JPH0730561A - Picture data reception terminal equipment - Google Patents

Abstract

PURPOSE:To improve convenience by applying relevant analog conversion to picture data in a digital state selected from a frame memory and displaying a still state to cause a predetermined oscillation. CONSTITUTION:A host NTSC signal is sent from a host to a LAN cable 5 and an analog switch 6 of an n-th terminal equipment 4 is thrown by a predetermined time to a position of an A/D converter section 4E. The conversion section 4E receives the NTSC signal and converts it into a digital signal and stores picture data of each prescribed unit to a frame memory 4F. The memory 4F has two unit sections at least storing picture data in a predetermined unit. Then the picture data stored in the memory 4F are converted into an analog signal at a D/A converter/oscillation section 4G, the signal is set to a predetermined oscillation state in the oscillation function section of the oscillation section 4G and displayed on an n-th CRT4A as a still picture.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image data receiving terminal device, and more particularly to an image data receiving terminal device which can be conveniently applied to an image data LAN system which is characterized by a transmission mode of image related data. is there.

[0002]

2. Description of the Related Art In a conventional LAN system according to this type of technology, there are two data transmission systems, [1] baseband system; [2] broadband system; It has features. That is, regarding [1] baseband system; normal image data is transmitted based on a digital format. For this reason, when transmitting certain required image data to a target point, first, the corresponding A / D conversion is performed on the image data (analog signal) to be transmitted at the transmission source, and the image converted into a digital signal. After receiving the data at the receiving destination, the corresponding D / A conversion is performed at the receiving destination. By doing so, the receiving destination can receive the required image data in the form of an analog signal. On the other hand, as for [2] Broadband method; transmission of image data from transmission to reception is always performed based on an analog format. As prior publications disclosing this type of technology, For example, ["heterogeneous connection and LAN
Picture and reading book ”, edited by Seiji Uehara: May 20, 1991 (first edition): published by Ohmsha Ltd.].

By the way, the above-mentioned [1] baseband system and [2] broadband system have the following drawbacks. That is, [1] In the baseband system: (A) As described above, it is necessary to provide the A / D conversion means and the D / A conversion means, and the target system configuration becomes more complicated; B) For example, when transmitting predetermined 1-pixel data included in certain required image data, a certain number of bits (for example, 8 bits) are required to digitize the 1-pixel data.
(Bits) are required and this transmission is performed serially, which tends to increase the time required for data transmission between the transmission source and the reception destination. (C) As described above, The signals transmitted on the LAN are in digital format, and corresponding software is required to convert the image data to be transmitted into digital format. Thus, the software for operating the system applied to the above-mentioned baseband system becomes so complicated. [2] In the broadband system: (D) The transmitting terminal side needs a means for modulating the once encoded image data, and the receiving terminal side demodulates the transmitted modulated signal. Means are needed. Further, when data is exchanged with some terminals connected to a LAN, a required coaxial cable may be used for the transmission of the data, and a reverse signal from a certain predetermined terminal may be transmitted to other terminals. It is necessary to provide a specific means of a headend remodulator at the end of the coaxial cable so that it is forwarded to the terminal. Thus, the system applied to this broadband system may be so expensive; (E) As mentioned above, this system requires some specific means. Yes,
As the scale of the system becomes larger and its configuration becomes more complicated, it becomes difficult to maintain or maintain the applicable system, and the labor of the personnel in charge increases accordingly. (F) This The modulation frequency for some terminals connected to the LAN in the system is usually fixed, but when considering the construction of the entire system to be applied, due to the above-mentioned restrictions due to the nature of the system, With respect to the above, it becomes extremely difficult to arbitrarily expand the desired function, and the expandability of the system is reduced accordingly, and it becomes difficult to meet the demand such as an increase in scale.

[0004]

By the way, the above-mentioned conventional techniques [1] baseband system and [2] are known.
Each of the broadband systems has the following problems. That is, in the [1] baseband system:
(A) A / D conversion means and D / A conversion means need to be specially provided, and the configuration of a target system becomes more complicated; (B) data transmission between a transmission source and a reception destination (C) the software for operating the system becomes more complicated;
There was a problem. [2] In the broadband system: (D) Since the image data as an analog signal is supported, the applied system tends to be expensive; (E) It is difficult to maintain and maintain the applied system. And the labor of the personnel in charge increases accordingly;
(F) There is a problem that the applied system has no expandability and it is difficult to meet the demand such as an increase in scale.

The present invention has been made in order to solve the above-mentioned problems, and is an image data receiving terminal device which can be conveniently applied to an image data LAN system characterized by a transmission mode of image-related data. Yes: a data receiving section 4B for processing digital data for data communication; an image data control section 4C for controlling the frame memory 4F and the D / A conversion section / oscillation section 4G; and external data input Section / display section 4D as a main function, and A / D conversion section 4E that performs corresponding digital conversion on image data transmitted in an analog state;
A frame memory 4F having at least two unit units for storing digitized image data for each predetermined unit; and a corresponding analog conversion for image data in a digital state selected from the frame memory 4F side. It is an object of the present invention to provide an image data receiving terminal device including a D / A conversion unit / oscillation unit 4G for causing a predetermined oscillation so as to enable display in a stationary state. .

