JPH06253300A - Video telephone set - Google Patents

Abstract

PURPOSE:To share the video telephone set with other system and to improve the operation convenience by adding an identification signal representing the video phone, sending the resulting signal, and allowing a receiver side to make adjustment to coincide with the same correspondent communication condition. CONSTITUTION:An identification representing data transmission from a video telephone set and distinguished from a FAX standard is set on picture data and voice data to be sent. A network control unit NCU 39 provided to a MO DEM uses a calling tone and a called station identification tone other than the specification of a FAX 3 and a data MODEM according to a communication mode switching processing of an equipment CPU to identify the other terminal equipment party in the call setup phase and coincide with the same communication condition as that of the other terminal equipment party and uses a relay 46 to switch the connection. Thus, the processing by the call setup mode before the talking mode is attained and the other terminal equipment party is specified in a short period of time and an own equipment is used for the same communication condition as the other terminal equipment party and the operation convenience is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a videophone device, and more particularly, to a communication system (calling only, facsimile only) that is connected in combination with a telephone with an answering machine or a facsimile device to receive a call. Device, a videophone device) and a videophone device capable of performing communication under the same conditions as a partner terminal by selecting them without making the user aware.

[0002]

2. Description of the Related Art Videophone devices have become popular because they have the merit of being able to show and convey information that is difficult to convey to the other party only by explaining with voice, and the advantage of being able to talk while watching the facial expression of the other party. Promising. Video telephone devices are roughly classified according to the type of communication network to be connected and the type of image and voice transmission function. For example, a device connected to an analog public line to transmit a monochrome still image or a color still image, or a color moving image. There are things such as transmitting an image.

A videophone device connected to such an analog communication network has a communication function of transmitting and receiving multiplexed image information and audio information, and communication corresponding to the connected communication network. Regarding the procedure and the encoding method of the image information and the voice information which are transmitted / received in addition to the communication signal based on the communication procedure, according to CCITT (International Telegraph and Telephone Consultative Committee) recommendation etc., It is prescribed.

For example, the procedure for document facsimile transmission in the general telephone exchange network is described in CCITT Recommendation T.264. No. 30, and this recommendation T.30. An example of the line adjustment signal according to 30 is shown in FIG.

FIG. 6 is a diagram showing a facsimile device identification tone. FIG. 4 (a) shows a calling tone of a calling side facsimile device, and FIG. 4 (b) shows a called side identification of a called side facsimile device. Shows the tone.

The facsimile device identification tone shown in FIG. 6 identifies the automatic facsimile transmission from the other party, the manual facsimile telephone and the telephone device, and the automatic reception when the other party is the automatic facsimile transmission, and the manual facsimile telephone and the telephone device. In the case of, it is an identification signal that enables the other party's message to be immediately picked up. For example, as shown in FIG. 6A, the calling side facsimile device repeatedly outputs a calling tone signal that outputs a signal of 1100 Hz for 0.5 seconds and rests for 3 seconds three times. In addition, the called facsimile machine outputs a signal of 2100 Hz for 2.6 to 4 seconds as shown in FIG.
It outputs a called identification tone that repeats a 20 ms rest.
As a result, the facsimile machine is connected to the facsimile machine or the telephone machine of the other party in 4 seconds.

[0007]

However, in such a conventional videophone device, when the videophone device is connected together with the facsimile device or the telephone with the answering machine, the identification method is not sufficient. Therefore, there is a problem in that it takes time to sort the communication, and the line usage fee is increased accordingly, and the usability is poor.

For example, as shown in FIG. 6, a method for identifying a communication partner coming from an unspecified partner when the videophone unit is used together with a facsimile unit and a telephone (especially, a telephone with an answering machine) is connected. CCITT Recommendation T.
Since it only used the timeout time of 4.5 seconds ± 15% stipulated in 30, it takes several seconds to distribute the communication from the other party and there is a problem that it can not be connected immediately, There was a drawback that the other party would be charged for the charge for a few seconds. That is, CCITT Recommendation T. In No. 30, since the transmission procedure of the facsimile device is only specified, the facsimile device and the other telephone devices, etc. can be distinguished, but the videophone device and the telephone device with answering machine within 4 seconds. It was not possible to identify it, and during this time it was supposed to continue to be charged.

