RU2131172C1 - Interpolation method for compressing tv signal - Google Patents

Abstract

FIELD: TV equipment. SUBSTANCE: high redundancy of TV signal provides possibility of high-precision recovery of signal fragments which have been lost under influence of interference or faults in transmitting chips. These recovery mechanisms are disclosed in patents of various manufacturers. This invention provides artificial removal of fragments of line signals and their recovery using interpolation of fragments of transmitted lines in order to reduce redundancy of TV signal. EFFECT: decreased bandwidth for transmission of TV signal. 3 dwg

Description

 Interpolation has found relatively wide application in television technology to recover signal fragments lost due to interference or malfunction. The high redundancy of the television signal allows the use of interpolation to compress the television signal by artificially excluding fragments of lines on the transmitting side and restoring them on the receiving side. The prototype for the invention can be the invention according to patent N 5/392/070 with priority dated 02.21.1995, issued in the USA to Yukio Endo and co-authors under the name "Device for correcting pixel signal losses by replacing them with normal pixel signals."

 This patent proposes to replace the damaged parts of the lines due to the malfunction of some line pixels in the transmitting chip by using the signals of the good pixels of this line and adjacent lines.

 The invention proposes to exclude part of the line signals on the transmitting side and thus reduce the digital stream of the television signal necessary for its transmission or storage. On the receiving side, it is proposed to recover the signals of excluded parts of the lines by interpolation from the non-excluded parts of the string and adjacent non-excluded parts of the lines in the frame.

 This process is illustrated in FIG. 1, which shows three lines from a frame, indicated by 1, 2, 3. Rectangles denote the non-excluded parts of the lines, and the line denotes the excluded parts of the lines. FIG. 1 shows the arrangement of lines in a frame on the transmitting side and the restored arrangement of the same elements on the receiving side. Using interpolation, for example, the signal recovery of the excluded part of line 3.2 will be restored to the non-excluded numbers 2.2, 4.2, 3.1 and 3.3, which is indicated by arrows for convenience. In FIG. 1, for simplicity, three lines are shown that are involved in interpolation, but this was not done to limit the order of interpolation, but to provide understanding.

In FIG. 2 shows a structural diagram of the device of the transmitting side, in which are indicated:
1 - a signal conditioning apparatus in which parts of the signal lines are removed;
2 - a device for storing non-excluded parts of strings;
3 - coding device;
In FIG. 3 shows a structural diagram of the receiving part of the device, in which are indicated:
1 - a device for decoding and allocation of clock pulses;
2 - a recovery device in which there is a restoration of the location of non-excluded line items in the frame lines;
3 is an addition device in which a line is formed from a sequence of non-excluded parts of lines obtained as a result of interpolation;
4 - a device for generating a television signal;
5 - a clock generator;
6 - drive and line shaper;
7 is an interpolation device that restores the signals of excluded parts of lines.

 The proposed structural schemes operate as follows: on the transmitting side in the device of FIG. 2, the input signal enters the element of circuit 1, in which the line parts are removed from the signal, the remaining parts of the lines are sent to the accumulator of non-excluded parts of the string, as a result of which a continuous signal consisting of non-excluded parts of the strings can be generated. The signal from the output of the drive 2 enters the formation device, in which a signal is formed suitable for transmission to a communication channel or for storage. The receiving part shown in FIG. 3, operates as follows: the input signal is sent to block 1, in which the received signal is decoded, the signals of non-excluded parts of the lines and synchronization signals are extracted, the output signals of block 1 are sent to the input of block 2 - a device for restoring the location in the line and frame of excluded and non-excluded elements lines, the output signal of block 2 is fed to the input of block 3, in which the blanks in the line are filled with line elements restored as a result of interpolation. In block 5 is the selection and formation of control signals of the action of blocks 2, 3, 4, 6, 7.

 In the structural diagrams of the transmitter of FIG. 2 and the receiver of FIG. 3, some auxiliary devices for matching the action time, phasing, and the like are omitted.

 The contents of circuits 2, 3 can be implemented in the current state of microcircuit circuitry. In this case, there may be changes in the content and arrangement of blocks in structural diagrams without changing the principle of the compression method in the patented invention.

Claims (1)

 An interpolation method for compressing a television signal during its line-by-line transmission, consisting in the fact that some parts of the transmitted lines are excluded on the transmitting side, characterized in that some of their parts are excluded from the lines on the transmitting side in such a way that in each frame the parts are not excluded by the location coincide with the excluded parts of adjacent lines, and the fact that the location of excluded and non-excluded lines is restored on the receiving side in the frame, which coincides with that in this frame re on the transmitting side, and the fact that excluded parts of lines are restored by interpolation using non-excluded parts of a given line and non-excluded parts of adjacent lines.

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