JP2007201784A - Television camera and base station device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a television camera and a base station device which set horizontal blanking widths according to the respective broadcasting standards to an SDI signal and VBS signal (or Y/C signal) and enhance stability of the horizontal blanking width added to the VBS signal (or Y/C signal). <P>SOLUTION: The television camera is equipped with two digital blanking circuit in total, a digital blanking circuit (first digital blanking circuit) 12 which adds horizontal blanking to a component video signal used for generation of the SDI signal and a blanking circuit (second digital blanking circuit) 15 which adds the horizontal blanking to the Y/C signal used for generation of the VBS signal. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a television camera and a base station apparatus.

  Now that digital television broadcasting has begun to be used in earnest, uncompressed component digital serial signals (SDI (Serial Digital Interface)) are used for video transmission within broadcast stations and are connected to television cameras. In addition to the conventional analog composite video signal (VBS (Video Burst and Sync signal)), an analog component video signal (RGB signal or Y, RY, BY signal) and SDI signal are received from the base station apparatus. Is output. The television camera outputs a component video signal and a VBS signal as video signals, and the base station device outputs the component video signal and the SDI signal together with the VBS signal.

Horizontal and vertical blanking is added to the above SDI signal and VBS signal (see, for example, Patent Document 1). The blanking addition process is performed by the digital blanking circuit on the digital component video signal before the VBS signal is generated.
JP 2000-134635 A (paragraph 0017)

  Here, the horizontal blanking width of the SDI signal is defined by the SMPTE-259M standard as about 10.2 μs, whereas that of the VBS signal is about 10.9 μs (RS-170A standard) for NTSC and about 12 for PAL. 0 μs (PAL-B standard). That is, the horizontal blanking width of the VBS signal is defined to be a value wider by 0.7 μs or more than that of the SDI signal.

  However, since the conventional blanking addition process is performed on the component video signal before generating the VBS signal, when generating both the SDI signal and the VBS signal from the component video signal, the horizontal blanking of each signal is performed. The ranking range had to be matched to one of the broadcasting standards.

  On the other hand, it is also conceivable to add horizontal blanking to the VBS signal separately from the component video signal. In this case, the process of adding horizontal blanking to the VBS signal is performed by an analog blanking circuit. However, the analog blanking circuit is more susceptible to product variations than the digital blanking circuit and is affected by the ambient temperature. There was a problem that it was easy to receive and lacked stability. The above problem is also valid when a Y / C signal is output from a television camera and a base station device instead of a VBS signal.

  Accordingly, the object of the present invention is to solve the above-described problems, and set a horizontal blanking width according to each broadcasting standard for the SDI signal and the VBS signal (or Y / C signal), and the VBS signal (or Y / C signal). It is an object of the present invention to provide a television camera and a base station apparatus that improve the stability of a horizontal blanking width added to a signal.

  In order to solve the above problems, in the television camera according to the present invention, horizontal blanking is added to the component video signal in the television camera that outputs the component video signal and the VBS signal or the Y / C signal. A first digital blanking circuit and a second digital blanking circuit for adding horizontal blanking to the VBS signal or Y / C signal are provided.

  Further, in the television camera according to the present invention, a signal processing circuit that generates and outputs a digital luminance signal and a color signal from the input component video signal, and the digital luminance output from the signal processing circuit And a digital blanking circuit for adding horizontal blanking to the signal and the color signal.

  In the base station apparatus according to the present invention, in the base station apparatus that inputs a component video signal and a VBS signal or a Y / C signal, the first blanking is added to the input component video signal. A digital blanking circuit; a second digital blanking circuit for adding horizontal blanking to the input VBS signal or Y / C signal; and converting the component video signal to which the horizontal blanking has been added into an SDI signal. An SDI conversion circuit and outputting the converted SDI signal simultaneously with the VBS signal or Y / C signal to which the horizontal blanking is added.