Therefore, according to the present invention, the telephone can be used in combination with a telephone with an answering machine or a facsimile machine, and a communication system coming from an unspecified partner can be selected and communicated under the same conditions as the partner terminal without the user being aware of the communication system. It is intended to provide a possible videophone device.

[0010]

The invention according to claim 1 is
To achieve the above object, a data modulation / demodulation unit that modulates or demodulates image data and audio data and simultaneously transmits the image data and audio data via a communication line, and a display unit that displays predetermined image data are provided. In the videophone device described above, the data modulation / demodulation means, when making a call,
A means for transmitting an identification signal indicating data transmission from the videophone device is provided.

According to a second aspect of the present invention, data modulation / demodulation means for modulating or demodulating image data and audio data and simultaneously transmitting the image data and audio data via a communication line, and a display for displaying predetermined image data. And a means for transmitting an identification signal indicating that the receiving terminal is the video telephone device when the predetermined identification signal is received. ing.

According to a third aspect of the present invention, data modulation / demodulation means for modulating or demodulating image data and audio data, and simultaneously transmitting the image data and audio data via a communication line, and a display for displaying predetermined image data. In the videophone apparatus including the means, the data modulation / demodulation means adds an identification signal indicating that the data is transmitted from the videophone apparatus before transmitting the image data and the audio data through the communication line. Then, when receiving the transmitted image data and audio data, the other terminal is identified by the identification signal sent prior to the transmitted data.

According to a fourth aspect of the present invention, data modulation / demodulation means for modulating or demodulating image data and audio data and simultaneously transmitting the image data and audio data via a communication line, and a display for displaying predetermined image data. In the videophone apparatus including the means, the data modulation / demodulation means adds an identification signal indicating that the data is transmitted from the videophone apparatus before transmitting the image data and the audio data through the communication line. When receiving the transmitted image data and audio data, the other terminal is identified by the identification signal sent prior to the transmitted data and the same communication condition as the identified other terminal is set. I am trying.

The communication line may be, for example, an analog public line as described in claim 5, and the data modulation / demodulation means may make an outgoing call as described in claim 6, for example. A plurality of frequencies may be used as tones and called station identification tones to identify the partner terminal in the call setup phase and match the same communication conditions as the identified partner terminal. The identification signal may be an identification signal distinguishable from a communication standard defined by a facsimile machine or a data modem, for example, as described in claim 7, and the identification signal may be, for example, in claim 8. As described, one cycle of the output period and the rest period of the predetermined frequency signal may be 3.5 seconds or less, and the data modulation / demodulation means may be, for example, as described in claim 9. It may have an input / output terminal connected to an analog public line and an input / output terminal connected to a terminal including a facsimile device or a telephone device, and may be provided between the analog public line and the terminal. .

[0015]

(Functions) Claims 1, 2, 3, 4, 5, 6, 7, 8 and 9
In the invention described above, first, an identification signal indicating that the image data and audio data to be transmitted is data transmission from the videophone device is added, and the image data and audio data to which the identification signal is added are data-modulated and demodulated. It is simultaneously transmitted by means of a communication line.

Then, when receiving the transmitted image data and audio data, the other terminal is identified by the identification signal added to the transmitted data, and the same communication condition as the identified other terminal is adjusted. Adjusted to.

Therefore, it is possible to connect with a telephone with an answering machine or a facsimile machine in combination, and to select a communication system from an unspecified partner without making the user aware of it and communicate with the partner terminal under the same conditions. Become.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

1 to 5 are views showing an embodiment of a video telephone device according to the present invention.

