JP3525959B2 - Signal separation device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal separation device for television signals, and more particularly to a signal separation device suitable for television signals including high definition television signals compatible with current television signals.

[0002]

2. Description of the Related Art In recent years, a high definition television signal system (second generation EDTV system) which is completely compatible with the current broadcasting system NTSC system has been proposed. Second generation ED
In the TV system, the horizontal luminance signal is reinforced in order to improve the horizontal luminance resolution and increase the definition of the image. That is,
In the high definition television signal system, a frequency component higher than the transmission band (0 to 4.2 MHz) of the luminance signal, for example, 4.
The horizontal high-definition signal of 2 to about 6 MHz is frequency-converted (shifted) to transmit the high-definition television signal multiplexed in the transmission band. The high-definition information inserted in such a composite color television signal is one of the characteristics of the second-generation EDTV system, and hereinafter, the multiplexed horizontal high-definition signal is simply referred to as an HH signal.

FIGS. 13 (a) to 13 (c) are diagrams showing a three-dimensional frequency spectrum distribution of a high definition television signal in which HH signals are multiplexed. In FIGS. 13A to 13C, the μ axis indicates the horizontal frequency axis, the ν axis indicates the vertical frequency axis, the f axis indicates the time direction frequency axis, and Y indicates the luminance signal.
C represents a color signal. 13 (a) is a diagram of the three-dimensional frequency space seen from an oblique direction, FIG. 13 (b) is a projection diagram from the positive direction of the μ axis to the [f−ν] plane, and FIG. 13 (c).
Is a frequency distribution chart on the μ axis.

Generally, in a three-dimensional frequency space, the frequency spectra of the luminance signal, the color signal, and the HH signal are in the time direction when the motion of the image is large, and in the vertical direction and the horizontal direction when there is a fine pattern in the vertical direction. If there is a fine pattern on the side, it will spread horizontally. In FIG. 13 (b),
When the luminance signal, the color signal, and the HH signal spread in the time direction or the vertical direction, crosstalk between the signals may occur. Therefore, it is recommended that the Y signal, the C signal, and the HH signal be subjected to pre-combing on the transmission side, in which components interfering with each other are removed in advance.

In a device for receiving a high-definition television signal in which HH signals are multiplexed, in order to reproduce the signals,
The transmitted high-definition television signal is a Y signal, a C signal,
A signal separation device for separating the HH signal is required. As described above, since the Y signal, the C signal, and the HH signal are distributed on the [f-ν] plane as shown in FIG. 13B, in order to accurately separate the signals, the time domain or vertical A signal separating means by calculation in the area is adopted. As an example of this, Japanese Patent Laid-Open No. 06-038236 is disclosed.

FIG. 15 is a diagram showing the operation of the conventional signal separation device disclosed in Japanese Patent Laid-Open No. 06-038236. Each of FIGS. 15 (a1) to (c1) is a diagram showing a two-dimensional space-time composed of the y-axis and the t-axis, where the vertical direction of the screen is the y-axis and the time direction is the t-axis. ○ indicates that interlaced scanning is performed. 15 (a1) to (a3)
Is an operation for obtaining the Y signal, FIG. 15 (b1) to (b3)
Is an operation for obtaining a C signal, and FIG. 15C1 is an operation for obtaining an HH signal. Weighted addition is performed using the coefficients shown on the right of the black circles to obtain Y, HH, and C signal components.

FIG. 19 is a block diagram showing a configuration of a conventional signal separation device. In the figure, an input composite color television signal 101 is composed of 262 line delay circuits 1 and 8, 1.
The line delay circuits 2 and 4 and 5 and 7 and the 261 line delay circuits 3 and 6 delay a maximum of 1050 lines. With respect to the delayed signal and the input signal 101, the motion of the image is detected by the motion detection circuit 12 by the correlation between the sample points separated by one frame or two frames. In addition, the Y extraction circuit 3
7, C extraction circuit 38, and HH extraction circuit 39.
The weighted addition shown in (a1) to (c1) is performed.

FIG. 20 is a block diagram showing the configuration of the Y extraction circuit 37 in the conventional signal separation circuit. In the figure, a first Y extraction filter 40 is a filter performing the operation of FIG. 15 (a1), a second Y extraction filter 41 is a filter performing the operation of FIG. 15 (a2), and a third Y extraction filter 42. Is a filter that performs the operation of FIG.

FIG. 21 is a block diagram showing the structure of a C extraction circuit 38 in a conventional signal separation circuit. In the figure, a first C extraction filter 44 is a filter that performs the operation of FIG. 15 (b1), a second C extraction filter 45 is a filter that performs the operation of FIG. 15 (b2), and a third C extraction filter 46. Is a filter that performs the operation of FIG.

FIG. 22 shows HH in the conventional signal separation circuit.
It is a block diagram showing a configuration of an extraction circuit 39. The HH extraction filter 48 is a filter that performs the operation of FIG.

FIGS. 16A and 16B are characteristic diagrams on the [f-ν] plane of the Y signal extracted by the first Y extraction filter 40, which are obtained by the operation of FIG. 15 (a1). To be 17A to 17C show the first C extraction filter 4
It is a characteristic on the [f-ν] plane of the C signal extracted by 4 and is obtained by the operation of FIG. 15 (b1). FIG.
15A to 15C are characteristics on the [f-ν] plane of the HH signal extracted by the HH extraction filter 48, and FIG.
It is obtained by the operation of (c1).

