JPH01243681A - Telephone network communication equipment - Google Patents

Abstract

PURPOSE:To image-pickup a picture desired to transmit such as a character or graphic information, etc., in a direction just as it is written, and to transmit it in the correct direction just as it is written to a cathode-ray tube of not only a transmitting side but a remote party side by switching electrically the scanning direction of a camera. CONSTITUTION:If the angle of the camera 1 is as shown by a full line in a figure, as being connected with it, a vertical switching relay 12 and a horizontal switching relay 13 are laid down by a switch driving means 14 so that the vertical and the horizontal scanning directions of the camera 1 are reversed. Accordingly, as for the pictures displayed on the cathode-ray tube 11 and the remote party side and displayed as well, 'I', 'RO', 'HA' (Japanese syllabary) which is written on scratch paper and of the correct direction reverse in all directions can be reproduced. Thus, by providing a means to switching the scanning direction of the camera in both a horizontal and a vertical directions in addition to a mechanism to change the camera angle, the character or the graphic information written on the scratch paper can be reproduced on the cathode-ray tubes of the transmitting side and the remote party side in the correct direction just as it is written on the scratch paper in addition to the picture information of mainly a sender in the past.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a terminal device in the field of telephone network communications.

BACKGROUND OF THE INVENTION In recent years, telephone network communication has been widely used for not only voice but also text and image transmission since telephone lines were released. In particular, so-called videophones, which use a combination of a telephone and a display device such as a cathode ray tube to transmit the face of the person on the other end of the phone, have been attracting attention recently.

An example of the conventional videophone mentioned above will be described below with reference to the drawings.

An example of a conventional videophone will be explained with reference to FIG. In FIG. 2, numeral 1 is a camera for taking images to be transmitted to the other party on the phone.

2 is an A/D converter for quantizing the image captured by the camera 1; 3 is a memory for storing the A/D converted signal of the A10 converter 2; 4 is a D/A converter for converting the output of the memory 3 into an analog signal.

The purpose of the functions from the camera 1 to the O/A converter 4 is to perform band conversion for transmitting images over a general telephone line. That is, the image output from the camera 1 has a band of several MHz, but the band of a general telephone line is 3.4 Hz, and images cannot be transmitted as is. Therefore, in order to make this possible, the image signal is
After D conversion, the image data is stored in a memory 3 and taken out from the memory 3 at a slow time so as to be transmitted over a general telephone line 7. For example, image data is A/D
When converting, the image is 100 dots horizontally and 1 dot vertically.
Assuming that it is composed of 60 dots and the luminance component of one dot is represented by one bit, a memory capacity of 64 bits is required. The memory output becomes 8000 bits/second when one dot is taken out every 015 msec. This memory 3
When the output of is D/A converted, the maximum frequency of this output is
Since one dot takes 0.5 seconds, it becomes 1 Hz. This signal is A
The amplitude is modulated by the M modulator 5. It is possible to set the carrier frequency of the AM modulator 5 to, for example, 2 Hz, which is within the frequency band of a general telephone line, and modulate the D/A conversion output at a maximum frequency of 1 Hz. The output amplitude modulated by the AM modulator 5 is transmitted to the other party via the switching relay 8 and the telephone line 7. After transmitting the image, the switching relay 8 is moved to the telephone 6 side, and the user can talk to the other party normally. Incidentally, the vertical deflection circuit 9 and the horizontal deflection circuit 10 are drive units that cause the camera 1 to scan horizontally and vertically, respectively.

Furthermore, the other party processes the transmitted image in the opposite manner to the above-described processing and reproduces the transmitted image on a cathode ray tube, so a detailed explanation will be omitted.

FIG. 3 shows a conceptual diagram of a videophone. In FIG. 3, an image captured by a camera 1 is transmitted through a telephone line, and the image can be displayed on a cathode ray tube 11 of the other party's videophone.

Problems to be Solved by the Invention As is clear from the above description of the prior art, the conventional configuration has a problem in that it is only possible to capture and transmit only the true image to the videophone using the camera 1.

