JPH0846958A - Edtv picture encoding device - Google Patents

Abstract

PURPOSE:To reduce deterioration in picture quality with encoding and also to enable high efficient encoding with a sufficient compression effect by code- encoding an identification control signal, encoding a vertical reinforcing signal only as against an important signal component and encoding a main signal as in the conventional manner. CONSTITUTION:A composite color TV signal EDTV is inputted to an AD converting part 1, sampled by a frequency four times as large as the color subcarrier wave fsc and converted into a digital signal. In a separating part 2, separation is executed into the identification control signal ED which is added to the specified scanning line of a vertical blanking period, the vertical reinforcing signal HV of a non-picture part area and the main signal MS of a main picture part area. The main signal MS is inputted to a main signal pre-processing part 7 to execute a format conversion processing and generate an encoding main signal MSC. In a time division multiplexing part 9, first-third encoding data signals C1, C2 and C3 are multiplexed to generate an encoding picture data group C4 and a channel encoding part 10 adds an error-correcting code to generate a transmission data signal CD.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image coding apparatus for transmitting and receiving a television signal by compressing the amount of information by high efficiency coding, and more particularly to an image suitable for a letterbox type EDTV system television signal. The present invention relates to an encoding device.

[0002]

2. Description of the Related Art Research and development of a next-generation television system (EDTV system), which has compatibility with the current television system (NTSC system) and realizes high image quality, high definition, and wide screen of television images. Is being promoted.

In the EDTV system, various types such as a side panel type, a letterbox type, and an intermediate mode type have been devised so far. Among them, the letterbox type is promising as a next-generation television system because it is excellent in both compatibility with a transmission line and compatibility with a receiver.

In the letterbox type EDTV system, an image having a horizontally long aspect ratio (16: 9), which is different from the aspect ratio 4: 3 of the current television system, is provided in a main image area in which a non-image area is provided above and below the screen. It is placed in and transmitted and received. And
In the non-picture area and the main picture area above and below the screen, the luminance vertical high-frequency component and the luminance horizontal high-frequency component are suspended as reinforcement signals to realize high image quality and high definition. Also, information necessary for demodulation processing on the EDTV receiver side is added as an identification control signal.

In the field of material transmission, television signals are digitally transmitted in order to transmit high quality images. However, if the digitized signal is transmitted as it is, the amount of information becomes enormous. Therefore, the amount of information is compressed to several tens of Mbps by high-efficiency coding and then transmitted. Then, an image coding apparatus for highly efficient coding of an NTSC television signal has been developed, and SN
It is operated by G etc. However, when the broadcasting by the letter box type EDTV system is started, an image encoding device for highly efficient encoding the television signal of this system is required.

[0006]

[Problems to be Solved by the Invention] Letterbox type ED
Since the TV system is compatible with the NTSC system, it is possible to use the conventional NTSC system image encoding device as it is. However, letterbox type EDT
The V system is completely different from the image signal of the NTSC system,
Identification control signals and reinforcement signals are newly added. Then, the image signal and these new signals are significantly different in the degree of image quality deterioration due to encoding. Therefore, in the conventional image encoding apparatus that encodes these new signals in the same manner as the image signal, there is a problem that the image quality is significantly deteriorated due to the encoding and the image quality is significantly deteriorated.

An object of the present invention is to solve the above problems,
An object of the present invention is to provide an image encoding device for a television signal of a letterbox type EDTV system that transmits a high quality image.

[0008]

In order to achieve the above object, the present invention provides a letterbox type EDTV system television signal, an identification control signal, and a vertical reinforcement signal for the upper and lower non-image areas of the screen. A means for separating the signal into the main signal of the image area is provided. In addition, for the separated identification control signal, vertical reinforcement signal, and main signal,
A means for performing high-efficiency coding in a form adapted to the characteristics of the signal is provided.

Further, in encoding the vertical reinforcement signal, two types of means, that is, collective encoding or separate encoding, are provided.

Further, the identification control signal and the vertical reinforcement signal are
Compared with the main signal, a means for code error protection with better error resistance is provided.

In addition, the letter box type EDTV system and N
A means of a system discrimination function from the TSC system is provided.

[0012]

The signal separating means in the present invention can separate the signal into the discrimination control signal, the vertical reinforcement signal, and the main signal having different signal properties. Then, in the high-efficiency coding means, coding adapted to the characteristics of each signal is performed, that is, the identification control signal is code-coded, the vertical reinforcement signal is a code that finely quantizes important signal components, and the main signal is By performing the same encoding as the conventional technique, the deterioration of the image quality due to the encoding is extremely small, and the highly efficient encoding having the excellent compression efficiency can be performed.

Further, in the encoding of the vertical reinforcement signal, it is possible to select a means for collective encoding suitable for intra-frame encoding or separate encoding suitable for intra-frame and inter-frame encoding according to the transmission bit rate. It becomes possible to cope with encoding at various rates.

Further, by providing a code error protection means having an excellent error resistance characteristic with respect to the identification control signal and the vertical reinforcement signal in which the code error in the transmission line causes the remarkable deterioration of the image quality, the influence of the code error is provided. Can be significantly reduced.

Also, by means of the system discrimination function, NTS
It is possible to realize an encoding device capable of transmitting both the C system and the letterbox type EDTV system with high quality video.

[0016]

FIG. 1 is an overall block diagram of the first embodiment of the present invention, which is suitable for highly efficient coding of a main signal in a main picture area of a letterbox type EDTV system by composite direct coding. It is a thing.

In the encoding section of FIG. 1A, a letter box type EDTV system composite color television signal EDT is used.
V is input to the AD conversion unit 1, is sampled at a frequency four times as high as the color subcarrier f _SC , and is converted into a digital signal. Then, in the separation unit 2, the identification control signal ED added to the specific scanning line in the vertical blanking period, the vertical reinforcement signal HV in the upper and lower non-image area of the screen, and the main signal MS in the main image area. To separate.

The identification control signal ED is supplied to the identification signal preprocessor 3
The EDP is extracted from the identification information signal, and the encoding unit 4 performs the encoding process to generate the first encoded data signal C1.

The vertical reinforcement signal HV is supplied to the reinforcement signal preprocessor 5
To the encoded supplementary signal HVC. Then, the reinforcement signal encoding unit 6 performs an encoding process for finely quantizing a signal component important for improving the vertical resolution, and generates a second encoded data signal C2. The details will be described later.

On the other hand, the main signal MS is input to the main signal pre-processing unit 7 and subjected to format conversion processing to generate a coded main signal MSC. Then, in the main signal encoding unit 8,
For example, the same Hadamard transform coding and entropy coding in the frame, the same coding process as the conventional technique is performed,
The third encoded data signal C3 is generated.

