SDI signal acquisition card with HDMI output module

Abstract

The utility model provides an SDI (Serial Digital Interface) signal acquisition card with an HDMI (High Definition Multimedia Interface) output module, which comprises an SDI signal module, a video processing and converting module, a master control module and the HDMI output module, the video processing and converting module is respectively connected with the SDI signal module and the master control module, and the HDMI output module is connected with the master control module; the SDI signal module comprises an SDI signal input module and an SDI output module; the video processing conversion module comprises a video processing module, a video conversion module and a single-chip microcomputer control module. The video processing module is connected with the SDI signal input module, the SDI signal output module, the video conversion module and the single-chip microcomputer control module. And the video conversion module is connected with the main control module. The signal acquisition card provided by the utility model is provided with the HDMI output interface and the USB interface, so that the signal acquisition card is more convenient to use; and two paths of sound input and two paths of sound output are also provided, so that the requirements of various actual use conditions can be met.

Description

Technical Field

[0001] The utility model relates to a signal acquisition card, in particular to an SDI signal acquisition card with an HDMI output module. Background Art

[0002] SDI signal acquisition card is a device that collects SDI signals to personal computers or laptops. SDI is the abbreviation of Serial Digital Interface, which is a serial digital interface; SDI signal is a serial digital interface signal. SDI signals include not only image signals but also sound signals. Some SDI acquisition cards will add an SDI OUT function, that is, the SDI IN signal can be directly passed to SDI OUT, which is the SDI loop-out function. SDI OUT can be used as the SDI signal source of other devices. At present, most SDI OUT interfaces use BNC interfaces (BNC is the abbreviation of Bayonet Nut Connector, which refers to a coaxial cable connection connector), but display devices with built-in BNC interfaces, such as monitors or TVs, are not common in the market, and it is not convenient to collect signals to the computer for display, preview, recording and editing. In actual applications, most display devices such as monitors or TVs are compatible with HDMI interfaces, because HDMI interfaces can transmit image signals and sound signals, which is more convenient to use, but the SDI signal acquisition cards currently on the market do not support HDMI output. In addition, in actual use, it is necessary to add multiple channels of sound as input while collecting signals, and multiple output interfaces are also required for sound output. The existing SDI signal acquisition card cannot well meet the needs of the above actual use situations. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide an SDI signal acquisition card with an HDMI output module, aiming to integrate hardware modules and provide a variety of acquisition signal input and output interfaces to meet the needs of various actual usage situations.

[0004] To this end, the utility model provides an SDI signal acquisition card with an HDMI output module, comprising an SDI signal module, a video processing conversion module, a main control module and an HDMI output module, wherein the video processing conversion module is respectively connected to the SDI signal module and the main control module, and the HDMI output module is connected to the main control module; the SDI signal module comprises an SDI signal input module and an SDI output module; the video processing conversion module comprises a video processing module, a video conversion module and a single-chip control module; the video processing module is respectively connected to the SDI signal input module, the SDI signal output module, the video conversion module and the single-chip control module; and the video conversion module is connected to the main control module.

[0005] A further improvement of the utility model is that the video processing module comprises a YUV video signal interface and a sound output signal interface, and the YUV video signal interface and the sound output signal interface are respectively connected to the video conversion module.

[0006] A further improvement of the utility model is that the video conversion module includes an HDMI output interface, and the HDMI output interface is connected to the main control module.

[0007] A further improvement of the utility model is that it also includes an audio line input module, an analog-to-digital conversion module and an earphone and microphone interface module; the analog-to-digital conversion module is connected to the main control module, the audio line input module and the earphone and microphone interface module respectively.

[0008] A further improvement of the utility model is that the analog-to-digital conversion module includes a first analog-to-digital conversion module and a second analog-to-digital conversion module; the first analog-to-digital conversion module is respectively connected to the audio line input module and the main control module; the second analog-to-digital conversion module is respectively connected to the headphone microphone interface module and the main control module.

