The compression method of the video signal in digital form

 

(57) Abstract:

Usage: in digital television, in particular in devices for narrowing the bandwidth. The inventive transmitting device that provides compression of the video signal in digital form, contains the first, second and third delay lines, the frequency divider pulses, the first and second blocks subtraction freelance, inverter, first, second and third ADC, the first, second and third of the multiplication circuit, the fourth delay line, Thriller. The device reduces the redundancy of the information forming the reference signal and the signal interelement difference. 4 Il.

The invention relates to digital television (TV) and can be used in broadcast and applied TV systems for video compression in digital form.

There is a method of compressing a video signal in digital form, in which the LF signal (reference signal) and RF signal (the signal is a differential signal) are not formed in the frequency filtering of the analog signal, and arithmetic operations (subtraction) in digital form. Such systems are called systems with differential pulse code modulation (DICM).

The disadvantage of DICM taken for the a priori signal and the error signal are different amount of information, for example, 7 bits per element on the reference signal, and 2 bits/element on the error signal (difference signal).

The aim of the invention is to reduce the redundancy of information.

This objective is achieved in that the transmitted signal is delayed by the transmission time of one picture element, subtract from the direct video signal delayed video signal, encode the direct video signal in each of the fifth picture element in the full code, the encoded signal is a reference signal, to form the inter-element signal difference and encode it in every four picture elements through the fifth in an abbreviated code, when receiving a restore full code of all elements of the image by summing the reference signals with signals interelement difference, simultaneously with the formation of the reference signal and the inter-element signal-difference form the signal line of the differential path delay of the direct signal on one line and subtracted from the direct signal delayed code signal interelement difference in abbreviated code, the fifth element, form the signal of small parts of the image by summing the signals interelement and line differences, the small signal det in odd-numbered rows of the reference signals with signals interelement difference, and in even-numbered rows summarize the reference signals of the odd row signal line difference, restored the reference signals are also summed up in even rows with signals interelement difference.

The described method of compressing a video signal in digital form is illustrated in Fig. 1-4.

In Fig. 1 presents TV solution with orthogonal structure of the samples, in which circles tentatively identified elements of the transmitted reference signals, and the cross - differential. Fig. 1 explains the principle of signal transmission method of DICM (prototype); Fig. 2 presents the converted structure is odd (a) and even (b) fields of the television raster, illustrating the principle of video compression in digital form via the described method; (Fig. 1,2 the left of the specified raster line numbers corresponding to their location in the TV raster, and to the right of the numbering corresponding to the time of their sequence in the formation of an interlaced raster); Fig. 3 is a structural diagram of the transmitter (encoder) device that implements the method for compressing the video signal in digital form; Fig. 4 is a structural diagram of the receiver (decoder) device that implements the method for compressing the video signal in digital form.

Peregusna one element, a third delay line 3, the divider 4 frequency pulse 5, the first subtraction unit 5, the second block 6 subtraction, the inverter 7, the first analog-to-digital Converter 8 (ADC, the second ADC 9, the third ADC 10, the first circuit 11 logical multiplication, the fourth line 12 delay time of one line, the trigger 13, a second circuit 14 logical multiplication, the third circuit 15 logical multiplication, the fourth circuit 16 logical multiplication circuit 17 of a disjunction.

Receiving (decoding) device (see Fig. 4) contains the first scheme 1 logical multiplication, trigger 2, the second scheme 3 logical multiplication, the inverter 4, the first line 5 of the delay line, the third circuit 6 logical multiplication, the fourth scheme 7 logical multiplication of the first circuit 8 restore full code (MIC), the second circuit 9, the MIC, the circuit 10 of a disjunction, the third circuit 11, the MIC, the second line 12 delay lines, digital to analog Converter 13.

The input signal Ub/Carrives simultaneously on 3 channels (see Fig. 3). In the first channel converts the analog signal to digital, and pulse frequency of sampling (ID) and clock pulses (TI) 5 times less than expected. The output of analog-to-digital conversion max the Oia digital signals of even-numbered rows are the second and third channels. In the second channel using the delay line 1 and the subtraction unit 5 receives a signal line of the differential, which is then fed to the ADC 9. Here digital conversion is subjected only every fifth element. At the output of the ADC 9 received signals line difference in digital form, marked in Fig. 2 crosses in circles. The number of quantization levels can be taken in several times less than for the primary (reference) signal.

In the third receive channel signals interelement difference (blocks 2 and 6) and using the ADC 10 converts them into digital form, the number of quantization levels it also takes significantly less than for the reference signal.

When aligning digital streams in the channels of the frequency of clock pulses (T)'= T/5.

Next, the inter-element signal difference is delayed by one line delay line 12 and fed to the schema matches (logical multiplication) 16. The other two digital signal also serves on the logic circuits 14 and 15, which are controlled symmetrical rectangular pulses palustrine frequency. The output of block addition 17 received discrete signal VDSodd lines are transmitted 8-bit code, and the even - 2-Razi differences.

The decoding device (see Fig. 4) performs the reverse process of converting the signal from digital form to analog.

Discrete signal VDCusing blocks 1, 2, 3 is divided into two channel signals of odd rows (8-bit code) are fed to the delay line 5, where they are delayed by one line; the signals of even lines (differential signals) again are divided into two channels. Digital signals interelement difference output unit 6 are schematic restore the full code MIC 8 that receives delayed reference signals for signal conversion elements of the odd rows in 8-bit code.

The signals of the even rows are converted into 8-bit code in the following way. Allocated block 7, the signal line of difference between supporting elements in the schema MIC 9 is converted into signals with 8-bit code. In VPK 9 also receives discrete signals of the reference elements of neighboring rows. In addition to the signal line of the differential restores the contents of each of the fifth element. In block VPK 11 by summing signals from inter-element difference restores the contents of the intermediate elements of the even rows. From the output of block 11 8-bit what's and odd rows. Outputs of blocks 8 and 12 discrete signals through the logic summation 10 arrive at the d / a Converter DAC 13.

The application of this method allows to reduce the volume of the digital stream in the channel 4 times compared to PCM and 1.6 times in comparison with DICM (the quantization of the reference signals at 256 levels, in a differential - 4).

The COMPRESSION METHOD of the VIDEO signal IN DIGITAL FORM in a television channel, which consists in the fact that the transmitted signal is delayed by the transmission time of one picture element, subtract from the direct video signal delayed video signal, encode the direct video signal in each of the fifth picture element in the full code, the encoded signal is a reference signal, to form the inter-element signal difference and encode it in every four picture elements through the fifth in an abbreviated code, when receiving a restore full code of all elements of the image by summing the reference signals with signals interelement difference, characterized in that, in order to reduce redundancy of information during transmission simultaneously with the formation of the reference signal and the inter-element signal-difference form the signal line th, encode the signal interelement difference in abbreviated code, the fifth element, form the signal of small parts of the image by summing the signals interelement and line difference signal of small parts of the image are passed alternately with a reference signal, when receiving a generate signal in the full code, summed up in odd rows of the reference signals with signals interelement difference, and in even-numbered rows summarize the reference signals of the odd row signal line difference, restored the reference signals are also summed up in even rows with signals interelement difference.

 

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