First, the structure will be described. FIG. 1 is a diagram showing a connection state of a videophone device connected to a public telephone line, and a case where an analog telephone general subscriber line is used as a communication line will be described.

In FIG. 1, a videophone device 1 is connected to a public telephone line 2, and the facsimile device 3 or the telephone device is connected to the videophone device 1 via a predetermined connection terminal provided in the videophone device 1. 4 is connected. For example, the videophone device 1 is provided with an input / output terminal for connecting a communication line, and the input / output terminal is connected to the input / output terminal modular jack type outlet or a facsimile device by a modular cable having a modular plug. .

FIG. 2 is a block diagram showing a schematic configuration of the videophone device 1. In FIG. 2, the videophone device 1 includes a key input unit 11, a control unit 12, a camera unit 13, an image processing unit 14, a liquid crystal display unit 15, a sound processing unit 16, and a modulation / demodulation unit 17, and the key input unit 11, control unit 12, image processing unit 14, audio processing unit 16, modulation / demodulation unit 17
Are connected to the bus 18. Further, the modem unit 17 is connected to the telephone line 2, the facsimile apparatus 3 or the telephone apparatus 4, and the handset 19 via a predetermined connection terminal provided in the video telephone apparatus 1. The handset 19 is a handset in which a handset, a handset, and the like are connected by a grip and integrated.

The key input section 11 is composed of a plurality of key switches, and is used by the operator for instructing the selection of various processes in the video telephone apparatus 1.

The control unit 12 is a CPU (Central Processi).
ng Unit) 21, ROM (Read Only Memory) 22, RA
It is composed of an M (Random Ac-cess Memory) 23. The CPU 21 outputs various control signals for controlling each unit in the videophone device 1 to each unit via the bus 18, and executes a communication control program according to the type of communication line to be connected. The CPU 21 receives the image / audio data multiplexed and transmitted from the videophone device of the other party, and when demodulated by the modulator / demodulator 17 and input, the CPU 21 separates the demodulated image / audio data,
The compressed image data is output to the image compression / expansion circuit 28 described later via the bus 18, and the compressed audio data is output to the audio processing unit 16 via the bus 18. Further, the CPU 21 causes the image compression / expansion circuit 28 to access the bus 1
8 and compressed image data input via the audio processing unit 16
Is multiplexed with compressed audio data input via the bus 18 and output as image / audio data to the modulator / demodulator 17 via the bus 18. Further, the ROM 22 is
The RAM 23 is a CPU that is a semiconductor memory that stores programs and data used in the videophone device 1.
21 is a semiconductor memory that stores program data used in the program processing executed by the CPU 21, compressed image data, audio data, and the like.

The camera unit 13 includes a lens 24, a CCD (Ch
arge Coupled Device) 25. The lens 24 is an optical lens made of glass or plastic provided in the main body of the videophone device 1.
D25 generates an electric signal based on the intensity of the light imaged by the lens 24, and this electric signal (analog signal)
Is output to the image processing unit 14.

The image processing unit 14 includes an ADC (Analog to Di
A digital converter (A / D converter) 26, a color processing circuit 27, an image compression / expansion circuit 28, a counter 29, and a dual port memory 30 used as a video memory (VRAM). The ADC 26 converts an image signal (analog signal) input from the camera unit 13 into a signal (digital signal) that can be processed in the image processing unit 14 and outputs the signal to the color processing circuit 27. The color processing circuit 27 includes a color signal modulation circuit that modulates two color difference signals (RY, BY), a color signal reduction conversion circuit, and the like.

The image compression / expansion circuit 28, for example, according to a predetermined encoding method of the image data, that is, the type of image to be handled (still image in this case), for example, JPEG (Joint Ph
OTographic (Coding) Experts Group) algorithm is used to perform compression processing (encoding) by DCT (discrete cosine transform), quantization, and Huffman encoding for each 8 × 8 pixel block, and is also received via communication line 2. The received compressed image data demodulated by the modulator / demodulator 17 is expanded (decoded), and the expanded image data is output to the dual port memory 30.