The time division multiplexing section 9 time-divisionally multiplexes the first to third coded data signals C1, C2 and C3 to generate a coded image data series C4. Then, the channel coding unit 10 performs a process of adding a code for error correction to generate a transmission data signal CD.

In the decoding unit shown in FIG. 3B, the channel decoding unit 11 performs a code error correction process on the transmission data signal CD to decode the coded image data sequence C4.
Then, the time division separation unit 12 performs the first division by the time division separation processing.
Coded data signal C1 and second coded data signal C
2 and the third encoded data signal C3.

The first encoded data signal C1 is decoded by the decoding unit 13 into the identification information signal EDP, and the identification signal demodulation unit 1
At 4, the identification control signal ED is demodulated based on this signal.

The second coded data signal C2 is decoded by the reinforcing signal decoding unit 15 to decode the coded reinforcing signal HVC,
The reinforcement signal demodulation unit 16 performs format conversion and time series shift processing to demodulate the vertical reinforcement signal HV.

On the other hand, for the third coded data signal C3, the main signal decoding unit 17 decodes the coded image signal MSC, and the main signal demodulation unit 18 performs format conversion processing.
Demodulate the main signal MS.

In the multiplexing section 19, the identification control signal ED, the vertical reinforcement signal HV, and the main signal MS are respectively supplied to a specific scanning line in a predetermined vertical blanking period, a non-image area above and below the screen, and a main image area. To synthesize during the period. Then, the DA converter 20 adds a predetermined synchronization signal or burst signal, performs analog conversion, and demodulates the composite color television signal EDTV of the letterbox type EDTV system.

Next, regarding the second embodiment of the present invention,
This will be described with reference to the overall block diagram of FIG. This is suitable for performing code error protection processing on the encoded data of the identification control signal and the vertical reinforcement signal. The main signal in the main picture area is subjected to high-efficiency coding by composite direct coding.

In the encoding section shown in FIG. 9A, a letterbox type EDTV system composite color television signal E is used.
The DTV is input to the AD conversion unit 1, and the color subcarrier f _SC
Sampling at double frequency and converting to digital signal.
The separation unit 2 separates into an identification control signal ED added to a specific scanning line in the vertical blanking period, a vertical reinforcement signal HV in the upper and lower non-image area of the screen, and a main signal MS in the main image area. To do.

The identification control signal ED is supplied to the identification signal preprocessor 3
The identification information signal EDP is extracted by and the encoding processing is performed by the encoding unit 4 to generate the first encoded data signal C1.

The vertical reinforcement signal HV is supplied to the reinforcement signal preprocessor 5
To the encoded supplementary signal HVC by performing time series shift and format conversion processing. The reinforcement signal encoding unit 6 performs an encoding process for finely quantizing the signal component that plays an important role in improving the vertical resolution, and generates a second encoded data signal C2.

The ECC adding section 21 time-divisionally multiplexes these coded data signals, adds an error correction code,
An encoded data signal C5 that has been subjected to a code error protection measure is generated.

On the other hand, the main signal MS is input to the main signal pre-processing section 7 and subjected to format conversion processing to generate a coded main signal MSC. The main signal coding unit 8 performs the same high-efficiency coding processing as in the conventional technique, for example, Hadamard transform coding and entropy coding in a frame, and generates a third coded data signal C3.

In the time division multiplexer 9, the encoded data signal C
5 and the third coded data signal C3 are time-division multiplexed to generate a coded image data series C4. Then, the channel coding unit 10 adds a code for error correction,
Generate a transmission data signal CD.

In the decoding section shown in FIG. 3B, the channel decoding section 11 performs a correction process for a code error included in the transmission data signal CD and decodes the coded image data series C4. The time division separation unit 12 performs a time division separation process to separate the encoded data signal C5 and the third encoded data signal C3.

The ECC correction unit 22 corrects the remaining code errors that cannot be corrected by the correction processing in the channel decoding unit, separates them into time division, and outputs the first encoded data signal C1.
And the second encoded data signal C2.

The first encoded data signal C1 is decoded by the decoding unit 13 into the identification information signal EDP, and the identification signal demodulation unit 1
At 4, the identification control signal ED is demodulated based on this signal.

The second coded data signal C2 is decoded by the reinforcing signal decoding unit 15 into the coded reinforcing signal HVC,
The reinforcement signal demodulation unit 16 performs format conversion and time series shift processing to demodulate the vertical reinforcement signal HV.

On the other hand, for the third coded data signal C3, the main signal conversion section 17 decodes the coded image signal MSC, and the main signal demodulation section 18 performs format conversion processing to demodulate the main signal MS.

In the multiplexing unit 19, the identification control signal ED, the vertical reinforcement signal HV, and the main signal MS are respectively given to a specific scanning line in the vertical blanking period, a non-image area above and below the screen, and a main image area. Synthesize in a period. Then, the DA converter 2
At 0, a predetermined sync signal or burst signal is added and analog conversion processing is performed to demodulate the letterbox type EDTV system composite color television signal EDTV.

Next, regarding the third embodiment of the present invention,
This will be described with reference to the overall block diagram of FIG. This is suitable for highly efficient coding of both the television signal of the letterbox type EDTV system and the NTSC system.
The image portion is encoded by composite direct encoding.

In the encoding section shown in FIG. 9A, the composite color television signal VS is input to the AD conversion section 1 and the system discrimination section 23. The AD converter 1 samples at a frequency four times as high as the color subcarrier f _SC and converts it into a digital signal. Further, the system discriminating unit 23 discriminates the letter box type EDTV system when there is an identification control signal on a predetermined scanning line and the NTSC system when there is no discrimination control signal, and produces the system identification information TVM. The switches 24 and 25 are connected to the terminal a in the letterbox EDTV system and the terminal b in the NTSC system.
To perform encoding processing.

In the separating unit 2, a letterbox type EDTV is used.
Control signal ED added to a specific scan line in the vertical blanking period of the composite color television signal of the standard
And the vertical reinforcement signal HV in the upper and lower non-picture area of the screen and the main signal MS in the main picture area.

The identification control signal ED is supplied to the identification signal preprocessor 3
The identification information signal EDP is extracted by and the encoding processing is performed by the encoding unit 4 to generate the first encoded data signal C1.

The vertical reinforcement signal HV is supplied to the reinforcement signal preprocessor 5
To the encoded supplementary signal HVC. The reinforcement signal encoding unit 6 performs an encoding process for finely quantizing the signal component that plays an important role in improving the vertical resolution, and generates a second encoded data signal C2.

