Transmission device

Abstract

To provide a transmission device that allows a camera operator to comprehensively handle all the information necessary for camera operation in an environment that connects the camera to a studio sub and a broadcast vehicle built using an IP signal.SOLUTION: A transmission device receives a video signal as a baseband signal from an external camera, converts it to an IP signal, and transmits a video. The transmission device includes a transmitting unit that transmits the camera video currently being captured received from the camera to a specified external device, and a display provided on the housing of the transmission device.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a transmission device. [Background technology]

[0002] There is known a transmission device that can be connected to an external camera. For example, the transmission device is connected to a television camera and transmits the image being shot that is input from the television camera to a camera control unit in a control room. There is also known a television camera that receives a return image showing the image being on air from the camera control unit and displays the return image on a display (see, for example, Patent Documents 1 and 2). This transmission device also has functions such as transmitting and receiving intercom signals and receiving and displaying tally display commands, and this single transmission device is capable of exchanging signals required for camera operation. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-57499 A [Patent Document 2] JP 2015-133681 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the past, this type of transmission equipment typically converted electricity into light for transmission, but as studios and other facilities have recently become IP-based, there is no equipment that can comprehensively exchange the information necessary for camera operation between a studio sub or broadcast vehicle built using IP signals and the camera operated by the cameraman. As a result, it is necessary to prepare IP-compatible video transmission equipment, IP-compatible intercom equipment, and IP-compatible tally signal receivers separately, and the time required for connection checks, connection adjustments, and equipment preparation has increased, resulting in increased costs for program production.

[0005] The present invention aims to provide a transmission device that allows camera operators to comprehensively handle information necessary for camera operation in an environment where cameras are connected to sub studios and broadcast vehicles built using IP signals. [Means for solving the problem]

[0006] One aspect of the present invention is a transmission device that receives a video signal as a baseband signal from an external camera, converts it to an IP signal, and transmits the video, and includes a transmitter that transmits the camera video currently being captured received from the camera to a specified external device, and a display provided on the housing of the transmission device. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a schematic diagram of a transmission system. [Figure 2A] FIG. [Figure 2B] FIG. [Diagram 3] FIG. 2 is a block diagram showing an electrical configuration of the transmission device. [Figure 4A] 4 is an example of a screen displayed on the transmission device according to the first embodiment. [Figure 4B] 11 is another example of a screen displayed on the transmission device according to the first embodiment. [Figure 4C] 11 is another example of a screen displayed on the transmission device according to the first embodiment. [Figure 5A] 13 is a first example of a screen displayed on a transmission device according to a second embodiment. [Figure 5B] 13 is a second example of a screen displayed on the transmission device according to the second embodiment. [Figure 5C] 13 is a third example of a screen displayed on the transmission device according to the second embodiment. [Figure 6] 13 is an example of a screen displayed on a transmission device according to a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings, the same or equivalent elements are designated by the same reference numerals, and duplicated explanations will be omitted.

[0009] [First embodiment] A first embodiment of the present disclosure will be described. Fig. 1 is a schematic diagram of a transmission system 100. As shown in Fig. 1, the transmission system 100 includes a camera 101 capable of capturing video, a transmission device 102 connectable to the external camera 101, and a camera control unit (CCU) 103 provided in, for example, a control room of a broadcasting station.

[0010] Camera 101 is, for example, a television camera that captures images to be used in television broadcasting, and transmits the camera images being captured as baseband signals to an external device. In this example, camera 101 transmits the camera images, the baseband signals of which are HD-SDI (High Definition Serial Digital Interface), to transmission device 102 connected via a coaxial cable. Note that the baseband signal is not limited to an HD-SDI signal, and may be, for example, an HDMI (registered trademark) (High-Definition Multimedia Interface) signal.

[0011] The transmission device 102 receives a video signal as a baseband signal from the external camera 101, converts it to an IP signal, and transmits the video. In this example, the transmission device 102 compresses the HD-SDI camera video received from the camera 101 using a predetermined image / audio codec (e.g., H.264 / MPEG-4 AVC). The transmission device 102 converts the compressed data into an IP signal of a predetermined transfer protocol (e.g., MPEG2-TS (Transport Stream)), and transmits it to the IP switch 104 connected by a LAN cable. The IP switch 104 transmits the IP signal received from the transmission device 102 to the CCU 103 via an Internet optical line. Note that multiple cameras 101 may be connected to the IP switch 104.

