JPH0514930A - Non-interlaced TV signal transmission device - Google Patents

Abstract

PURPOSE:To reproduce a signal equal to an original non-interlace luminance signal at a reception side by generating the V-T helper signal of the Y signal from the non-interlace luminance signal being the one before the execution of a V-T pre-filter and permitting a band in the time vertical frequency plane of the V-T helper signal to be the band removed by means of the V-T pre-filter. CONSTITUTION:The Y signal of 525/60/60 from an input terminal 1c is inputted to the V-T pre-filter 2c so as to be band-restricted, is inputted to a helper signal generator 50 so as to generate the V-T helper signal 214 and is inputted to horizontal LPF 6. A signal component lost in the filter 2c comes to be transmitted by the V-T helper signal 215. The signal 214 is band-restricted in LPF 6 so as to be inputted to a transmitter 7, orthogonally modulated to video carrier wave and becomes the signal which is transmission possible by a present transmitting NTSC transmission line so as to be outputted. Thus, the signal equal to the original non-interlace luminance signal is reproduced at the reception side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-interlaced TV signal transmission apparatus for converting a non-interlaced signal into an interlaced signal for transmission and reproducing the original non-interlaced signal on the receiving side.

[0002]

2. Description of the Related Art FIG. 8 shows, for example, IEEE TRAN.
SACTIONS ON BROADCASTING
VOL. BC-33, NO. 4 DECEMBER
1987 "Encoding for Compati"
bility and Recoverability
in the ACTY System ”(Davi
d Sarnoff Research Center
It is a block circuit diagram of the example of 1 structure of the transmission apparatus of the conventional non-interlaced TV signal shown by r).

In the figure, 1a, 1b and 1c are input terminals, and 1a has 525 non-interlaced scans per field (hereinafter, "525/60/60" or pay attention to the number of effective scanning lines "480/60". Abbreviated as "/ 60"), 1b is a 525/60/60 I signal, and 1c is a 5 signal.
The 25/60/60 Y signal is input. Q entered
The signal 201, the I signal 202, and the Y signal 203 are input to interlace converters 3a, 3b, and 3c that convert a non-interlaced signal into an interlaced signal via the VT prefilters 2a, 2b, and 2c, respectively. ,at the same time,
The output signal 206 of the VT pre-filter 2c is also input to the helper signal generator 5.

The output 207 of the interlace converter 3a is
Interlace converter 3 as first input of encoder 4
The output 208 of b is as the second input of the encoder 4,
The output 209 of the interlace conversion 3c is input as the third input of the encoder 4. The encoder 4 encodes the input Y, I, and Q signals into a signal that can be transmitted by the current NTSC system, and inputs the signal as the first input 211 of the transmitter 7.

The output 210 of the helper signal generator 5 is input to a horizontal low-pass filter (hereinafter referred to as "H-LPF"), and the VT helper signal with the horizontal band limited is output to the second side of the transmitter 7. Input 212. The transmitter 9 RF-modulates the input 211 from the encoder 4 and the VT helper signal 212 and outputs the result to the output terminal 8.

Next, the operation will be described. The V-T pre-filters 2a to 2c are band limiting filters, and the interlace converters 3a to 3c in the next stage are used to input the input signals 204, 205, 20.
6 limits the band of the input signal in order to remove the aliasing distortion that occurs when 6 is converted into the interlaced signals 207, 208, 209. For the region occupied by the input signal shown by the broken line in FIG. , The signal component in the shaded area is passed, and the signal component in the non-hatched area is removed.

FIG. 10 shows a signal of 525/60/60 as V-
In the figure represented by the T plane, the VT pre-filters 2a, 2b,
2c is a data S _ij of the pixel of interest S _ij, the data S _{i-1 J} of one field before and after the pixel, the data _{S ij-1, S ij +} 1 of S i _{+ 1j} and 1 line above and below the pixel, For example, the addition value A obtained by weighting the coefficients shown in FIG.
The calculation of the following equation for _{obtaining ij} is performed, and the signal in which the pixel data S _ij is replaced with the added value A _ij is output. A _ij = (S
_i-1J + S _ij-1 + 4S _ij + S _{ij + 1} + S _{i + 1j} ) / 8 Therefore, the output 20 of the VT pre-filters 2a, 2b, 2c
As shown in FIG. 13B, 4, 205, and 206 are signals in which, for example, the pixel data S _ij in FIG. 13A is replaced with the added value A _ij .

The outputs 204, 205, 206 of the VT pre-filters 2a, 2b, 2c are interlaced converters 3, respectively.
Q of 525/60/60 input to a, 3b, 3c
The signals, I signals, and Y signals are converted into 525/60/30 interlaced Q signals, I signals, and Y signals. This interlaced converted Q signal 207, I signal 208, Y
As shown in FIG. 13C, the signal 209 is a signal in which only odd lines are transmitted in a certain field and only even lines are transmitted in the next field.

The helper signal generator 5 receives the input 52
From the Y signal 206 of 5/60/60, the VT helper signal 210 for reproducing the information of the Y signal lost by the interlace conversion is generated.