[0009] A further improvement of the utility model is that it also includes a digital-to-analog conversion module and a sound output interface module; the digital-to-analog conversion module includes a first digital-to-analog conversion module and a second digital-to-analog conversion module; the first digital-to-analog conversion module is respectively connected to the headphone microphone interface module and the main control module; the second digital-to-analog conversion module is respectively connected to the main control module and the sound output interface module.

[0010] A further improvement of the utility model is that it also includes a USB interface module, and the USB interface module is connected to the main control module.

[0011] A further improvement of the utility model is that the main control module includes I 2 S input interface, the I 2The S input interface is connected to the first analog-to-digital conversion module and the second analog-to-digital conversion module respectively.

[0012] A further improvement of the utility model is that the main control module includes I 2 S output interface, the I 2 The S output interface is connected to the first digital-to-analog conversion module and the second digital-to-analog conversion module respectively.

[0013] Compared with the prior art, the utility model has the following beneficial effects: the utility model proposes an SDI signal acquisition card with an HDMI output module, which provides a commonly used HDMI output interface and a USB interface to collect signals to a computer, making it more convenient to use and highly applicable. In addition, the signal acquisition card can further provide two-way sound input and two-way sound output, providing a hardware foundation for adding background music and voice-over dubbing when collecting signals, and can output sounds to different devices, meeting the needs of a variety of practical usage situations. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a circuit principle block diagram of an embodiment of the utility model;

[0015] Figure 2 It is a schematic diagram of an SDI signal module of an embodiment of the utility model;

[0016] Figure 3 It is a schematic diagram of a main control module of an embodiment of the utility model;

[0017] Figure 4 It is a schematic diagram of a video processing module of an embodiment of the utility model;

[0018] Figure 5 It is a schematic diagram of a video conversion module of an embodiment of the utility model;

[0019] Figure 6 It is a schematic diagram of a single chip control module of an embodiment of the utility model;

[0020] Figure 7 This is a schematic diagram of an HDMI output module according to an embodiment of the present utility model;

[0021] Figure 8 It is a schematic diagram of an audio line input module of an embodiment of the utility model;

[0022] Fig. 9 It is a schematic diagram of an analog-to-digital conversion module of an embodiment of the utility model;

[0023] Fig.10It is a schematic diagram of a headphone and microphone interface module of an embodiment of the utility model;

[0024] Fig.11 It is a schematic diagram of a digital-to-analog conversion module of an embodiment of the utility model;

[0025] Fig.12 It is a schematic diagram of a sound output interface module of an embodiment of the utility model;

[0026] Fig.13 The utility model is a schematic diagram of a USB interface module according to an embodiment of the present invention.

[0027] Figure identification: 1-SDI signal module; 101-SDI signal input module; 102-SDI signal output module; 2-video processing conversion module; 201-video processing module; 2011-YUV video signal interface; 2012-sound output signal interface; 202-video conversion module; 2021-HDMI output interface; 203-single chip control module; 3-main control module; 301-I 2 S input interface; 302-I 2 S output interface; 4-HDMI output module; 5-audio line input module; 6-analog-to-digital conversion module; 601-first analog-to-digital conversion module; 602-second analog-to-digital conversion module; 7-headphone and microphone interface module; 8-digital-to-analog conversion module; 801-first digital-to-analog conversion module; 802-second digital-to-analog conversion module; 9-USB interface module; 10-sound output interface module. DETAILED DESCRIPTION

[0028] In the description of the present invention, if there is a description of orientation, for example, the orientation or position relationship indicated by "upper", "lower", "front", "back", "left", "right", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. If a certain technical feature is referred to as "set", "fixed", "connected", or "installed" on another technical feature, it can be directly set, fixed, or connected to the other technical feature, or it can be indirectly set, fixed, connected, or installed on the other technical feature.