The dual port memory 30 is a VRAM.
The image compression / expansion circuit 14 is composed of (Video RAM).
This is a semiconductor image memory for counting the image data compressed and expanded by the counter 29 and storing it as image data.

The liquid crystal display unit 15 includes a DAC (D-igital t
o Analog Converter: D / A converter) 31, DD
(Display Driver) 32, LCD (Liquid Crystal Di-
splay) 33 and an I / O port 34.

The DAC 31 is a dual port memory 30.
Image signal (digital signal) of image data stored in
That can be displayed on the LCD 33 (analog signal)
It is converted to and output. In this example,
A DAC (D / A converter) is required because an analog data driver is used as the data driver of the LCD 33 described later. However, when a digital data driver is used as the data driver, this DAC 31
Is unnecessary. The DD 32 drives the LCD 33 to display an image on the LCD 33 based on a video signal input from the image processing unit 14 or a video signal input from a video input terminal (not shown). LC
The D33 is composed of, for example, a color liquid crystal display device having a TFT (Thin Film T-ransistor) type liquid crystal display panel which is one of active matrix systems, and is driven by the DD32 to display a color video signal of a maximum of 4096 colors (12 bits). Is displayed.

The audio processing section 16 comprises an ADC 35, an audio compression / expansion circuit 36, and a DAC 37. ADC
Reference numeral 35 is for converting an audio signal (analog signal) input from the modulation / demodulation unit 17 into a signal (digital signal) that can be processed in the audio processing unit 16 and outputting the signal to the audio compression / expansion circuit 36. The audio processing unit 16 converts the digital audio data input from the ADC 35 into, for example, CELP (Code-E
xcited Linear Predivtion algorithm compresses (encodes) by a predetermined coding method by means of analyzing input data for a certain period of time, means for synthesizing waveforms based on analyzed parameters, means for calculating errors between input waveforms and synthesized waveforms, etc. ) Processing is performed, and the compressed audio data is DA
The expanded compressed audio data is output to C37, or the compressed compressed audio data demodulated by the modulator / demodulator 17 is expanded (decoded), and the expanded audio data is output to the DAC 37.

The modem 17 is a modem (MODEM, MOdulati).
on and DEModulation) 38, NCU (Network Contro)
l Unit) 39. 40L, 4
0T is an input / output terminal for a communication line (in this case, a general subscriber line) 2, 40L is on the side of a modular jack type outlet, and 40T is on the side of a facsimile device 3 or a telephone device 4 via a modular cable. Connected. The modem 38 and the NCU 39 have a function as a “modulator” that converts and transmits a serial digital signal output from a computer or a terminal device into a transmission signal (analog signal) that can be transmitted through a communication line, The "demodulator" (demodulator) that converts the transmission signal (analog signal) sent via the communication line into the digital signal that can be decoded by the computer or terminal device.
) ”As a function of the NCU39.
As a result, it is possible to use a general subscriber line as a communication line to be used.

The bus 18 includes a key input unit 11 and a control unit 1.
2. A common signal path that connects the image processing unit 14, the audio processing unit 16, and the modulation / demodulation unit 17, and is composed of an address bus for instructing an address and a data bus for transferring data. .

FIG. 3 is an internal block diagram of the NCU 39.