FIG. 11 is a block circuit diagram of the helper signal generator 5, in which 19 and 20 are 525H delay circuits and 21 to 23.
Is a coefficient circuit, 24 is an adder, and the VT pre-filter 2c
The Y signal 206 input from the 525H delay circuit 1
9, 20 delays by 525H, the Y signal 206 is multiplied by [-1/2] in the coefficient circuit 21, and the output of the 525H delay circuit 19 is multiplied by [1] in the coefficient circuit 22 to obtain 525.
The output of the delay circuit 20 is multiplied by [-1/2] in the coefficient circuit 23, and the signals multiplied by these coefficients are added by the adder 24 to output the VT helper signal 210.

The V-T helper signal 210 is obtained by calculating the pixel data lost by the interlace conversion of the Y signal from the output of the V-T pre-filter 2c by the following formula. α _ij = A _ij − (A _i-1J + A _{i + 1j} ) / 2, that is, data lost in the interlace conversion, for example, FIG.
The information of the sum A _ij in (b), the average value of one field before and after addition value A _{i-1 J} and A _{i + 1j,} demold the difference between the sum value A _ij as alpha _ij, the data Is transmitted,
For example, David Sarnoff Research
In hCenter, the image carrier is orthogonally modulated and transmitted. The frequency band of the V-T helper signal 210 is the portion shown by the hatched portion in FIG.

The interlaced Q signal 207, I signal 208, and Y signal 209 are input to the encoder 8 and encoded into signals that can be transmitted on the existing NTSC transmission line.
It is input to the transmitter 7. On the other hand, V-T helper signal 21
0 is horizontal 1.5 MH for quadrature modulation to video carrier
After passing through the H-LPF 6 of _Z , its output 212 is input to the transmitter 7 and output as a signal 213 that can be transmitted on the current NTSC transmission line.

[0013]

In the conventional non-interlaced signal transmission apparatus, the V-T prefilter is used to limit the band of the Y signal to the shaded area in FIG. 9 in order to compensate for this missing portion. Since the V-T helper signal transmitted to the H.264 signal is a signal component in the shaded area in FIG. 12, there is a problem that the original signal component surrounded by the broken line in FIG. 9 cannot be completely reproduced. It was

That is, as shown in FIG. 13E, the horizontal low-frequency component _XL and the horizontal high-frequency component XL of the pixel X reproduced into the non-interlaced signal by using the VT helper signal on the receiving side. Each _H is expressed by the following equation and does not become the original data S _ij . _{X L = α ij + (A} i-1J + A i + 1j)
/ 2X _H = (A _i-1J + A _{i + 1j} ) / 2

The present invention has been made to solve the above problems, and a non-interlaced signal capable of almost completely reproducing the horizontal low frequency component of the Y signal on the receiving side to the original signal. The purpose is to obtain a transmission device.

[0016]

According to a first aspect of the present invention, there is provided a non-interlaced TV signal transmission device for a scanning line which is not transmitted by being converted into an interlaced signal of an input non-interlaced Y signal. From the pixel data S _ij , the pixel data S _ij-1 and S _{ij + 1 above} and below and the pixel data S _i-1J and S _{i + 1 j} of the fields before and after it, the following expression α _ij = S _ij − (S _{i- 1J} + S _ij-1 + S _{ij + 1} + S _{i + 1j} ) /
4, a means for creating a VT helper signal of the scanning line which is not transmitted, and a non-interlaced Y on the receiving side.
When reproducing the signal, the pixel data X of the scanning line to be interpolated is
The following formula X = α _ij + (A _i-1J + A _ij-1 + A _{ij + 1} + A _{i + 1j} ) /
4 is provided and means for interpolating and interpolating.

Non-interlaced T according to the invention of claim 2
The V signal transmission device converts a non-interlaced Y signal of the input non-interlaced Y signal into a non-transmission VT helper signal of a scanning line whose band is limited by a VT prefilter. Pixel data A _ij (= of the scanning line not transmitted of the interlaced Y signal)
(S _i-1J + S _ij-1 + 4S _ij + S _{ij + 1} + S _{i + 1j} ) / 8),
From the upper and lower pixel data A _ij-1 and A _{ij + 1} and the pixel data A _i-1J and A _{i + 1j of the fields} before and after it, the following equation β _ij =
_VT helper signal generating means for generating the VT helper signal of the scanning line which is not transmitted based on A _ij − (A _i−1J + A _ij−1 + A _{ij + 1} + A _{i + 1j} ) / 4, and reception. When reproducing the non-interlaced Y signal on the side, the pixel data X of the scanning line to be interpolated is expressed by the following equation X = β _ij + (A _i-1J + A _ij-1 + A
_{ij + 1} + A _{i + 1j} ) / 4, and means for interpolating a scan line that has not been transmitted.

[0018]

According to the present invention, the _VT helper signals α _ij and β _ij produced by the VT helper signal producing means are converted from non-interlaced signals to interlaced signals. It contains the information of the pixel data of the scanning line of the Y signal which is not transmitted. For this reason,
When converting the pixel data of the scanning line to be interpolated using the transmitted VT helper signal when converting to the non-interlaced signal on the receiving side, the non-interlaced Y signal which is almost the same as the non-transmitted scanning line is calculated. Can be played.

[0019]

EXAMPLES Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block circuit diagram of this embodiment. The same parts as those in the conventional example of FIG. In the figure, 50 is a helper signal generator, which creates a VT helper signal 214 from a Y signal of 525/60/60 input from the input terminal 1c, and the created helper signal 214 is sent to the H-LPF 6. Is entered.

