal formats (signal specifications), transmission speeds, and frequency bands has been described, but it is not limited to the synchronization signal.

[0037] As described above, according to Embodiment 1, the common terminal 1 and the plurality of signal processing units 30 and 31 are connected via a transmission path, and a switch for switching the connection state or the non-connection state between the common terminal 1 and the signal processing unit according to the requirements for impedance matching is arranged. Thereby, deterioration of the high-speed transmission signal can be reduced, terminals with different signal formats can be shared, and the electronic device 100a can be miniaturized.

[0038] [Embodiment 2] Next, with reference to FIG. 2, the configuration and functions of the electronic device according to Embodiment 2 will be described.

[0039] In FIG. 2, among the configuration and functions of the electronic device 100b according to Embodiment 2, parts common to Embodiment 1 are denoted by the same reference numerals.

[0040] The electronic device 100b according to Embodiment 2 is different from the electronic device 100a according to Embodiment 1 in the control process of the control unit 40b, and the second switch 21 and the third signal processing unit 32 are added.

[0041] In Embodiment 2, the common terminal 1 is configured by sharing input / output terminals for signals having different signal formats (signal standards), such as analog, digital, serial, and parallel, input / output from an external device, and signals having different transmission speeds and frequency bands.

[0042] The control unit 40b outputs a clock signal synchronized with the imaging operation of the imaging unit 50 to the third signal processing unit 32. The third signal processing unit 32 generates a synchronization signal synchronized with the imaging operation of the imaging unit 50 based on the synchronization clock signal from the control unit 40a, and outputs the synchronization signal to an external device via the common terminal 1. The control unit 40b performs control such as power-down of the first signal processing unit 30, the second signal processing unit 31, and the third signal processing unit 32 according to the external synchronization setting of the electronic device 100b.

[0043] The third signal processing unit 32 is composed of, for example, an ASIC or an FPGA for generating a synchronization signal and a video driver for outputting the synchronization signal to an external device. The video driver may be discretely configured using transistors and operational amplifiers, or a dedicated video driver IC may be used.

[0044] Since the signal processing units 30 and 31 of Embodiment 1 are circuits that process signals input from the common terminal 1, a 75Ω termination 10 for impedance matching is required. However, when the input signal terminal and the output signal terminal are shared as in Embodiment 2, the 75Ω termination 10 is not required when a signal is output from the common terminal 1.

[0045] Therefore, in this embodiment, a second switch 21 is arranged between the termination 10 and GND, and the second switch 21 is switched to the open state when a signal is output from the common terminal 1. As a result, the termination 10 is disconnected from the transmission path from the third signal processing unit 32, which is a signal output circuit, to the common terminal 1.

[0046] The control unit 40b controls the opening and closing of the second switch 21 according to the external synchronization setting of the electronic device 100b. When the external synchronization setting is a setting for inputting a signal, the control unit 40b switches the second switch 21 to the closed state, and when the external synchronization setting is a setting for outputting a signal, the control unit 40b switches the second switch 21 to the open state.

[0047] Also, when the external synchronization setting is a setting for inputting an analog synchronization signal or a setting for outputting a signal, the control unit 40b switches the first switch 20 to the closed state, and when the external synchronization setting is a setting for inputting a digital synchronization signal, the control unit 40b switches the first switch 20 to the open state. When the external synchronization setting is a setting for outputting a signal, the control unit 40b sets the third signal processing unit 32 to a state of processing the output signal and switches the first switch 20 to the closed state.

[0048] Note that in order to further reduce impedance mismatch, the termination 10 and the second switch 21 may be arranged near the branch point B so that the stub length at the branch point B is minimized, or the termination 10 and the second switch 21 may be arranged on the surface opposite to the transmission line from the common terminal 1 to the first signal processing unit 30. Also, the arrangement of the termination 10 and the second switch 21 may be reversed so that the stub length at the branch point B is minimized. Furthermore, the second switch 21 desirably has an input capacitance that is sufficiently small with respect to the frequency of the signal input from the common terminal 1.

[0049] In this embodiment, an example in which the common terminal 1 is a synchronization signal with an external device and shares terminals of signals having different signal formats (signal specifications), transmission speeds, frequency bands, etc. has been described, but it is not limited to the synchronization signal.

[0050] As described above, according to Embodiment 2, in addition to the effects of Embodiment 1, when a signal is input from the common terminal 1 and when a signal is output, the termination end 10 of the transmission line connecting the common terminal 1 and the third signal processing unit 32 is switched to a connected state or a non-connected state by a switch. Thereby, deterioration of the high-speed transmission signal can be reduced, terminals with different signal systems can be shared, and the electronic device 100b can be miniaturized.

[0051] [Embodiment 3] Next, with reference to FIG. 3, the configuration and functions of the electronic device according to Embodiment 3 will be described.