According to FIGS. 16 to 18, when the first Y extraction filter 40, the first C extraction filter 44, and the HH extraction filter 48 are used, the time frequency pass band is narrow and the vertical frequency pass band is wide. Therefore, it is suitable for signal separation of still images. On the other hand, the third Y extraction filter 42, the third C
The extraction filter 46 has a wide time-frequency pass band and a narrow vertical frequency pass band (not shown), and is therefore suitable for video signal separation. In addition, the second Y extraction filter 4
The first and second C extraction filters 45 have intermediate characteristics. Therefore, the outputs of the Y extraction filters 40 to 42, the C extraction filters 44 to 46, and the HH extraction filter 48 are mixed and controlled by the output 105 of the motion detection circuit 12, and the Y signal 102 and the C signal 103 suitable for the motion of the image. , HH signal 104 is obtained.

On the other hand, the amount of motion detected by the motion detecting circuit 12 is represented by a motion coefficient signal in the form of, for example, a motion coefficient k (0≤k≤1), and for example, the image is determined to be a complete still image. In this case, the motion coefficient signal is controlled such that k = 0, and when the image is determined to be a complete moving image, k = 1.

Generally, when the image is an image with a small amount of motion such as a still image (0≤k <α, where 0 <α <1), the mixing circuit 43 of the Y extraction circuit shown in FIG.
The Y extraction filters 40 to 42 are controlled to increase the mixing ratio of the outputs of the first Y extraction filter 40 and decrease the mixing ratio of the outputs of the second and third Y extraction filters 41 and 42.

When the amount of motion of the image is moderate (α≤k
≦ β, where 0 <α <β <1), the mixing circuit 43 increases the mixing ratio of the outputs of the second Y extraction filter 41 and outputs the outputs of the first and third Y extraction filters 40 and 42. The mixing ratio is controlled to be small.

When the amount of movement of the image is large (β <k ≦ 1)
In the mixing circuit 43, the third Y extraction filter 4
It is controlled so that the mixture ratio of the outputs of the second Y and the second Y extraction filters 40 and 41 is increased.

Also in the mixing circuit 47 of the C extraction circuit shown in FIG. 21, similarly, the mixing ratio of the outputs of the C extraction filters 44 to 46 is controlled by the amount of movement of the image, and the C signal is extracted. In the HH extraction circuit shown in FIG. 22, the output of the HH extraction filter 48 is multiplied by (1-k) by the multiplication circuit 16 and the conversion circuit 17 so that the HH is obtained only when the amount of motion of the image is small.
The signal 104 is output.

That is, when the amount of motion of the image is small, the motion signal 105 is shown in FIGS. 15 (a1), (b1), and (c1).
When the Y signal, the C signal, and the HH signal are extracted by the calculation shown in FIG.
By the calculations shown in (a2) and (b2), the Y signal,
When the C signal is extracted and the amount of motion is large, FIG.
3), each signal extraction circuit is controlled so as to extract the Y signal and the C signal by the operations shown in (b3).

[0019]

14 (a) to 14 (c).
FIG. 4 is a spectrum distribution diagram of Y signal, C signal, and HH signal when an image is stationary in a three-dimensional frequency space. In the figure, when Y, HH, and C have vertical frequency high-frequency components,
The frequency spectrum has a spread in the vertical frequency direction. In the signal separation circuit of the conventional example, the frequency domain shown in FIGS. 17A to 17C is extracted as C, and the frequency domain shown in FIGS.
The frequency region shown in (c) is extracted as HH. FIG. 17
According to (b), at f = 15 Hz, 0 cph, 5
The gain is halved near 25/2 cph. On the other hand, if the HH signal is spread in the vertical frequency direction, f
= 15 Hz, as shown in FIG.
There is HH up to around 0 cph around 25/4 cph, and a maximum of about 1/2 of such HH component is demodulated as C. Similarly, according to FIG.
C having a spread in the vertical frequency direction is reproduced as HH.

When the C signal and the HH signal spread in the vertical frequency direction as described above, there is a problem that components that cannot be removed by the filter leak into each other and crosstalk occurs.

The present invention has been made in order to solve the above-mentioned problems, and has a C signal having a wide vertical frequency component, HH.
The purpose is to separate signals without crosstalk.
That is, it is an object of the present invention to obtain a signal separation device capable of accurately performing signal separation when HH signals are multiplexed and reproducing a clear image with little deterioration in image quality.

[0022]