FIG. 2 is a block circuit diagram of the helper signal generator 50. In the figure, 9 is a delay circuit, which delays the Y signal input from the input terminal 1c by 524H.
A 1H delay circuit 10 delays the output of the delay circuit 9 by 1H. Reference numeral 11 denotes a second 1H delay circuit 1H delay circuit 1
The output of 0 is further delayed by 1H. 12 is the second 52
The 4H delay circuit delays the output of the 1H delay circuit 11 by 524H. 13 to 17 have predetermined coefficients [-1 /
4], [-1/4], [1], [-1/4], [-1 /
4] is added to the coefficient circuit, and 18 is an adder for adding the outputs of the coefficient circuits 13 to 17.

FIG. 3 is a diagram showing a deinterlacing circuit on the receiver side. In the figure, 30 is a terminal to which the received interlaced signal is input, 31 is a terminal to which the received VT helper signal is input, 31 is a delay circuit that delays the signal input from the input terminal 30 by 524H, 32 is a delay circuit that delays the output of the delay circuit 31 by 2H, 33 is a delay circuit that delays the output of 32 by 524H, and 34 to 37 are the input terminal 30 and the delay circuit 3.
A coefficient circuit for multiplying the outputs of 1, 32 and 33 by a predetermined coefficient, 38 is an adder for adding the outputs from the coefficient circuits 34 to 37, and 39 is a signal output from the adder 38 to the signal input from the delay circuit 31. An adder 40 for adding the generated signals is an output terminal of the signal output from the adder 39.

Next, the operation will be described. Input terminal 1
The I and Q signals input from a and 1b are the same as those in the conventional example, and therefore the description thereof is omitted.

525/60 input from the input terminal 1c
The Y signal of / 60 is input to the VT pre-filter 2c and band-limited, and is also input to the helper signal generator 50. From the Y signal of 525/60/60 shown in FIG. The _VT helper signal α _ij shown in d) is _generated . For example, paying attention to the scanning line S _ij in FIG. 5A, the scanning line V-T helper signal α _ij is α _ij = S _ij − (S _i-1J + S _{ij −1} + S _{ij + 1} + S _{i + 1j} ) / 4, and the characteristics of the pass band of the VT helper signal at this time are as shown in FIG.

Therefore, according to this embodiment, the signal component lost by applying the VT pre-filter 2c from the entire band (the area surrounded by the broken line in FIG. 9) having the original non-interlaced signal. Will be sent with the V-T helper signal 215.

525/60 by the interlace converter 3c
The Y signal converted from / 60 to 525/60/30 is
525 / output from interlace converters 3a and 3b
The 60/30 I signal and Q signal are input to the encoder 4, and become a signal that can be transmitted by the current NTSC transmitter, and are input to the transmitter 7.

On the other hand, the VT helper signal 214 generated by the helper signal generator 50 is 1.5 in H-LPF6.
After being band-limited to MH _Z , it is input to the transmitter 7, quadrature-modulated to a video carrier, and output as a signal that can be transmitted on the current NTSC transmission line.

As a result, in the receiving side deinterlacing circuit 29 shown in FIG. 3, the input terminal 30 receives the received interlaced signal A _i-1J , and the input terminal 31 corresponds to V-. When the T helper signal α _ij is input, for example, A _i-1J in FIG. 5C is input to the input terminal 30, α _{ij in} FIG. 4D is input to the input terminal 31. , (A _i-1J + A _ij-1 + A _{ij + 1} + A _{i + 1j} ) / 4 is output from the adder 38, and therefore X = α _ij + (from the adder 39. A _i-1J + A _ij-1 + A _{ij + 1} + A _{i + 1j} ) / 4 is output from the output terminal 40 as the reproduction signal X of FIG.

This reproduced signal X is the VT helper signal 2
The horizontal low-frequency component transmitted by 15 (1.5MH _{Z hereinafter), X = α ij + (} A i-1J + A ij-1 + A ij + 1 + A i + 1j) / 4 = S ij - ((S _i-1J + S _ij-1 + S _{ij + 1} + S _{i + 1j} ) / 4)
+ (A _i-1J + A _ij-1 + A _{ij + 1} + A _{i + 1j} ) / 4, which is almost the same as the original signal S _ij .

Example 2. An embodiment of the invention of claim 2 will be described below. The overall configuration of this embodiment is similar to that of the conventional example shown in FIG. 8 in that the signal 206 that has passed through the VT pre-filter 2c is used as an input to create a helper signal.
Is different from the embodiment described above.

FIG. 6 is a block circuit diagram of the helper signal generation circuit of this embodiment. Since the circuit configuration is exactly the same as that of the embodiment shown in FIG. 2 and the input signal is different, the helper to be output is naturally. The signal 217 also has different characteristics.

Next, the operation will be described. The 525/60/60 Y signal input from the V-T pre-filter 2c is input to the V-T helper signal generator 50, and the delay circuits 9 to 12 cause the pixel signals shown in FIG. Sampling values A _i-1J , A _ij-1 , A _ij , A _{ij + 1} , A _{i + 1j} are obtained. These are input to the coefficient circuits 13 to 17 and the adder 18, and as the V-T helper signal β _ij , β _ij = A _ij − (A _i−1J + A _ij−1 + A _{ij + 1} + A _{i + 1j} ) / 4 is required. At this time, the characteristics of the pass band of the VT helper signal are similar to those in FIG.