  In the television camera and the base station apparatus according to the present invention, the horizontal blanking width can be set for the SDI signal and the VBS signal (or Y / C signal) according to the respective broadcast standards. In addition, the stability of the horizontal blanking width added to the VBS signal (or Y / C signal) can be improved.

  The best mode for carrying out a television camera and a base station apparatus according to the present invention will be described below with reference to the drawings.

  FIG. 1 is a block diagram showing the configuration of a television camera and a base station apparatus according to the first embodiment of the present invention. Note that FIG. 1 mainly shows a video signal transmission path from the television camera to the base station apparatus.

  In FIG. 1, reference numeral 1 denotes a television camera, and reference numeral 2 denotes an imaging lens attached to the television camera 1. Reference numeral 3 denotes a camera adapter attached to the television camera 1, and reference numeral 4 denotes a base station device. The base station device 4 is connected to the camera adapter 3 via the multi-cable 5.

  Imaging light of a subject (not shown) incident from the imaging lens 2 is separated into three primary colors R (red), G (green), and B (blue) by the color separation prism 6 of the television camera 1. The R, G, B primary color lights color-separated by the color separation prism 6 are photoelectrically converted into R, G, B analog signals by the CCDs 7R, 7G, 7B.

  Component video signals (RGB signals) output from the CCDs 7R, 7G, and 7B are input to analog signal processing circuits 8R, 8G, and 8B, respectively. The analog signal processing circuits 8R, 8G, and 8B include a CDS (correlated double sampling) circuit and an AGC (automatic gain control) circuit, and perform various noise removal and gain control on the input component video signal.

  The component video signals output from the analog signal processing circuits 8R, 8G, and 8B are converted from analog signals to digital signals by the A / D conversion circuits 9R, 9G, and 9B, respectively. The digitized component video signal is input to a DSP (Digital Signal Processor) 10. The DSP 10 includes a digital signal processing circuit 11, a digital blanking circuit (first digital blanking circuit) 12, and an encoder circuit 13.

  The digital component video signal input to the DSP 10 is subjected to non-linear processing such as contour correction and gamma correction and image quality correction by the digital signal processing circuit 11 and then input to the digital blanking circuit 12 for horizontal and vertical blanking. Is added.

  FIG. 2 is an explanatory diagram showing the horizontal blanking addition process performed by the digital blanking circuit 12. In FIG. 2, the horizontal axis represents the horizontal sampling period of the CCD, and the vertical axis represents the video signal level.

  (1) in FIG. 2 is a video signal before horizontal blanking is added. In FIG. 2 (1), the period without the video signal is the period without the CCD readout signal, and is used as the black level reference signal.

  In the digital blanking circuit 12, a blanking pulse is first generated as shown in (2) of FIG. As shown in the figure, the falling and rising edges of the pulse correspond to the leading and trailing edges of blanking, respectively, and a predetermined slope is provided according to each broadcasting standard. Next, the level of the blanking pulse is compared with that of the video signal. If the level of the blanking pulse is higher than that of the video signal, the video signal is left as it is. Cut the signal. The hatched portion in the figure is a video signal cut by blanking processing. Through the above processing, a video signal to which horizontal blanking as shown in (3) of FIG. 2 is added is generated. The horizontal blanking width added to the component video signal by the digital blanking circuit 12 is set to a value (about 10.2 μs) based on the SMPTE-259M standard.

  Note that the blanking width of 10.2 μs added to the component video signal is only slightly wider than the blanking width of the CCD, and there is little margin. For this reason, the phase of horizontal blanking added to the component video signal is determined so as to be uniformly added by a predetermined width to both ends of the blanking of the CCD.

  Returning to the description of FIG. 1, the component video signal blanked by the digital blanking circuit 12 is output from the DSP 10 and input to the D / A conversion circuit 14. The component video signal input to the D / A conversion circuit 14 is converted from a digital signal to an analog signal there and output from the television camera 1. The component video signal output from the television camera 1 is later converted into an SDI signal by the base station device 4.

