JPH0683446B2 - Telewriter for electronic conference - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a telewriter for electronic conferencing, and in particular, it is configured as a system using an auto-scan display device, and its presentation screen is required for explanation. The present invention relates to a telewriter for electronic conference that adds a pointer or underline.

[Conventional technology]

Conventionally, this type of teleconferencing telewriter has a scanning frequency of 15.75 KHz horizontal (hereinafter referred to as HD) and 60 Hz vertical (hereinafter referred to as VD) and has a pointer and The one having one scanning frequency for superimposing data such as underline is generally used.

[Problems to be solved by the invention]

As described above, the conventional teleconference telewriter has only one scanning frequency (HD 15.75KHz, VD 60Hz), but when an input device with a different scanning frequency such as today's electronic conferencing system becomes popular, The display itself can be supported by the advent of an auto scan motor, etc., but additional display such as specific position display and underlining on each display screen, which is necessary as an auxiliary means for explanation, cannot be added because the scanning frequency is different. There is a drawback that.

[Means for solving problems]

The teleconferencing telewriter of the present invention has an input unit for inputting a point and position designation data for explaining a specific one on the display screen, an input interface unit for interfacing with the input unit, and a writing / reading function. A 1-bit RGB frame memory, a clock unit for changing the read timing of the data of the frame memory by a video signal and a switching instruction signal from a plurality of video input devices having different scanning frequencies, and the clock unit. Signal superimposing section for superimposing the data read from the frame memory on the respective video signals at a timing synchronized with the respective video signals by a read clock from the section, and the respective scanning frequencies output from the signal superimposing section. This monitor and the monitor display section that can display different output video signals An output interface unit for outputting an instruction signal instructing the signal state of the terpolymer display unit, the based on the data from the input interface unit outputs the switching instruction signal and said frame memory,
It is configured to include a main control unit that controls the clock unit, the signal superimposing unit, and the output interface unit.

〔Example〕

 The present invention will now be described in detail with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention, in which a point position input unit 1, an input interface unit 2, a main control unit 3, a frame memory unit 4, a clock unit 5, a signal superposing unit 6, and an output interface unit 7 are provided. And a monitor display unit 8 and the like.

The point position input unit 1 is an input unit for point position designation data using a tablet or the like, and the input interface unit 2 interfaces with the input interface unit 2 and requires the input unit 1 and the main control unit 3. Send and receive data.

Based on the data received from the point position input unit 1 via the input interface unit 2, the main control unit 3 should instruct switching of any one of external image input signals X ₁ , X ₂ , X _{3 and the} like described later. Is designated for the clock unit 5, the signal superimposing unit 6, and the output interface unit 7.

In addition, the main control unit 3 is based on the point position designation data provided from the point position input unit 1, and is an RGB 1-bit frame memory for each RGB color signal, which is an input data to the frame memory unit 4 having a write / read function. Write the on / off state corresponding to. In this case, the write clock supplied from the clock unit 5 to the frame memory unit 4 is constant, but the read clock provided from the clock unit 5 for reading the point position data from the frame memory unit 4 is the external video input signal. The timing pulse synchronized with the scanning frequency selected by the scanning frequency and the switching instruction signal of the external image input signal supplied from the main control unit 3 to the clock unit 5 is used.

External video input signals X ₁ , X ₂ , and X ₃ are supplied to the clock unit 5 and the signal superimposing unit 6, and these are, for example, X ₁
The output signal of the NTSC signal, such as a document camera apparatus (HD15.75KHz), X ₂ is an electron OHP (Over Head Projector) (HD 24.8KH
z) and X ₃ are output signals from a terminal video device or the like having a different HD frequency than X ₁ and X ₂ , and the clock unit 5 has a different HD based on the external video input signal and the switching instruction signal. It is supplied to the frame memory unit 4 while determining one of the read clocks of the point position data to be given in synchronization with each of the external image input signals of the frequency.

The signal superimposing section 6 is the same as the clock section 5,
With X _{1 to} X ₃ and the switching instruction signal received from the main control unit 3,
A designated one system of video input signal is selected, and the signal is superposed on the point position data read from the frame memory unit 4 at the timing synchronized with the scanning frequency of the video input signal, while the other video input signals are superposed. The output interface unit 7 outputs the output Y ₁ , Y ₂ and Y ₃ to the outside and the monitor display unit 8 without outputting the video input signal switching instruction signal from the main control unit 3 to the outside. The monitor display unit 8 outputs the output Y ₁ from the signal superimposing unit 6,
The signal on which the signals are superimposed is selected and displayed by Y ₂ , Y ₃ and the switching instruction signal from the output interface unit 7. The monitor display unit 8 used at this time is of an automatic scanning frequency following type (auto scanning type).

〔The invention's effect〕

INDUSTRIAL APPLICABILITY As described above, according to the present invention, a plurality of video input devices having different scanning frequencies are synchronized with each scanning frequency, and a tablet input is performed for each video signal from the plurality of video input devices. By superimposing the point position data signal from the input section such as format,
There is an effect that it is possible to specify the position of an explanation point as an auxiliary means for explaining the posted screen by each video signal displayed on the monitor display section, and additionally specify and display an underline.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention. 1 ... Point position input section, 2 ... Input interface section, 3 ... Main control section, 4 ... Frame memory section, 5 ...
Clock part, 6 ... Signal superimposing part, 7 ... Output interface part, 8 ... Monitor display part.

Claims (1)

[Claims] 1. An input unit for inputting a point and position designation data for explaining a specific one on a display screen, an input interface unit for interfacing with the input unit, and an RGB 1-bit each having a writing / reading function. A frame memory, a clock unit for changing the read timing of the data of the frame memory according to each video signal and a switching instruction signal from a plurality of video input devices having different scanning frequencies, and a read clock from this clock unit The signal superimposing section for superimposing the data read from the frame memory on the respective video signals at a timing synchronized with the respective video signals, and the output video signals having different scanning frequencies output from the signal superimposing section. To the monitor display section that can display An output interface section for outputting an instruction signal for instructing a signal state, and for outputting the switching instruction signal based on the data from the input interface section and for the frame memory, the clock section, the signal superposing section and the output interface section. And a main control unit for controlling, and includes a pointer and an underline for explanation with respect to each of the display screens displayed on the monitor display unit by the video signals having different scanning frequencies. A teleconference telewriter characterized by adding a point position display.