[0032] Thus V-T helper signal 217 thus obtained is subsequently, for quadrature modulation in the same manner as the picture carrier as that shown in the prior art, the horizontal band H-LPF 6 to 1.5MH _Z Restricted and transmitted from the transmitter 7 on the current NTSC transmission line.

As a result, in the deinterlacing circuit 29 on the receiving side shown in FIG. 3, the received interlaced signal A _i-1J is input to the input terminal 30 and the corresponding V-T is input to the input terminal 31. The helper signal β _ij is input, and for example, as shown in FIG.
When A _{i-1J in} (c) is input to the input terminal 30, β _{ij in} FIG. 7 (d) is input to the input terminal 31, and the adder 38 uses the configuration shown in FIG. , (A _i-1J + A _ij-1 + A _{ij + 1} + A _{i + 1j} ) / 4 is output, so that X = β _ij + (A _i-1J + A _ij-1 + A _{ij +} ) is output from the adder 39. ₁ + A _{i + 1j} ) / 4 is output from the output terminal 40 as the reproduction signal X of FIG.

This reproduced signal X is the VT helper signal 2
The horizontal and transmitted low frequency component X _L (1.5MH _Z hereinafter) at _{17, X L = β ij +} (A i-1J + A ij-1 + A ij + 1 + A i + 1j) / 4
= A _ij , and X _H = (A _i-1J + A _ij-1 + A _{ij + 1} + A _{i + 1j} ) / 4 for the horizontal high-frequency component X _H , and the double image in the moving image is significantly larger than that in the conventional example. Is reduced to.

[0035]

As described above, according to the first aspect of the invention, the V-T helper signal of the Y signal is generated from the non-interlaced luminance signal before the V-T pre-filter is applied, and the V-T helper signal is generated.
−T helper signal band in the time vertical frequency plane is V
Since the band is cut by the -T pre-filter, the receiving side can reproduce a signal substantially equivalent to the original non-interlaced luminance signal.

According to the second aspect of the invention, the luminance signal V-
The band of the T helper signal is made to be a part that is cut off by the VT pre-filter, and when reproducing at the receiving side, when the transmitted interlaced luminance signal is returned to the non-interlaced luminance signal, an attempt is made to interpolate. Since the average value of the upper and lower scanning lines of the scanning line to be interpolated and the scanning lines of the fields before and after the scanning line to be interpolated is calculated and interpolated, V
For the luminance signal horizontal low-frequency component sent by the -T helper signal, the luminance signal after applying the VT pre-filter can be completely restored, and also for the horizontal high-frequency component, the luminance signal closer to it can be restored. You can

[Brief description of drawings]

FIG. 1 is a block circuit diagram showing a configuration of a non-interlaced TV signal transmission device according to an embodiment of the present invention.

FIG. 2 is a block circuit diagram showing a configuration of a helper signal generator in FIG.

FIG. 3 is a block circuit diagram of a deinterlacing circuit provided on the receiver side.

FIG. 4 is a diagram showing a transmission band of a VT helper signal in the embodiment of FIG.

5 is a scanning line structure diagram on the VT plane for explaining the operation of the embodiment of FIG. 1. FIG.

FIG. 6 is a block circuit diagram showing a configuration of a helper signal generator according to an embodiment of the invention of claim 2;

7 is a scanning line structure diagram on a VT plane for explaining the operation of the embodiment of FIG.

FIG. 8 is a block circuit diagram showing a configuration of a conventional non-interlaced TV signal transmission device.

FIG. 9 is a pass band characteristic diagram of a VT pre-filter.

FIG. 10 is a diagram showing a configuration of a VT pre-filter.

FIG. 11 is a block circuit diagram showing a configuration of a conventional helper signal generator.

FIG. 12 is a diagram showing a transmission band of a conventional VT helper signal.

13 is a scanning line structure diagram on the VT plane for explaining the operation of the conventional apparatus shown in FIG.

[Explanation of symbols]

2a, 2b, 2c VT pre-filter 3a, 3b, 3c interlace converter 4 encoder 6 horizontal low-pass filter 7 transmitter 9, 10, 11, 12, 31, 32, 33 delay circuit 13, 14, 15 , 16, 17, 34, 35, 36, 3
7 Coefficient circuit 18, 38, 39 Adder 29 Non-interlacing circuit 50 Helper signal generator

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] December 19, 1991

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

Non-interlaced TV signal transmission device

[Claims]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-interlaced TV signal transmission apparatus for converting a non-interlaced signal into an interlaced signal for transmission and reproducing the original non-interlaced signal on the receiving side.

[0002]

2. Description of the Related Art FIG. 8 shows, for example, IEEE TRAN.
SACTIONS ON BROADCASTING
VOL. BC-33, NO. 4 DECEMBER
1987 "Encoding for Compati"
bility and Recoverability
in the ACTY System ”(Davi
d Sarnoff Research Center
It is a block circuit diagram of the example of 1 structure of the transmission apparatus of the conventional non-interlaced TV signal shown by r).