[0029] In the description of the present utility model, if "several" is involved, it means more than one; if "multiple" is involved, it means more than two; if "greater than", "less than", or "exceed" is involved, it should be understood as not including the number itself; if "above", "below", or "within" is involved, it should be understood as including the number itself. If "first", "second", etc. are involved, they should be understood as being used only to distinguish the names of the same or similar technical features, and should not be understood as implying / indicating the relative importance of the technical features, the number of the technical features, or the order of the technical features.

[0030] The following is a further detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings:

[0031] like Figures 1 to 13 As shown, this embodiment provides a method including an SDI signal module 1, a video processing conversion module 2, a main control module 3 and an HDMI output module 4, wherein the video processing conversion module 2 is respectively connected to the SDI signal module 1 and the main control module 3, and the HDMI output module 4 is connected to the main control module 3; the SDI signal module 1 includes an SDI signal input module 101 and an SDI output module 102; the video processing conversion module 2 includes a video processing module 201, a video conversion module 202 and a single-chip control module 203; the video processing module 201 is respectively connected to the SDI signal input module 101, the SDI signal output module 102, the video conversion module 202 and the single-chip control module 203; the video conversion module 202 is connected to the main control module 3.

[0032] like Figure 4 and Figure 5 As shown, in this embodiment, the video processing module 201 includes a YUV video signal interface 2011 and a sound output signal interface 2012, and the YUV video signal interface 2011 and the sound output signal interface 2012 are respectively connected to the video conversion module 202.

[0033] like Figure 3 and Figure 5 As shown, the video conversion module 202 includes an HDMI output interface 2021 , and the HDMI output interface 2021 is connected to the main control module 3 .

[0034] In this embodiment, U3 in the main control module 3 is preferably the main control chip LK131, U28 in the video processing module 201 is preferably the video processing chip GS2971A, U30 in the video conversion module 202 is preferably the video conversion chip CV8788, and U31 in the single-chip control module 203 is preferably the single-chip STM32F030. It should be explained that YUV is a color encoding method, "Y" represents brightness (Luminance or Luma), that is, the grayscale value, and "U" and "V" represent chrominance (Chrominance or Chroma). SDI is the abbreviation of Serial Digital Interface, that is, serial digital interface; SDI signal, that is, serial digital interface signal. BNC is the abbreviation of Bayonet Nut Connector, which refers to a coaxial cable connection connector.

[0035] More specifically, Figures 1 to 7 As shown, the SDI input signal SDI-IN of this embodiment is connected through the BNC connector P1 of the SDI signal input module 101. Preferably, as Figure 2 and Figure 4 As shown, in this embodiment, the 75 ohm single-ended impedance matching of the SDI signal input module 101 is preferably used to convert the signals into double-ended signals SDI+ and SDI-, and then input into the video processing chip U28 in the video processing module 201. After the video processing chip U28 processes the input signal, it outputs one of the SDI signals SDOUT+ and SDOUT- to the SDI signal output module 102. The SDI signal output module 102 performs 75 ohm single-ended impedance matching on the double-ended signals SDOUT+ and SDOUT- and converts them into single-ended signals SDI-OUT, and then outputs the SDI signal through the BNC connector P2; the U29 chip in the SDI signal output module 102 preferably adopts the GV8500-CNTE3 chip; the above can be achieved by Figure 2 and Figure 4The hardware circuit shown is used to realize the above. Another SDI signal is processed to generate a YUV video signal and a sound signal, and is output to the video conversion chip U30 of the video conversion module 202 through the YUV video signal interface 2011 and the sound output signal interface 2012. The YUV video signal interface 2011 is the interface of the YUV video signals Y0~Y7, UV0~UV7, PCLK, VSOUT and HSOUT output by the video processing chip U28. The sound output signal interface 2012 is the interface of the sound signals TX-WS, TX-SD0, TX-SD1, TX-SD2, TX-SD3, TX-SCK and TX-MCLK output by the video processing chip U28. The single-chip microcomputer U31 in the single-chip microcomputer control module 203 communicates with the video processing chip U28, controls the video processing chip U28 to generate a YUV video signal and a sound output signal, and transmits them to the video conversion chip U30 through the YUV video signal interface 2011 and the sound output signal interface 2012. After a series of data processing, the video conversion chip U30 converts the signal into HDMI signals HDMIRXCP, HDMIRXCN, HDMIRX0P, HDMIRX0N, HDMIRX1P, HDMIRX1N, HDMIRX2P and HDMIRX2N, and inputs the HDMI signal to the main control chip U3 of the main control module 3 through the HDMI output interface 2021. Finally, the main control chip U3 outputs the HDMI signal to other devices such as a display or a TV through the HDMI connector J2 of the HDMI output module 4 connected to it. In the HDMI output module 4 described in this embodiment, the U7 chip and the U8 chip preferably use an ESD protection chip, for example, the chip model that can be preferably used is RClamp0524P.

