JPH08125903A - Television camera device - Google Patents

Abstract

PURPOSE: To perform digital transmission between a camera head and a CCU. CONSTITUTION: In the camera head 11, RGB digital video signals and the sound/ command signals of a low rate are time division multiplexed in a P/S converter 115, converted into optical signals in an E/O converter 117, passed through the outgoing line 131 of an optical fiber cable 13 and transmitted to the CCU 12. In the CCU 12, by photoelectrically converting the inputted optical signals in an O/E converter 121 and making them parallel in an S/P converter 123, the RGB digital video signals and the sound/command signals of the low rate are obtained. It is similar on the side of an incoming line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television camera device mainly used for broadcasting, and in particular, uses an optical transmission system for signal transmission between a camera head and a camera control unit (hereinafter referred to as CCU). Regarding

[0002]

2. Description of the Related Art As is well known, the adoption of the EDTV-2 system has been decided for television broadcasting in order to provide high-definition images, and it is shifting to a wide aspect era. Therefore, in future television camera devices, digital transmission between the camera head and the CCU is essential in order to realize high performance as a total characteristic from the camera head to the CCU.

However, when a vast amount of information such as a wide aspect video signal is digitally transmitted between the camera head and the CCU, the transmission speed becomes extremely high. For this reason, in combination with the distance, it is difficult to realize digital transmission with the conventionally used triax multi-cable.

[0004]

As described above, in the conventional television camera device, the camera head and the C
It was difficult to realize digital transmission between CUs.

The present invention has been made to solve the above problems, and an object thereof is to provide a television camera device capable of realizing digital transmission between a camera head and a CCU.

[0006]

In order to achieve the above object, the present invention provides a television camera device for digital transmission between a camera head and a camera control unit, wherein the camera head and the camera control are provided by an optical fiber. A camera cable connecting between the unit and a plurality of digital signals on the camera head side is time-division-multiplexed to be converted into an optical signal, which is sent to the camera control unit via an optical fiber of the camera cable for camera control. After converting an optical signal into an electric signal on the unit side, first optical transmission means for separating into a plurality of digital signals, and a plurality of digital signals on the camera control unit side are time-division-multiplexed and converted into an optical signal, Send it to the camera head through the optical fiber of the camera cable and A second optical transmission means for converting an optical signal into an electric signal on the terminal side and then separating it into a plurality of digital signals, wherein the time division multiplexing is performed asynchronously for low rate signals. Characterize.

[0007]

In the television camera device having the above structure,
The optical transmission method enables digital transmission. In particular, low rate signals can be transmitted asynchronously.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIG.

FIG. 1 shows the structure of a television camera apparatus according to the present invention. Reference numeral 11 is a camera head, 12 is a camera control unit (CCU), both of which are connected by an optical fiber cable 13.

In the camera head 11, the R-CCD 1
11R, G-CCD111G and B-CCD111B are charge transfer device image pickup devices for picking up images of respective colors of R (red), G (green) and B (blue) from an optical system (not shown). The video signal is subjected to amplitude adjustment and the like by analog processing circuits 112R, 112G and 112B, then converted into digital signals by A / D (analog / digital) converters 113R, 113G and 113B, and further digital processing circuits 114R and 11B.
Predetermined process control is performed by 4G and 114B, and P / S
It is sent to the (parallel / serial) converter 115.

The P / S converter 115 is supplied with a voice / command digital signal (bits having a lower rate than the digitally processed signal), and the P / S converter 115 receives the digital inputs of these four systems. Convert to serial format. The output of the P / S converter 115 is the encoder 116.
After conversion with (from 8B to 10B, 1.125Gbp
s), converted into an optical signal by the E / O (electrical / optical) converter 117, and the down line 131 of the optical fiber cable 13.
To the CCU 12 via.

In the CCU 12, the optical signal received from the down line 131 of the optical fiber cable 13 is O / E.
The photoelectric conversion is performed by the (optical / electrical) converter 121, and the decoder 1
Returned to the state before conversion at 22 (10B → 8B) S / P
It is sent to the (serial / parallel) converter 123.

The S / P converter 123 converts the input serial signal into a parallel signal to output R, G, B video outputs and audio / command outputs (lower rates than R, G, B video outputs). obtain. Of these, RGB video outputs are both sent to a D / A (digital / analog) converter 125, an encoder (ENC) 126, and a switch 129.

The D / A converter 125 receives the input RGB
The video signal is converted back to an analog signal and output. The encoder 126 converts an RGB video signal into a composite signal, and the composite signal obtained here is output in the D2 format by the D2 format generation circuit (D2) 127 and is also analogized by the D / A converter 128. It is converted into a signal and output.

The switch 129 selectively derives the RGB video signal and the composite signal output from the encoder 126, and the selected signal is the D / A converter 1.
The signal is converted into an analog signal by 2a, the amplitude is adjusted by the amplitude adjuster 12b, and the signal is supplied to a WFM (fave form monitor).