On the other hand, the output signal of the switch 24, the main signal MS of the letterbox type EDTV system, or the NTSC.
The system composite color television signal is input to the main signal preprocessing unit 7, where it is subjected to format conversion processing to generate an encoded main signal MSC. The main signal encoding unit 8 performs the same high-efficiency encoding processing as in the conventional technique, for example, Hadamard transform encoding and entropy encoding in a frame, and generates a third encoded data signal C3.

The time division multiplexing unit 9 time-divisionally multiplexes the first, second and third encoded data signals to generate a letterbox type EDTV system encoded image data sequence C6.
In addition, a system code representing the letterbox EDTV system is also multiplexed.

The switch 25 is a letterbox type ED.
The coded image data series C6 of the TV system and the third coded data signal C3 corresponding to the coded image data series of the NTSC system are selected and output according to the system, and the coded image data is output. Generate the sequence C4. Then, the channel coding unit 10 adds an error correction code to generate the transmission data signal CD.

In the decoding section shown in FIG. 9B, the channel decoding section 11 performs a correction process for the code error contained in the transmission data signal CD and decodes the coded image data series C4. Then, the system code discrimination unit 26 discriminates between the letterbox type EDTV system and the NTSC system based on the system code, and generates the system identification information TVM. With this information, the switches 27 and 28 are letterbox type E.
Decoding processing is performed by connecting to terminal a in the DTV system and terminal b in the NTSC system.

In the time division separation unit 12, the first coded data signal C1 of the letterbox type EDTV system, the second coded data signal C2, and the third coded data signal C3.
And separate.

The first encoded data signal C1 is decoded by the decoding unit 13 into the identification information signal EDP, and the identification signal demodulation unit 1
At 4, the identification control signal ED is demodulated based on this signal.

The second coded data signal C2 is decoded by the reinforcing signal decoding unit 15 into the coded reinforcing signal HVC,
The reinforcement signal demodulation unit 16 performs format conversion and time series shift processing to demodulate the vertical reinforcement signal HV.

On the other hand, the coded data signal of the letterbox type EDTV system main signal or the NTSC system image signal of the output signal of the switch 27 is processed by the main signal decoding unit 1.
At 7, the encoded image signal MSC is decoded. Then, the main signal demodulation unit 18 performs format conversion processing to demodulate the main signal MS.

In the multiplexing unit 19, the identification control signal ED, the vertical reinforcement signal HV, and the main signal MS are respectively supplied to a specific scanning line in the vertical blanking period, a non-image area above and below the screen, and a main image area. To generate a letterbox type EDTV system signal. Then, the DA box 20 selects the letterbox EDTV or NTSC signal selected by the switch 28, adds a predetermined synchronizing signal or burst signal, and performs analog conversion to demodulate the composite color television signal VS. To do.

According to the above-described first to third embodiments, the image coding apparatus for directly composite-coding a letterbox type EDTV television signal deteriorates image quality due to coding. Can be realized with characteristics that the amount of information is extremely small and the compression efficiency of the amount of information is high.

Next, an image coding apparatus for component-coding an image signal will be described with reference to the embodiments shown in FIGS.

FIG. 4 is an overall block diagram of the fourth embodiment of the present invention.

In the encoding section shown in FIG. 6A, a letterbox type EDTV system composite color television signal E is used.
In the DTV, the AD conversion unit 1 samples at a frequency four times as high as the color subcarrier f _SC and converts it into a digital signal. And
The separation unit 2 separates into an identification control signal ED added to a specific scanning line in the vertical blanking period, a vertical reinforcement signal HV in the upper and lower non-image area of the screen, and a main signal MS in the main image area. To do.

The identification control signal ED is supplied to the identification signal preprocessor 3
The identification information signal EDP is extracted by and the encoding processing is performed by the encoding unit 4 to generate the first encoded data signal C1.

The vertical reinforcement signal HV is supplied to the reinforcement signal preprocessor 5
The time-series shift format conversion processing is performed to generate the coded reinforcement signal HVC. The reinforcement signal encoding unit 6 performs encoding processing for finely quantizing the signal component that plays an important role in improving the vertical resolution, and the main signal MS that generates the second encoded data signal C2 is the YC separation unit 29. Motion-adaptive three-dimensional separation processing is performed with the luminance low-frequency signal YL and the carrier color signal C.
And the horizontal reinforcement signal HH. Then, the color demodulation unit 30 performs synchronous detection using the color subcarrier f _SC to demodulate the color difference signals C _B and C _R. Further, the HH demodulation unit 31 demodulates the luminance horizontal high-frequency component YH by the synchronous detection process. Then, the adder 32 demodulates the luminance signal Y by adding it to the luminance low-frequency signal YL.

In the main signal preprocessor 33, for example, CCIT
The video encoding of T recommendation H.261 or the conversion processing to the image format of the encoding based on the moving image encoding standard MPEG for storage media is performed to generate the component encoded image signal CVS. Then, the main signal encoding unit 34 performs motion compensation DCT encoding and entropy encoding processing to generate a third encoded data signal C7.

The time division multiplexing unit 9 time-divisionally multiplexes the first, second and third encoded data signals to generate an encoded image data series C4. Then, the channel coding unit 10 adds an error correction code and generates the transmission data signal CD.

In the decoding section shown in FIG. 9B, the channel decoding section 11 corrects the code error contained in the transmission data signal CD and decodes the coded image data series C4. Then, in the time division separation unit 12, the first coded data signal C1, the second coded data signal C2, and the third coded data signal C2.
The encoded data signal C7 of is separated.

The first encoded data signal C1 is decoded by the encoding section 13 into the identification information signal EDP, and the identification signal demodulation section 1 is obtained.
At 4, the identification control signal ED is demodulated based on this signal.

The second coded data signal C2 is decoded by the reinforcing signal decoding unit 15 into the coded reinforcing signal HVC,
The reinforcement signal demodulation unit 16 performs format conversion and time series shift processing to demodulate the vertical reinforcement signal HV.

On the other hand, the third coded data signal C7 is processed by the main signal decoding unit 35 as the component coded image signal CV.
Decrypt S. Performs conversion of image format in the main signal demodulation unit 36 demodulates the luminance low-band signal YL, luminance horizontal high-frequency component YH, the color difference signals C _B, the C _R. HH modulator 3
In 7, the horizontal reinforcement signal HH is generated by the frequency shift processing by the carrier suppression amplitude modulation. The color modulator 38 orthogonally modulates the color difference signal with the color subcarrier f _SC to generate the carrier color signal C. Then, the adder 39 adds these signals to demodulate the main signal MS.