In FIG. 3, the NCU 39 enables the input image data and voice data to be transmitted through the general subscriber line, and uses the image data and voice data transmitted through the general subscriber line in the terminal device. A 2W-4W conversion circuit 41 for converting as much as possible, a ringing tone detecting circuit 42 for detecting a ringing tone, a polarity detecting circuit 43 for detecting polarity, a ringer 44 for acoustically notifying an incoming videophone call, and a ringer 44. The speaker 45 that outputs the acoustic signal generated by the CPU 2 and the CPU 2 based on the response from the partner terminal.
The relay 46 switches the connection state to be connected to the videophone device 1 so as to be connected to the facsimile device 3 or the telephone device 4 in accordance with the result determined in step 1. Here, the NCU 39 is the CPU 21 described later.
The communication terminal is used to identify the partner terminal in the call setup phase by using the two frequencies of the calling tone and the called station identification tone that are not specified by the facsimile device or data modem by the communication mode switching process by The relay 46 is provided for switching the connection state so as to match the same communication condition.

4A and 4B are diagrams showing the videophone identification tone. FIG. 4A shows the calling tone of the calling side videophone device, and FIG. 4B shows the called side of the called side videophone device. 5 illustrates a call identification tone.

The videophone identification tone shown in FIG. 4 is a line adjustment signal newly provided in the videophone device 1 of this embodiment. Although the standard is the same as the transmission procedure of the conventional facsimile machine defined in No. 30 (see FIG. 6), it is made to be distinguishable from the standard of the facsimile machine as shown in FIG. For example, as shown in FIG. 4A, the videophone device on the calling side outputs a call tone signal for outputting a signal of 1500 Hz for 1 second and resting for 2.5 seconds. In addition, in the videophone device on the called side, as shown in FIG.
The signal of z is output for 4 seconds, and the call identification tone that repeats the rest of 75 ms is output.

Comparing this videophone identification tone with the facsimile device identification tone shown in FIG. 6, first,
The frequencies of the identification tones of the calling side and the receiving side are 1500 Hz for the videophone device and 1100 Hz for the facsimile device.
By setting to 100Hz, it becomes possible to distinguish between
Furthermore, as shown in FIG. 4 (a), the signal of 1500 Hz is output from the videophone device on the calling side for 1 second to 2.5
A calling tone signal indicating a second rest is output, and the calling facsimile machine outputs 1100H as shown in FIG. 6A.
If a calling tone signal that the z signal is output for 0.5 seconds and then rests for 3 seconds is output, the call identification tone within 4 seconds is generated in both cases, and the facsimile device and other telephone devices and the like are connected. In addition to the identification, the videophone device and the telephone device with answering machine can be identified within 4 seconds.

Next, the operation of this embodiment will be described.

Overall Operation of Video Telephone Device First, the operator lifts the receiver of the video telephone device 1 to put it in the off-hook state, and the telephone number of the communication partner is input, whereby the NCU 39 makes a dial call.

Then, it is determined whether or not the communication line 2 is connected. If the communication line 2 is not connected, redial is executed until the communication line 2 is connected.

When the communication line 2 is connected, the following transmission processing and reception processing are executed.

In the videophone device 1 of this embodiment, the image data processing and the voice processing are simultaneously executed in parallel in the transmission processing and the reception processing. Therefore, the transmission processing will be described below. The processing will be described separately, and the reception processing will be described separately as an image reception processing and an audio reception processing.

In the image transmission processing, the image data picked up by the camera unit 13 is input to the image compression / expansion circuit 28 via the ADC 26 and the color processing circuit 27, compressed by the image compression / expansion circuit 28 and stored in the dual port memory 30. Is stored.

The compressed image data is sent to the bus 18
Is output to the modulation / demodulation unit 17 via the communication unit and transmitted to the communication partner.

In the voice transmission process, the voice data input from the receiver of the telephone device 4 is output to the ADC 35 via the modulator / demodulator 17, and the voice compression / expansion circuit 36 compresses the voice data by a predetermined compression process.

The compressed audio data is transferred to the bus 18
Is output to the modem 38 in the modulation / demodulation unit 17 via
It is transmitted to the communication partner (for example, the videophone device 1, the facsimile device 3 or the telephone device 4) via the U39 and the input / output terminal 40L.