[0012] The CCU 103 is an electronic device for remotely adjusting the aperture, color tone, and the like of the camera 101. In this example, the CCU 103 receives an IP signal transmitted from the transmission device 102 via an IP switch 105 connected by a LAN cable, decodes the IP signal, and outputs an HD-SDI camera video. In the control room of the broadcasting station, the distributed video of the television broadcast is edited based on the camera video output from the CCU 103 and aired on terrestrial waves. Note that multiple CCUs 103 may be connected to the IP switch 105.

[0013] The physical configuration of the transmission device 102 will be described. FIG. 2A is a front view of the transmission device 102. FIG. 2B is a rear view of the transmission device 102. The transmission device 102 has a display 121 provided on its housing 120. The display 121 is provided on a first surface, which is the widest of the multiple side surfaces of the housing 120. An attachment portion 125 for attaching the housing 120 to the camera 101 is provided on a second surface, which is different from the first surface, of the multiple side surfaces.

[0014] 2A and 2B, the transmission device 102 has a box-shaped housing 120 that is thin in the front-rear direction. The longitudinal direction of the housing 120 is the left-right direction, and the lateral direction of the housing 120 is the up-down direction. The housing 120 is provided with a display 121, an operation unit 122, a tally lamp 123, a battery mount 124, an attachment unit 125, and the like. The display 121 is a horizontally long liquid crystal display provided on the front surface, which is the widest part of the housing 120, and equipped with a capacitive touch panel. The display 121 does not need to have an operation unit such as a touch panel, and may be a display device other than a liquid crystal display (for example, an organic EL display).

[0015] The operation unit 122 is provided to the right of the display 121 on the front side of the housing 120. The operation unit 122 includes various switches and dials for operating the transmission device 102, and various LEDs for notifying the status of the transmission device 102. The tally lamps 123 are LEDs provided on both the upper front and upper back sides of the housing 120 so as to be visible from either the front or the rear side of the transmission device 102. The battery mount 124 is a portion provided on the rear side of the housing 120 where a battery 340 (see FIG. 3) is attached and detached.

[0016] The attachment section 125 is a portion for attaching the transmission device 102 to the camera 101. The attachment section 125 has a plurality of screw holes on the rear side of the housing 120, into which indexing screws are fixed for attaching the transmission device 102 to the camera 101. By providing the attachment section 125 on the rear side of the housing 120, the cameraman can visually check the display 121 on the front side of the housing 120 in a state in which the transmission device 102 is attached to the camera 101. Note that the attachment section 125 may be attached to a member in the vicinity of the camera 101 (for example, a support stand for the camera 101) instead of being attached to the camera 101 itself.

[0017] Although not shown, various interfaces such as a DC power input terminal which is an input terminal for the external power supply 350 (see FIG. 3), an intercom audio input / output terminal, an HD-SDI video input / output terminal, a LAN input / output terminal, and other D-sub and USB connection terminals are provided on the bottom surface of the housing 120. In this example, a coaxial cable for connecting to the camera 101 is connected to the HD-SDI video input terminal in the housing 120. A LAN cable for connecting to the IP switch 104 is connected to the LAN input / output terminal in the housing 120.

[0018] The following describes the electrical configuration of the transmission device 102. Fig. 3 is a block diagram showing the electrical configuration of the transmission device 102. As shown in Fig. 3, the housing 120 of the transmission device 102 contains a main board 300, a display board 320, and an operation board 330, a battery 340 attached to a battery mount 124, and the like.

[0019] The main board 300 has a control unit 301, a storage unit 302, an SDI interface 303, a PHY (Physical Layer) 304, a power supply unit 305, an intercom interface 306, a tally lamp 123, etc. The control unit 301 is a processor such as a CPU, and in this example, an IP interface and a video / audio codec are implemented. The storage unit 302 is composed of an information recording medium such as a hard disk, a ROM, and a RAM, and holds a program executed by the control unit 301.

[0020] The SDI interface 303 is a circuit or chip for controlling input and output of SDI video to and from an external device. In this example, the SDI interface 303 inputs camera video received from the camera 101 connected to an HD-SDI video input terminal to the control unit 301. The SDI interface 303 can also transmit HD-SDI video to an external device connected to an HD-SDI video output terminal. For example, the SDI interface 303 transmits the camera video currently being shot received from the camera 101 as return video to the camera 101 or an external display connected to the video output terminal, thereby displaying the camera video currently being shot on the viewfinder of the camera 101 or on an external display.