[0052] In FIG. 3, among the configuration and functions of the electronic device 100c according to Embodiment 3, the parts shared with Embodiment 1 are denoted by the same reference numerals.

[0053] The electronic device 100c according to Embodiment 3 has different control processing in the control unit 40c compared to the electronic device 100a according to Embodiment 1, and a first termination end 10a, a second termination end 10b, a third switch 21a, a fourth switch 21b, and a third signal processing unit 32 are added.

[0054] Also, in order to ensure signal quality, termination ends 10a and 10b are arranged near the first signal processing unit 30 and the second signal processing unit 31 with respect to the electronic device 100a according to Embodiment 1.

[0055] In Embodiment 3, the common terminal 1 is configured by sharing input / output terminals for signals with different signal systems (signal standards) such as analog, digital, serial, and parallel, which are input and output from an external device, and having different transmission speeds and frequency bands.

[0056] When the control unit 40c determines that the setting of the common terminal 1 has been changed by a user operation, it switches the third switch 21a and the fourth switch 21b to the closed state, connecting the common terminal 1 to the first signal processing unit 30 and the second signal processing unit 31. As a result, the signal amplitude value of the transmission line of the common terminal 1 can be reduced. In this embodiment, it becomes the combined resistance value of the first terminator 10a and the second terminator 10b. For example, when the terminating resistors are both 75 Ω, the combined resistance value on the terminating side is 75 / 2 = 37.5 Ω, and the signal amplitude value becomes about 687% of that of a normal 75 Ω system circuit.

[0057] Next, after a predetermined time has elapsed, the control unit 40c switches to the closed state switches other than the switch for realizing the function set by the user. For example, in the case of a setting using the first signal processing unit 30, the fourth switch 21b is switched to the closed state. In the case of a setting using the third signal processing unit 32, the third switch 21a and the fourth switch 21b are switched to the closed state. Note that in this embodiment, it is not necessary to perform control only for the time after a predetermined time has elapsed, and it may also be after it is determined that the signal amplitude value is smaller than a predetermined value. For example, when the first signal processing unit 30, the second signal processing unit 31, and the third signal processing unit 32 can detect the signal amplitude value, it may be determined by each signal processing unit, or a circuit configuration for determining the signal amplitude value may be added. When adding a circuit configuration, it is possible to ensure signal quality by arranging it in a signal processing unit (on the signal processing unit 31, 32 side of the first switch 20) having a frequency lower than the signal frequency of the first signal processing unit 30.

[0058] Also, as control for switching to the closed state switches other than the switch for realizing the function set by the user in the case where there are a plurality of signal processing units, terminators, and switches as in Embodiment 3, it is also possible to control the third switch 21a and the fourth switch 21b so that the combined resistance value of the terminators increases step by step. In this case, combinations of a plurality of terminators and a plurality of switches are stored in advance, the control unit 40c calculates the combined resistance value, and performs opening and closing control of the switches.

[0059] Also, in this case, it is also possible to disconnect the second terminal end 10b by the first switch 20. In the example of FIG. 3, the second terminal end 10b located downstream of the first switch 20 can be brought into the same state as when the fourth switch 21b is closed with respect to the second terminal end 10b viewed from the common terminal 1 by disconnecting the first switch 20.

[0060] Furthermore, when the control unit 40c determines that there is no input signal despite the setting of the common terminal 1 being changed to the input setting, the third switch 21a and the fourth switch 21b are once opened, and it is also possible to avoid circuit breakdown of the electronic device 100c by re-performing the series of control sequences of Embodiment 3.

[0061] As described above, according to Embodiment 3, when a plurality of terminal ends 10a and 10b are arranged near a plurality of signal processing units 30 and 31 to ensure signal quality, the opening and closing states of the plurality of terminal ends 10a and 10b are controlled by the third switch 21a and the fourth switch 21b in response to a change in the setting of the common terminal 1, thereby suppressing the signal amplitude value and preventing circuit breakdown of the electronic device.

[0062] [Other Embodiments] The present invention can also be realized by supplying a program that realizes one or more functions of the above-described embodiments to a system or device through a network or a storage medium, and causing one or more processors in a computer of the system or device to read and execute the program. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

[0063] The invention is not limited to the above-described embodiments, and various changes and modifications are possible without departing from the spirit and scope of the invention. Therefore, the claims are attached to disclose the scope of the invention.