In the image receiving process, the modulation / demodulation unit 17 determines the presence / absence of the image reception signal. If the image reception signal is present, the demodulated image data is output to the image processing unit 14 via the bus 18 and received. The image data is expanded by the image compression / expansion circuit 28.

The decompressed image data is stored in the dual port memory 30 and the liquid crystal display unit 1
5, and is displayed on the LCD 33.

In the voice receiving process, the modulator / demodulator 17 determines the presence or absence of the voice receiving signal. If the voice receiving signal is present, the demodulated voice signal is output to the voice processor 16.
The received audio data is output to the audio compression / expansion circuit 36 via the bus 18 and expanded by the audio compression / expansion circuit 36.

Then, the decompressed audio data is converted to DAC3.
Is output to the NCU 39 in the modulation / demodulation unit 39 via
The connection state is switched by the relay 46 in the CU 39, and voice is output to the videophone device 1 via the input / output terminal 40L or to the facsimile device 3 or the telephone device 4 via the input / output terminal 40T.

The above-mentioned transmission / reception processing is repeatedly executed until the receiver of the videophone device is placed in the on-hook state.

FIG. 5 is a flow chart showing the communication mode switching process of the video telephone apparatus executed by the CPU 21 in the control unit 12. This flow is a communication mode switching process of the calling side and a communication mode switching process of the called side. It shows a flow showing. In the figure, reference numeral An (n = 1, 2, ...)
Indicates each step of the flow on the calling side by the code Bn (n = 1,
2, ...) shows each step of the flow on the called side.
The program corresponding to this processing operation is the control unit 1
2 is stored in the ROM 22.

On the calling side, first, at step A1, it is checked whether or not a dial tone is heard, and if a dial tone is heard, the dial is made at step A2. The called side receives this dial signal and determines in step B1 whether or not ring detection is made. When ring detection is made, in step B2 a response is made to the calling side.

On the calling side, after dialing in step A2, it is determined in step A3 whether or not a ring tone is heard.
If the ring tone is not heard, it is determined in step A4 whether or not the predetermined time has passed. If the predetermined time has not passed, the process returns to step S3. If the ring tone is not heard even after the predetermined time has passed, Hang up, judging that you cannot talk to the other party.

When the called side receives the dial signal from the calling side, performs ring detection in step B1 and responds to the calling side in step B2, the calling side receives this response signal. In step A5, the calling tone (Fig.
(See (a)). The called side receives the calling tone and determines in step B3 whether or not the calling tone is detected. When the calling tone is not detected, the called device is not the facsimile device or the videophone device but the telephone device. When the calling tone is detected, it is determined in step B4 whether the calling tone is that of the facsimile machine. If the calling tone is that of the facsimile machine, then in step B5 a called identification tone is sent to the calling side, the communication mode on the called side is switched to the FAX mode and the processing is completed, and the calling tone is that of the facsimile machine. If not, it is determined that the device is a videophone device, and in step B6, the called party is identified by the called party (FIG. 4 (b)).
) Is sent to switch the communication mode on the called side to the videophone mode, and the process ends.

At the calling side, it is judged at step A6 whether or not the called identification tone sent from the called side is received.
When the called identification tone is not received, it is determined in step A7 whether or not voice is detected. When the called identification tone is not received and the voice is detected, it is determined that the telephone device is not the facsimile device or the videophone device, and the communication mode on the called side is switched to the communication mode to finish the process. If no voice is detected, it is determined in step A8 whether or not the predetermined time has elapsed. If the predetermined time has not elapsed, the process returns to step A3 to wait for reception of the called identification tone, and the predetermined time has elapsed. Even if the called identification tone is not received and the voice is not detected, it is determined that the call cannot be made with the other party and the call is hung up.

When the called side identification tone transmitted from the called side is received in step A9 of the calling side, it is determined in step A9 whether or not the called side identification tone belongs to the facsimile machine. When the called identification tone is that of the facsimile apparatus, the communication mode on the calling side is switched to the FAX mode and the processing ends, and when the called identification tone is that of the videophone apparatus shown in FIG. The communication mode on the side is switched to the videophone mode, and the process ends.

