JPH01286689A - Multipoint picture transmitting system - Google Patents

Abstract

PURPOSE:To correct the turbulence of a received picture in a short time when the connection between a transmitting part and a receiving part is switched by freely using the respective transmitting parts and receiving parts of high-efficiency picture encoding devices provided for plural spots for the transmission and reception with the respective separate other party sides. CONSTITUTION:High-efficiency picture encoding devices 1-3 are provided for respective spots A-C, the respective high-efficiency picture encoding devices 1-3 are equipped with transmitting parts 11, 21 and 31 and receiving parts 12, 22 and 32 and the outputs of the respective transmitting parts can be freely connected to the inputs of the respective receiving parts by a switching part 4. Further, refresh requesting signals a1-c1 from the respective receiving parts 12, 22 and 32 are given to the respective transmitting parts 11, 21 amd 31 by giving an adding function to respective change-over adding parts 5 and freely connecting the parts 5 to the respective transmitting parts 11, 21 and 31. Moreover, a control part 6 makes the switching part 4 and the adding part 5 correspond to each other, controls the switching part 4 and the adding part 5, and composes the transmission line between the transmitting part to transmit a high-efficiency encoding picture signal and the receiving part. Further, the control part 6 sends refresh requesting signals 62-64 when the control part 65 makes the switching part 4 execute a switching operation and forcibly makes the corresponding transmitting part execute a refreshing operation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention provides high efficiency encoded image signals (hereinafter referred to as T
This relates to a method for transmitting (ECM).

[Conventional technology]

FIG. 2 is a block diagram of a conventional example, in which the HECV-81
, S2, and each device 1, 2
T (ECV-81,
S2 is received as received signals R1 and R2 by the receiving section 12.2 of each device 1.2, where it is decoded and the received image is displayed.

For example, if a noise component e is added to the HECV-81 due to a momentary interruption of the transmission path or a transmission error,
The image received by the receiving unit 22 is disturbed in response to the occurrence of an abnormality in the reception signal R2, and this state continues thereafter, so the following countermeasures are adopted.

That is, when the receiving unit 22 sends out a refresh request signal (hereinafter referred to as RFRQ) bl in response to disturbances in the received image, and the transmitting unit 21 multiplexes this signal and transmits it together with HECV-82, the receiving unit 12 receives the RFRQ・bl. separate,
In order to give this to the transmitting section 11 as a refresh control signal (hereinafter referred to as RPCT) al, the transmitting section 11 transmits the initial value of 1 (ECV-81) in accordance with this, thereby converting the received image of the receiving section 22 into a regular one. It is being restored to.

Note that when a disturbance occurs in the received image in the receiving section 12, RFRQ-11 is sent from the intermediary section 12, multiplexed and transmitted in the transmitting section 11, and then transmitted to the receiving section 2.
HFCT-b2 is provided to the transmitting section 21 through reception separation by 2, and a similar refresh operation is performed.

In addition, as another method, the RF from the receiving section 12.22
CT-a2. Regardless of b2, the transmitter 11.21 is also periodically refreshed.

[Problem to be solved by the invention]

However, in the past, RFR was
Q is multiplexed with HFCV and transmitted, and the transmitting section and receiving section of the device must be installed opposite each other, and the transmitting section and receiving section are used for transmission and reception of the north α with each individual partner. This has resulted in drawbacks that make it unusable.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention is configured by the following means.

That is, a high-efficiency image encoding device disposed at each of a plurality of points, each having a transmitting section and a receiving section, a switching section that freely connects the transmitting section output and the receiving section input of each of these devices, The RFRQ sent from the receiving section of each device is freely connected and given to the transmitting section of each device, and the switching adding section has a signal addition function, and the connection status of the switching section and switching adding section is controlled in correspondence with each other. The system is equipped with a control section that controls the

[Effect]

Therefore, the transmitting section output and the receiving section input of each device are freely connected by the switching section, and as a result, HECV transmission is performed individually, and correspondingly, the RFRQ from each receiving section is transmitted to the other side. Since the switching and adding section has an addition function, even when the same transmitting section output is connected to multiple receiving section inputs, the RFRQ from each receiving section is They can be added and given to the same transmitter.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to the block diagram of FIG. 1 showing an embodiment.