  The component video signal blanked by the digital blanking circuit 12 is also input to the encoder circuit 13 of the DSP 10. When the input component video signal is an RGB signal, the encoder circuit 13 generates a wideband luminance signal Y and narrowband color difference signals BY and RY. Both the luminance signal Y and the color difference signals RY and BY are digital signals. Each of the color difference signals RY and BY is modulated by a subcarrier having a predetermined frequency, and then multiplexed to generate a color signal (chroma signal) C. The luminance signal Y is delayed by a delay circuit (not shown) in accordance with the delay of the color signal C generated by band limitation by filtering.

  The digital luminance signal Y and color signal C generated by the encoder circuit 13 are output from the DSP 10 and input to a digital blanking circuit (second digital blanking circuit) 15.

  The digital blanking circuit 15 is configured by a digital circuit such as an FPGA (Field Programmable Gate Array), for example, and performs blanking on the luminance signal Y and the color signal C by performing the same processing as described with reference to FIG. Append.

  With reference to FIG. 3, the horizontal blanking addition process performed by the digital blanking circuit 15 will be described. (1) in FIG. 3 is a video signal to which horizontal blanking is added by the digital blanking circuit 12. First, a blanking pulse is generated as shown in (2) of FIG. Next, the level of the blanking pulse and the video signal is compared. If the level of the blanking pulse is higher than that of the video signal, the video signal is left as it is. If the level of the blanking pulse is lower than that of the video signal, the video signal is reversed. To cut. The hatched portion in the figure is a video signal cut by blanking processing. Through the above processing, a video signal to which horizontal blanking as shown in (3) of FIG. 3 is added is generated.

  The horizontal blanking width added to the component video signal by the digital blanking circuit 12 is set to a value narrower than the horizontal blanking width added to the luminance signal Y and the color signal C by the digital blanking circuit 15. . Specifically, the horizontal blanking width added to the component video signal by the digital blanking circuit 12 is 10.2 μs of the SMPTE-259M standard, whereas the digital blanking circuit 15 uses the luminance signal Y and the color signal. The horizontal blanking width added to C is set to 10.9 μs of the RS-170A standard for NTSC and 12.0 μs of the PAL-B standard for PAL.

  The luminance signal Y and the color signal C are multiplexed later to generate a VBS signal (composite video signal), but the video center of the SDI signal and the video center of the VBS signal must match. Therefore, the horizontal blanking phase of the luminance signal Y and the color signal C has a predetermined width (0.35 μs in the case of NTSC, PAL) at both ends of the horizontal blanking added to the component video signal used for generating the SDI signal. In this case, it is determined so that 0.9 μs) is added evenly.

  Continuing with FIG. 1, the luminance signal Y and the color signal C blanked by the digital blanking circuit 15 are input to the D / A conversion circuit 16 and converted from digital signals to analog signals. The luminance signal Y and the color signal C converted into analog signals are input to the multiplexing circuit 17 and multiplexed there to generate a VBS signal.

  The analog component video signal and the VBS signal generated by the television camera 1 are input to the camera adapter 3, where the current is amplified, and then input to the base station device 4 via the multi-cable 5.

  The component video signal and the VBS signal input to the base station device 4 are input to the cable correction circuit 18 where the high frequency components attenuated when passing through the multi-cable 5 are corrected. Of the component video signal and VBS signal output from the cable correction circuit 18, the component video signal is converted into an SDI signal by the serial digital conversion circuit 19. The SDI signal and the VBS signal are current-amplified and then simultaneously output from the base station device 4 to a subsequent device (for example, a control panel).

  In the above description, the VBS signal is generated by multiplexing the luminance signal Y and the color signal C. However, the Y / C signal may be output as it is from the television camera 1 and the base station device 4.

  In addition, although RGB signals are used as component video signals, Y, RY, and BY signals may be used. In that case, the encoder circuit 13 does not need to generate the color difference signals RY and BY.

  In the above description, the video signal processing is performed by the digital blanking circuit 15 including the DSP 10 and the FPGA, but all processing may be performed by an integrated circuit such as a DSP or FPGA.