[0036] It can be seen that the SDI signal acquisition card with HDMI output module proposed in this embodiment, in addition to using the BNC connector to output the SDI signal, also adds an HDMI signal output interface, which better supports display devices such as monitors and TVs and is more convenient to use.

[0037] like Figures 8 to 10 As shown, this embodiment also preferably includes an audio line input module 5, an analog-to-digital conversion module 6 and an earphone and microphone interface module 7; the analog-to-digital conversion module 6 is connected to the main control module 3, the audio line input module 5 and the earphone and microphone interface module 7 respectively.

[0038] like Figure 3 , Figures 8 to 10As shown, the analog-to-digital conversion module 6 includes a first analog-to-digital conversion module 601 and a second analog-to-digital conversion module 602; the first analog-to-digital conversion module 601 is respectively connected to the audio line input module 5 and the main control module 3; the second analog-to-digital conversion module 602 is respectively connected to the headphone microphone interface module 7 and the main control module 3.

[0039] like Figure 3 , Figures 10 to 12 As shown, this embodiment also includes a digital-to-analog conversion module 8 and a sound output interface module 10; the digital-to-analog conversion module 8 includes a first digital-to-analog conversion module 801 and a second digital-to-analog conversion module 802; the first digital-to-analog conversion module 801 is respectively connected to the headphone microphone interface module 7 and the main control module 3; the second digital-to-analog conversion module 802 is respectively connected to the main control module 3 and the sound output interface module 10.

[0040] More specifically, in this embodiment, two sound inputs are added. The first sound input is connected through the audio input plug J4 of the audio line input module 5, and can be connected to an external sound card or other audio input source. The audio line input module 5 outputs audio signals AINL1 and AINR1 to the first analog-to-digital conversion module 601 in the analog-to-digital conversion module 6. U9 of the first analog-to-digital conversion module 601 is preferably an analog-to-digital conversion chip ES7240S. The analog-to-digital conversion chip U9 converts the audio analog signal into a digital signal, which is connected to the main control module 3 through signal lines I2SMCLK_OUT, I2SIN_SD1, I2SIN_SCLK and I2SIN_WS.

[0041] The second sound input is connected to the microphone through the headphone microphone connector J3 of the headphone microphone interface module 7. The microphone receives the sound input signal. The headphone microphone interface module 7 outputs the microphone's audio signals AINL0, AINR0 and MICBIAS to the second analog-to-digital conversion module 602 in the analog-to-digital conversion module 6. The U10 of the second analog-to-digital conversion module 602 is preferably an analog-to-digital conversion chip ES8218E. The analog-to-digital conversion chip U10 converts the audio analog signal into a digital signal and connects to the main control module 3 through signal lines I2SMCLK_OUT, I2SIN_SD0, I2SIN_SCLK, I2SIN_WS, ES8218E_SDA and ES8218E_SCL. In this embodiment, the first sound input facilitates the addition of background music when collecting SDI signals, and the second sound input facilitates the addition of narration and dubbing and other sounds when collecting SDI signals. The chip U15 in the headphone microphone interface module 7 preferably adopts the SGM2549D chip.