In the figure, 1a, 1b and 1c are input terminals, and 1a has 525 non-interlaced scans per field (hereinafter, "525/60/60" or pay attention to the number of effective scanning lines "480/60". Abbreviated as "/ 60"), 1b is a 525/60/60 I signal, and 1c is a 5 signal.
The 25/60/60 Y signal is input. Q entered
The signal 201, the I signal 202, and the Y signal 203 are input to interlace converters 3a, 3b, and 3c that convert a non-interlaced signal into an interlaced signal via the VT prefilters 2a, 2b, and 2c, respectively. ,at the same time,
The output signal 206 of the VT pre-filter 2c is also input to the helper signal generator 5.

The output 207 of the interlace converter 3a is
Interlace converter 3 as first input of encoder 4
The output 208 of b is as the second input of the encoder 4,
The output 209 of the interlace conversion 3c is input as the third input of the encoder 4. The encoder 4 encodes the input Y, I, and Q signals into a signal that can be transmitted by the current NTSC system, and inputs the signal as the first input 211 of the transmitter 7.

The output 210 of the helper signal generator 5 is input to a horizontal low-pass filter (hereinafter referred to as "H-LPF"), and the VT helper signal with the horizontal band limited is output to the second side of the transmitter 7. Input 212. The transmitter 9 RF-modulates the input 211 from the encoder 4 and the VT helper signal 212 and outputs the result to the output terminal 8.

Next, the operation will be described. The V-T pre-filters 2a to 2c are band limiting filters, and the interlace converters 3a to 3c in the next stage are used to input the input signals 204, 205, 20.
6 limits the band of the input signal in order to remove the aliasing distortion that occurs when 6 is converted into the interlaced signals 207, 208, 209. For the region occupied by the input signal shown by the broken line in FIG. , The signal component in the shaded area is passed, and the signal component in the non-hatched area is removed.

FIG. 10 shows a signal of 525/60/60 as V-
In the figure represented by the T plane, the VT pre-filters 2a, 2b,
2c is a data S _ij of the pixel of interest S _ij, the data S _i-1j of one field before and after the pixel, the data _{S ij-1, S ij +} 1 of S i _{+ 1j} and 1 line above and below the pixel, For example
The calculation of the following expression for _obtaining the added value A _ij by weighting the coefficients shown in 10 and adding is performed, and the signal in which the pixel data S _ij is replaced with the added value A _ij is output. A _ij = ( S
_i-1j + S _ij-1 + 4S _ij + S _{ij + 1} + S _{i + 1j} ) / 8 Therefore, the output 20 of the VT pre-filters 2a, 2b, 2c
As shown in FIG. 13B, 4, 205, and 206 are signals in which, for example, the pixel data S _ij in FIG. 13A is replaced with the added value A _ij .

The outputs 204, 205, 206 of the VT pre-filters 2a, 2b, 2c are interlaced converters 3, respectively.
Q of 525/60/60 input to a, 3b, 3c
The signals, I signals, and Y signals are converted into 525/60/30 interlaced Q signals, I signals, and Y signals. This interlaced converted Q signal 207, I signal 208, Y
As shown in FIG. 13C, the signal 209 is a signal in which only odd lines are transmitted in a certain field and only even lines are transmitted in the next field.

The helper signal generator 5 receives the input 52
From the Y signal 206 of 5/60/60, the VT helper signal 210 for reproducing the information of the Y signal lost by the interlace conversion is generated.

FIG. 11 is a block circuit diagram of the helper signal generator 5, in which 19 and 20 are 525H delay circuits and 21 to 23.
Is a coefficient circuit, 24 is an adder, and the VT pre-filter 2c
The Y signal 206 input from the 525H delay circuit 1
9, 20 delays by 525H, the Y signal 206 is multiplied by [-1/2] in the coefficient circuit 21, and the output of the 525H delay circuit 19 is multiplied by [1] in the coefficient circuit 22 to obtain 525.
The output of the delay circuit 20 is multiplied by [-1/2] in the coefficient circuit 23, and the signals multiplied by these coefficients are added by the adder 24 to output the VT helper signal 210.

The V-T helper signal 210 is obtained by calculating the pixel data lost by the interlace conversion of the Y signal from the output of the V-T pre-filter 2c by the following formula. α _ij = A _ij − ( A _i−1j + A _{i + 1j} ) / 2, that is, data lost by the interlace conversion, for example, FIG.
The information of the sum A _ij in (b), the average value of one field before and after addition value A _i-1j and A _{i + 1j,} demold the difference between the sum value A _ij as alpha _ij, the data Is transmitted,
For example, David Sarnoff Research
In hCenter, the image carrier is orthogonally modulated and transmitted. The frequency band of the V-T helper signal 210 is the portion shown by the hatched portion in FIG.

The interlaced Q signal 207, I signal 208, and Y signal 209 are input to the encoder 4 and encoded into signals that can be transmitted on the current NTSC transmission line.
It is input to the transmitter 7. On the other hand, V-T helper signal 21
0 is horizontal 1.5 MH for quadrature modulation to video carrier
After passing through the H-LPF 6 of _Z , its output 212 is input to the transmitter 7 and output as a signal 213 that can be transmitted on the current NTSC transmission line.