  Further, the transmission of the component video signal from the television camera 1 to the base station apparatus 4 may be any system such as baseband, FM modulation / demodulation, AM modulation / demodulation, and optical transmission.

  Further, blanking is added to each video signal by the television camera 1, but the base station device 4 is provided with a circuit similar to the DSP 10 and the digital blanking circuit 15 before the SDI conversion circuit 19. The base station device 4 may add blanking to each video signal.

  Thus, in the television camera 1 according to the first embodiment of the present invention, the digital blanking circuit (first digital blanking circuit) for adding horizontal blanking to the digital component video signal used for generating the SDI signal. A total of two digital blanking circuits (a blanking circuit) 12 and a digital blanking circuit (second digital blanking circuit) 15 for adding horizontal blanking to the digital Y / C signal used to generate the VBS signal. Therefore, it is possible to set a horizontal blanking width in accordance with each broadcasting standard for the SDI signal and the VBS signal or the Y / C signal. Specifically, the horizontal blanking width added to the component video signal can be set to a value compliant with the SMPTE-259M standard, while the horizontal blanking width added to the VBS signal or Y / C signal is set to RS-170A. It can be set to a value compliant with the standard or PAL-B standard.

  Also, a DSP 10 that generates a digital luminance signal Y and a color signal C from the component video signal and outputs a Y / C signal, and a digital blanking that adds horizontal blanking to the digital Y / C signal output from the DSP 10. Since the circuit 15 is provided, horizontal blanking can be added to the digital Y / C signal. Therefore, the stability of the horizontal blanking width added to the VBS signal or Y / C signal can be improved.

  Further, in the digital blanking circuit 12 in the DSP 10, the horizontal blanking width (that is, a value that conforms to the RS-170A standard or the PAL-B standard) added by the digital blanking circuit 15 (that is, a value that is narrower than the horizontal blanking width). In other words, since the Y / C signal is generated from the component video signal by adding a value compliant with the SMPTE-259M standard) to the component video signal, the horizontal blanking width compliant with the SMPTE-259M standard is defined as the component. After being added to the video signal, a horizontal blanking width based on the RS-170A standard or the PAL-B standard can be further added to the VBS signal or the Y / C signal.

  In the base station apparatus 4 according to the present invention, the component video signal to which the horizontal blanking width is added from the television camera 1 and the VBS signal or Y / C signal to which the horizontal blanking width is added. Since it is configured to receive the input, convert the input component video signal into an SDI signal, and output the SDI signal simultaneously with the VBS signal or Y / C signal, horizontal blanking suitable for each broadcasting standard is added. The SDI signal and the VBS signal or Y / C signal can be supplied to the subsequent device.

  Even if the DSP 10 mounted on the television camera 1 and the digital blanking circuit 15 are provided in the base station apparatus 4 and blanking addition processing is performed in the base station apparatus 4, the same effect as described above can be obtained. be able to.

  Next, a television camera and a base station apparatus according to the second embodiment of the present invention are described.

  FIG. 4 is a block diagram similar to FIG. 1 showing the configuration of the television camera and the base station apparatus according to the second embodiment. Hereinafter, differences from the first embodiment will be described with reference to FIG. In addition, about the structure functionally similar to 1st Example, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In a system in which the SDI signal and the VBS signal or Y / C signal coexist, the horizontal blanking width of the SDI signal may need to match that of the VBS signal or Y / C signal. Therefore, in the second embodiment, the horizontal blanking width added to the component video signal by the digital blanking circuit in the DSP is made variable.

  As shown in FIG. 4, the television camera 100 according to the present embodiment includes an operation key (blanking width input unit) 101 such as a cross key, and a viewfinder 102. The operation keys 101 and the viewfinder 102 are connected to a CPU 103 provided in the television camera 100, respectively.