[0042] In addition, in this embodiment, two sound outputs are added. The first sound output is connected by the main control module 3 through the signal lines I2SMCLK_OUT, I2SOUT_SD0, I2SOUT_SCLK and I2SOUT_WS to the digital-to-analog conversion chip U11 or U13 that inputs the digital signal to the first digital-to-analog conversion module 801; after the first digital-to-analog conversion module 801 converts the digital signal into a sound signal, it outputs the sound signal to the headphone microphone interface module 7 through the signal lines A_LOUT and A_ROUT, and the headphone microphone interface module 7 outputs the sound signal through the external headphone device through the plug J3. Among them, the digital-to-analog conversion chip U11 is preferably MS7124, and the digital-to-analog conversion chip U13 is preferably CS4344. In this embodiment, either the digital-to-analog conversion chip U11 or the digital-to-analog conversion chip U13 can be selected.

[0043] The second sound output is connected by the main control module 3 through the signal lines I2SMCLK_OUT, I2SOUT_SD1, I2SOUT_SCLK and I2SOUT_WS to the digital-to-analog conversion chip U12 or U14 that inputs the digital signal to the second digital-to-analog conversion module 802; after the second digital-to-analog conversion module 802 converts the digital signal into a sound signal, it outputs the sound signal to the sound output interface module 10 through the signal lines Speaker_LOUT and Speaker_ROUT, and the sound output interface module 10 outputs the sound signal through the external audio, computer and other equipment via the connector J5. Among them, the digital-to-analog conversion chip U12 is preferably MS7124, and the digital-to-analog conversion chip U14 is preferably CS4344. In this embodiment, either the digital-to-analog conversion chip U12 or the digital-to-analog conversion chip U14 can be selected. In this embodiment, the first sound output can output the sound signal of the collected SDI signal source to the headphone microphone; the second sound output can output the sound signals of the first sound input, the second sound input and the collected SDI signal to the sound output interface module 10 after sound mixing in the main control chip U3 of the main control module 3, and output the sound signal through external audio, computer and other equipment.

[0044] It can be seen that the two-way sound input and two-way sound output provided in this embodiment can add background music, voice-over and other sounds when collecting signals, and can output the sounds to different devices at the same time, which can meet the needs of various actual usage scenarios.

[0045] like Figure 3 and Fig.13 As shown, this embodiment further includes a USB interface module 9 , and the USB interface module 9 is connected to the main control module 3 .

[0046] More specifically, the SDI input signal enters the main control chip U3 after passing through the SDI signal module 1 and the video processing conversion module 2. The main control chip U3 can convert the SDI input signal into a UVC video signal and a UAC audio signal. The main control chip U3 has a USB3.0 output interface. U3 is connected to the USB connection connector J6 of the USB interface module 9 through the USB3.0 output interface DM, DP, SSTXM, SSTXP, SSRXM and SSRXP, and outputs the signal to the computer end. Among them, UVC (USB Video Class) is a standard for controlling and transmitting video data, and UAC (USB Audio Class) is a standard for controlling and transmitting audio data. It can be seen that this embodiment can collect SDI input signals including video signals and audio signals to the computer end through the USB3.0 interface, which is convenient for preview, recording and editing, and more convenient to use.

[0047] like Figure 3 and Fig. 9 As shown, the main control module 3 includes I 2 S input interface 301, the I 2 The S input interface 301 is connected to the first analog-to-digital conversion module 601 and the second analog-to-digital conversion module 602 respectively.

[0048] like Figure 3 and Fig.11 As shown, the main control module 3 includes I 2 S output interface 302, the I 2 The S output interface 302 is connected to the first digital-to-analog conversion module 801 and the second digital-to-analog conversion module 802 respectively.

