JPH04129467A - Still picture television telephone set - Google Patents

Abstract

PURPOSE:To confirm who is a called party without lifting-up a handset by analyzing a password in a PB signal sent from an opposite party detected by a PB signal detection section and displaying a picture data stored in advance corresponding to the password onto a display device. CONSTITUTION:A central control section 13 uses its automatic call reception function to attain automatic call reception by detecting a call signal by a call signal detection section 22 and uses an analysis display function to analyze a password in a PB signal sent from an opposite party detected by a PB signal detection section 24. Whether or not the password is registered is discriminated and in the case of YES, the central control section 13 controls a picture control section 14 and displays a picture corresponding to the password stored in advance in a picture memory section 15 onto a CRT 19. Thus, from whom a telephone call comes without lifting up the handset.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a still image videophone device that transmits and receives still images using a telephone line.

[Prior Art] In recent years, a still image captured by a camera is modulated into an audio frequency signal, converted to image data, and this image data is sent to a telephone line to send the still image to the other party. A large number of still image videophone devices that can perform this function have been put into practical use.

FIG. 3 shows a system configuration diagram of a conventional still picture video telephone device shown in the September 1988 issue of Television Technology, for example, in which a still picture video telephone device (10) connected to a telephone line (1) is connected to a telephone line (1). connects the telephone (2) through the lead wire (4)
is connected, and during a call, the call is temporarily interrupted and the desired still image is sent and received. In addition, still image videophone equipment (
By connecting a recording device (3) to 10) via a lead wire (5), still images can be stored on a cassette tape.

FIG. 4 is a block diagram showing the configuration of the still image video telephone device (10). In FIG. 4, (11) is a network control section, and this network control section (11) The recording device (
3) via external device terminals (5a) and (5b), and performs call control and input/output control of image data to the telephone line (1) and the recording device (3).

(12) is a modem unit connected to the network control unit (11), (
13) is a central control unit connected to the modulation/demodulation unit (12);
14) is an image control unit connected to the central control unit (13);
(15) is an image memory section connected to the image control section (14), and (16) is an analog/digital (A/D) converter (
(17) is connected to the image control unit (14), (19) is a digital/analog (D/A) converter (1
8) is a CRT as a display connected to the image control unit (14), (20) is a power supply that supplies power to each of the above parts, and (21) is each operation button connected to the central control unit (13). be.

Next, the operation will be explained.

First, the user picks up the handset of the telephone (2) and dials. At this time, the network control unit (11)
transmits the dial signal input from the telephone terminal (4a) to the telephone line (1) via the line terminal (1a), connects to the other party's telephone line, and connects to the telephone line of the other party.
0) into a talking state. As a result, signals on the telephone line (1) are transmitted and received by the telephone (2) via the network control section (11).

On the other hand, the still image taken with the camera (16) is
/D converter (17) to the image control unit (14), and then the D/A converter (18) to the CRT (
19).

In this state, if you want to send the above-mentioned still image to the other party, press the transmission operation button (21a).
3), the central control unit (13) drives the image control unit (14) to convert the pixel data from the camera (16) read through the A/D converter (17) into an image. One field is stored in the memory section (15) as image data for transmission.

The central control unit (13) then sends a dual tone signal (DT) indicating the arrival of image data, a frame synchronization signal,
The image control information (C) such as the number of pixels is transmitted to the modulator/demodulator (1
2), one field's worth of transmission image data is sequentially read out for each pixel from the image memory section (15) via the image control section (14) and provided to the modulation/demodulation section (12).

On the other hand, the network control unit (11) controls the transmission operation button (2).
When 1a) is pressed, the telephone (2) is muted and the modem section (12) is connected to the telephone line terminals (1a) and (1b). The signal, frame synchronization signal, image control information and image data modulation signal are transmitted to the telephone line (1).