  The CPU 103 displays a menu screen on the viewfinder 102 in accordance with the operation of the operation key 101 by the operator. The viewfinder 102 displays a horizontal blanking width setting screen as one of various parameter setting screens. On the setting screen for the horizontal blanking width, SMPTE-259M and RS-170A (or PAL-B) are displayed as horizontal blanking standards to be added to the component video signal by the digital blanking circuit 12 in the DSP 10. . The operator designates (inputs) a standard (horizontal blanking width) to be used by operating the operation key 101. The CPU 103 sets (changes) the horizontal blanking width to be added to the component video signal by the digital blanking circuit 12 to the horizontal blanking width designated by the operator via the operation key 101.

  That is, the blanking width added to the component video signal by the digital blanking circuit 12 is 10.2 μs based on SMPTE-259M and 10.9 μs based on RS-170A according to the operation of the operation key 101 by the operator. (Or 12.0 μs based on PAL-B).

  When the horizontal blanking width added by the digital blanking circuit 12 is set to a value conforming to RS-170A or PAL-B, the horizontal blanking width is further increased by the subsequent digital blanking circuit 15. Therefore, the digital blanking circuit 15 does not substantially function (the blanking width of the luminance signal Y and the color signal C does not change).

  As described above, the television camera 100 according to the second embodiment of the present invention includes the operation key 101 for inputting the horizontal blanking width designated by the operator, and the component blanking in the digital blanking circuit 12. Since the horizontal blanking width added to the signal is set to the specified horizontal blanking width, in addition to the effects described in the first embodiment, the degree of freedom in setting the horizontal blanking width of the component video signal. Can be improved.

  In the second embodiment, the menu screen is displayed on the viewfinder 102. However, a monitor may be connected to the television camera 100 and displayed there.

It is a block diagram showing the structure of the television camera and base station apparatus which concern on 1st Example of this invention. It is explanatory drawing showing the addition process of the horizontal blanking performed by the digital blanking circuit (1st digital blanking circuit) shown in FIG. It is explanatory drawing showing the addition process of the horizontal blanking performed by the digital blanking circuit (2nd digital blanking circuit) shown in FIG. It is a block diagram showing the structure of the television camera and base station apparatus which concern on 2nd Example of this invention.

Explanation of symbols

1: Television camera, 4: Base station device, 10: DSP, 12: Digital blanking circuit (first digital blanking circuit), 15: Digital blanking circuit (second digital blanking circuit), 101: Operation key (Blanking width input means)

Claims (6)

In a television camera that outputs component video signals and VBS signals or Y / C signals,
A first digital blanking circuit for adding horizontal blanking to the component video signal;
A second digital blanking circuit for adding horizontal blanking to the VBS signal or Y / C signal;
A television camera comprising: The television camera according to claim 1, wherein
The horizontal blanking width added to the component video signal is set to a value compliant with the SMPTE-259M standard, while the horizontal blanking width added to the VBS signal or Y / C signal is the RS-170A standard. Alternatively, the television camera is set to a value compliant with the PAL-B standard. The television camera according to claim 1 or 2,
Blanking width input means for inputting a horizontal blanking width designated by an operator of the television camera;
And the first digital blanking circuit changes a blanking width added to the component video signal to a horizontal blanking width designated by the operator. A signal processing circuit that generates and outputs a digital luminance signal and a color signal from the input component video;
A digital blanking circuit for adding horizontal blanking to the luminance signal and the color signal output from the signal processing circuit;
A television camera comprising: The television camera according to claim 4.
The signal processing circuit adds horizontal blanking narrower than a horizontal blanking width added by the digital blanking circuit to the component video signal, and the luminance from the component video signal to which the horizontal blanking is added. A television camera for generating a signal and the color signal. In a base station device to which a component video signal and a VBS signal or a Y / C signal are input,
A first digital blanking circuit for adding horizontal blanking to the input component video signal;
A second digital blanking circuit for adding horizontal blanking to the input VBS signal or Y / C signal;
An SDI conversion circuit for converting the component video signal to which the horizontal blanking is added into an SDI signal;
And a base station apparatus that outputs the converted SDI signal simultaneously with the VBS signal or Y / C signal to which the horizontal blanking is added.

Images