As described in the communication mode switching process, as the calling side operation, the calling tone is sent out in accordance with the normal calling procedure. A videophone device, an externally connected facsimile device, and a telephone device are selected according to the selection of the calling side. The calling tone sends the selected one. In this case, if the partner terminal is known, each communication mode is simply selected, but if the partner terminal is unknown, the response from the partner terminal is followed as shown in the above-described flow. That is, each device is selected by detecting the called identification tone and voice as a response from the partner terminal, and the relay 46 of the NCU 39 is switched according to the partner terminal.

On the other hand, the operation on the called side is almost the same as the operation on the calling side, but the difference from the calling side is that the partner terminal seen from the calling side is always an unknown terminal, and the videophone. Functions other than the device (for example, FAX function) must be detected. That is, it is necessary to transfer control to an externally connected device, and especially to distinguish between a facsimile device and a videophone device. Therefore,
Similar to the operation on the calling side, a called identification tone having a frequency different from that of the facsimile machine is transmitted and a response is returned to the partner terminal.

According to this method, since the processing can be performed in the call setting mode without entering the call mode (data transfer), the partner terminal can be specified in a short time and the own device can be matched with the same as the partner terminal.

As described above, in the present embodiment, the image data and the audio data to be transmitted are provided with an identification signal that can be distinguished from the standard of the facsimile apparatus and indicate the data transmission from the videophone apparatus, and the NCU 39 But CPU
In accordance with the communication mode switching processing by the reference numeral 21, the partner terminal is identified in the call setup phase by using two frequencies, which are the calling tone and the called station identification tone, which are not specified by the facsimile machine or the data modem, and the partner terminal which identifies itself is identified. Since the connection state is switched by the relay 46 so as to match the same communication condition as the above, when the videophone device is connected together with the facsimile device or the telephone with the answering machine, the call mode (data transfer) is entered. It is possible to perform processing in the call setting mode without having to do so, and to identify the partner terminal in a short time and match the own device with the same as the partner terminal. For example, when the videophone identification tone shown in FIG. 4 is provided for the conventional facsimile device identification tone as shown in FIG. 6, the frequencies of the identification tone of the calling side and the called side are set to the videophone device and the facsimile device. By making them different from each other, it is possible to identify the two, and further, the calling side videophone device outputs a signal of 1500 Hz for 1 second and rests for 2.5 seconds as shown in FIG. 4 (a). A tone signal is output, and the facsimile machine on the originating side outputs the tone signal shown in FIG.
As shown in (a), a 1100 Hz signal is output for 0.5 seconds and a call tone signal indicating that a rest of 3 seconds is to be output, so that identification can be performed within 4 seconds.
As a result, it is possible to specify the partner terminal in a short time, so that it is possible to reduce the line usage fee during distribution of the communication, and it is possible to immediately communicate with the partner terminal, which improves usability.

In this embodiment, the videophone identification tone as shown in FIG. 4 is used, but it can be distinguished from the standard of the facsimile apparatus as shown in FIG. 6 and is data transmission from the videophone apparatus. It goes without saying that any identification signal may be used as long as it is a signal that can identify that.

The image data compression method is not limited to the JPEG algorithm in this embodiment, and may be, for example, a block coding method, a predictive coding method, an orthogonal transform coding method, or the like. The data compression method is not limited to the CELP algorithm in this embodiment, but may be, for example, AD-PCM (Adaptive Differenti-
al Palse Code Modulation) method, VSELP (Vector
A Sum Excited Linear P-rediction) method or the like may be used.

