JPS5850879A - Television telephone set - Google Patents

Abstract

PURPOSE:To prevent a mischievous call, etc., by displaying an image of a calling subscriber on the picture tube of a called-subscriber side while the telephone is ringing. CONSTITUTION:When the telephone set of a called-subscriber side rings, a call signal is detected by a pickup coil PL1 to energize a relay Y-1, placing an image pickup tube AI-1 in operation. An image of the calling subscriber is picked up through the image pickup tube AI-1, whose signal is sent to the picture tube CR- 2 of the called-subscriber side to form the image thereupon. Thus, the called subscriber confirms the face of the calling subscriber on the picture tube CR-2 while the telephone is ringing.

Description

DETAILED DESCRIPTION OF THE INVENTION The applicant previously discovered the inconsistencies in the current telephone system through Japanese Patent Application No. 50-49423. This proposed a means to eliminate telephone pollution such as prank calls and threatening calls by making it possible to display information on a display device. Furthermore, patent application 1977-160
No. 120 proposed a measure to deal with the international spread of this device, and when making a call from a public phone, the calling number should be displayed with a U character in front of it. He proposed such a method. However, no matter how much the calling party number is displayed, there are cases where the caller cannot be remembered. In such cases, it is desirable that the caller's face be displayed on the telephone. Furthermore, if the phone number is displayed, it should be completed. Therefore, the applicant has filed this application based on the above social needs.

That is, the first object of the present application is to operate the imaging tube (such as a television camera) on the calling party's side by the ringback tone that is sent back to the calling party when a paging signal is received;
The image reaches the called party via a video line and a video exchange, and is displayed on the picture tube of the called party while the telephone bell is ringing.

The structure and operation of the embodiment of the present application will be explained below.

The figure shows an example of the circuit configuration of a videophone using a four-wire communication network. That is, each television telephone terminal device is composed of an image pickup tube, a picture tube, and a telephone set, and device-1 in the figure is a push-button telephone, and VIO-1 is a display device.
-1 is an image pickup tube, and CR-1 is a picture tube.

Assume that the same device is also present at the called party. Among them, the push-button dial telephone device-1 is connected to the voice exchange LS-1 by the voice circuit ℃1, and the VIO-1 is connected to the video exchange 5BLS by the video transmission line 12 and reception line p3.
Enter -1.

Normally, this type of exchange has a common control unit, which simultaneously sends a dial tone to station-1 and VIO-1.
1 video line f11, 112 is captured. So, make a call/
When the subscriber finishes dialing, the common control device checks the voice tandem switch or the accompanying video tandem switch, and after confirming that it is available, sends a control signal to the voice switch LS-2 for the called subscriber. The common control unit of the called party's exchange is then transmitted to the voice exchange LS.
-2 and the video switch 5BLS-2 to send a paging signal to the called party's location-2. It is an object of the present application to enable the called party to ascertain the identity of the calling party while listening to the ringing signal and before taking the handset off-hook as described above. will be discussed below.

That is, when the ringing signal rings on the telephone of the called party, the LS-2
It is already known that the caller sends a so-called ringback tone back to the LS-1, and that the ringback tone can be heard by the caller who holds the handset of the telephone device 71 to his ear. To simplify the explanation, it is assumed that the ringing signal is generated by the ringing of the bell inside the telephone, and the pickup coil PI, 1 is located close to this, and the ringing signal is detected by this PLt. -1 is activated, and the contacts of the relay supply power, etc., and put Al-1 in an operating state. Note that instead of the pickup coil, a circuit that is directly connected to the telephone line and operates only by the ringback tone of the telephone may be used. Since the ringback tone is weaker than the calling signal, it is safer to obtain it directly from the telephone line. Therefore, the image pickup tube is positioned so that the face of the caller holding the handset is reflected on the called party's phone, so the video signal that captures the image of the caller is A.
From l-1, pass through 5BLS-1 and reach 5BLS-2,
The image is connected to the picture tube C)'L-2 on the called party's side via the picture receiving line na. Therefore, the called party can confirm the other party's face through the picture tube CR-2 while the doorbell is ringing. It should be noted that it is considered normal for a sophisticated device like the one in the present application to be attached with a caller's number display device as described in the earlier application, so this number is also displayed on the called party's side at the same time. It will be displayed on the device. Note that this display device may use a television picture tube, but the image reflected on a television picture tube is usually not very precise, and displaying a telephone number, etc. at the same time on a picture tube in a small space may actually reduce the clarity. is often lacking. Therefore, as mentioned in the above reference, it would be more practical to install a display device exclusively for number display in a part of the telephone set, which would actually improve clarity. Therefore, the called party can know both the face and telephone number of the caller in advance while the doorbell is ringing, and thereby confirms the other party before picking up the handset.

Normally in videophone calls, when the handset is picked up, the called person's image is captured by the image pickup tube Al-2, and this image is received by the caller's picture tube, thus establishing an exchange connection between the two sides. .

After that, both parties can have a voice conversation while looking at each other's facial expressions. Normally, in a videophone call, when one of the two parties goes off-hook, the power to the picture tube is turned off, and the system returns to the next standby state. This point is similar in the present application, and when either of the two parties goes off-hook, the telephone line is restored, the video equipment is restored, and the system waits for the next standby state.

As described above, when the calling party dials the called party in a videophone call, the called party can see the face and telephone number of the calling party while the doorbell rings. This allows you to decide whether to answer the phone or leave it to answering machine, etc.
This has an unprecedented and groundbreaking effect in preventing so-called telephone pollution such as prank calls and threatening calls, and also in daily business, and the applicant intends to obtain a patent within the above scope. It is something to be charged.

Note that the method and structure may be changed without departing from the spirit of the invention of the present application.

[Brief explanation of the drawing]

The figure is a diagram showing the principle of the present invention. applicant . Hashimoto Corporation Co., Ltd. Representative Kazuhide Hashimoto

Claims (1)

[Claims] (1) The calling party takes off-hook the handset of the telephone and dials the telephone number of the other party (called party), and the called party's telephone station receives the dialing information and sends a ringing signal to the called party's telephone. When calling, a switching device that operates by detecting the ringback tone of the calling signal sent back to the calling party's telephone operates the image pickup tube, and the imaged video signal of the calling party is sent to the calling party's telephone station via the video line. The called party's telephone office transmits the video signal to the video line (on the called party's side) when the calling signal is sent, and when the calling signal first arrives, A video telephone device characterized in that an image of the calling party is projected onto a called party's receiver which is in an operating state.