JPH03234190A - Still picture television telephone set - Google Patents

Abstract

PURPOSE:To observe a television telephone picture simultaneously while observing other video picture by providing a master/slave pattern changeover switch circuit and a picture-in-picture section so as to use existing monitor and camera for still picture television telephone set. CONSTITUTION:The telephone set is provided with a CPU 6, a picture control section 7, a picture memory section 8, a switch section 11, a switch circuit section 12 switching a master pattern and a slave pattern of picture-in-picture and a picture-in-picture section 13 or the like, a MODEM, a picture memory controller function, and a picture-in-picture function. Thus, an existing monitor camera is used to make the telephone set inexpensive and the picture-in-picture function is provided to observe a television telephone set picture is observed while observing a video software.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a still picture videophone.

(Prior Art) Fig. 2 is a block diagram of a conventional still picture videophone device shown on page 31 of the September 1988 issue of TV Technology, “Detailed explanation of TTO standard videophone.” (1
) is a line terminal for connecting to a public telephone line, (2) is an external terminal for connecting a telephone (not shown), and (2) is a telephone terminal for connecting a telephone.
3) is a network control unit that controls the interface between the public telephone line and the telephone, (4) is an image data modulation/demodulation unit, and (5) is a demodulation timing generation unit.

(6) is the central control unit (hereinafter referred to as cpa), (7)
is an image control unit, (8) is an image memory unit, (9) is a monitor for displaying images, (11 is a camera, and an is a switch unit.

Next, the operation of the still image videophone will be explained based on FIG. A public telephone line is connected to the line terminal (1), and an external telephone is connected to the telephone terminal (2).

1. For voice calls, the external connection is from the telephone to the telephone terminal (2) and the network control unit (3), then to the two-line terminal (1).
is sent to the other party via a public telephone line.

The voice signal from the other party is transmitted through a path opposite to the above path.

On the other hand, when the 9 image signal is sent to the switch unit ciD, the CPUf61 sends an image memory unit (8
) is read out via the image control unit (7), modulated by the modulation/demodulation unit (4), and transmitted to the other party via the network control unit (3) and the line terminal il+ via the public telephone line. be done.

The image signal is received by the image memory unit (
8), from which the image signal is sent to the monitor (91) and displayed.

When the transmission and reception of the image signal is completed, the network control section (3) connects the telephone terminal (2) and the line terminal +11 to return to the voice communication state.

Also, the image signal of the image captured by camera II is as follows.

The image is stored in the image memory section (8) via the image control section (7).

The data is sequentially sent to the monitor (9) and displayed.

[Problem to be solved by the invention]

Since the conventional still picture video telephone device is constructed as described above, there is a problem that the camera and monitor are integrated, making it expensive.

This invention was made to solve the above-mentioned problems, namely, a camera for videophones.

The purpose of the present invention is to obtain a still image videophone device that can use an existing monitor and simultaneously view a still image videophone image while viewing a video source.

[Means to solve the problem]

A still image videophone device according to the present invention includes a modem and an image memory controller, and further has a picture-in-picture function.

Consideration was given to using existing cameras and monitors.

[Effect]

The still image videophone of this invention uses an existing monitor camera, making the device inexpensive, and has a picture-in-picture function, allowing users to watch video software while watching video software.

You can view videophone images.

[Embodiments of the invention]

An embodiment of the present invention will be explained below with reference to the drawings. 1st
In the figure, (1) is a line terminal for connecting to a public telephone line, (2) is an external terminal (not shown) is a line terminal for connecting a telephone, and (3) is an interface between the public telephone line and the telephone. network control unit that controls the

(41 is the image data modulation/demodulation section, (5) is the demodulation timing creation section, (6) is the CPU, f71 is the image control section, (8
) is the image memory part, α9 is the switch part, α2 is the switch circuit part that switches between the picture-in-picture main screen and sub-screen, aiFi picture-in-picture part, α4 is the external connection (not shown) is the parent and child for connecting the monitor. The screen video output terminal α5 is a video input terminal for connecting a video device such as a VTR, and we is a video input terminal for connecting a videophone camera.

Next, the operation of the still picture videophone will be explained based on FIG. Connect the public telephone line to the line terminal (11), and connect the external telephone to the telephone terminal (2). After passing through the control unit (3), it is sent from the 0-line terminal (1) to the other party via the public telephone line.

The voice signal from the other party is transmitted through a path opposite to the above path.

On the other hand, for the 8-image signal, when the switch unit wholesaler is instructed to transmit multiple image data, cpσ (6) reads out the image data stored in the image memory unit (8) via the image control unit (7), and modulates and demodulates it. The signal is modulated in the section (4) and transmitted from the network control section (3) and the line terminal (1) to the other party via the public telephone line.

For display on an external monitor, transmitted images from a camera, etc. are input to the video input terminal αθ, or received images from a videophone are inputted to the parent/child screen switching circuit (12) via the image control unit (7), and then output to the VTR. etc. video input terminal (L
! Image signal from 9 and picture-in-picture part α
j is combined as a parent and child screen, and the external one is output to the video output terminal 0 to the monitor.

In the above embodiment, the picture-in-picture 0 function is provided after the image processing section, but it is also possible to provide this function before the image processing section.

In this case, video output from video equipment such as a VTR can also be transmitted as a still image via the telephone line.

Further, in this embodiment, a black-and-white still image videophone was described, but the present invention can be similarly applied to a color phone.

Furthermore, in order to reduce the cost of a separate still image videophone device, a configuration in which the picture-in-picture function is not included may be considered.

〔Effect of the invention〕

As described above, according to the present invention, since the configuration is such that an existing still image videophone camera and monitor are connected, the device can be made inexpensive, and the videophone image can be displayed simultaneously while viewing other video images. You can see it.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a still picture video telephone device according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional still picture video telephone device. In Figure 1, az is a picture-in-picture parent-child screen changeover switch circuit, α3 is a picture-in-picture part,
αhen is the parent-child screen output terminal, (19 is the input terminal for video equipment such as a VTR, especially a camera input terminal for videophones. In Figure 1, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] In still image videophones used via public telephone lines,
Use existing monitors and cameras, and use V on the monitor.
A still image videophone device characterized by having a picture-in-picture function that allows you to view 3 videophone images while watching a video such as TR.