[0013]

In the conventional non-interlaced signal transmission apparatus, the V-T prefilter is used to limit the band of the Y signal to the shaded area in FIG. 9 in order to compensate for this missing portion. Since the V-T helper signal transmitted to the H.264 signal is a signal component in the shaded area in FIG. 12, there is a problem that the original signal component surrounded by the broken line in FIG. 9 cannot be completely reproduced. It was

That is, as shown in FIG. 13E, the horizontal low-frequency component _XL and the horizontal high-frequency component XL of the pixel X reproduced into the non-interlaced signal by using the VT helper signal on the receiving side. Each _H is expressed by the following equation and does not become the original data S _ij . _{X L = α ij + (A} i-1j + A i + 1j)
/ 2X _H = ( A _i-1j + A _{i + 1j} ) / 2

The present invention has been made to solve the above problems, and a non-interlaced signal capable of almost completely reproducing the horizontal low frequency component of the Y signal on the receiving side to the original signal. The purpose is to obtain a transmission device.

[0016]

According to a first aspect of the present invention, there is provided a non-interlaced TV signal transmission device for a scanning line which is not transmitted by being converted into an interlaced signal of an input non-interlaced Y signal. From the pixel data S _ij , the upper and lower pixel data S _ij-1 , S _{ij + 1} and the pixel data S _i-1j , S _{i + 1j} of the fields before and after it, the following expression α _ij = S _ij − ( S _{i- 1j} + S _ij-1 + S _{ij + 1} + S _{i + 1j} ) /
4, a means for creating a VT helper signal of the scanning line which is not transmitted, and a non-interlaced Y on the receiving side.
When reproducing the signal, the pixel data X of the scanning line to be interpolated is
The following formula X = α _ij + ( A _i-1j + A _ij-1 + A _{ij + 1} + A _{i + 1j} ) /
4 is provided and means for interpolating and interpolating.

Non-interlaced T according to the invention of claim 2
The V signal transmission device converts a non-interlaced Y signal of the input non-interlaced Y signal into a non-transmission VT helper signal of a scanning line whose band is limited by a VT prefilter. Pixel data A _ij (= of the scanning line not transmitted of the interlaced Y signal)
( S _i-1j + S _ij-1 + 4S _ij + S _{ij + 1} + S _{i + 1j} ) / 8),
From the upper and lower pixel data A _ij-1 , A _{ij + 1} and the pixel data A _i-1j and A _{i + 1j of the fields} before and after it, the following equation β _ij =
_VT helper signal generating means for generating the VT helper signal of the scan line which is not transmitted based on A _ij − ( A _i−1j + A _ij−1 + A _{ij + 1} + A _{i + 1j} ) / 4, and reception. When reproducing the non-interlaced Y signal on the side, the pixel data X of the scanning line to be interpolated is expressed by the following equation X = β _ij + ( A _i-1j + A _ij-1 + A
_{ij + 1} + A _{i + 1j} ) / 4, and means for interpolating a scan line that has not been transmitted.

[0018]

According to the present invention, the _VT helper signals α _ij and β _ij produced by the VT helper signal producing means are converted from non-interlaced signals to interlaced signals. It contains the information of the pixel data of the scanning line of the Y signal which is not transmitted. For this reason,
When converting the pixel data of the scanning line to be interpolated using the transmitted VT helper signal when converting to the non-interlaced signal on the receiving side, the non-interlaced Y signal which is almost the same as the non-transmitted scanning line is calculated. Can be played.

[0019]

EXAMPLES Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block circuit diagram of this embodiment. The same parts as those in the conventional example of FIG. In the figure, 50 is a helper signal generator, which creates a VT helper signal 214 from a Y signal of 525/60/60 input from the input terminal 1c, and the created helper signal 214 is sent to the H-LPF 6. Is entered.

FIG. 2 is a block circuit diagram of the helper signal generator 50. In the figure, 9 is a delay circuit, which delays the Y signal input from the input terminal 1c by 524H.
A 1H delay circuit 10 delays the output of the delay circuit 9 by 1H. Reference numeral 11 denotes a second 1H delay circuit 1H delay circuit 1
The output of 0 is further delayed by 1H. 12 is the second 52
The 4H delay circuit delays the output of the 1H delay circuit 11 by 524H. 13 to 17 have predetermined coefficients [-1 /
4], [-1/4], [1], [-1/4], [-1 /
4] is added to the coefficient circuit, and 18 is an adder for adding the outputs of the coefficient circuits 13 to 17.

FIG. 3 is a diagram showing a deinterlacing circuit on the receiver side. In the figure, 30 is a terminal to which the received interlaced signal is input, 41 is a terminal to which the received VT helper signal is input, 31 is a delay circuit that delays the signal input from the input terminal 30 by 524H, 32 is a delay circuit that delays the output of the delay circuit 31 by 2H, 33 is a delay circuit that delays the output of 32 by 524H, and 34 to 37 are the input terminal 30 and the delay circuit 3.
A coefficient circuit for multiplying the outputs of 1, 32 and 33 by a predetermined coefficient, 38 is an adder for adding the outputs from the coefficient circuits 34 to 37, and 39 is a signal output from the adder 38 to the signal input from the delay circuit 31. An adder 40 for adding the generated signals is an output terminal of the signal output from the adder 39.