In the multiplexing unit 19, the identification control signal ED, the vertical reinforcement signal HV, and the main signal MS are respectively supplied to a specific scanning line in the vertical blanking period, the upper and lower non-image areas of the screen, and the main image area. To synthesize. Then, the DA converter 20 performs addition of a predetermined synchronizing signal or burst signal and analog conversion processing to demodulate the letterbox type EDTV system composite color television signal EDTV.

Next, FIG. 5 is an overall block diagram of the fifth embodiment of the present invention, which is suitable for performing code error protection processing on the encoded data of the identification control signal and the vertical reinforcement signal. .

In the encoding section shown in FIG. 9A, a letterbox type EDTV system composite color television signal E is used.
In the DTV, the AD conversion unit 1 samples at a frequency four times as high as the color subcarrier f _SC and converts it into a digital signal. Separation part 2
Then, the identification control signal ED added to a specific scanning line in the vertical blanking period, the vertical reinforcement signal HV in the upper and lower non-image area of the screen, and the main signal MS in the main image area are separated.

The identification control signal ED is supplied to the identification signal preprocessor 3
The identification information signal EDP is extracted by and the encoding processing is performed by the encoding unit 4 to generate the first encoded data signal C1.

The vertical reinforcement signal HV is supplied to the reinforcement signal preprocessor 5
The time-series shift and the format conversion process are performed to generate the coded reinforcement signal HVC. The reinforcement signal encoding unit 6 performs an encoding process for finely quantizing the signal component that plays an important role in improving the vertical resolution, and generates a second encoded data signal C2.

The ECC adding section 21 time-divisionally multiplexes these coded data signals, adds an error correction code,
An encoded data signal C5 that has been subjected to a code error protection measure is generated.

The main signal MS is subjected to motion adaptive type three-dimensional separation processing in the YC separation unit 29, and separated into a luminance low frequency signal YL, a carrier color signal C and a horizontal reinforcement signal HH. Then, the color demodulation unit 30 performs synchronous detection using the color subcarrier f _SC to demodulate the color difference signals C _B and C _R. Further, the HH demodulation unit 31 demodulates the luminance horizontal high-frequency component YH by the synchronous detection process. Then, the addition unit 32 adds the luminance low-frequency signal YL to demodulate the luminance signal Y.

In the main signal preprocessing section 33, for example, CCIT
The video encoding of T recommendation H.261 or the conversion processing to the image format of the encoding based on the moving image encoding standard MPEG for storage media is performed to generate the component encoded image signal CVS. Then, the main signal encoding unit 34 performs motion compensation DCT encoding and entropy encoding processing to generate a third encoded data signal C7.

In the time division multiplexer 9, the encoded data signal C
5 and C7 are time-division multiplexed to obtain a coded image data sequence C
4 is generated. Then, the channel coding unit 10 adds an error correction code to generate the transmission data signal CD.

In the decoding section shown in FIG. 9B, the channel decoding section 11 corrects the code error contained in the transmission data signal CD and decodes the coded image data series C4. Then, the time division separation unit 12 separates the encoded data signal C5 and the third encoded data signal C7.

The ECC correction unit 22 corrects the remaining code error that cannot be corrected by the correction processing in the channel decoding unit, time-division-separates the first coded data signal C1.
And the second encoded data signal C2.

The first encoded data signal C1 is decoded by the decoding unit 13 into the identification information signal EDP, and the identification signal demodulation unit 1
At 4, the identification control signal ED is demodulated based on this signal.

Further, for the second coded data signal C2, the coded reinforcing signal HVC is decoded by the reinforcing signal decoding unit 15,
The reinforcement signal demodulation unit 16 performs format conversion and time series shift processing to demodulate the vertical reinforcement signal HV.

On the other hand, the third coded data signal C7 is processed by the main signal decoding unit 35 as the component coded image signal CV.
Decrypt S. Performs conversion of image format in the main signal demodulation unit 36 demodulates the luminance low-band signal YL, luminance horizontal high-frequency component YH, the color difference signals C _B, the C _R. HH converter 3
In 7, the horizontal reinforcement signal HH is generated by the frequency shift processing by the carrier suppression amplitude modulation. The color modulator 38 orthogonally modulates the color difference signal by the color subcarrier f _SC to generate the carrier color signal C. These signals are added by the adder 39 to demodulate the main signal MS.

In the multiplexing section 19, the identification control signal ED, the vertical reinforcement signal HV, and the main signal MS are respectively supplied to a specific scanning line in the vertical blanking period, a non-image area above and below the screen, and a main image area. To synthesize. The DA converter 20 adds a predetermined synchronization signal or burst signal and performs analog conversion processing to demodulate the letterbox type EDTV system composite color television signal EDTV.

Next, FIG. 6 shows the overall block configuration of the encoding unit according to the sixth embodiment of the present invention. This is suitable for highly efficient coding of both the television signal of the letterbox type EDTV system and the NTSC system.

The composite color television signal VS is AD
Input to the conversion unit 1 and the method determination unit 23. The AD converter 1 samples at a frequency four times as high as the color subcarrier f _SC and converts it into a digital signal. Further, the system discriminating unit 23 discriminates the letterbox type EDTV system when there is an identification control signal on a predetermined scanning line and the NTSC system when there is no discrimination control signal, and produces the system identification information TVM. And the switch 24,
25 are terminals a and N in the letterbox type EDTV system.
In the TSC system, it is connected to the terminal b and the encoding process is performed.

In the separating unit 2, the letter box type EDTV is used.
Identification control signal ED in which a composite color television signal of the standard is added to a specific scanning line in the vertical blanking period
And the vertical reinforcement signal HV in the upper and lower non-picture area of the screen and the main signal MS in the main picture area.

The identification control signal ED is supplied to the identification signal preprocessor 3
The identification information signal EDP is extracted by and the encoding processing is performed by the encoding unit 4 to generate the first encoded data signal C1.

The vertical reinforcement signal HV is supplied to the reinforcement signal preprocessor 5
To the encoded supplementary signal HVC. The reinforcement signal encoding unit 6 performs an encoding process for finely quantizing the signal component that plays an important role in improving the vertical resolution, and generates a second encoded data signal C2.

On the other hand, the main signal MS of the letterbox type EDTV system or the composite color television signal of the NTSC system output from the switch 24 is subjected to motion adaptive three-dimensional separation processing by the YC separation unit 29 to reduce the luminance. Area signal Y
L, carrier color signal C, and horizontal reinforcement signal HH. Then, the color demodulation unit 30 performs synchronous detection using the color subcarrier f _SC to demodulate the color difference signals C _B and C _R. Also,
The HH demodulation unit 31 demodulates the luminance horizontal high frequency component YH by the synchronous detection process. In addition, in the case of the NTSC system, a signal of zero component is output. Then, the adder 32 demodulates the luminance signal Y by adding it to the luminance low-frequency signal YL.