On the other hand, as information to be sent from the CCU 12 to the camera head 11, SYNC input, command / voice synchronization,
Return video input, prompt video input, INCO
There is M / PGS (low rate bits). Here, the unused system for expansion is included. SYNC input, prompt video input are command / voice synchronization, INCO respectively
The M / PGS is multiplexed and sent to the P / S converter 12c together with the return video input and the extended system signal.

The P / S converter 12c converts digital inputs of these four systems into a serial format. The output of the P / S converter 12c is encoded by the encoder 12d (converted to 1.125 Gbps by 8B → 10B), then converted to an optical signal by the E / O converter 12f, and the upstream line 132 of the optical fiber cable 13 is converted. Is sent to the camera head 11 via.

In the camera head 11, the optical signal taken in from the upstream line 132 of the optical fiber cable 13 is photoelectrically converted by the O / E (optical / electrical) converter 118 and returned to the state before encoding by the decoder 119 ( 10B →
8B) It is sent to the S / P (serial / parallel) converter 11a.

The S / P converter 11a converts an input serial signal into a parallel signal to obtain a SYNC output, a return video output, a prompt video output, and an extended system signal. From the SYNC output, command / voice synchronization,
INCOM / PGS is obtained, and the transmission from the CCU 12 to the camera head 11 is completed.

It is assumed that the inputs of the P / S converters 115 and 12c and the outputs of the S / P converters 123 and 11a are transmitted at a speed of 22.5 Mword / s in both systems.

That is, in the above structure, a large amount of information can be transmitted at high speed by adopting the optical transmission system as the transmission system. However, since the information to be transmitted does not have the same rate, it is originally necessary to perform time division multiplexing by P / S conversion after synchronizing all the information signals.

However, looking at the information transmitted from the camera head 11 to the CCU 12, for example, since the audio / command of a sufficiently low rate is multiplexed from the RGB video signals which are synchronized with each other, the audio / command is converted into RGB.
Time division multiplexing by P / S conversion is possible without synchronizing with the video signal. Therefore, low-rate signals are optically transmitted without being synchronized.

That is, in the past, a low-rate signal was synchronized with a video signal and compressed and placed on the BL (blanking period) of the video signal, but such a process is unnecessary in the above-mentioned configuration, and it is asynchronous. A low-rate signal can be transmitted as it is.

The above is the same in the optical transmission from the CCU 12 to the camera head 11, and the command / voice synchronization and INCOM / PGS that remain at a lower rate than SYNC input, return video input, and prompt video input remain asynchronous. Can be transmitted.

Therefore, the television camera device having the above-mentioned configuration can perform digital transmission by adopting the optical transmission system. In particular, low rate signals can be transmitted asynchronously. Further, since digital transmission is possible, it is not necessary to adjust the amplitudes of the RGB outputs after aspect conversion, and the WFM output system can be simplified.

The present invention is not limited to the above embodiment. For example, although different optical fibers are used for the downlink and the uplink in the above embodiment, the optical fibers can be shared by making the wavelength different between the downlink and the uplink. Other than the above, various modifications may be made without departing from the scope of the present invention.

[0027]

As described above, according to the present invention, it is possible to provide a television camera device capable of realizing digital transmission between the camera head and the CCU.

[Brief description of drawings]

FIG. 1 is a block circuit diagram showing a configuration of an embodiment of a television camera device according to the present invention.

[Explanation of symbols]

11 ... Camera head, 111R, 111G, 111B ...
CCD, 112R, 112G, 112B ... Analog processing circuit, 113R, 113G, 113B ... A / D converter,
114R, 114G, 114B ... Digital processing circuit, 1
15 ... P / S converter, 116 ... Compression circuit, 117 ... E /
O converter, 118 ... O / E converter, 119 ... Expansion circuit,
11a ... S / P converter, 12 ... Camera control unit (CCU), 121 ... O / E converter, 122 ... Expansion circuit, 123 ... S / P converter, 124R, 124G, 1
24B ... Aspect converter, 125 ... D / A converter, 1
26 ... Encoder, 127 ... Delay circuit, 128 ... D
/ A converter, 129 ... switching device, 12a ... D / A converter,
12b ... Phase adjuster, 13 ... Optical fiber cable, 13
1 ... Downlink, 132 ... Uplink.

Claims (2)

[Claims] 1. A television camera device for digital transmission between a camera head and a camera control unit, wherein a camera cable for connecting the camera head and the camera control unit by an optical fiber, and a camera cable on the camera head side. A plurality of digital signals are time-division-multiplexed and converted into an optical signal, sent to the camera control unit via the optical fiber of the camera cable, and the optical signal is converted into an electric signal on the camera control unit side, and then a plurality of digital signals are transmitted. A first optical transmission means for separating into signals, and a plurality of digital signals are time-division multiplexed on the camera control unit side to be converted into optical signals, which are sent to the camera head through an optical fiber of the camera cable, After converting the optical signal into an electrical signal on the head side, multiple digital A television camera device, comprising: a second optical transmission unit for separating the signal, wherein the time division multiplexing is performed asynchronously for a low rate signal. 2. The optical signal wavelength of the first optical transmission means and the optical signal wavelength of the second optical transmission means are made different, and the optical fiber of the camera cable is shared bidirectionally. The television camera device according to claim 1.