In view of the above problems, the present invention makes it possible to transmit images, especially characters and figures, to the other party in the normal direction.
This provides a videophone that allows you to talk with images.

Means for Solving the Problems In order to solve the above problems, the present invention includes a mechanism for changing the angle of the camera, and an A/D converter for quantizing the video signal captured by the camera, and the A/D converter quantizes the video signal captured by the camera. Add the output of the D converter to the memory, convert the output of the memory to D/A,
An AM modulator is used to perform amplitude modulation within the band frequency of the telephone line for transmission, and the polarity of horizontal and vertical scanning of the camera can be switched in conjunction with or independently of the camera angle variable mechanism. It is configured as follows.

Effects of the present invention With the above-described configuration, by electrically switching the scanning direction of the camera, images can be captured in the direction in which the image to be transmitted, such as text or graphic information, is written, and can be transmitted not only to the sender but also to the other party. can be transmitted in the correct direction as written on the cathode ray tube.

Embodiment Hereinafter, a telephone network communication device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of the invention.

In FIG. 1, parts with the same numbers as those in FIG. 2 indicate the same functions, and a description thereof will be omitted.

In FIG. 1, 12 is a vertical switching relay, 13 is a horizontal switching relay, and 14 is switching driving means for both relays 12 and 13.

The telephone network communication device configured as above for transmitting images and sounds will be explained below with reference to FIG. 4 and FIG. 1. In the conventional technology shown in FIG. 4, the camera 1 only takes the angle indicated by the broken line in the drawing, and mainly transmits only the image of the caller located in front of the camera 1. However, in this configuration, the camera 1 By providing a mechanism that can change the angle between the broken line position and the solid line position (front direction and downward direction), it is possible to easily write notes such as letters and figures on the transmission surface 15, which was not possible before. Moreover, with the conventional technology, as shown on the cathode ray tube 11 in FIG. In this configuration, when the angle of the camera 1 in FIG. 4 is on the solid line, the switching drive means 14 moves the vertical switching relay 12 and the horizontal switching relay 13 in FIG. 1 downward. The vertical and horizontal scanning directions of camera 1 are respectively reversed. As a result, the image transmitted and displayed on the cathode ray tube 11 in FIG.

In the above embodiment, the camera body is rotated as a mechanism for changing the angle of the camera 1, but a mirror may be used in front of the camera to change the angle. Furthermore, although the horizontal switching relay 13 and the vertical relay 12 shown in FIG. 1 are switched in conjunction with each other depending on the camera angle, they may be switched manually instead of in conjunction with each other.

Effects of the Invention As described above, according to the present invention, in addition to the mechanism for changing the camera angle, a means for switching the scanning direction of the camera both horizontally and vertically is provided, thereby making it possible to easily change the angle in one direction. In addition to transmitting the image of the caller, which has been used up until now, the scanning direction switching means can also transmit text and graphic information written in memos in the correct direction on the CRTs of the caller and the other party. It has the effect of being able to reproduce.

[Brief explanation of the drawing]

FIG. 1 is an image of an embodiment of the present invention, a block diagram of a voice transmission telephone network communication terminal device, FIG. 2 is a conventional image, a block diagram of a voice transmission telephone network communication terminal device, and FIGS. 3 and 4. 1 is a perspective view and a schematic front view showing the concept of an image transmission telephone network communication terminal. 1... Camera, 2... A10 converter,
3... River memory, 4... D/A converter, 5...
...AM modulator, 6...Telephone, 7...
...Telephone line, 12...Vertical switching relay,
13...Horizontal switching relay, 14...River/switching drive means.

Claims (1)

[Claims] an A/D converter for quantizing the output signal of the camera;
a memory for storing the output of the A/D converter; a D/A converter for D/A converting the output signal of the memory;
An amplitude modulator for amplitude modulating the output signal of the D/A converter within the band frequency of the telephone communication line, mechanical means for changing the angle of the camera, and means for switching the scanning direction of the camera are provided. , a telephone network communication device characterized in that the output of the amplitude modulator and the audio signal are transmitted through a telephone network.