JPS58141069A - Data communication system - Google Patents

Abstract

PURPOSE:To transmit character, voice, and still-picture signals through the same circuit and to use a flexible disk device for the recording of composite media in common by storing low-speed data in a subordinate memory, and reading it at a high speed and then recording on a flexible disk. CONSTITUTION:When a still picture is received, a low-speed signal is inputted to an analog type subordinate memory 2 through an input/output terminal 1. The subordinate memory 2 receives it by, for example, two line memories alternately; while one memory is in receiving operation, the other performs high-speed reading operation. An analog signal read out of the subordinate memory 2 is recorded on the flexible disk (FD) 3. On the FD3, one-screen data is all recorded and when this is reproduced and outputted to a TV receiver 5, the one-screen data is read at a high speed of 1/60 second to send FM-modulated data of about 5MHz to a signal conversion part 4. The signal conversion part 4 converts it into a video signal and then outputs the still picture to the TV receiver 5. The use of VTR6 is exactly the same.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a data communication system, and in particular, the present invention relates to a data communication system, and in particular, to a Th1. li [
The present invention relates to a multimedia communication method performed by one terminal.

Data processing of encoded digital signals such as characters and figures, usually by facsimile or data communication, is carried out via a memory medium, allowing sufficient thinking time, and It is possible to report missed calls.

On the other hand, with 9T real-time communication by telephone, etc., people can directly confirm each other's voices and contact each other.
Moreover, if scissor image signals are added to real-time communication, it will become possible to hold financial meetings, lectures, etc. between distant points using television. However, conventional data communication equipment is While it is used to handle only data, voice is transmitted by telephone, and images are transmitted separately by facsimile and television.

In order to achieve advanced and effective communication, it is desirable to have a communication system that handles these media in a complex manner, and advances in speech synthesis technology and semiconductor integration technology are making complex media communication possible.

By the way, communication in which coded digital signal data such as characters and figures and audio data of an asymmetry signal are mixed on the same route has rarely been carried out in the past. However, as a method for communicating over the same communication channel, a method is known in which a digital data communication mode and a voice communication mode are clearly separated and a person switches between the modes.

In that case, voice communication (communication using real voices) is performed in a human-to-human relationship.

In recent years, speech synthesis technology has reached a practical level and is being effectively used in various fields, such as outputting stylized sentences as voice. Speech synthesis technology has made voice communication possible not only between people, but also between people at a center or between a processing device including a computer and a person.

On the other hand, when transmitting an image via a telephone line, the amount of information is large if you try to transmit it as a digital signal. It must be sent for 10 minutes or more. In the future, if digital 1-wire becomes widespread, high-speed transmission will become possible, but it is unlikely that this will become a reality.
This is expected to be more than Flo years away.

On the other hand, a problem when transmitting still images from the transmitting side and playing them back on the receiving side with a television signal is that the signal band that can be transmitted by a telephone line is 4KH1. The point is that a band of 4 to 6 MH1 is required.

In the future, terminal devices will be equipped with 7
When using a Lexiple Disk (product name Near 0 Tupdy, Sufu) or a 7 Lexiple Disk as a recording medium for wall still image information, which is expected to be widely used, a conventional 7 Lexiple Disk device for data communication is used. cannot be shared as is.

The purpose of the present invention is to solve these problems by making it possible to transmit voice and still images in addition to character data over the same line, and to use a 7-lexiple disk device in common for recording these composite media. The purpose of the present invention is to provide a data communication system that can reduce the cost of terminal devices.

The data communication system of the present invention performs data communication via a telephone line and stores data using a 17 flexible disk device, which analyzes voice and still image data in addition to character data. The analog signal is sent and received as a signal, and some ≠ are converted into digital data and stored in the 7 lexical disk devices, and then output, and the 7 lexical disk devices are shared, or some ≠ are stored in a separate secondary memory. It is characterized in that it is provided to temporarily store audio and still image data and perform time axis conversion.

Embodiments of the present invention will be described below with reference to the drawings.

Fig. 1 is a block diagram of a data communication system showing an embodiment of the present invention, and Fig. 3 is a signal processing waveform diagram in Fig. 1. On the receiving side, the 1M modulated data transmitted at low speed over a telephone line is temporarily recorded in a rigid memory, and then read out at high speed and recorded on a 7-lexiple disk as a signal of approximately 5MH.

When transmitting data, the data is read out from the lexical disk and written in the secondary memory at high speed, and then read out at low speed and sent to the line. This made it possible to transmit not only text data but also audio and still images over the line, and also made it possible to use a flexible disk device for recording text data and audio and still images.

In Fig. 1, 1 is the input/output terminal to the line, 2 is the memory of the analyzer, 3 is the 7 lexical nice # device, 44
is the signal converter, and 6 is the television receiver 1161 ma'! ”
R (video recorder). 1, the transmitter/receiver circuit is connected to the front stage of the rigid frame 92. Figure 6 (→
is a write signal to the sub memory 2, and FIG. 3cb) is a read signal from the hard memo 92.
Writing to Lexiple Disk 3, Figure 4 (Q
1 and 2 respectively indicate signals after conversion in the signal conversion section.