A signal separating apparatus according to claim 1 of the present invention is a horizontal high-definition signal (hereinafter referred to as HH signal).
A composite color television signal (high)
From a high-definition television signal) to a luminance signal and a color signal and
In a signal separation device that separates HH signals,
Is an identification control signal that identifies information related to
-Decodes signals transmitted by being multiplexed with television signals
Identification control signal decoding means and an input composite color television
The first 262 lines that delay the synchronization signal by 262 lines.
Output signal from the first 262 line delay circuit
A first one-line delay circuit for delaying one line, and a first
1 line delay circuit output signal is delayed by 261 lines
First 261 line delay circuit and first 261 line
Second delay line delaying the output signal of the delay circuit by one line
1 delay circuit and the output signal of the second 1-line delay circuit
A third 1-line delay circuit for delaying in and a third 1-line delay circuit
Line delay circuit delays the output signal by 261 lines
Second 261 line delay circuit and second 261 line delay
A fourth one-line delay for delaying the circuit output signal by one line
The output signal of the delay circuit and the fourth 1-line delay circuit
A second 262 line delay circuit for delaying by IN, and
Input composite color television signal and line delay circuit
Multiply each of the output signals of
Color signal extraction means for extracting a color signal by
Force composite color television signal and line delay circuit
Multiply a given coefficient for each of the output signals and add
HH signal extraction means for extracting the HH signal by
Multiple composite color TVs with 4 field time differences
Luminance signal extraction file that performs calculation between frames
Color signal from a color filter or composite color television signal.
And the luminance signal is obtained by the subtraction circuit that subtracts the HH signal
Luminance signal extraction means and the composite color television signal
Of the amount of motion of the HH signal
Motion detection means for controlling the output of the extraction means,
The above-mentioned place used when adding in the color signal extraction means
A constant coefficient for the input composite color television signal
Is -0.083, which corresponds to the output of the first 262 line delay circuit.
0.125 for the output of the first 1-line delay circuit
-0.125, the first 261 line delay circuit output
About -0.083, the output of the second 1-line delay circuit
About 0.165, the output of the third 1-line delay circuit
-0.083, second 261 line delay circuit output
About -0.125, the output of the fourth 1-line delay circuit
About 0.125, the second 262 line delay circuit output
The force is set to -0.083, and the HH signal extraction means is used.
Enter the above specified coefficient used when adding in
-0.1 for input composite color television signals,
The output of the 262 line delay circuit of 1 is -0.1,
The output of the 1-line delay circuit of 1 is -0.15, the first
The output of the 261 line delay circuit is -0.05,
0.2 for the 1-line delay circuit output of 2 and 1 for the third
-0.05 for the line delay circuit output, the second 26
1 line delay circuit output is 0.15
The output of the in-delay circuit is -0.1, and the second 262
The in-delay circuit output is set to -0.1
And

A signal separation device according to claim 2 of the present invention is
Horizontal high-definition signal (hereinafter referred to as HH signal) is multiplexed
Composite color television signal (high-definition television
Signal, the luminance signal, the color signal, and the HH signal are separated.
Identification of input signal information in a signal separation device
Is an identification control signal for the composite color television signal.
Identification control signal that decodes the signal multiplexed and transmitted
Decoding means and input composite color television signal 262
A first 262 line delay circuit for delaying a line,
1 262 line delay circuit Output signal delayed by 1 line
A first 1-line delay circuit and a first 1-line delay circuit
The first 261 line delaying the line output signal by 261 lines.
In delay circuit and first 261 line delay circuit output signal
A second one-line delay circuit for delaying
2 1 line delay circuit Delay the output signal by 1 line
Outputting the third 1-line delay circuit and the third 1-line delay circuit
Second 261 line delaying the force signal by 261 lines
The delay circuit and the output signal of the second 261 line delay circuit are set to 1
A fourth one-line delay circuit for delaying the line, and a fourth
1 line delay circuit Delay the output signal by 262 lines
A second 262 line delay circuit and the input composite color
Revision signal and that of the output signal of the line delay circuit
Color signals can be obtained by multiplying and adding a predetermined coefficient for each.
And a first color signal extracting means for extracting
-Of the television signal and the output signal of the line delay circuit
Color is obtained by multiplying and adding a predetermined coefficient for each
Second color signal extracting means for extracting a signal, and the input composite
Color television signal and line delay circuit output signal
Multiply each coefficient by a predetermined coefficient and add
A first HH signal extracting means for extracting an HH signal with
Input composite color television signal and line delay circuit
Multiply each of the output signals of
Second HH signal extraction means for extracting an HH signal by performing
And multiple composite colors with a time difference of up to 4 fields
Luminance signal for performing calculations between television signal frames
Extraction filter or composite color television signal
The luminance signal is subtracted from the color signal and HH signal from the
And a composite color television
Luminance signal extraction means and
Motion detection means for controlling the output of the HH signal extraction means,
Equipped with vertical edge detection means for detecting vertical high frequency components of the image
When adding in the first color signal extraction means
The above predetermined coefficient used for
Signal is -0.083, the first 262 line delay
0.125 for delay circuit output, 1st line delay
-0.125 for circuit output, first 261 line
Delay circuit output is -0.083, second 1 line
The output of the delay circuit is 0.165, and the delay of the third one line
-0.083 for the extended circuit output, the second 261 lines
The output of the delay circuit is -0.125.
The output of the delay circuit is 0.125, and the second 262
The output of the in-delay circuit is -0.083, and
When using when adding in the color signal extraction means of 2
The specified coefficient is applied to the input composite color television signal.
, -0.1, to the output of the first 262 line delay circuit.
0.15, the first 1-line delay circuit output
-0.1, for the output of the first 261 line delay circuit
Is -0.05, and for the second 1-line delay circuit output,
0.2, and −0.
05, about the output of the second 261 line delay circuit-
0.1, 0.1 for the fourth 1-line delay circuit output
5, the second 262 line delay circuit output is -0.
1, and the first HH signal extraction means performs addition.
The above specified coefficient used when
-0.1 for the vision signal, the first 262 line
-0.1 for delay circuit output, 1st line delay
The circuit output is -0.15, and the first 261 lines are delayed.
-0.05 for delay circuit output, second 1 line delay
The circuit output is 0.2, and the output from the third 1-line delay circuit
-0.05 for power, second 261 line delay circuit
Output is 0.15, 4th 1 line delay circuit output
About -0.1, second 262 line delay circuit output
Is -0.1, and the second HH signal extraction means
Enter the above specified coefficient used when adding in
-0.08 for composite color television signals
3, the output of the first 262 line delay circuit is -0.
125, 0.1 for the first 1-line delay circuit output
25, the output of the first 261 line delay circuit is −
0.083, for the second 1-line delay circuit output
0.165, for the third 1-line delay circuit output-
0.083, about the output of the second 261 line delay circuit
Is 0.125, and the fourth 1-line delay circuit output is
-0.125, for the second 262 line delay circuit output
Is -0.083, and the vertical edge detection means
If a vertical high frequency component is detected, it is output as a color signal.
Note that the output signal of the second color signal extraction means is the HH signal.
The output signal of the second HH signal extraction means is selected, and
Straight edge detection means that there is no vertical high frequency component
If the color signal is generated, the first color signal extracting means is used as the color signal.
The first HH signal extraction using the output signal of
Characterized by selecting the output signal of the means

