SU1663777A1 - Coding and decoding device - Google Patents

Abstract

The invention relates to television technology. The purpose of the invention is to reduce the redundancy of transmitted information while maintaining the image quality. The device contains on the transmitting side of the ADC 1, block 2 of the brightness and color signals, subtractive block 3, quantizer 4, encoder 5 with variable length coding of the word, block 6 of the buffer memory, control unit (CU) 7, adder 8, block 9 prediction and unit 10 for estimating the signal of the displacement vector, and at the receiving side of the CU 11, block 12 of the buffer memory, decoder 13 with variable length decoding of the word, adder 14, block 15 for separating the capacitive and color signals, DAC 16, block 17 for prediction and block 18 for estimating motion vector signal. The goal is achieved by the introduction of the CU 7 and 11. With the C 7, a horizontal sync pulse is extracted from the full color analog video signal. Control signals are generated from it, synchronous and in-phase with the input signal, which are used to control the A / D converter 1, blocks 2, 6 and 10 and encoder 5. Using the CU 11 on the receiving side, the clock frequency is released and control signals are generated for blocks 12 , 15 and 16, decoder 13 and D / A converter 16. 2 ill.

Description

The invention relates to television technology and can be used in coding systems for television (TV) signals.

The aim of the invention is to reduce the redundancy of the transmitted information while maintaining the image quality

The drawing shows a block diagram of the device for encoding and decoding

The encoding and decoding device contains, on the transmitter side, an analog-to-digital converter (ADC) 1, a capacitance and color signal separation unit 2, a subtractor block, a quantizer 4, a variable-length encoder encoder 5, a buffer memory block 6, a transmitter control unit 7, an adder 8, a prediction block 9, a motion vector signal estimation block 10, and on the receiving side a control block 11, a buffer memory block 12, a decoO 13 variable length decoder

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Word, adder 14, block 15 of the brightness and color signals, digital-to-analog converter (DAC) 16, block 17 prediction, block 18 evaluation of the signal of the displacement vector.

The encoding and decoding device operates as follows.

The full color analog video signal is fed to the input of the A / D converter 1, where each sample is sampled and represented by an eight-bit binary number, as well as to the input of control unit 7, where the horizontal sync pulse is generated from the full analog video signal, from which the control signals are generated. - ronny and in-phase with the input signal. Then the digital signal from the output of the ADC 1 is fed to the input of separation unit 2, where the full color digital video signal is divided into brightness and color difference signals, and then according to control signals received from control unit 7, they are distributed over time. The digital signal from the output of separation unit 2 is fed to the first input of the subtractive unit 3, to the second input of which the predicted element value is obtained, taking into account the displacement vector, where the prediction error is calculated, which from the output of block 3 is fed to the input of the quantizer 4, which quantizes the error predictions by the Hoffman code presented in the table.

From the output of the quantizer 4, the quantized value of the prediction error is fed to the input of the encoder 5, where it is transcoding, and also fed to the feedback circuit to the first input of the adder; 8, the second input of which receives the predicted value of the signal from the output of prediction block 9, in which the element value is restored, which is fed as the first input of block 9, where the element value is predicted taking into account the displacement vector, which goes to the second the input of the subtracting unit and the second input of the adder 8, and the output of the evaluation unit 10, in which the estimate of the signal of the displacement vector of the element and the corresponding interframe difference, which is fed to the second input of the block 9, is predicted one, to the control input of which a control signal is supplied from the second output of the evaluation unit 10. From the output of the encoder 5, the information is fed to the input of block 6, where the recording occurs at the sampling frequency from block 7, and then reads this information at the desired speed. During the overflow

Neither block 6 from its second output is given the command to the second input of the quantizer 4 to select the appropriate quantization scale (coarser). From the output of block 6, the information enters the communication channel.

At the receiving side, from the communication channel, information is fed to control unit 11, where clock frequency selection and control signal generation occurs and is recorded in buffer storage unit 12, where the signal is read at the sampling frequency (input from block 11 and input to decoder 13). where the signal is decoded using the Hofman code. From the output of the decoder 13, the decoded value of the prediction error is fed to the first input of the adder 14, to the second input of which the predicted value of the element from the output unit 17, and the output is the reconstructed, signal value, which is fed to the input of separation unit 15, where the merging of the brightness and color difference signals occurs.

From the output of the separation unit 15, a full color digital signal is fed to the input of the DAC 16, where the digital signal is converted into a full analogue TV signal. From the output of the adder 14, the recovered element is also fed to the input of the evaluation unit 18, where the estimate of the displacement vector and the corresponding minimum interframe difference are calculated, which is fed to the second input 17 of the unit, the control input of which is connected to the second output of the evaluation unit 18.

Claims (1)

Claims A television signal encoding and decoding device comprising a serially connected analog-to-digital converter, a capacitance and color signal separation unit, a subtracting unit, a quantizer, an encoder and a variable word length coding and a buffer memory block, the first output of which is connected with the second input of the quantizer, the motion vector signal evaluation unit, the adder, the first input of which is connected to the output of the quantizer, the prediction unit, the first input of which is one with the output of the adder, the second and third inputs with the outputs of the motion vector signal evaluation unit, the output of which is with the second inputs of the adder and the subtraction unit, the input of the analog-digital converter is the transmitter input, the serially connected buffer memory block, the decoder on the receiving side variable word length signal, adder, luminance and color signal separation unit and digital-to-analog converter, prediction unit, the first input of which is connected to the output of the adder, and the output - to the second inputs Adder, characterized in that, in order to reduce redundant information while preserving the image quality, a control unit (CU) is inserted on the transmitting side, the input of the motion vector signal evaluation unit is connected to the output of the adder, and the first output of the vector signal evaluation unit displacement - with the second input of the prediction unit, and the second output of the displacement vector signal evaluation unit - with the control input of the prediction block, the CU input is connected to the receiver input, and 0 five the outputs — with the second inputs of the analog-digital converter, the luminance and color signals separation unit, the motion vector signal evaluation unit, the variable-length encoder word encoder, and the buffer memory unit — are entered at the receiving side. the input of the motion vector signal evaluation unit is connected to the output of the adder, and the first output is connected to the second input of the prediction block, and the second output is connected to the control input of the prediction block, the control unit input is connected to the input of the buffer memory block, and the outputs are connected to the second inputs of the decoder signal c variable-length words, blocks of buffer memory, separation of luminance and color signals, and a digital-to-analog converter.