In this way, when the transmission of the image data is completed, the network control unit (11) switches the connection of the telephone line terminals (1a) and (1b) from the modulation/demodulation unit (12) to the telephone set (2), and returns to the talking state. do.

Next, a case will be described in which a still image is received from the other party.

The network control unit (11) transmits a dual tone signal (D
When detecting reception of T), mute the phone (2),
The modulation/demodulation section (12) is connected to the telephone line terminals (1a), (1b), and the signal from the telephone line (1) is transmitted to the modulation/demodulation section (
12).

As a result, the received signal received from the telephone line (1) is demodulated into image data by the modulation/demodulation unit (12), and the central control unit (
13), the image memory unit (1) via the image control unit (14)
5) and displayed on the CRT (19) via the D/A converter (18).

Then, after receiving the image data, the network control device (11) connects the telephone line (1) to the telephone (2) and switches to a talking state.

[Problems to be Solved by the Invention] Since the conventional still image videophone device is configured as described above, when a call is made, it is possible to temporarily interrupt the call and send and receive image data, but when a call is received, The problem is that unless you pick up the handset and talk to the other party, you cannot know who the caller is.

This invention was made to solve the above-mentioned conventional problems, and aims to provide a still image videophone device that allows you to confirm who is calling the incoming call without picking up the handset. purpose.

[Means for Solving the Problems] A still image videophone device according to the present invention includes a ringing signal detection unit that detects a ringing signal from a telephone line when a call is received, and a DC loop that forms a DC loop for automatically receiving a call. a forming unit, and a P which detects a PB double signal from the telephone line.
an automatic call reception function that automatically receives a call by controlling the direct current forming unit when the call signal detection unit detects a call signal; and an automatic call reception function that automatically receives a call when the call signal detection unit detects a call signal; The central control unit is equipped with an analysis display function for analyzing a personal identification number based on an incoming PB double signal and displaying pre-stored image data for that personal identification number on the display.

[Function] The central control unit in this invention automatically receives a call when the call signal detection unit detects a call signal using the automatic call reception function, and uses the analysis display function to detect the PB multiplier sent from the other party detected by the PB signal detection unit. By analyzing a signal-based PIN number and displaying pre-stored image data corresponding to that PIN number on a display, you can automatically identify the person on the other end of an incoming call without having to pick up the handset. I can do it.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. In FIG. 1, in which the same parts as in FIG.
22), a DC loop forming unit (23) for realizing automatic call reception, a PB signal detection unit (24) for detecting a PIN number using a PB double signal, and a PB signal detection unit (24) for automatically receiving a call and displaying an image based on the PIN number. Selector switch (25) to set whether
), a voice synthesis unit (26) for sending a message prompting the other party to enter a PIN number, and an off-hook detection unit for detecting the state of the hook switch of the telephone connected to the still image videophone device (10). (27).

The operation of the above embodiment will be explained below with reference to the flowchart shown in FIG. First, after initialization processing is performed in step ST1, the changeover switch (25
) is enabled (on). If this judgment is No, that is, the changeover switch (25) is disabled (off)
is set, in step ST'3, the fourth
The call operation is the same as that of the conventional still image videophone device (10) shown in the figure.

On the other hand, when the determination in step ST2 is YES, that is, when the changeover switch (25) is set to ON, the operation at the time of automatic call reception is as follows.

When a call is received when the changeover switch (25) is turned on to automatically receive a call, the call signal detection unit (
22) determines whether a calling signal is detected from the telephone line 1, and if No, returns to step ST2 and repeats the above operation. If YES, the automatic call reception is notified to the central control unit (13) in step ST5.

The central control unit (13) controls the DC loop forming unit (23) to form a DC loop and connect the telephone. After this, the central control section (13) controls the speech synthesis section (26).
), and in step ST6 sends a message prompting the other party to input a PIN number.

Next, in step ST7, it is determined whether or not the other party has sent a PB signal of a series of PIN numbers, and if No, it is determined in step ST8 whether or not a timeout has occurred, and if No, step ST7 is performed. If the answer is YES, the process returns to step ST2.