In the main signal preprocessing unit 33, for example, CCIT
The video encoding of T recommendation H.261 or the conversion processing to the image format of the encoding based on the moving image encoding standard MPEG for storage media is performed to generate the component encoded image signal CVS. Then, the main signal encoding unit 34 performs motion compensation DCT encoding and entropy encoding processing to generate a third encoded data signal C7.

The time division multiplexing unit 9 time division multiplexes the first, second and third encoded data signals. In addition, a system code representing the letterbox EDTV system is also multiplexed. Then, a letter box type EDTV system encoded image data sequence C8 is generated.

The letter box type EDTV system coded image data sequence C8 or N output from the switch 25.
A signal C7 corresponding to a TSC encoded image data sequence
The coded image data sequence C4 created in (1) is added with an error correction code in the channel coding unit 10 to generate a transmission data signal CD.

According to the fourth to sixth embodiments described above, the component coding is performed with the characteristic that the deterioration of the image quality due to the coding is extremely small and the compression efficiency of the information amount is excellent. It is possible to realize a letter box type EDTV system television signal image encoding device.

Next, the main block portions in the first to sixth embodiments will be described based on the embodiments.

First, matters relating to the encoding of the vertical reinforcement signal will be described with reference to FIGS. 7 to 11 and Tables 1 and 2.

FIG. 7 is a diagram showing an example of the form of a vertical reinforcement signal in the letterbox type EDTV system. In either form, the vertical reinforcement signal HV is composed of a luminance vertical high frequency signal VH (a component having a vertical frequency of 360 TV lines or more at rest) and an LD (a component having a vertical frequency of less than 360 TV lines).

HV-1 shown in FIG. 9A is the signal VH,
A signal obtained by compressing the horizontal time axis of the LD by 1/3 (horizontal frequency μ
<4.2 MHz) is the f of the time frequency f and the vertical frequency ν
-A region with a time frequency of ± 15 Hz in the ν region (A,
(B or C area) and 0 Hz area.

The HV-2 in FIG. 9B is μ <of HV-1.
The component of 3.58 MHz is amplitude-modulated by the subcarrier f _{S C} * (the frequency is the same as the color subcarrier f _SC and the phase is the same in each line period).

Further, HV-3 in FIG. 7C is HV-1.
(Phase inverted every line period) of the mu <component color subcarrier f _SC of 3.58MHz constructed by amplitude modulation with.

In the HV-2 and HV-3 modes, a letterbox type EDTV system television signal is currently used.
When it is received by the TSC type receiver, the main component of the vertical reinforcement signal is received as a color signal. Therefore, HV-
Compared to 1, it has an advantage that interference in the current receiver can be reduced.

Table 1 shows a typical high-efficiency coding technique PC-1 in the case of collective coding in which the vertical reinforcement signal HV is coded directly, that is, in the state where the signals VH and LD are mixed.
-The characteristic obtained by PC-4 is shown.

[0099]

[Table 1]

Since the vertical reinforcement signal HV includes a component whose polarity is inverted at each frame cycle (a component having a time frequency of ± 15 Hz), PC-3 and PC-4 for encoding between frames are used.
Then, the prediction error is large, and encoding with high compression efficiency cannot be expected. Further, in HV-2 and HV-3, since the main component exists near f _{SC of the} horizontal frequency, it is difficult to obtain high compression efficiency in PC-1 that performs DPCM coding. On the other hand, in PC-2 that performs orthogonal transform (Hadamard transform or DCT) coding within a frame, coding with high compression efficiency is possible in any form.

Table 2 shows the characteristics in the case of the separate coding in which the vertical reinforcement signal HV is separated into the signals VH and LD and the respective signals are coded.

[0102]

[Table 2]

In this case, PC-3 and PC-4, which perform coding between frames, enable coding with high compression efficiency. It should be noted that P for encoding within a frame
The characteristics of C-1 and PC-2 are similar to those shown in Table 1 above.

Therefore, in encoding the vertical reinforcement signal,
Encoding with high compression efficiency can be realized by using the high-efficiency encoding techniques indicated by circles in Tables 1 and 2.

FIG. 8 is a diagram showing an embodiment of the reinforcement signal preprocessing unit 5. As shown in FIG. 7A, the time series shift unit 40,
The LD / VH separation unit 41, the 15 Hz modulation unit 42, and the coding format conversion unit 43 are used to generate a coding-enhanced signal HVC for collective coding or separate coding.

The time series shift section 40 is composed of a memory,
Signal writing (WT operation) and reading (RD operation) as shown in FIG. 7B are performed to generate a time-series shifted signal S1. In the LD / VH separation unit 41, the signal S1
The signal LD near the time frequency of 0 Hz and the signal VH near the time frequency of ± 15 Hz are separated by calculating the sum or difference between the frames. Then, the 15 Hz modulator 42 performs a process of inverting the polarity of the signal for each frame period, and generates a signal VH ′ that is frequency-shifted in the vicinity of the time frequency of 0 Hz. In the encoding format conversion unit 43, for example, in horizontal / vertical two-dimensional orthogonal conversion encoding, conversion processing into an encoding format such as conversion into a signal sequence in units of blocks of N lines by XN pixels is performed. Generate a coded augmented signal HVC.

FIG. 9 is a diagram showing an embodiment of the reinforcement signal encoding unit 6. The predictive coding unit 44, the quantizing unit 45, the entropy coding unit 46, and the buffer unit 47 are configured to perform a high-efficiency coding process suitable for the vertical reinforcement signal.

The predictive coding unit 44 uses the DPC of PC-1.
M coding, PC-2 intraframe orthogonal transform coding, PC
-3 inter-frame predictive coding, or PC-4 inter-frame predictive coding and orthogonal transform coding, and the prediction error component or orthogonal transform coefficient obtained by the coding is signal S1.
Output as 0. The quantizer 45 quantizes the signal S10 and encodes it into a fixed-length code signal S11. In addition,
In this process, the signal component that plays an important role in improving the vertical resolution is finely quantized with the characteristic that the quantization error is reduced. FIG. 10 shows an example of quantization characteristics for transform coefficients of DCT orthogonal transform coding in a frame. FIG. 9A shows the case of collective coding, in which the DC component and the shaded area components in the figure become important signal components for improving vertical resolution, and these signals are finely quantized. FIG. 7B shows the case of separate encoding, and the DC component and the dot region component in the figure are signal components important for improving the vertical resolution. Therefore, fine quantization characteristics are assigned to these components, and encoding with a small quantization error is performed.