[0021] The PHY 304 is a circuit or chip for implementing the lowest physical layer in the OSI hierarchical model. In this example, the PHY 304 can transmit and receive IP signals such as a ROP (Remote Operation Panel) signal, a tally signal, intercom audio, and stream video via the IP switch 104 connected to the LAN input / output terminal. The ROP signal is a control signal for remotely operating or adjusting the camera 101 from the CCU 103. The tally signal is a control signal for instructing the CCU 103 to turn on or blink a tally lamp. The intercom audio is a voice signal of an internal call between, for example, a cameraman, an operator in a control room, or a director of a broadcasting station.

[0022] PHY 304 transmits and receives IP signals of video streams (for example, camera images being shot and return images described later) using a specific video transmission protocol. In this example, PHY 304 transmits and receives MPEG2-TS IP signals using the SRT (Secure Reliable Transport) protocol. The SRT protocol is a video transmission protocol that can transmit video over IP with high stability and security.

[0023] The power supply unit 305 is connected to a battery 340 and an external power supply 350, and controls the power supply to the transmission device 102. The intercom interface 306 controls the input and output of intercom audio in an intercom headset 360 connected to the above-mentioned audio input / output terminal. The intercom headset 360 is worn by a cameraman using the camera 101.

[0024] The display board 320 is a controller that displays various images on the display 121 in accordance with instructions from the control unit 301. The operation board 330 is a controller that inputs a signal corresponding to an input operation on the operation unit 122 to the control unit 301.

[0025] The control unit 301 of the transmission device 102 includes a transmission unit 311, a reception unit 312, a display control unit 313, an intercom control unit 314, and a tally control unit 315. These functional blocks are realized by the control unit 301 executing a program stored in the storage unit 302.

[0026] The transmitter 311 transmits the camera video being shot received from the camera 101 to a specified external device. In this example, the transmitter 311 compresses the HD-SDI camera video using H.264 / MPEG-4 AVC as described above, converts it into an MPEG2-TS IP signal that multiplexes compressed audio onto the video, and transmits it from the PHY 304 to the CCU 103.

[0027] The receiving unit 312 receives various return signals from external devices. In this example, the receiving unit 312 receives return video currently on air in television broadcasting from the external device as an IP signal. Specifically, the CCU 103 transmits an IP signal of the return video, which is a distributed video currently on air in television broadcasting, to the transmission device 102 as a return signal. The PHY 304 of the transmission device 102 receives the return signal transmitted from the CCU 103. The receiving unit 312 decodes the return signal received by the PHY 304 to acquire the return video currently on air.

[0028] The display control unit 313 controls the display board 320 to display various screens on the display 121. In this example, the display control unit 313 displays a screen including a return video on the display 121, details of which will be described later. The intercom control unit 314 controls the intercom interface 306 to input and output intercom audio in the intercom headset 360. The tally control unit 315 controls the lighting or blinking of the tally lamp 123. Note that in this embodiment, the transmission device 102 does not necessarily have to include the intercom control unit 314 and the tally control unit 315.

[0029] Screen display control according to the first embodiment will now be described. Fig. 4A is an example of a screen displayed on the transmission device 102 according to the first embodiment. As described above, in the transmission device 102, the transmission unit 311 transmits an IP signal of a camera image being shot to the CCU 103. The reception unit 312 receives an IP signal of the return image being on air as a return signal from the CCU 103. As shown in Fig. 4A, the display control unit 313 decodes the return signal into the return image 401 being on air, and displays a screen 400 including the return image 401 on the display 121.

[0030] For example, the transmission device 102 may output the camera video being shot and the return video being on air from the SDI interface 303 to the camera 101, similar to a conventional transmission device. In this case, the cameraman can check the camera video and the return video by switching between them as appropriate on the viewfinder of the camera 101. However, when the camera video and the return video are switched between, the display screen of the viewfinder is switched instantly, which may cause significant eye fatigue for the cameraman. Also, if the subject moves while the return video is being displayed on the viewfinder, there is a risk that an important moment will be missed.