[0065]

Advantages of the Invention Claims 1, 2, 3, 4, 5, 6, 7, 8
According to the inventions described in (3) and (9), the image data and the audio data to be transmitted are provided with the identification signal indicating that the data transmission is from the videophone device. The user can select the communication system from an unspecified other party without making the user aware of the communication system and communicate with the other terminal under the same conditions. As a result, it is possible to specify the partner terminal in a short time, reduce the line usage fee, and immediately communicate with the partner terminal, which improves usability.

[Brief description of drawings]

FIG. 1 is a diagram showing a connection state of a videophone device.

FIG. 2 is a block diagram of a videophone device.

FIG. 3 is a block diagram of an NCU of a videophone device.

FIG. 4 is a diagram showing videophone identification tones of a videophone device.

FIG. 5 is a flowchart showing a communication mode switching process of the videophone device.

FIG. 6 is a diagram showing a facsimile identification tone of a facsimile apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Videophone device 2 Public telephone line 3 Facsimile device 4 Telephone device 11 Key input unit 12 Control unit 13 Camera unit 14 Image processing unit 15 Liquid crystal display unit 16 Voice processing unit 17 Modulation / demodulation unit 18 Bus 21 CPU 22 ROM 23 RAM 38 Modem 39 NCU 41 2W-4W conversion circuit 42 Ring tone detection circuit 43 Polarity detection circuit 44 Ringer 45 Speaker 46 Relay

Claims (9)

[Claims] 1. A data modulation / demodulation means for modulating or demodulating image data and audio data and simultaneously transmitting the image data and audio data through a communication line, and a display means for displaying predetermined image data. In the videophone apparatus, the data modulation / demodulation means includes means for transmitting an identification signal indicating data transmission from the videophone apparatus when making a call. 2. A data modulation / demodulation means for modulating or demodulating image data and audio data, and simultaneously transmitting the image data and audio data via a communication line, and a display means for displaying predetermined image data. In the videophone apparatus, the data modulation / demodulation means includes means for transmitting an identification signal indicating that the receiving terminal is the videophone apparatus when the predetermined identification signal is received. 3. A data modulation / demodulation means for modulating or demodulating image data and audio data, and simultaneously transmitting the image data and audio data through a communication line, and a display means for displaying predetermined image data. In the videophone device, the data modulation / demodulation means adds an identification signal indicating that the data is transmitted from the videophone device prior to transmitting the image data and the audio data through the communication line, and transmits the data. A video telephone device characterized in that, when receiving the image data and the audio data, the partner terminal is identified by the identification signal sent prior to the transmitted data. 4. A data modulation / demodulation means for modulating or demodulating image data and audio data, and simultaneously transmitting the image data and audio data through a communication line, and a display means for displaying predetermined image data. In the videophone device, the data modulation / demodulation means adds an identification signal indicating that the data is transmitted from the videophone device prior to transmitting the image data and the audio data through the communication line, and transmits the data. When the received image data and audio data are received, the other terminal is identified by the identification signal sent prior to the transmitted data, and the same communication condition as the identified other terminal is adapted. Videophone device. 5. The videophone device according to claim 1, 2, 3, or 4, wherein the communication line is an analog public line. 6. The data modulation / demodulation means identifies a partner terminal in a call setup phase by using a plurality of frequencies as a calling tone and a called station identification tone, and adjusts to the same communication condition as the identified partner terminal. 5. The videophone device according to claim 1, claim 2, claim 3, or claim 4. 7. The identification signal according to claim 1, 2, 3 or 4, wherein the identification signal is an identification signal which can be distinguished from a communication standard defined by a facsimile machine or a data modem. The videophone device according to any one of claims. 8. The identification signal according to claim 1, wherein one cycle of an output period of a predetermined frequency signal and a rest period is 3.5 seconds or less. The videophone device according to any one of 4 above. 9. The data modulation / demodulation means has an input / output terminal connected to an analog public line and an input / output terminal connected to a terminal including a facsimile apparatus or a telephone apparatus.
The video telephone device according to any one of claims 1, 2, 3, and 4, wherein the video telephone device is provided between the analog public line and a terminal.