The entropy coding section 46 performs variable length coding (VLC) and run length coding (RLC) processing in which a code having a short code length is assigned to a code having a high occurrence probability. Then, the variable length code signal S12 is input to the buffer unit 47. On the other hand, the signal is read from the buffer unit 47 at a constant bit rate to generate the second coded data signal C2.

Since the reinforcement signal decoding unit 15 can be realized by a structure for performing signal processing reverse to that of the reinforcement signal encoding unit 6, description thereof will be omitted.

FIG. 11 shows an embodiment of the reinforcement signal demodulation section 16. As shown in FIG. 9A, the image format conversion unit 48, the time series shift unit 49, the 15 Hz modulation unit 42,
The adding section 50 is used. The encoded reinforcement signal HVC is input to the image format conversion unit 48, the encoded signal sequence is converted, and the signal S1 (LD, VH 'in the case of separate encoding) shown in FIG. To do. The signal VH 'is subjected to a process of inverting the polarity of the signal in the 15 Hz modulator 42 at each frame cycle, frequency-shifted to the vicinity of the time frequency ± 15 Hz and the signal VH is decoded. And the addition unit 5
At 0, it is added to the signal LD to decode the signal S1. The time-series shift unit 49 is composed of a memory and performs time-series shift processing by writing (WT operation) and reading (RD operation) signals as shown in FIG. During the period, the vertical reinforcement signal HV is demodulated.

Next, an embodiment of the main signal coding unit will be described with reference to FIG.
2, described with reference to FIG.

FIG. 12 is a diagram showing one embodiment of the main signal coding unit 8 which performs the composite direct coding in the first to third embodiments. The coded main signal MSC is subjected to a matrix operation by a Hadamard transform matrix of 8 rows and 8 columns in a Hadamard transform section 51 to generate a transform coefficient signal S13. The quantizer 52 quantizes the transform coefficient signal S13 and encodes it into a fixed length code signal S14. Parameters such as the quantization size are set by the control signal QCT from the encoding control unit 55. In the entropy coding unit 53, the DC component of the transform coefficient and the two color components are subjected to DPCM coding, and the other AC components are subjected to variable length coding. Then, the variable length code signal S15 is written in the buffer unit 54. On the other hand, a signal is read from the buffer section at a constant bit rate to generate a third coded data signal C3. Further, the coding control unit 55 creates a control signal QCT for setting a coding parameter based on the buffer capacity information BF.

Since the main signal decoding unit 17 can be realized by a structure for performing the reverse processing of the signal processing of this encoding unit, the description thereof will be omitted.

FIG. 13 is a diagram showing one embodiment of the main signal coding unit 34 which performs component coding in the fourth to sixth embodiments. Control signal CT from encoding control unit 62
Thus, the switches 57 and 69 are connected to the terminal a in the intra-frame coding mode (I picture) and to the terminal b in the inter-frame coding mode (P, B picture) to perform the coding process.

The output signal of the switch 57, that is, the component coded image signal CVS at the time of I picture,
In P and B pictures, the prediction error signal PE is input to the DCT operation unit 58 and is operated by the discrete cosine transform matrix of 8 rows and 8 columns to generate the transform coefficient signal S20. The quantizer 59 quantizes the transform coefficient to generate a fixed code length signal S21. The parameters such as the quantization size are set by the control signal QCT.

The entropy coding unit 60 performs VLC coding and RLC coding processing. Then, the variable length code signal S22 is written in the buffer unit 61. On the other hand, the signal is read from the buffer unit at a constant bit rate,
Of the encoded data signal C7. In addition, the encoding control unit 62 generates a control signal QCT that sets a quantization parameter based on the buffer capacity information BF.

On the other hand, the inverse quantization process in the inverse quantization unit 63,
The signal S23 (corresponding to the signal CVS for the I picture and the signal PE for the P and B pictures) decoded by the decoding process of the inverse cosine transform inverse matrix calculation in the IDCT calculation unit 64 is output from the switch 69 of the switch 69 in the addition unit 65. Output signals (a signal of zero component for I pictures and a prediction signal PS for P and B pictures) are added to decode the component coded image signal CVS '. Then, this signal is input to the frame memory 66.

The MC prediction signal generator 67 performs motion compensation processing on the output signal of the frame memory 66 to generate a prediction signal PS. The motion vector information MV required for this motion compensation processing is detected by the motion vector detection unit 68 by a method such as block matching. The subtraction unit 56 subtracts the prediction signal PS from the signal CVS to generate the prediction error signal PE.

The main signal decoding unit 35 can be realized by a structure for performing signal processing reverse to that of the coding unit, and therefore description thereof will be omitted.

This is the end of the description of the main block parts. It should be noted that the third or the sixth, which is provided with a method discrimination unit
The configuration of this embodiment can also be applied to the second and fifth embodiments.

In the letterbox type EDTV system, the vertical reinforcement signal HV in the upper and lower non-image areas of the screen is formed by superimposing a signal having an amplitude level of about ± 30 IRE on the reference setup level signal. Therefore, the dynamic range of the vertical reinforcement signal component is a fraction of the image signal.
It is a degree. Therefore, in the AD conversion processing, the vertical reinforcement signal is quantized with a finer characteristic in the quantization step width than that of the image signal, and the vertical reinforcement signal is encoded with high accuracy by performing the encoding process. It is possible. These examples are shown in FIGS.

FIG. 14 is an overall block diagram of the seventh embodiment of the present invention. This is a letterbox type EDT
This is suitable for composite direct encoding of the main signal in the main picture area of the V system.

In the encoding section shown in FIG. 9A, a letterbox type EDTV system composite color television signal EDT is used.
V is input to the separation unit 70, and is separated into the vertical reinforcement signal AHV in the upper and lower non-image areas of the screen and the signal AMS in the other areas. In the AD converters 71 and 72, the color subcarrier f _SC
Sampling is performed at a frequency four times higher than that, and converted into a digital signal. In the AD converter 71, the AD converter 72
PCM encoding is performed with a finer quantization step width (about 1/2 to 1/4) to create a highly accurate digitized vertical reinforcement signal HV.

The vertical reinforcement signal HV is supplied to the reinforcement signal preprocessor 5
To the encoded supplementary signal HVC. Then, the reinforcement signal encoding unit 6 performs an encoding process for finely quantizing the signal component that plays an important role in improving the vertical resolution,
The second encoded data signal C2 is generated.