[0024]

A signal separating apparatus according to claim 4 of the present invention is
The signal processing apparatus according to claim 1, further comprising vertical edge detecting means for detecting a vertical frequency high frequency component of the image, and when the vertical edge detecting means detects a vertical high frequency component, a color signal extraction filter. The color signal extracting means and the HH signal extracting means are controlled so that the vertical pass band of the HH signal extraction filter is narrowed and the vertical pass band of the HH signal extraction filter is narrowed.

[0026]

The signal separating apparatus according to claim 3 of the present invention is
The discrimination control signal decoding means according to claim 1 does not control the output of the HH signal extraction filter based on the output result of the motion detecting means when it is determined that the input signal is precombed. .

[0028]

In the signal separating apparatus according to the first aspect of the present invention, the HH signal extraction means and the C signal extraction means extract the HH signal extraction filter and the C signal extraction of the composite color television signal in which the HH signals are multiplexed. Since the overlapping of the extraction areas of the filters is reduced, it is possible to reduce the image quality deterioration due to the crosstalk between the HH signal and the C signal.

Further , the C signal extraction means makes the cutoff characteristic of the C signal extraction filter for obtaining the C signal from the composite color television signal in which the HH signal is multiplexed to be steep, and makes the HH signal
Since the amount of the signal entering the pass band of the C signal extraction filter is reduced, it is possible to reduce the image quality deterioration due to the HH signal leaking into the C signal band.

In the signal separation device according to the second aspect of the present invention, in addition to the above-mentioned operation, the HH signal extraction means is
The HH signal extraction filter that obtains the HH signal from the composite color television signal in which the signals are multiplexed has a sharp cutoff characteristic to reduce the amount of the C signal entering the pass band of the HH signal extraction filter. It is possible to reduce image quality deterioration due to leakage into the HH signal band.

Further, when the vertical edge detecting circuit determines that the vertical edge component of the composite color television signal in which the HH signal is multiplexed is the vertical edge component of the Y signal , the vertical edge detecting circuit detects the HH signal and the C signal. Since the pass band of the HH signal extraction filter is narrowed in the vertical frequency direction and the pass band of the C signal extraction filter is widened in the vertical frequency direction by switching the signal extraction region, the C signal leaks into the HH signal band. Image quality deterioration can be reduced.

[0032]

In the signal separating apparatus according to claim 3 of the present invention, the signal separating circuit moves when it is determined by the output of the identification control signal decoding circuit that the input signal is precombed. Since the HH signal is reproduced regardless of the detection result, it is not affected by the accuracy of motion detection.

[0034]

【Example】

Example 1. FIG. 1 is a diagram showing the operation of the signal separation circuit according to the first embodiment of the present invention. In the figure, (a) shows an operation for extracting the Y signal when the image is stationary, (b) shows an operation for extracting the C signal, and (c) shows an operation for extracting the HH signal. The frequency bands of the C signal and the HH signal extracted by the operations shown in FIGS. 1B and 1C are shown in FIGS. 4 and 5, respectively. As shown in FIGS. 4B and 4C, the gain of the C signal extraction filter that performs this operation in the region where the HH signal exists is 20% or less at the maximum. Further, from FIGS. 5B and 5C, H
The maximum gain of the H signal extraction filter in the region where the C signal exists is 30% or less. Further, since the filter coefficients shown in FIGS. 1B and 1C can be realized by multiplying the bit shift of the signal and the addition result thereof by a certain value, the circuit scale can be suppressed.

1 (b) and 1 (c), calculation on the vertical-time plane is performed, and a horizontal band pass filter (hereinafter BP) is used.
Since the band is limited in F), the band is also limited in the μ-axis direction. Since the operation of extracting the Y signal when the image is stationary is the same as that of the conventional example shown in FIG. 15 (a1), its pass band is shown in FIGS. 16 (a) and 16 (b).

In general, the effect of the HH signal appears remarkably when the image is stationary, and is inconspicuous when the image is moving. Therefore, HH
The pass band in the time-frequency direction of the signal extraction filter is narrowed. On the other hand, since the C signal is indispensable for image reproduction regardless of whether it is a still image or a moving image, the pass band is widened in the time-frequency direction. That is, the characteristics of the pass band of the filter are changed depending on whether it is the HH signal or the C signal, and the signal separation is performed while suppressing the amount of the HH and C components spread in the vertical direction leaking into the mutual regions.

FIG. 8 is a block diagram showing a configuration example of the signal separation circuit of the first embodiment. In the figure, the Y extraction filter 9
Is a filter that performs the operation of FIG.
Reference numeral 0 is a filter that performs the operation of FIG. 1B, and HH extraction filter 11 is a filter that performs the operation of FIG.