[0049] More specifically, in this embodiment, the two-way sound input signal is respectively input to the analog-to-digital conversion module 6 through the audio line input module 5 and the headphone microphone interface module 7; the analog-to-digital conversion module 6 converts the analog signal of the sound into a digital signal; the first analog-to-digital conversion module 601 and the second analog-to-digital conversion module 602 communicate with the I2SIN_SD0, I2SIN_SD1, I2SIN_SCLK and I2SIN_WS through the signal lines. 2 The S input interface 301 is connected to the main control chip U3 of the main control module 3 and inputs the signal.

[0050] Main control chip U3 2The S output interface 302 is connected to the digital-to-analog conversion module 8 through signal lines I2SOUT_SD0, I2SOUT_SD1, I2SOUT_SCLK and I2SIN_WS; the first digital-to-analog conversion module 801 and the second digital-to-analog conversion module 802 convert digital signals into analog signals of sound, and output two sound signals through the connected headphone microphone interface module 7 and the sound output module 10 respectively.

[0051] In summary, the utility model proposes an SDI signal acquisition card with an HDMI output module, which provides a commonly used HDMI output interface and a USB interface to facilitate signal acquisition to a computer, making it more convenient to use. In addition, the signal acquisition card also provides two-way sound input and two-way sound output, which can add background music and voice-over dubbing when acquiring signals, and can output the sound to different devices, meeting the needs of a variety of practical use situations.

[0052] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. An SDI signal acquisition card with an HDMI output module, characterized in that: It includes an SDI signal module, a video processing conversion module, a main control module and an HDMI output module, wherein the video processing conversion module is respectively connected to the SDI signal module and the main control module, and the HDMI output module is connected to the main control module; the SDI signal module includes an SDI signal input module and an SDI output module; the video processing conversion module includes a video processing module, a video conversion module and a single-chip control module; the video processing module is respectively connected to the SDI signal input module, the SDI signal output module, the video conversion module and the single-chip control module; the video conversion module is connected to the main control module.

2. According to the SDI signal acquisition card with HDMI output module in claim 1, the video processing module comprises a YUV video signal interface and a sound output signal interface, and the YUV video signal interface and the sound output signal interface are respectively connected to the video conversion module.

3. According to the SDI signal acquisition card with HDMI output module in claim 2, the video conversion module comprises an HDMI output interface, and the HDMI output interface is connected to the main control module.

4. The SDI signal acquisition card with HDMI output module according to claim 1, characterized in that: It also includes an audio line input module, an analog-to-digital conversion module and an earphone and microphone interface module; the analog-to-digital conversion module is connected to the main control module, the audio line input module and the earphone and microphone interface module respectively.

5. The SDI signal acquisition card with HDMI output module according to claim 4, characterized in that: The analog-to-digital conversion module includes a first analog-to-digital conversion module and a second analog-to-digital conversion module; the first analog-to-digital conversion module is connected to the audio line input module and the main control module respectively; the second analog-to-digital conversion module is connected to the headphone and microphone interface module and the main control module respectively.

6. The SDI signal acquisition card with HDMI output module according to claim 5, characterized in that: It also includes a digital-to-analog conversion module and a sound output interface module; the digital-to-analog conversion module includes a first digital-to-analog conversion module and a second digital-to-analog conversion module; the first digital-to-analog conversion module is respectively connected to the headphone microphone interface module and the main control module; the second digital-to-analog conversion module is respectively connected to the main control module and the sound output interface module.

7. The SDI signal acquisition card with HDMI output module according to any one of claims 1 to 6, characterized in that: It also includes a USB interface module, which is connected to the main control module.

8. The SDI signal acquisition card with HDMI output module according to claim 5, wherein the main control module comprises I 2 S input interface, the I 2 The S input interface is connected to the first analog-to-digital conversion module and the second analog-to-digital conversion module respectively.

9. The SDI signal acquisition card with HDMI output module according to claim 6, wherein the main control module comprises I 2 S output interface, the I 2 The S output interface is connected to the first digital-to-analog conversion module and the second digital-to-analog conversion module respectively.

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