Of the signals digitized by the AD conversion section 72, the identification control signal ED is extracted by the identification signal preprocessing section 3 into the identification information signal EDP, and the encoding section 4 performs the encoding processing to obtain the first signal. A coded data signal C1 of 1 is generated.

On the other hand, the main signal MS in the main picture area is input to the main signal preprocessing section 7 and subjected to format conversion processing to generate a coded main signal MSC. Then, the main signal encoding unit 8 performs a composite direct encoding process similar to the conventional technique, such as Hadamard transform encoding and entropy encoding in a frame, and generates a third encoded data signal C3.

The time division multiplexing unit 9 time-divisionally multiplexes the first, second, and third coded data signals to generate a coded image data series C4. Then, the channel coding unit 10 performs a process of adding a code for error correction to generate a transmission data signal CD.

In the decoding section shown in FIG. 13B, the transmission data signal CD is input to the channel decoding section 11 to correct the code error and decode the coded image data series C4. The time division demultiplexing unit 12 separates the time-division multiplexed signal into a first coded data signal C1, a second coded data signal C2, and a third coded data signal C3.

For the second encoded data signal C2, the supplemental signal decoding unit 15 decodes the encoded supplementary signal HVC, and the supplemental signal demodulation unit 16 performs format conversion and time series shift processing to obtain the vertical supplemental signal HV. Demodulate. And DA
The conversion unit 74 performs conversion into an analog signal and demodulates the analog vertical reinforcement signal AHV.

On the other hand, the first encoded data signal C1 is decoded by the decoding section 13 into the identification information signal EDP, and the identification signal demodulation section 14 demodulates the identification control signal ED based on this signal.

As for the third coded data signal C3, the main signal decoding unit 17 decodes the coded image signal MSC, and the main signal demodulation unit 18 performs format conversion processing.
Demodulate the main signal MS.

The DA converter 73 converts the signals ED and MS into analog signals and demodulates the signal AMS.

In the multiplexing unit 75, the signal AHV and the signal AMS are
, A predetermined synchronizing signal and a burst signal are added, and a composite color television signal EDTV of the letterbox type EDTV system is demodulated.

In the present embodiment, the coded data of the identification control signal and the vertical reinforcement signal are provided with a code error protection process, or the system is discriminated between the letterbox type EDTV system and the NTSC system. It is possible to apply a configuration that performs encoding of either method, or a configuration that combines the functions of both.

FIG. 15 is an overall block diagram of the eighth embodiment of the present invention, which is suitable for component coding the main signal of the main picture area of the letterbox type EDTV system.

In the encoding section shown in FIG. 9A, the composite color television signal EDT of the letterbox type EDTV system is used.
V is input to the separation unit 70, and is separated into the vertical reinforcement signal AHV in the upper and lower non-image areas of the screen and the signal AMS in the other areas. In the AD converters 71 and 72, the color subcarrier f _SC
Sampling is performed at a frequency four times higher than that, and converted into a digital signal. In the AD converter 71, the AD converter 72
PCM encoding is performed with a finer quantization step width (about 1/2 to 1/4) to create a highly accurate digitized vertical reinforcement signal HV.

The vertical reinforcement signal HV is supplied to the reinforcement signal preprocessor 5
, And performs a time series shift and a format conversion process to generate a coding reinforcement signal HVC. Then, the reinforcement signal coding unit 6 performs a coding process for finely quantizing the signal component that plays an important role in improving the vertical resolution, and generates a second coded data signal C2.

Of the output signals of the AD conversion section 72, the identification control signal ED is input to the identification signal preprocessing section 3 and the identification information signal EDP is extracted. Then, the encoding unit 4 performs the encoding process to generate the first encoded data signal C1.

On the other hand, the main signal MS is subjected to motion adaptive three-dimensional separation processing in the YC separation unit 29, and the luminance low band signal YL is obtained.
And the carrier color signal C and the horizontal reinforcement signal HH.
The color demodulation unit 30 performs synchronous detection using the color subcarrier f _SC to demodulate the color difference signals C _B and C _R. In addition, the HH demodulator 3
In 1, the luminance horizontal high frequency component YH is demodulated by the synchronous detection process. Then, the adder 32 demodulates the luminance signal Y by adding it to the luminance low-frequency signal YL.

In the main signal preprocessor 33, for example, CCIT
Recommendation H.T. Then, conversion processing to an image format of the video encoding of H.261 or the encoding based on the moving image encoding standard MPEG for storage media is performed to generate a component encoded image signal CVS. Then, the main signal encoding unit 34 performs motion compensation DCT encoding and entropy encoding processing to generate a third encoded data signal C7.

The time division multiplexing unit 9 time-divisionally multiplexes the first, second and third coded data signals to generate a coded image data series C4. Then, the channel coding unit 10
Then, processing for adding an error correction code is performed to generate the transmission data signal CD.

In the decoding section shown in FIG. 13B, the channel decoding section 11 corrects the code error contained in the transmission data signal CD and decodes the coded image data series C4. Then, in the time division separation unit 12, the first coded data signal C1, the second coded data signal C2, and the third coded data signal C2.
Of the encoded data signal C7.

For the second encoded data signal C2, the reinforcement signal decoding unit 15 decodes the encoded reinforcement signal HVC, and the reinforcement signal demodulation unit 16 performs format conversion and time-series shift processing to obtain the vertical reinforcement signal HV. Demodulate. And DA
The conversion unit 74 performs conversion into an analog signal and demodulates the analog vertical reinforcement signal AHV.

On the other hand, the first encoded data signal C1 is decoded by the decoding section 13 into the identification information signal EDP, and the identification signal demodulation section 14 uses the identification control signal ED based on this signal.
Demodulate.

Further, the third decoded data signal C7 is processed by the main signal decoding unit 35 as the component coded image signal CV.
Decrypt S. The main signal demodulation unit 36 performs image format conversion processing and demodulates the luminance low-frequency signal YL, the luminance horizontal high-frequency component YH, and the color difference signals C _B and C _R. The HH converter 37 performs a frequency shift process by carrier suppression amplitude modulation to generate a horizontal reinforcement signal HH. Color modulator 3
In 8, the color difference signal is quadrature-modulated with the color subcarrier f _SC to generate the carrier color signal C. The adder 39 adds these signals and demodulates the main signal MS.

The DA converter 73 converts the signals ED and MS into analog signals and demodulates the signal AMS in the area excluding the vertical reinforcement signal.

In the multiplexing unit 75, the signal AHV and the signal AMS are
, Add a predetermined sync signal and burst signal,
The letterbox type EDTV composite color television signal EDTV is demodulated.