Then, if the determination in step ST7 is YES, the PB
The central control unit (13) is notified of the detection by the double signal PB signal detection unit (24), and in step ST9 it is determined whether the PIN number is registered. If NO, return to step ST2 and select YES. In this case, the central control unit (13) controls the image control unit (14), and the image memory unit (15)
Display the image corresponding to the PIN number stored in advance on the CRT
(19) (step 5TIO). As a result,
You can see who is calling you without picking up the handset.

After the image is displayed on the CRT (19), step 5T1
1, it is determined whether the /\ end set of the telephone connected by cable to the still image video telephone device (10) has been picked up, and if No, it is determined whether or not a timeout has occurred in step STI 2; is step 5TI
Return to I, if YES, that is, absent or CRT
The central processing unit (13) controls the voice synthesis unit (26) if the handset of the telephone is not picked up within a certain period of time because the call is from a person who does not need to answer based on the display content in (19). After sending a message to the other party saying that the call cannot be answered (step 5T13), the direct current loop forming section (2B) is controlled to disconnect the telephone line 1 and hang up the call (step 5T14).

On the other hand, if the determination in step 5TII is YES, that is, when the off-hook detection section (27) detects off-hook and notifies the central control section (13), the handset becomes ready for talking (step 5T15).

Note that in the above embodiment, after forming a DC loop and establishing a call state, the voice synthesizer (26) is controlled to send a message prompting the other party to enter the PIN number; It is possible to eliminate the need to send the above-mentioned message by sending the PIN number to the user.

[Effects of the Invention] As described above, according to the present invention, the call signal detection unit automatically receives a call by detecting the call signal, and the PB
The signal detection unit analyzes the PIN code sent from the PB double signal sent from the other party and displays the pre-stored image data corresponding to that PIN number on the display. You can confirm who is calling without picking up the handset, and you can definitely avoid picking up the handset to answer unnecessary calls for which you do not have a password memorized, such as mistaken calls, advertisements, etc. A novel effect can be obtained.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a still picture video telephone device according to an embodiment of the present invention, FIG. 2 is a flow chart explaining the operation of this still picture video telephone device, and FIG. 3 is a block diagram showing a still picture video telephone device according to an embodiment of the present invention. System configuration diagram FIG. 4 is a block diagram of a conventional still picture video telephone device. (1) is a telephone line, (2) is a telephone set, (10) is a still image video telephone device, (11) is a network control unit, (12) is a modulation/demodulation unit, (13) is a central control unit, and (14) is a image control unit,
(15) is the image memory section, (16) is the camera, (19)
is a CRT, (22) is a call signal detection section, (23) is a DC loop formation section, (24) is a PB signal detection section, (27)
) is an off-hook detection section. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Agent Patent Attorney Yoshi 1) Kenji (2 others) My duty will be in August! The movement of fPFk-kun 9-FJFI 70-Chart diagram Conventional a special image North ゛ To the system structure of electrical connection' Figure

Claims (1)

[Scope of Claims] A network control unit that connects a telephone set or a modulation/demodulation unit to a telephone line, and a network control unit that stores image data input from a camera or image data input from the telephone line in an image memory unit and displays it on a CRT. A still image videophone device having a central control unit that controls an image control unit, comprising: a ring signal detection unit that detects a ring signal from the telephone line; and a DC loop formation unit that forms a DC loop for automatic call reception. and a PB signal detection unit that detects a PB signal from the telephone line, and an automatic call reception function that automatically receives a call by controlling the DC loop forming unit when the call signal detection unit detects a call signal. and an analysis display function that analyzes a PIN number based on a PB signal sent from the other party detected by the PB signal detection unit and displays pre-stored image data corresponding to the PIN number on the display. A still image videophone device characterized in that a central control unit is provided with the device.