[0006]

The present invention has been made to achieve the above object, and an image data receiving terminal device according to the present invention is: data receiving for processing digital data for data communication. An image data control unit 4C for controlling the frame memory 4F and the D / A conversion unit / oscillation unit 4G; and an external data input unit /
A digital function unit mainly including a display unit 4D, and an A / D conversion unit 4E that performs corresponding digital conversion on image data transmitted in an analog state; digitized image data is stored for each predetermined unit. A frame memory 4F having at least two units; and a predetermined oscillation so as to perform corresponding analog conversion on image data in a digital state selected from the side of the frame memory 4F and enable display in a stationary state. D / for
And a digital function section mainly including an A conversion section / oscillation section 4G.

[0007]

The image data receiving terminal device according to the present invention includes: an A / D conversion unit 4E for performing corresponding digital conversion on image data transmitted in an analog state; storing digitized image data for each predetermined unit. At least 2
A frame memory 4F having a single unit; and corresponding analog conversion of image data in a digital state selected from the side of the frame memory 4F, and causing a predetermined oscillation so as to enable display in a stationary state. It is characterized in that it is configured to include a D / A conversion unit / oscillation unit 4G for this purpose, and the number of storage unit units of the image data stored in the used frame memory 4F can be any number. Therefore, by storing individual image data in an independent state in any desired number of units, various images can be quickly switched and retrieved, and the convenience of the device is improved accordingly. The advantage of doing so.

[0008]

1 is a schematic diagram showing an image data LAN system to which an image data receiving terminal device according to an embodiment of the present invention is applied. In FIG. 1A, a host 1 is a data processing means such as a suitable personal computer or workstation, and a large-capacity memory 1A attached to the host 1 is, for example, a storage capacity required. It is a storage means such as an external disk device or a hard disk device provided with. First terminal 2, second terminal 3, ...
The terminal means such as the nth terminal 4 may be, for example, a data processing means such as an appropriate personal computer or workstation similar to the above-mentioned host 1, and is required by the operator in charge of each terminal. It is supposed to do the work. In addition, the first CRT (2A), the second CRT
(3A), ... The plurality of display means such as the nCRT (4A) may be, for example, a commercially available CRT device similar to a cathode ray tube of a TV receiver, under the instruction from the corresponding terminal means. The required image is displayed on the screen. Further, as the cable means 5 for mutually connecting the host 1 and the first terminal 2, the second terminal 3, ... The n-th terminal 4, for example, a coaxial LAN cable can be used. An image data LAN system to which the image data receiving terminal device according to the embodiment of the present invention can be suitably applied is configured by combining these means.

FIG. 2 is a block diagram showing the image data receiving terminal device of the above embodiment. In FIG. 2, a required terminal (in the example of FIG. 2, the n-th terminal 4) is connected to the coaxial LAN cable 5 via a corresponding analog switch 6.
Are connected. The nth terminal 4 is composed of the following digital function section and analog function section. That is, a data receiving section 4B for processing digital data for data communication; a frame memory 4F described later.
And an image data control unit 4C for controlling the D / A conversion unit / oscillation unit 4G; and (for example, a keyboard or L
A digital function unit mainly including an external data input unit / display unit 4D (such as a CD), and an A / D conversion unit 4E that performs corresponding digital conversion on image data transmitted in an analog state; digitized image A frame memory 4F having at least two unit units for storing data in predetermined units; and corresponding analog conversion of image data in a digital state selected from the frame memory 4F side, and a stationary state. D / A converter for oscillating a predetermined value to enable display at
It is composed of an analog function section mainly including an oscillating section 4G.