In the present embodiment, the coded data of the identification control signal or the vertical reinforcement signal is provided with a code error protection process, or the system is discriminated, and either the letter box type EDTV system or the NTSC system is provided. It is also possible to apply a configuration in which the above method is encoded, or a configuration in which both functions are combined.

[0150]

According to the present invention, the compression efficiency of the information amount is high, and the deterioration of the image quality due to the encoding is extremely small,
Letterbox type EDTV for high quality video transmission
It is possible to realize an image encoding apparatus for a composite color television signal of the standard.

[Brief description of drawings]

FIG. 1 is an overall block configuration diagram of a first embodiment of the present invention.

FIG. 2 is an overall block configuration diagram of a second embodiment of the present invention.

FIG. 3 is an overall block configuration diagram of a third embodiment of the present invention.

FIG. 4 is an overall block configuration diagram of a fourth embodiment of the present invention.

FIG. 5 is an overall block configuration diagram of a fifth embodiment of the present invention.

FIG. 6 is an overall block configuration diagram of an encoding unit according to a sixth embodiment of the present invention.

FIG. 7 is a signal form diagram of a vertical reinforcement signal HV.

FIG. 8 is a diagram illustrating an embodiment of a reinforcement signal preprocessing unit.

FIG. 9 is a diagram showing an embodiment of a reinforcement signal encoding unit.

FIG. 10 is a characteristic diagram of DCT transform coefficients.

FIG. 11 is a diagram illustrating an example of a reinforcement signal demodulation unit.

FIG. 12 is a diagram showing an example of a main signal encoding unit in the first example.

FIG. 13 is a diagram showing an embodiment of a main signal encoding unit in the fourth embodiment.

FIG. 14 is an overall block configuration diagram of a seventh embodiment of the present invention.

FIG. 15 is an overall block configuration diagram of an eighth embodiment of the present invention.

[Explanation of symbols]

1 ... AD conversion unit, 2 ... Separation unit, 3 ... Identification signal preprocessing unit,
4 ... Encoding unit, 5 ... Reinforcement signal preprocessing unit, 6 ... Reinforcement signal encoding unit, 7 ... Main signal preprocessing unit, 8 ... Main signal encoding unit, 9
... time division multiplexing unit, 10 ... channel encoding unit, 11 ... channel decoding unit, 12 ... time division separating unit, 13 ... decoding unit,
14 ... Identification signal demodulation unit, 15 ... Reinforcement signal decoding unit, 16
... Reinforcement signal demodulation unit, 17 ... Main signal decoding unit, 18 ... Main signal demodulation unit, 19 ... Multiplexing unit, 20 ... DA conversion unit, 21 ... E
CC addition unit, 22 ... ECC correction unit, 23 ... Method determination unit,
24, 25 ... Switch, 26 ... System code discrimination section, 2
7, 28 ... Switch, 29 ... YC separation section, 30 ... Color demodulation section, 31 ... HH demodulation section, 32 ... Addition section, 33 ... Main signal preprocessing section, 34 ... Main signal coding section, 35 ... Main signal decoding Conversion unit, 36 ... Main signal demodulation unit, 37 ... HH modulation unit, 38 ... Color modulation unit, 39 ... Addition unit, 40 ... Time-series shift unit, 41 ...
LD / VH separation section, 42 ... 15 Hz modulation section, 43 ... Coding format conversion section, 44 ... Prediction coding section, 45 ... Quantization section, 46 ... Entropy coding section, 47 ... Buffer section, 48 ... Image format conversion Section, 49 ... time-series shift section, 50 ... addition section, 51 ... Hadamard transformation section, 52 ...
Quantization unit, 53 ... Entropy coding unit, 54 ... Buffer unit, 55 ... Coding control unit, 56 ... Subtraction unit, 57, 69
... switch, 58 ... DCT calculation section, 59 ... quantization section, 6
0 ... Entropy coding unit, 61 ... Buffer unit, 62 ...
Decoding unit 63, inverse quantizer 64, IDCT calculator 65, adder 66, frame memory 67, MC
Prediction signal generation unit, 68 ... Motion vector detection unit, 70 ... Separation unit, 71, 72 ... AD conversion unit, 73, 74 ... DA conversion unit, 75 ... Multiplexing unit.

Claims (8)

[Claims] 1. An image encoding apparatus for transmitting and receiving a television signal by compressing the information amount by high efficiency encoding to transmit a letterbox type EDTV type television signal, an identification control signal, and an upper and lower screen image. Means for signal separation for separating the vertical reinforcement signal of the partial area and the main signal of the main image area,
A high-efficiency encoding process generates a first encoded data signal of the identification control signal, a second encoded data signal of the vertical reinforcement signal, and a third encoded data signal of the main signal. Means for highly efficient encoding, the first encoded data signal, the second encoded data signal, and the third encoded data signal are time-division multiplexed to generate an encoded image data sequence. And a channel coding means for generating a transmission data signal by adding an error correction or error detection code to the coded image data series. EDTV image encoding device. 2. The first coded data signal and the second coded data signal according to claim 1, wherein high-efficiency coded coded data is added with an error correction or error detection code. An EDTV image encoding device characterized by being a signal. 3. The EDTV image coding apparatus according to claim 1, wherein the third coded data signal of the main signal by high-efficiency coding is generated by composite direct coding. . 4. The EDTV image coding apparatus according to claim 1, wherein the third coded data signal of the main signal is generated by high-efficiency coding by component coding. 5. The second encoded data signal of the vertical reinforcement signal by high efficiency encoding is generated by collective encoding in which the vertical reinforcement signal is encoded as it is.
The EDTV image encoding device according to any one of items 1 to 4. 6. Generation of a second encoded data signal of a vertical reinforcement signal by high efficiency encoding includes a first reinforcement signal composed of signal components with a time frequency near 0 Hz and a time frequency of ± 1.
A second reinforcement signal composed of a signal component in the vicinity of 5 Hz, and encoded data obtained by encoding the first reinforcement signal and encoded data obtained by encoding the second reinforcement signal. 5. The EDTV image coding apparatus according to claim 1, wherein the coding data signal is generated by separate coding. 7. A means for performing system identification of a television signal is provided, and an NTSC television signal is subjected to high-efficiency encoding processing by regarding the entire image area as a main signal. 7. An EDTV image encoding device according to any one of items 6 to 6. 8. The vertical reinforcement signals in the non-picture area on the upper and lower sides of the screen are converted into digital signals by sampling with a finer quantization size than the main signal in the main picture area. E according to claim 1 to 7, characterized in that
DTV image encoding device.