The terminal device shown in the first panel is configured by integrating all of the circuits into the Anaga device.

When this terminal device receives a still image, a signal in a band of about 41 M, which is transmitted from the IM via the line, is input to the analog arm memo 92 via the input/output terminal 1.

The analog submemory consists of two analog sub-memories, for example two line memories, which receive data alternately, and while one of them is receiving data, the other one is reading it out at high speed. For example, the write signal to the sub memory 2 is 3.
When plotted at 0 seconds, it is a single period waveform as shown in Figure 3 (a), but when the signal is read out from the sub memory 2 at high speed, multiple waveforms appear as shown in Figures 3~). The analog signal read from the memory 2 is then transferred to the 7lexiple disk 3 and recorded thereon. The write signal at that time has a waveform as shown in FIG. 3(0). In this way, all the data for one screen is recorded on the 7lexiple disk 3, and when this is further reproduced and output to the television receiver 6, the data for one screen is read out at a high speed of 1/60 seconds. , about 5 MH, is sent to the signal converter 4. Signal conversion [4
When it receives this, it converts it into a video signal as shown in FIG. 3(d), and then outputs the still image to the television receiver 6.

Furthermore, even when using a VTR 6, still images can be recorded and reproduced by performing signal processing in exactly the same manner.

In this way, in the present invention, the 7 lexical memory 3 and the sub memory 2 are provided, but the sub memory 2 is, for example, 7 lexical memory 3 and the sub memory 2.
By sharing Lexiple disk 3, both can be integrated into one
It can also be done individually.

In this case, by changing the signal recording speed and reading speed each time, both operations can be performed.
The head of a 7-lexiple disk device is normally used for digital signals and has a wide gap and the maximum magnetic flux density of the core is low. Recording - playback can be made possible. However, the 1.7 Lexiple disk device 3 must be used for still image data and character data.

In addition, an analog IC memory can be used as the playlist 2. In this case, recording and playback speeds can be converted by converting the sampling frequency.

Furthermore, in the future there will be 8 ng 'l' (gtatis: [n
aution' [”laneiator Logi
c) If the memory is put into practical use, it can be used as the secondary memory 2.

FIG. 2 is a block diagram of a data communication system showing another embodiment of the present invention, and FIG. 4 is a signal processing waveform diagram in FIG. 2.

@2 In FIG. 2, 7 is an A/D converter, 8 is a D/A converter, and other symbols are the same as in FIG. The terminal device shown in FIG. 2 has all its circuits integrated into digital processing, and performs D/A conversion and A/D conversion when inputting and outputting data to and from lines and equipment used. - When this terminal device receives a still image, if the FM modulation signal input from line power 1 is plotted over a period of, for example, 30 seconds, it will have a single-period waveform as shown in Figure 4 (&), but
When converted into a digital signal by the converter 7, it becomes an &fPCM code, for example, as shown in FIG. 4(b). Next, the digital signal is recorded in a digital signal format on a 7-lexiple disk 3 by a normal 7-lexiple disk device (see Figure 4 (C)).
.

During playback, after data is read from the flexible disk drive 3 to the secondary memory 2, data is read out from the secondary memory 2 at high speed, as shown in the pulse waveform in FIG.
Next, the high-speed digital signal is converted into an analog signal by the D/MU conversion section 8, and then converted into a video signal shown in FIG. Exactly the same process is performed when outputting to the VTR 6.

In addition, when transmitting a still image, by connecting the D/A converter 8 to the line transmission circuit, the digital signal stored in the lexical disk device 3 can be read out at high speed, and the digital signal can be stored in the sub memory 2 at high speed. After loading, it is read out at low speed and converted into an analog signal (FM modulated signal) by the D/A converter 8, and then sent to the line. Therefore, in FIG. 2, as a 7-lexiple disk δ, A conventional digital signal disk can be used for the tt. Further, an IC memory is used as the sub-memory 2, and data is repeatedly read out at high speed and data is continuously sent out at a speed that matches the synchronization signal of the television receiver 6.

Furthermore, in the signal recorded on the flexible disk 3, the luminance signal and the color difference signal may be separately separated.
Make a decision based on image quality.

[Brief explanation of the drawing]

Figure 1 is a block diagram of a data communication system showing an embodiment of the present invention, Figure tJ2 is a block diagram of a data communication system showing another embodiment of the invention, and Figures 3 and 4 are respectively similar to Figures 1 and 4. FIG. 3 is a signal processing waveform diagram of FIG. 2; 1: Return terminal, 2: Secondary memory, 3: 7 Lexiple disk, 4: Signal converter, 5: Television receiver, 6: VTR, 7j A/D converter, 8° D/A converter . yp burial person yp burial person
. Figure 1 Figure 2 5 Figure 31 1 1) 4th P; 4 1

Claims (1)

[Claims] A data communication device that performs data communication via a telephone line and stores data using a 7xible disk device, which stores voice and still image data in addition to character data. Transmit and receive the analog/4G signal, and send/receive the analog/VG signal as 11. Or digitally convert it to the above 7 Lexiple disk device! After multiplying, output the 7 lexical
A data communication system characterized by sharing a disk device or providing a separate sub-memory to temporarily store audio and still image data and convert the time axis.