Next, the operation will be described. Input terminal 1
The I and Q signals input from a and 1b are the same as those in the conventional example, and therefore the description thereof is omitted.

525/60 input from the input terminal 1c
The Y signal of / 60 is input to the VT pre-filter 2c and band-limited, and is also input to the helper signal generator 50. From the Y signal of 525/60/60 shown in FIG. The _VT helper signal α _ij shown in d) is _generated . For example, focusing on the scanning line S _ij in FIG. 5A, the scanning line V-T helper signal α _ij is α _ij = S _ij − ( S
_i-1j + S _ij-1 + S _{ij + 1} + S _{i + 1j} ) / 4, and the characteristics of the pass band of the VT helper signal at this time are as shown in FIG.

Therefore, according to this embodiment, the signal component lost by applying the VT pre-filter 2c from the entire band (the area surrounded by the broken line in FIG. 9) having the original non-interlaced signal. Will be sent with the V-T helper signal 215.

525/60 by the interlace converter 3c
The Y signal converted from / 60 to 525/60/30 is
525 / output from interlace converters 3a and 3b
The 60/30 I signal and Q signal are input to the encoder 4, and become a signal that can be transmitted by the current NTSC transmitter, and are input to the transmitter 7.

On the other hand, the VT helper signal 214 generated by the helper signal generator 50 is 1.5 in H-LPF6.
After being band-limited to MH _Z , it is input to the transmitter 7, quadrature-modulated to a video carrier, and output as a signal that can be transmitted on the current NTSC transmission line.

As a result, in the deinterlacing circuit 29 on the receiving side shown in FIG. 3, the input terminal 30 receives the received interlaced signal A _i-1j and the input terminal 41 corresponds to V-. When the T helper signal α _ij is input and, for example, A _i-1j in FIG. 5 (c) is input to the input terminal 30, α _{ij in} FIG. 5 (d) is input to the input terminal 41 . , From the adder 38 to ( A _i-1j + A _ij-1 +
Since A _{ij + 1} + A _{i + 1j} ) / 4 is output, X = α _ij + ( A _i-1j + A _ij-1 + A _{ij + 1} + A _{i + 1j} ) is output from the adder 39.
/ 4 is output from the output terminal 40 as the reproduction signal X of FIG.

This reproduced signal X is the VT helper signal 2
The horizontal low-frequency component transmitted by 15 (1.5MH _{Z hereinafter), X = α ij + (} A i-1j + A ij-1 + A ij + 1 +
A _{i + 1j} ) / 4 = S _ij − (( S _i-1j + S _ij-1 + S _{ij + 1} + S
_{i + 1j} ) / 4) + ( _Ai-1j + _Aij-1 + _{Aij + 1 + Ai + 1j} ) /
4, which is almost the same as the original signal S _ij .

Example 2. An embodiment of the invention of claim 2 will be described below. The overall configuration of this embodiment is similar to that of the conventional example shown in FIG. 8 in that the signal 206 that has passed through the VT pre-filter 2c is used as an input to create a helper signal.
Is different from the embodiment described above.

FIG. 6 is a block circuit diagram of the helper signal generation circuit of this embodiment. Since the circuit configuration is exactly the same as that of the embodiment shown in FIG. 2 and the input signal is different, the helper to be output is naturally. The signal 217 also has different characteristics.

Next, the operation will be described. Y signal 525/60/60 which is output from the V-T prefilter 2c is inputted to V-T helper signal generator 50, a delay circuit 9-12, as shown in FIG. 7 (b) pixels Sampling values A _i-1j , A _ij-1 , A _ij , A _{ij + 1} , A _{i + 1j} are obtained. These are input to the coefficient circuits 13 to 17 and the adder 18, and as the VT helper signal β _ij , β _ij
= _Aij- ( _Ai-1j + _Aij-1 + _{Aij + 1 + Ai + 1j} ) / 4 is obtained. At this time, the characteristics of the pass band of the VT helper signal are similar to those in FIG.

[0032] Thus V-T helper signal 217 thus obtained is subsequently, for quadrature modulation in the same manner as the picture carrier as that shown in the prior art, the horizontal band H-LPF 6 to 1.5MH _Z Restricted and transmitted from the transmitter 7 on the current NTSC transmission line.

As a result, in the deinterlacing circuit 29 on the receiving side shown in FIG. 3, the received interlaced signal A _i-1j is input to the input terminal 30 and the corresponding V-T is input to the input terminal 41. The helper signal β _ij is input, and for example, as shown in FIG.
When A _{i-1j in} (c) is input to the input terminal 30, β _{ij in} FIG. 7 (d) is input to the input terminal 41 , and the adder 38 uses the configuration shown in FIG. , ( A _i-1j + A _ij-1
Since + A _{ij + 1} + A _{i + 1j} ) / 4 is output, the adder 39
From, X = β _ij + ( A _i-1j + A _ij-1 + A _{ij + 1} +
A _{i + 1j)} / 4 is outputted from the output terminal 40 as a reproduced signal X of FIG. 7 (e).

This reproduced signal X is the VT helper signal 2
The horizontal and transmitted low frequency component X _L (1.5MH _Z hereinafter) at _{17, X L = β ij +} (A i-1j + A ij-1 + A ij + 1
+ A _{i + 1j} ) / 4 = A _ij , and for the horizontal high-frequency component X _H , X _H = ( A _i-1j + A _ij-1 + A _{ij + 1} + A _{i + 1j} ) / 4, which is a double image in a moving image. Is significantly reduced compared to the conventional example.