[0031] In contrast, according to this embodiment, for example, the camera image being shot can be displayed on the viewfinder of the camera 101 while the return image 401 is displayed on the display 121 of the transmission device 102 (see FIG. 4A). The cameraman can simultaneously check the camera image being shot and the return image 401 being on air without performing the above-mentioned image switching operation. This greatly reduces the burden on the cameraman and prevents him from missing an important moment.

[0032] The display control unit 313 may display a screen 400 including a camera video 402 and a return video 401 on the display 121 as follows. Figs. 4B and 4C are other examples of screens displayed on the transmission device 102 according to the first embodiment. The screen 400 illustrated in Fig. 4B displays the camera video 402 and the return video 401 side-by-side. The display control unit 313 may switch the display positions of the camera video 402 and the return video 401 on the screen 400, or may change the display sizes of the camera video 402 and the return video 401, in response to a key operation on the operation unit 122 or a touch operation on the display 121.

[0033] 4C displays the return video 401 in a picture-in-picture format overlaid on the camera video 402. The display control unit 313 may display the camera video 402 in a picture-in-picture format overlaid on the return video 401 in response to a key operation on the operation unit 122 or a touch operation on the display 121, or may change the display size of the video displayed in the foreground out of the camera video 402 and the return video 401.

[0034] Although not shown, the display control unit 313 may display on the display 121 an overlay image screen 400 in which the camera image 402 and the return image 401 are combined so as to overlap each other.

[0035] In this manner, the display 121 displays the screen 400 including the camera video 402 and the return video 401 by a display method such as side-by-side, picture-in-picture, overlay, etc. Even if the camera 101 is not provided with a viewfinder, for example, the cameraman can simultaneously check the camera video 402 being shot and the return video 401 being on air just by looking at the screen 400 on the display 121 of the transmission device 102.

[0036] [Second embodiment] A second embodiment of the present disclosure will be described. The following embodiments have different screen display control from the first embodiment. In the following embodiments, the same reference numerals will be used to designate the same or corresponding configurations or processes as those in the first embodiment, and the description will be omitted. The differences from the first embodiment will be described.

[0037] 5A is a first example of a screen displayed on the transmission device 102 according to the second embodiment. In the first example of the second embodiment, the receiving unit 312 receives information indicating a telop to be displayed in a television broadcast from an external device. Specifically, in the transmission device 102, the transmitting unit 311 transmits an IP signal of the camera video 501 being shot to the CCU 103. The receiving unit 312 receives the IP signal of the telop information as a return signal from the CCU 103.

[0038] The caption information may be a stream image of caption 502 used in the distributed image of a television broadcast, a still image of caption 502, or image information indicating the characters, color, size, position, etc. of caption 502 in the distributed image. As shown in Fig. 5A, display control unit 313 decodes the return signal into caption information, and displays on display 121 screen 503 on which caption 502 is superimposed on camera image 501 based on this caption information.

[0039] According to the first example described above, the cameraman can simultaneously check the camera image 501 being shot and the telop 502 displayed on the television broadcast, simply by looking at the screen 503 shown in Fig. 5A. This allows the cameraman to adjust the shooting range and zoom of the camera 101 so that an important subject is not overlapped with the telop 502, for example. Note that on the screen 503, the camera image 501 and the telop 502 may be displayed side-by-side or in picture-in-picture format, as in the first embodiment.

[0040] Fig. 5B is a second example of a screen displayed on the transmission device 102 according to the second embodiment. Fig. 5C is a third example of a screen displayed on the transmission device 102 according to the second embodiment. In the second and third examples of the second embodiment, the receiving unit 312 receives at least one of a background image and a foreground image displayed in a television broadcast from an external device. The display control unit 313 displays on the display 121 a screen in which the camera image and at least one of the background image and the foreground image are combined.

[0041] As shown in Fig. 5B, in a second example of the second embodiment, a cameraman uses a camera 101 to capture a subject with a chromakey shot against a specific background color (e.g., blue or green). A transmission unit 311 transmits an IP signal of a camera image 511 during chromakey shooting to a CCU 103. A reception unit 312 receives an IP signal of a background image 512 for chromakey compositing as a return signal from the CCU 103. A display control unit 313 decodes the return signal into the background image 512, and displays a screen 513 on the display 121, in which the camera image 511 and the background image 512 are chromakey composited.