C extraction filter 10 and HH extraction filter 1
The C signal 103 and the HH signal 104 obtained by 1 are added by the adding circuit 15 and then subtracted from the input composite color television signal 101 by the subtracting circuit 13 to obtain C
And the components excluding HH are obtained.

The output of the subtraction circuit 13 and the output of the Y extraction filter 9 are input to the mixing circuit 14, and the output 105 of the motion detection circuit 12 causes the calculation by the following equation (1) to perform mixing control. It

[0040]   Y = k · Ym + (1-k) · Ys (1) here, k: motion coefficient Ym: output value of the subtraction circuit 13, Ys: output value of Y extraction filter 9, Is.

That is, when the image is a still image, the output of the Y extraction filter 9 is controlled, and when the image is a moving image, the output of the subtraction circuit 13 is controlled to be increased.

Example 2. FIG. 2 is a diagram showing the operation of the signal separation circuit according to the second embodiment of the present invention. In the figure, the difference from FIG. 1 is that the C signal extraction filter and H
The point is that two types of H signal extraction filters are provided, a vertical edge detection circuit is further provided, and a suitable filter is selected from the two types of filters according to the edge detection result.

In FIG. 2, (b1) and (b2) are operations for extracting the C signal. 2 (b1) is shown in FIG.
It is the same as FIG. 4B, and its frequency characteristic is shown in FIG.
It is represented by (c). The frequency characteristic of FIG. 2 (b2) is shown in FIG.
4 (a) to 4 (c), the pass characteristics in the vertical direction are wider than those in FIGS. 4 (a) to 4 (c).

2 (c1) and 2 (c2) show the operation for extracting the HH signal. 2 (c1) is shown in FIG.
It is the same as (c), and its frequency characteristic is shown in FIG.
It is represented by (c). The frequency characteristic of FIG. 2 (c2) is shown in FIG.
5A to 5C, the pass characteristics in the vertical direction are narrower than those of FIGS. 5A to 5C.

Generally, the correlation between the Y signal and the C signal is strong, and
If the signal contains vertical edge components, the C signal is also often a vertical edge. Therefore, when an edge component is detected in the Y signal, the pass band of the C signal is widened in the vertical direction and the pass band of the HH signal is narrowed in the vertical direction, so that the vertical frequency high-frequency component of the C signal leaks into the HH signal. Prevent.

FIG. 9 is a block diagram showing the configuration of the signal separation circuit of the second embodiment. In the figure, the first C extraction filter 10 is a filter that performs the operation of FIG.
The extraction filter 18 performs the operation of FIG. 2 (b2), the first HH extraction filter 11 performs the operation of FIG. 2 (c1), and the second HH extraction filter 19 of FIG.
It is a filter that performs the operation of (c2).

The two C signals obtained by the C extraction filters 10 and 18 are input to the mixing circuit 21 and the output 106 of the vertical edge detection circuit 20 is used to obtain the following equation (2).
Then, the mixture is controlled.

[0048]   C = h · Cb + (1-h) · Cn (2) here, h: vertical edge coefficient Cb: output value of C extraction filter 18, Cn: output value of C extraction filter 10, Is.

That is, when the Y signal is not a vertical edge component, the output of the first C extraction filter 10 has a narrow pass band in the vertical frequency direction, and when it is a vertical edge component, the pass band in the vertical frequency direction is Wide second C extraction filter 1
It is controlled to increase the ratio of the eight outputs.

Similarly, the two HH signals obtained by the HH extraction filters 11 and 19 are input to the mixing circuit 22, and the output 106 of the vertical edge detection circuit 20 performs the calculation by the following equation (3). In addition, the mixing is controlled.

[0051]   HH = h · Hn + (1-h) · Hb (3) here, Hn: output value of HH extraction filter 19, Hb: output value of HH extraction filter 11, Is.

That is, when Y is not a vertical edge component, the output of the first HH extraction filter 11 has a wide pass band in the vertical frequency direction, and when Y is a vertical edge component, the pass band in the vertical frequency direction is narrow. It is controlled to increase the ratio of the output of the second HH extraction filter 19.

FIG. 10 is a block diagram showing the configuration of the vertical edge detection circuit in the signal separation circuit of the second embodiment. In the figure, the vertical edge detection circuit includes 26 in FIG.
The outputs of the 1-line delay circuit 3 and the 1-line delay circuits 4 and 5 are input, and these signals are signals of three continuous scanning lines. The coefficient circuits 23 to 25 and the adder circuit 26 perform an operation between lines to obtain a vertical frequency high frequency component. Furthermore, by the low pass filter (LPF) 27,
After passing only the horizontal frequency low-frequency component, it is converted into an absolute value by the absolute value circuit 28, and the vertical edge component 1 of the Y signal
I get 06.

In the present embodiment, signal separation is performed by two types of C extraction filters and HH extraction filters, but a vertical edge detection circuit is used by using two or more types of C extraction filters and HH extraction filters. It is also possible to adopt a configuration in which finer switching of the filters is performed by the output of.

Example 3. FIG. 3 is a diagram showing the operation of the signal separation circuit according to the third embodiment of the present invention. In the figure, the difference from FIG. 1 is that the input composite color television signal 10
When the HH signal is not multiplexed with 1, the HH signal is not reproduced and the YC separation characteristic is switched according to the motion. 3, (b1) to (b3) are filters for extracting the C signal, and (b1) is a filter shown in FIG.
It is a filter equivalent to (b) and FIG. 2 (b1). (B
2) is a filter for extracting a C signal particularly suitable for a still image, and (b3) is a filter for extracting a C signal particularly suitable for a moving image.