[0064] The disclosure of this specification includes the following electronic devices, control methods, and programs. [Configuration 1] A common terminal connected to an external device, A plurality of signal processing units connected to the common terminal, One or more first switches for switching one or more of the plurality of signal processing units and the common terminal between a connected state and a non-connected state, Control means for controlling the operating states of the plurality of signal processing units and the open / closed state of the first switch, The plurality of signal processing units include a first signal processing unit connected to the common terminal without passing through the first switch and processing a first signal, and one or more signal processing units connected to the common terminal via the first switch and processing a signal having a lower transmission speed than the first signal, The control means is characterized in that the first switch is in a non-connected state when the first signal processing unit processes the first signal. An electronic device. [Configuration 2] Setting means for setting a function assigned to the common terminal, The control means is characterized in that the plurality of signal processing units are controlled to be in a first state of processing a signal or a second state of not processing a signal according to the function assigned to the common terminal. The electronic device according to Configuration 1. [Configuration 3] The plurality of signal processing units include a second signal processing unit for processing a signal having a lower frequency than the first signal, The frequency of the first signal is higher than the frequency of the second signal processed by the second signal processing unit, The first switch is characterized in that it switches the second signal processing unit and the common terminal between a connected state and a non-connected state. The electronic device according to Configuration 2. [Configuration 4] The control means sets the first signal processing unit to the first state and the second signal processing unit to the second state in response to the input of the first signal to the common terminal, and sets the first signal processing unit to the second state and the first signal processing unit to the first state in response to the input of the second signal to the common terminal. The electronic device according to Configuration 3. [Configuration 5] The electronic device according to Configuration 3 or 4, wherein the control means causes the first signal processing unit to disconnect the first switch in the first state. [Configuration 6] The electronic device according to any one of Configurations 1 to 5, further comprising a terminator for terminating a signal input to the common terminal. [Configuration 7] The electronic device according to Configuration 3, wherein the plurality of signal processing units are connected to the common terminal via the first switch, and include a third signal processing unit that outputs a signal to the common terminal. [Configuration 8] The electronic device according to Configuration 7, wherein the control means causes the third signal processing unit to be in the first state, and causes the first signal processing unit and the second signal processing unit to connect the first switch in the second state. [Configuration 9] a terminator for terminating a signal input to the common terminal; a second switch for switching the connection state or the non-connection state between the terminator and GND; when a signal is input from the common terminal, the second switch is set to the connected state; The electronic device according to Configuration 7 or 8, wherein when a signal is output from the common terminal, the second switch is set to the non-connected state. [Configuration 10] The electronic device according to Configuration 9, wherein the control means switches the second switch between the connected state and the non-connected state according to the function assigned to the common terminal. [Configuration 11] a first terminator that is provided between the position where the signal branches from the common terminal to the first signal processing unit and the second signal processing unit and terminates the signal input to the common terminal; a second terminator that is provided between the first switch and the second signal processing unit after the position and terminates the signal input to the common terminal; A third switch for switching the first terminal end and GND between a connected state and a non-connected state, A fourth switch for switching the second terminal end and GND between a connected state and a non-connected state, wherein the electronic device according to Configuration 3 is characterized by having the fourth switch. [Configuration 12] When the function assigned to the common terminal is changed, the control means turns on the third switch and the fourth switch, and after a predetermined time has elapsed, switches off the switches other than the switch that realizes the function assigned to the common terminal. The electronic device according to Configuration 11, characterized in that. [Configuration 13] When the function assigned to the common terminal is changed, the control means turns on the third switch and the fourth switch, and when the signal amplitude value of the common terminal is smaller than a predetermined value, switches off the switches other than the switch that realizes the function assigned to the common terminal. The electronic device according to Configuration 11, characterized in that. [Configuration 14] When the fourth switch is in the connected state, the control means disconnects the first switch to switch the second terminal end and GND between a connected state and a non-connected state. The electronic device according to Configuration 11, characterized in that. [Configuration 15] When the function assigned to the common terminal is a setting for inputting a signal, if the control means determines that no signal is being input, it disconnects the third switch and the fourth switch and re-executes the control when the function assigned to the common terminal is changed. The electronic device according to Configuration 13, characterized in that. [Configuration 16] A control method for an electronic device, The electronic device includes A common terminal connected to an external device, A plurality of signal processing units connected to the common terminal, One or more first switches for switching one or more of the plurality of signal processing units and the common terminal between a connected state and a non-connected state. The plurality of signal processing units include a first signal processing unit that is connected to the common terminal without passing through the first switch and processes a first signal, and one or more signal processing units that are connected to the common terminal through the first switch and process a signal having a lower transmission speed than the first signal. The control method includes: steps of controlling an operating state of a plurality of signal processing units and an open / closed state of the first switch. In the step of controlling, the first switch is set to a non-connected state when the first signal processing unit processes the first signal. [Configuration 17] A program for causing a computer to function as the electronic device according to any one of Configurations 1 to 15.