[0042] According to the second example described above, the cameraman can simultaneously check camera image 511 being shot using chromakey shooting and background image 512 being displayed on television broadcast simply by looking at screen 513 shown in Fig. 5B. This allows the cameraman to adjust the shooting range, zoom, etc. of camera 101 so that the subject appears at an appropriate position in relation to background image 512. Note that on screen 513, camera image 511 and background image 512 may be displayed side-by-side or in picture-in-picture format, as in the first embodiment.

[0043] 5C, in a third example of the second embodiment, the transmitting unit 311 transmits an IP signal of a camera image 521 being captured to the CCU 103. The receiving unit 312 receives a foreground image 522 for AR (Augmented Reality) synthesis as a return signal from the CCU 103. The display control unit 313 decodes the return signal into the foreground image 522, and displays a screen 523 in which the camera image 521 and the foreground image 522 are synthesized on the display 121.

[0044] According to the third example described above, the cameraman can simultaneously check camera image 521 for AR synthesis and foreground image 522 displayed on television broadcast simply by looking at screen 523 shown in Fig. 5C. This allows the cameraman to adjust the shooting range and zoom of camera 101 so that the subject appears at an appropriate position in relation to foreground image 522. Note that on screen 523, camera image 521 and foreground image 522 may be displayed side-by-side or in picture-in-picture format, as in the first embodiment.

[0045] [Third embodiment] A third embodiment of the present disclosure will be described. Fig. 6 is an example of a screen displayed on the transmission device 102 according to the third embodiment. In the third embodiment, the transmission unit 311 compresses the camera video being shot using the same compression method as the video distributed in the television broadcast, and transmits the compressed video to an external device. In this example, the video of the television broadcast distributed from the broadcast station is compressed using H.264 / MPEG-4 AVC. Therefore, the transmission unit 311 compresses the HD-SDI camera video using H.264 / MPEG-4 AVC, and transmits the compressed video to the CCU 103.

[0046] 6, the display control unit 313 displays a screen 600 including a camera video 601 before compression in the transmission unit 311 and a camera video after compression (compressed video 602) on the display 121. For example, the display control unit 313 displays the HD-SDI camera video 601 being shot and the compressed video 602 obtained by compressing the camera video 601 using H.264 / MPEG-4 AVC on the screen 600 side-by-side.

[0047] 6, the cameraman can simultaneously check the camera image 601 being shot and the compressed image 602 obtained by compressing the camera image 601. The cameraman can visually grasp to what degree the camera image 601 will be compressed and how the image quality and color will change when the camera image 601 is used in a television broadcast. For example, the cameraman can compare the camera image 601 and the compressed image 602 and appropriately adjust functions such as edge enhancement of the camera 101 so as to obtain the desired image to be distributed.

[0048] In this embodiment, the compressed video 602 can be generated and displayed by utilizing the video compression function of the transmission device 102, and therefore the above function can be easily realized without the need to add a separate compression circuit for generating the compressed video 602. Note that the video compression method is not limited to H.264 / MPEG-4 AVC, and it is sufficient that the compressed video 602 is generated using the same method as the compression method for television distribution video (for example, MPEG-2 or H.265 (HEVC)).

[0049] [Fourth embodiment] A fourth embodiment of the present disclosure will be described. In the fourth embodiment, the transmission unit 311 transmits camera video and non-intercom audio to an external device using a first protocol that multiplexes compressed audio onto video. In this example, non-intercom audio, which is, for example, audio from a studio or concert venue to be filmed, is input to the transmission device 102 from a microphone provided on the camera 101 or an external microphone connected to the transmission device 102. The transmission unit 311 multiplexes the non-intercom audio onto the camera video using MPEG2-TS, converts it into an IP signal, and transmits it to the CCU 103.

[0050] The intercom control unit 314 (see FIG. 3) transmits and receives intercom audio with an external device using a second protocol that transmits only audio in an uncompressed manner, with a delay smaller than that of the first protocol. In this example, the intercom control unit 314 converts the intercom audio of the cameraman input from the intercom headset 360 into an uncompressed IP signal using RTP (Real-time Transport Protocol), and transmits it to the CCU 103. In addition, when the PHY 304 receives the intercom audio of an operator or the like from the CCU 103 using RTP, the intercom control unit 314 decodes the IP signal of the intercom audio and outputs it from the intercom headset 360.