Whether or not the HH signal is multiplexed with the input signal is determined by the information on the identification control signal transmitted using the scanning line at the uppermost end of the screen of each field of the composite color television signal. .

FIG. 11 is a block diagram showing the configuration of the signal separation circuit of the third embodiment. In the figure, the C signal extraction filter 10 performs the operation of FIG. 3 (b1), the frame comb filter 29 performs the operation of FIG. 3 (b2), and the intra-field filter 30 performs the operation of FIG. 3 (b3). It is a filter to do. By the output of the motion detection circuit 12,
If it is a completely still image, the frame comb filter 29, if it is a completely moving image, the in-field filter 30, and otherwise, the mixing circuit 32 so that the C signal is extracted by the C signal extraction filter 10. Is mixed and controlled.

The identification control signal is the identification control signal decoding circuit 3
5, the result is input to the switch circuit 34, and when the HH signal is not multiplexed, the signal extracted by the HH signal extraction filter 11 is turned off, and HH signal is extracted.
Do not output the signal.

Further, the output of the identification control signal decoding circuit 35 is input to the selection circuit 33, and when the HH signal is not multiplexed, the output of the mixing circuit 32 is selected, and when the HH signal is multiplexed. 8, the selection circuit 33 is controlled so that the output of the C signal extraction filter 10 is output as the C signal.

Similarly, the output of the identification control signal decoding circuit 35 controls the selection circuit 31. When the HH signal is not multiplexed, the input decoded color television signal 101 outputs C.
When the output of the subtraction circuit 13 for subtracting the signal is selected and the HH signal is multiplexed, the mixing circuit 14 is used as in FIG.
So that the output of the selection circuit 31 is output as the Y signal.
To control.

Example 4. FIG. 12 is a block diagram showing the configuration of the signal separation circuit according to the fourth embodiment of the present invention. In the figure, the difference from FIG. 8 is that when the input composite color television signal 101 is precombed, the signal obtained by the HH signal extraction filter 11 is
It is a point to be reproduced regardless of the motion detection result.

On the transmission side, when precombing is performed, Y, C, and HH are band-limited and multiplexed so as to fit in each signal band of the frequency distribution chart shown in FIG. 13B. Therefore, signals other than the HH signal do not leak into the HH signal multiplex area of FIG.
Even if the output of the HH extraction filter is always reproduced as an HH signal, interference due to crosstalk does not occur. Since the identification control signal also includes information for determining whether or not precombing is performed on the transmission side, this identification control signal switches whether to control the output of the HH signal extraction filter. be able to.

In FIG. 12, the identification control signal decoding circuit 3
Reference numeral 5 decodes the identification control signal, inputs it to the selection circuit 36, selects the output of the HH extraction filter 11 when precombing is performed, and selects it when precombing is not performed. Similar to FIG. 8, the selection circuit 36 is controlled so that the output of the multiplication circuit 16 is output as the HH signal.

[0064]

According to the signal separating apparatus of the first aspect of the present invention, the HH signal and the C signal are extracted by the band pass filter which matches the signal characteristics of the HH signal and the C signal. , HH signals are reproduced as C signals, or C signals are reproduced as HH signals, and as a result, crosstalk can be reduced.

[0065] Further, in the bandpass filter matching the signal characteristics of the C signal, since the extracted C signal prevents the HH signal leaked to the C signal band is reproduced as C signal, resulting Crosstalk can be reduced.

According to the signal separating apparatus of the second aspect of the present invention, in addition to the above effects , the HH signal is extracted by the band pass filter that matches the signal characteristics of the HH signal.
It is possible to prevent the C signal leaking into the HH signal band from being reproduced as an HH signal, and as a result, it is possible to reduce crosstalk.

Further, the signal is extracted by switching the vertical pass band of the C extraction filter and the HH extraction filter depending on whether or not the Y signal contains a vertical edge component.
Depending on the design, it is possible to reduce crosstalk in which the vertical frequency high-frequency component of the C signal leaks into the HH signal.

[0068]

According to the signal separating apparatus of the third aspect of the present invention, the output of the HH signal extraction filter is switched depending on whether or not the precombing process is performed. Even if there is an error in the motion detection, it does not depend on the error.

[Brief description of drawings]

FIG. 1 is a diagram showing an operation of a signal separation circuit according to a first embodiment of the present invention.

FIG. 2 is a diagram showing an operation of a signal separation circuit according to a second embodiment of the present invention.

FIG. 3 is a diagram showing an operation of a signal separation circuit according to a third embodiment of the present invention.

FIG. 4 is a diagram showing the characteristics of the color signal extraction filters of Examples 1 to 4.

FIG. 5 is a diagram showing characteristics of the high-definition signal extraction filters of Examples 1 to 4.

FIG. 6 is a diagram showing characteristics of a color signal extraction filter according to the second embodiment.

FIG. 7 is a diagram showing characteristics of a high definition signal extraction filter according to the second embodiment.

FIG. 8 is a block diagram illustrating a configuration of a signal separation circuit according to the first exemplary embodiment.

FIG. 9 is a block diagram illustrating a configuration of a signal separation circuit according to a second exemplary embodiment.

FIG. 10 is a block diagram showing a configuration of a vertical edge detection circuit in the signal separation circuit according to the second embodiment.