[0035]

As described above, according to the first aspect of the invention, the V-T helper signal of the Y signal is generated from the non-interlaced luminance signal before the V-T pre-filter is applied, and the V-T helper signal is generated.
−T helper signal band in the time vertical frequency plane is V
Since the band is cut by the -T pre-filter, the receiving side can reproduce a signal substantially equivalent to the original non-interlaced luminance signal.

According to the second aspect of the invention, the luminance signal V-
The band of the T helper signal is made to be a part that is cut off by the VT pre-filter, and when reproducing at the receiving side, when the transmitted interlaced luminance signal is returned to the non-interlaced luminance signal, an attempt is made to interpolate. Since the average value of the upper and lower scanning lines of the scanning line to be interpolated and the scanning lines of the fields before and after the scanning line to be interpolated is calculated and interpolated, V
For the luminance signal horizontal low-frequency component sent by the -T helper signal, the luminance signal after applying the VT pre-filter can be completely restored, and also for the horizontal high-frequency component, the luminance signal closer to it can be restored. You can

[Brief description of drawings]

FIG. 1 is a block circuit diagram showing a configuration of a non-interlaced TV signal transmission device according to an embodiment of the present invention.

FIG. 2 is a block circuit diagram showing a configuration of a helper signal generator in FIG.

FIG. 3 is a block circuit diagram of a deinterlacing circuit provided on the receiver side.

FIG. 4 is a diagram showing a transmission band of a VT helper signal in the embodiment of FIG.

5 is a scanning line structure diagram on the VT plane for explaining the operation of the embodiment of FIG. 1. FIG.

FIG. 6 is a block circuit diagram showing a configuration of a helper signal generator according to an embodiment of the invention of claim 2;

7 is a scanning line structure diagram on a VT plane for explaining the operation of the embodiment of FIG.

FIG. 8 is a block circuit diagram showing a configuration of a conventional non-interlaced TV signal transmission device.

FIG. 9 is a pass band characteristic diagram of a VT pre-filter.

FIG. 10 is a diagram showing a configuration of a VT pre-filter.

FIG. 11 is a block circuit diagram showing a configuration of a conventional helper signal generator.

FIG. 12 is a diagram showing a transmission band of a conventional VT helper signal.

13 is a scanning line structure diagram on the VT plane for explaining the operation of the conventional apparatus shown in FIG.

[Description of Reference Signs] 2a, 2b, 2c VT pre-filters 3a, 3b, 3
c Interlace converter 4 Encoder 6 Horizontal low-pass filter 7 Transmitter 9, 10, 11, 12, 31, 3
2, 33 delay circuits 13, 14, 15, 16, 17, 3
4, 35, 36, 37 Coefficient circuit 18, 38, 39 Adder 29 Non-interlacing circuit 50 Helper signal generator

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Claims (2)

[Claims] 1. An I signal and a Q of a non-interlaced TV signal.
The signal and the Y signal are respectively converted through a VT pre-filter to remove a component that causes aliasing distortion at the time of interlacing, and then converted into an interlaced TV signal.
A VT helper signal containing pixel data of scanning lines that is not transmitted due to interlacing of the signal is created and transmitted together with the interlaced TV signal, and a Y signal is generated based on the VT helper signal reproduced by the receiving side. In a non-interlaced TV signal transmission device configured to create pixel data of scanning lines to be interpolated during non-interlaced scanning, scanning that is not transmitted from an input non-interlaced Y signal during interlaced processing From the pixel data S _{ij of the} line, the pixel data S _ij−1 , S _{ij + 1 above} and below it and the pixel data S _i-1J , S _{i + 1 j} of the fields before and after it, the following expression α = S _ij − (S _{i -1J} + S _ij-1 + S _{ij + 1} + S _{i + 1j} ) / 4
Based on the above, means for creating the VT helper signal of the scanning line which is not transmitted and the pixel data X of the scanning line to be interpolated when the non-interlaced Y signal is reproduced on the receiving side are expressed by the following formula X = α _ij + (A _i-1J + A _ij-1 + A _{ij + 1} + A _{i + 1j} ) / 4
A non-interlaced TV signal transmission device, characterized by comprising: 2. The pixel data A _ij (= (of a scanning line which is not transmitted when interlacing a Y signal that has passed through a VT prefilter by a means for creating a VT helper signal according to claim 1. S _i-1J + S _ij-1 + 4S _ij + S _{ij + 1} +
S _{i + 1j} ) / 8, the pixel data A _{ij −1} , A _{ij +1 above it,} and the pixel data A _{i −1J} , A _{i + 1j} of the fields before and after that, β _ij = A _ij − ( A _i-1J + A _ij-1 + A _{ij + 1} + A
_{i + 1j} ) / 4 is used to create the VT helper signal for the non-transmitted scanning line, and means for creating the pixel data X to be interpolated on the receiving side is expressed by the following formula X = β _ij
A non-interlaced TV signal transmission device, which creates pixel data of a scanning line to be interpolated based on + (A _i-1J + A _ij-1 + A _{ij + 1} + A _{i + 1j} ) / 4.