[0051] In this embodiment, different protocols are used for non-intercom audio and intercom audio, and the non-intercom audio is multiplexed with the camera image and transmitted, whereas the intercom audio is transmitted uncompressed. This makes the intercom audio less susceptible to delays than the non-intercom audio, allowing, for example, a cameraman or operator to have a smooth intercom conversation with reduced audio delays.

[0052] [Fifth embodiment] A fifth embodiment of the present disclosure will be described. In the fifth embodiment, the tally control unit 315 (see FIG. 3) has at least one of a function of turning on or blinking the tally lamp 123 provided on the housing 120 of the transmission device 102 when a tally signal is received from an external device, and a function of displaying an image based on the tally signal on the display 121.

[0053] In this example, when the PHY 304 receives an IP signal of a tally signal from the CCU 103, the tally control unit 315 lights or blinks the tally lamp 123. Alternatively or in addition to this, the tally control unit 315 displays on the display 121 an image based on the tally signal, such as a message saying "The video from this camera is now on air" or an icon indicating that the video is now on air.

[0054] Thus, in this embodiment, the transmission device 102 has a tally display function and can receive tally signals over an IP line in the same way as other videos and signals. Therefore, even if the camera 101 is not provided with a tally display device, shooting work using a tally can be performed with the transmission device 102 without the need to prepare a separate tally display device.

[0055] [remarks] The present disclosure is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. The technical scope of the present invention also includes embodiments obtained by appropriately combining the technical means disclosed in the different embodiments. Furthermore, new technical features can be formed by combining the technical means disclosed in the respective embodiments.

[0056] In the above embodiment, a case has been exemplified in which functional blocks such as the transmitting unit 311, the receiving unit 312, the display control unit 313, the intercom control unit 314, and the tally control unit 315 are provided in the control unit 301 of the transmission device 102. Alternatively, some or all of these functional blocks may be provided in another electronic device connected to the transmission device 102. In this case, some or all of the processing described in the above embodiment is executed in the other electronic device connected to the transmission device 102, and the processing load of the transmission device 102 can be reduced. [Explanation of symbols]

[0057] 101 camera, 102 transmission device, 121 display, 311 transmission unit, 312 reception unit, 313 display control unit, 314 intercom control unit, 315 tally control unit

Claims

1. A transmission device that receives a video signal as a baseband signal from an external camera, converts it into an IP signal, and transmits the video, A transmission unit that transmits the camera image being captured received from the camera to a predetermined external device; A display provided on a housing of the transmission device. Transmission equipment.

2. A receiving unit that receives a return video currently on air in a television broadcast from the external device as an IP signal; and a display control unit that displays a screen including the return video on the display.

2. The transmission device according to claim 1.

3. The display control unit displays a screen including the camera image and the return image on the display.

3. The transmission device according to claim 2.

4. a receiving unit that receives information indicating a telop to be displayed in a television broadcast from the external device; and a display control unit that displays, on the display, a screen in which the telop is displayed superimposed on the camera image.

2. The transmission device according to claim 1.

5. a receiving unit that receives at least one of a background image and a foreground image displayed in a television broadcast from the external device; and a display control unit that displays, on the display, a screen obtained by combining the camera image with at least one of the background image and the foreground image.

2. The transmission device according to claim 1.

6. the transmitting unit compresses the camera video being shot using the same compression method as a distribution video of a television broadcast and transmits the compressed video to the external device; The display control unit displays a screen including the camera image before compression and the camera image after compression in the transmission unit on the display.

2. The transmission device according to claim 1.

7. The transmission unit transmits the camera image and the non-intercom audio to the external device using a first protocol that multiplexes compressed audio onto an image; An intercom control unit that transmits and receives intercom audio between the external device and the external device with a delay smaller than that of the first protocol using a second protocol that transmits only audio in an uncompressed manner.

2. The transmission device according to claim 1.

8. a tally control unit having at least one of a function of turning on or off a tally lamp provided on a housing of the transmission device when a tally signal is received from the external device, and a function of displaying an image based on the tally signal on the display; 2. The transmission device according to claim 1.

9. The display is provided on a first surface which is the widest of a plurality of side surfaces of the housing, a mounting portion for mounting the housing to the camera is provided on a second surface of the plurality of side surfaces, the second surface being different from the first surface; 2. The transmission device according to claim 1.

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