FIG. 11 is a block diagram showing a configuration of a signal separation circuit according to a third embodiment.

FIG. 12 is a block diagram showing a configuration of a signal separation circuit according to a fourth embodiment.

FIG. 13 is a three-dimensional frequency spectrum distribution map of a high-definition television signal in which HH signals are multiplexed,
(A) is a view seen from an oblique direction, (b) is a view seen from the positive direction of the μ axis, and (c) is a projection view onto the μ axis.

FIG. 14: Y signal and C in three-dimensional frequency space
(A) is a view of the spectrum distribution of the signal and the HH signal seen from an oblique direction, (b) is a view of the μ-axis seen from the positive direction,
(C) is a projection view on the μ axis.

FIG. 15 is a diagram showing an operation of a conventional signal separation circuit.

FIG. 16 is a diagram showing characteristics of a conventional luminance signal extraction filter.

FIG. 17 is a diagram showing characteristics of a conventional color signal extraction filter.

FIG. 18 is a diagram showing characteristics of a conventional high definition signal extraction filter.

FIG. 19 is a block diagram showing a configuration of a conventional signal separation circuit.

FIG. 20 is a Y extraction circuit 3 in a conventional signal separation circuit.
7 is a block diagram showing the configuration of No. 7.

FIG. 21 is a C extraction circuit 3 in a conventional signal separation circuit.
8 is a block diagram showing a configuration of No. 8.

FIG. 22 is a block diagram showing a configuration of an HH signal extraction circuit 39 in a conventional signal separation circuit.

[Explanation of symbols]

1,8 262 line delay circuit, 2,4,5,7 1 line delay circuit, 3,6261 line delay circuit, 9,40
-42 Y signal extraction filter 10, 18, 44-46
C signal extraction filter, 11, 19, 48 HH signal extraction filter, 12 motion detection circuit, 13 subtraction circuit, 1
4, 21, 22, 32, 43, 47 mixing circuit, 15 addition circuit, 16 multiplication circuit, 17 conversion circuit, 20 vertical edge detection circuit, 23, 24, 25 coefficient circuit, 27
LPF, 28 absolute value circuit, 29 frame comb filter, 30 field band pass filter, 34 switch circuit, 31, 33, 36 selection circuit, 35 identification control signal decoding circuit, 37 Y signal extraction circuit, 38 C signal extraction circuit , 39 HH signal extraction circuit, 101 input composite color television signal, 102 output luminance signal, 103
Output color signal, 104 output high definition signal, 105 motion signal, 106 vertical edge signal.

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Yoichi Asamoto, Nagaokakyo Baba Institute, 1st location, Mitsubishi Electric Co., Ltd. Kyoto Works (72) Inventor, Masaki Yamakawa, Nagaokakyo City, Baba Institute, Mitsubishi Electric Corporation, Kyoto Plant (56) References JP-A-6-38236 (JP, A) JP-A-63-46090 (JP, A) JP-A 1-243687 (JP, A) (58) Fields investigated (Int. Cl. ⁷⁾ , DB name) H04N 9/78 H04N 7/015

Claims (3)