Next, the operation of the apparatus of the above embodiment and the system related thereto will be described. [1] The analog switch in each of the first terminal 2, the second terminal 3, ..., The n-th terminal 4 is tilted to the data communication processing side at the time of resetting each. [2] Now, assuming that it is necessary to transmit image data to the nth terminal 4, first, for the first terminal 2, the second terminal 3 ,. A "communication-disabled command" is issued from the host 1 side (for example, 0.1 ms). As the “communication-disabled command”, for example, as shown in FIG. 1B, [A] source terminal (here, a predetermined bit array corresponding to the host 1 side); [B] Receiving terminal (here, for example, a predetermined bit array corresponding to the first terminal 2); [C] command format (here, a predetermined bit array corresponding to a communication-disabled command);
And [D] timer time (here, for example, 0.1
a predetermined bit array corresponding to mS); [3] Continuing with this, for the n-th terminal 4 (so that the analog switch 6 in the n-th terminal 4 is pushed to the A / D conversion unit 4E side for a certain period of time), the "analog switch" Issue a "set command". In response to this command, an analog switch control unit (not shown) in the nth terminal 4 operates, and the analog switch 6 is pushed down to the A / D conversion unit 4E side for a fixed time. [4] Thereafter, in the host 1, for example, the NTSC signal (corresponding to the required image data signal) stored in the large capacity memory 1A is sent out onto the (coaxial) LAN cable 5. [5] In the nth terminal 4, the attached A / D converter 4E
The side receives the NTSC signal, converts it into a digital signal corresponding to the NTSC signal, and stores image data for each predetermined unit in the frame memory 4F. The frame memory 4F here has at least two unit parts for storing digitized image data for each predetermined unit, and stores independent image data for each of the unit parts. Can be set. And this frame memory 4
The digital format image data stored in F is
It is converted into a corresponding analog signal in the D / A conversion function unit of the A conversion unit / oscillation unit 4G. The analog signal converted in this manner is brought into a predetermined oscillation state in the oscillation function section of the D / A conversion section / oscillation section 4G, and the nCRT
It will be displayed as a still image on (4A). (As will be understood from the above [2], the other first
The first CRT (2 corresponding to the terminal 2, the second terminal 3, ...
A), the second CRT (3A), ... Are turned off. ) [6] After a certain period of time, the initial state will be restored. For example, when the above-mentioned communication disable command is received, a predetermined communication disable time corresponding to a timer (not shown) in the corresponding terminal is set. Then, when the predetermined communication disabled time has elapsed, the analog switch 6 is returned to the original state to return to the initial state. In the above-described embodiment, the case where only the analog switch corresponding to a certain single terminal is tilted to the image data processing unit side has been described as an example, but the present invention is not limited to this, and a plurality of simultaneous switches are provided. The image data may be transmitted to the other terminals, and in such a case, the advantage that the same image can be shown to the person in charge of many terminals is brought. Further, the storage unit of the image data stored in the frame memory 4F to be used can be an arbitrary number, and individual image data can be stored independently in an arbitrary desired number of units. By setting it, various images can be quickly switched and taken out, and the convenience of the apparatus is improved accordingly.

[0011]

As described above, according to the image data receiving terminal device of the present invention, the data receiving section 4B for processing the digital data for data communication; the frame memory 4F and the D / A conversion. Section / oscillation section 4G; an image data control section 4C; and a digital function section mainly including an external data input section / display section 4D, and a corresponding digital conversion for image data transmitted in an analog state. A / D conversion unit 4E to perform: a frame memory 4F having at least two unit units for storing digitized image data in every predetermined unit; and a digital state selected from the side of the frame memory 4F. The corresponding analog conversion is applied to the image data,
It is characterized by including a D / A conversion unit / oscillation unit 4G for causing a predetermined oscillation so as to enable display in a stationary state. A remarkable effect is exhibited. That is, (1) it is possible to reduce the cost of the target system, and it is possible to provide an image data receiving terminal device having excellent so-called cost performance; (2) using an existing bus system as an underlay, The expandability can be reliably achieved; (3) the target system can be easily introduced, and its maintenance can be easily and reliably performed; (4) the so-called FA (Factory Aut)
In the field), it can be suitably used as a system for issuing an appropriate work instruction for each of a plurality of related processes; (5) Storage of image data stored in the used frame memory 4F. Since it is possible to have an arbitrary number of units, it is possible to quickly switch and retrieve various images by storing individual image data in an independent state in any desired number of units. (6) Since the D / A converter / oscillator 4G is provided, it is possible to deal with image data in a digital state selected from the side of the frame memory 4F. It becomes possible to perform a predetermined oscillation so that the display in the stationary state can be performed by analog conversion of the
As the T means, a commercially available inexpensive one may be prepared;

[Brief description of drawings]

FIG. 1 is a schematic diagram illustrating an image data LAN system to which an image data receiving terminal device according to an embodiment of the present invention is applied.

FIG. 2 is a block diagram showing an image data receiving terminal device of the above embodiment.

[Explanation of symbols]

6-Analog switch; 5-(coaxial) LAN cable; 4--nth terminal; 4A--nCRT; 4B-L
AN data receiving unit; 4C --- Image data receiving unit; 4D-
-External data input unit / display unit; 4E --- A / D conversion unit;
4F--frame memory; 4G--D / A converter / oscillator.

Claims (1)

[Claims] 1. A data receiving unit for processing digital data for data communication; an image data control unit for controlling a frame memory and a D / A conversion unit / oscillation unit; and an external data input unit / A digital function section mainly including a display section; and an A / D conversion section that performs corresponding digital conversion on image data transmitted in an analog state; digitized image data is stored at least in predetermined units. A frame memory having two unit parts; and for performing corresponding analog conversion on image data in a digital state selected from the frame memory side and causing a predetermined oscillation so as to enable display in a stationary state. And a D / A conversion unit / oscillation unit of the above.