Description of Reference Numerals

[0065] 1... common terminal, 10, 10a, 10b... terminal portions, 20, 21a, 21b... switches, 30... first signal processing unit, 31... second signal processing unit, 32... third signal processing unit, 40a, 40b, 40c... control units, 100a, 100b, 100c... electronic devices

Claims

1. A common terminal connected to an external device, a plurality of signal processing units connected to the common terminal, one or more first switches for switching one or more of the plurality of signal processing units and the common terminal between a connected state and a non-connected state, and control means for controlling the operating states of the plurality of signal processing units and the open / closed state of the first switch, The plurality of signal processing units include a first signal processing unit connected to the common terminal without passing through the first switch and processing a first signal, and one or more signal processing units connected to the common terminal via the first switch and processing a signal having a lower transmission speed than the first signal, The control means is characterized in that the first switch is in a non-connected state when the first signal processing unit processes the first signal. An electronic device.

2. having setting means for setting a function assigned to the common terminal, The control means is characterized in that the plurality of signal processing units are controlled to be in a first state of processing signals or a second state of not processing signals according to the function assigned to the common terminal. The electronic device according to claim 1.

3. The plurality of signal processing units include a second signal processing unit for processing a signal having a lower frequency than the first signal, The frequency of the first signal is higher than the frequency of the second signal processed by the second signal processing unit, The first switch is characterized in that it switches the second signal processing unit and the common terminal between a connected state and a non-connected state. The electronic device according to claim 2.

4. The control means sets the first signal processing unit to the first state and the second signal processing unit to the second state in response to the input of the first signal to the common terminal, and sets the first signal processing unit to the second state and the first signal processing unit to the first state in response to the input of the second signal to the common terminal. The electronic device according to claim 3, characterized in that.

5. The control means disconnects the first switch when the first signal processing unit is in the first state. The electronic device according to claim 3, characterized in that.

6. The electronic device according to claim 1, further comprising a terminator for terminating a signal input to the common terminal.

7. The plurality of signal processing units are connected to the common terminal via the first switch, and the electronic device according to claim 3, further comprising a third signal processing unit for outputting a signal to the common terminal.

8. The control means connects the first switch when the third signal processing unit is in the first state and the first signal processing unit and the second signal processing unit are in the second state. The electronic device according to claim 7, characterized in that.

9. A terminator for terminating a signal input to the common terminal, A second switch for switching the connection state or the non-connection state between the terminator and the GND, and When a signal is input from the common terminal, the second switch is set to the connected state, When a signal is output from the common terminal, the second switch is set to the non-connected state. The electronic device according to claim 7, characterized in that.

10. The control means switches the second switch to the connected state or the non-connected state according to the function assigned to the common terminal. The electronic device according to claim 9, characterized in that.

11. A first terminator that is provided between the position where the signal branches from the common terminal to the first signal processing unit and the second signal processing unit and terminates the signal input to the common terminal, and is downstream of the branched position. A second terminator that is provided between the first switch downstream of the position and the second signal processing unit and terminates the signal input to the common terminal. A third switch that switches the connection state or non-connection state between the first terminator and GND. The electronic device according to claim 3, further comprising a fourth switch that switches the connection state or non-connection state between the second terminator and GND.

12. When the function assigned to the common terminal is changed, the control means sets the third switch and the fourth switch to the connected state, and after a predetermined time has elapsed, switches the switches other than the switch that realizes the function assigned to the common terminal to the closed state. The electronic device according to claim 11, characterized in that.

13. When the function assigned to the common terminal is changed, the control means sets the third switch and the fourth switch to the connected state, and when the signal amplitude value of the common terminal is smaller than a predetermined value, switches the switches other than the switch that realizes the function assigned to the common terminal to the closed state. The electronic device according to claim 11, characterized in that.

14. The control means switches the connection state or non-connection state between the second terminator and GND by setting the first switch to the non-connection state when the fourth switch is in the connected state. The electronic device according to claim 11, characterized in that.

15. When the function assigned to the common terminal is a setting for inputting a signal, if the control means determines that no signal is being input, it disconnects the third switch and the fourth switch and re-performs the control when the function assigned to the common terminal is changed. The electronic device according to claim 13, characterized in that.

16. A method for controlling an electronic device, wherein the electronic device includes a common terminal connected to an external device, a plurality of signal processing units connected to the common terminal, and one or more first switches for switching one or more of the plurality of signal processing units between a connected state and a disconnected state with respect to the common terminal, the plurality of signal processing units including a first signal processing unit connected to the common terminal without passing through the first switch and processing a first signal, and one or more signal processing units connected to the common terminal through the first switch and processing a signal having a lower transmission speed than the first signal, the control method including steps of controlling operating states of the plurality of signal processing units and an open / closed state of the first switch, wherein, in the step of control, the first switch is set to a disconnected state when the first signal processing unit is processing the first signal.

17. A program for causing a computer to function as the electronic device according to any one of claims 1 to 15.

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