(57) [Claims] 1. A horizontal high-definition signal (hereinafter referred to as HH signal).
Composite color television signal (high definition
Television signal), luminance signal and color signal, and HH
In a signal separation device that separates signals, this is an identification control signal that identifies information related to the input signal.
Are transmitted by being multiplexed with the composite color television signal.
Identification control signal decoding means for decoding a signal which is delayed by 262 lines of the input composite color television signal
Delays the output signal of the first 262 line delay circuit and the first 262 line delay circuit for one line
And a first 1-line delay circuit for delaying the output signal of the first 1-line delay circuit by 261 lines
Delays the output signal of the first 261 line delay circuit and the first 261 line delay circuit for one line
And a second 1-line delay circuit for delaying the output signal of the second 1-line delay circuit by 1 line.
The third 1-line delay circuit and the third 1-line delay circuit output signal are delayed by 261 lines.
The second 261 line delay circuit for delaying and the output signal of the second 261 line delay circuit delayed by one line
4th 1-line delay circuit for delaying the output signal of the 4th 1-line delay circuit by 262 lines
Second 262 line delay circuit, input composite color television signal and line delay
Multiply a given coefficient for each of the output signals of the circuit
Color signal extraction means for extracting a color signal by adding, input composite color television signal and line delay
Multiply a given coefficient for each of the output signals of the circuit
HH signal extraction means for extracting the HH signal by adding
, And multiple composite color televisions with time differences of up to 4 fields
Luminance signal extraction that performs calculation between vision signal frames
Colors from filters or composite color television signals
The luminance signal is subtracted by the subtraction circuit that subtracts the signal and the HH signal.
Luminance signal extraction means to obtain, by detecting the amount of motion of the composite color television signal,
Controlling the output of the luminance signal extraction means and the HH signal extraction means
And a motion detecting means for performing the addition in the color signal extracting means.
The specified coefficient is applied to the input composite color television signal.
-0.083, the output of the first 262 line delay circuit
About 0.125, the first 1-line delay circuit output
About -0.125, the first 261 line delay circuit output
-0.083 for output, output of second 1-line delay circuit
0.165 for power, output of third 1-line delay circuit
-0.083 for the second 261 line delay circuit
-0.125 for output, fourth 1-line delay circuit
0.125 for output, second 262 line delay times
The road output is set to -0.083, which is used when the HH signal extraction means performs addition.
Apply the above coefficient to the input composite color television signal.
About -0.1, the output of the first 262 line delay circuit
About -0.1, about the output of the first 1-line delay circuit
-0.15 for the first 261 line delay circuit output
-0.05, for the second 1-line delay circuit output
Is 0.2, and the third 1-line delay circuit output is −
0.05, for the second 261 line delay circuit output
0.15, for the output of the fourth 1-line delay circuit,
0.1, for the output of the second 262 line delay circuit-
A signal separation device having a value of 0.1. 2. A horizontal high-definition signal (hereinafter referred to as HH signal)
Composite color television signal (high definition
Television signal), luminance signal and color signal, and HH
In a signal separation device that separates signals, this is an identification control signal that identifies information related to the input signal.
Are transmitted by being multiplexed with the composite color television signal.
Identification control signal decoding means for decoding a signal which is delayed by 262 lines of the input composite color television signal
Delays the output signal of the first 262 line delay circuit and the first 262 line delay circuit for one line
And a first 1-line delay circuit for delaying the output signal of the first 1-line delay circuit by 261 lines
Delays the output signal of the first 261 line delay circuit and the first 261 line delay circuit for one line
And a second 1-line delay circuit for delaying the output signal of the second 1-line delay circuit by 1 line.
The third 1-line delay circuit and the third 1-line delay circuit output signal are delayed by 261 lines.
The second 261 line delay circuit for delaying and the output signal of the second 261 line delay circuit delayed by one line
4th 1-line delay circuit for delaying the output signal of the 4th 1-line delay circuit by 262 lines
Second 262 line delay circuit, input composite color television signal and line delay
Multiply a given coefficient for each of the output signals of the circuit
First color signal extraction means for extracting color signals by adding
And the above input composite color television signal and line delay
Multiply a given coefficient for each of the output signals of the circuit
Second color signal extraction means for extracting color signals by adding
And the above input composite color television signal and line delay
Multiply a given coefficient for each of the output signals of the circuit
First HH signal extraction for extracting HH signal by adding
Means and input composite color television signal and line delay
Multiply a given coefficient for each of the output signals of the circuit
Second HH signal extraction for extracting HH signal by adding
Means and a plurality of composite color televisions with a time difference of up to 4 fields
Luminance signal extraction that performs calculation between vision signal frames
Colors from filters or composite color television signals
The luminance signal is subtracted by the subtraction circuit that subtracts the signal and the HH signal.
Luminance signal extraction means to obtain, by detecting the amount of motion of the composite color television signal,
Controlling the output of the luminance signal extraction means and the HH signal extraction means
Motion detection means and vertical edge detection means for detecting vertical high frequency components of the image.
And adding in the first color signal extraction means
The above-mentioned predetermined coefficient used for
Signal is -0.083, the first 262 line
The delay circuit output is 0.125, the first 1 line delay
-0.125 for the extended circuit output, the first 261 lines
The output of the delay circuit is -0.083, the second 1-line
The output of the delay circuit is 0.165, the third line
The delay circuit output is -0.083 and the second 261 line
The output of the in-delay circuit is -0.125, and the fourth
0.125 for the output of the in-delay circuit, 262 for the second
The line delay circuit output is set to -0.083, and is used when adding in the second color signal extraction means.
Input the above-mentioned predetermined coefficient to the input composite color television
-0.1 for signal No., output from the first 262 line delay circuit
0.15 for power, 1st line delay circuit output
About -0.1, the output of the first 261 line delay circuit
About -0.05, the output of the second 1-line delay circuit
0.2 for the output of the third 1-line delay circuit
-0.05, about the output of the second 261 line delay circuit
Is -0.1, and for the output of the fourth 1-line delay circuit,
0.15, for the second 262 line delay circuit output
-0.1, and when adding in the first HH signal extraction means
The above-mentioned predetermined coefficient to be used is input to the composite color television.
-0.1 for signal, first 262 line delay circuit
Output is -0.1, first 1-line delay circuit output
Is -0.15, the first 261 line delay circuit output
-0.05 for power, second 1-line delay circuit output
About 0.2, about the output of the third 1-line delay circuit
-0.05, One to a second 261-line delay circuit output Te
0.15, about the output of the fourth 1-line delay circuit
Is -0.1, for the output of the second 262 line delay circuit
Is set to −0.1, and when the second HH signal extracting means performs addition,
The above-mentioned predetermined coefficient to be used is input to the composite color television.
-0.083 for signal, first 262 line delay
-0.125 for circuit output, first 1 line delay
The circuit output is 0.125, and the first 261 lines are delayed.
-0.083 for the output of the extended circuit, delayed for the second one line
0.165 for delay circuit output, third 1-line delay
-0.083 for circuit output, second 261 line
The output of the delay circuit is 0.125, and the delay of the fourth one line is
-0.125 for the extended circuit output, the second 262 lines
The output of the delay circuit is set to -0.083, and the vertical high frequency component is detected by the vertical edge detecting means.
When the color signal is generated, the second color signal extracting means is used as the color signal.
The output signal of HH signal is used as the second HH signal extraction
Select the output signal of the stage and place it in the vertical edge detection means.
If it is determined that there is no vertical high frequency component,
Then, the output signal of the first color signal extraction means is changed to the HH signal.
The output signal of the first HH signal extraction means is selected as
A signal separation device characterized in that. 3. When the identification control signal decoding means determines that the input signal has been precombed,
2. The signal separating apparatus according to claim 1, wherein the output of the HH signal extraction filter is not controlled according to the output result of the motion detecting means.