In the figure, high-efficiency image encoding devices 1 to 3 are arranged at each of points A, B, and C, and each of these has a transmitter 11, 21, 31 and a receiver 12, 22, 32.
The output of each transmitting section 11, 21, 31 can be freely connected to the input of each receiving section 12, 22, 32 by the cross points arranged in a matrix of the switching section 4. There is.

In addition, RFEQ・ml from each receiving section 12, 22.32
, bl, and cj are provided by each of the switching and adding sections 5 having an addition function and being freely connected to the respective transmitting sections 11, 21, and 31 through cross points configured in a matrix. The control section 6 controls the switching section 4 and the switching addition section 5 in correspondence with each other using a control signal 61, thereby configuring a transmission path between the transmitting section and the receiving section for transmitting HECV. When the switching operation is performed, R
FEQs 52 to 64 are sent out to force the corresponding transmitter to perform a refresh operation.

Therefore, for example, the cross point of the switching unit 4) 4-
1-2.4-1-3.4-2-1 and turn on,
Cross point 5-1-2.5-1-3 of switching addition section 5
By turning on ゜5-2-1, the HECV-f91 from the transmitting section 11 is sent to the receiving section 22.32 via the input INl and the output 0UT2.3 of the switching section 4.
2,R3,! : and Hmcv-sl can be simultaneously received at the receiving section 22.32, and the HECV-82 from the transmitting section 21 is sent to the receiving section via the input IN2 and output OUT1 of the switching section 4. As a result, the transmission paths between the transmitting section 11 and the receiving sections 22 and 32 and between the transmitting section 21 and the receiving section 12 are simultaneously configured.

Further, RFRQ 62 to 64 are sent to each transmitting unit If, 21.31 via the switching adder 5, and RFCT-&2. b2. C2
After starting the transmission of TECV-81 to S3 (after they perform a refresh operation), the HE
In correspondence with the transmission paths of CV-S 1 to S3, the receiving section 2
RFRQ-bl and cl from 2.32 are added by logical sum via the inputs IN2 and 3 and the output OUT1 of the switching adder 5 and given to the transmitter 11 as RFCT-a 2, and the RFRQ-bl and cl from the receiver 12 are RFRQ-11 is given to the transmitter 21 as RFCT-b2 via the input IN1 and output OUT2 of the switching adder 5, so that RFRQ-&1. b1.
Each transmission path of C1 is also configured.

For this reason, the transmitter 11.21.31 and the receiver 12.22
．． The disturbance in the received image that occurs when switching the connection between
The transmission of RFEQs 62 to 64 can be corrected in a short time, and the connection between the switching section 4 and the switching addition section 5 can be made easily.
32 for transmission and reception with each individual party.

The number of points A to C is determined depending on the situation, and the number of inputs and outputs of the switching section 4 and the switching addition section 5 may be determined accordingly.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, each transmitting section and receiving section of a highly efficient image encoding device installed at multiple points can be freely used for transmitting and receiving with each individual partner, Remarkable effects can be obtained in the transmission of high-efficiency coded image signals.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional example. 1 to 3... High efficiency image encoding device, 4... Switching unit, 5... Switching addition unit, 6... Control unit, 11,
21.31... Transmission section, 12°22.32...
Receiving section, A-C...points, 81-S3...
High efficiency encoded image signals, al, bj. cl...Refresh request signal.

Claims (1)

[Claims] a high-efficiency image encoding device disposed at each of a plurality of points, each of which has a transmitting section and a receiving section; a switching section that freely connects the transmitting section output and the receiving section input of each of the devices; A switching addition section having a function of adding signals while freely connecting and giving a refresh request signal sent from a reception section of the device to a transmission section of each of the devices, and a connection status of the switching section and switching addition section corresponding to each other. A multi-point image transmission method characterized by comprising a control unit that controls the image.