JPH04360492A - Television system converter - Google Patents

Abstract

PURPOSE:To record the output signal of the converter with a present VTR, etc., even when a MUSE signal is converted to an interlace signal for which the number of the scanning lines is 525 and reproduced by an IDTV or EDTV receiver. CONSTITUTION:R, G and B signals converted from a MUSE signal to the non- interlace or interlace signal for which the number of the scanning lines is 525 are converted to the interlace signal for which the number of the scanning lines is 5252, in a time base converting circuit 11, and the interlace signal is converted to an analog signal by a D/A converter 12 and outputted from an output terminal. For this reason, regardless of the fact whether the conventional output of the converting system is the non-interlace signal or the interlace signal, the interlace signal is independently outputted.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television system converter for converting a MUSE signal into a non-interlaced signal having 525 scanning lines.

0002

2. Description of the Related Art The MUSE system developed by NHK as a high-definition broadcasting system is not compatible with the NTSC system, which is the current television system, and therefore cannot be played back on current television receivers. Therefore, in order to play the MUSE signal on a current television receiver, the MUSE signal must be converted to NTS.
It is necessary to convert it to a C signal.

[0003] Current NUSC type receivers can generally be classified into two types. One is a conventional TV receiver that reproduces images using interlaced scanning with 525 scanning lines, and the other is an IDTV (Improved Definition TV) that reproduces images using non-interlaced scanning with 525 scanning lines.
ion TV) or EDTV (Extended
It is a television receiver called Definition TV.

[0004] When converting a MUSE signal to an NTSC signal, it is necessary to convert both the aspect ratio and the number of scanning lines. The MUSE signal has an aspect ratio of 16:9 and 1125 scanning lines, whereas the NTSC signal has an aspect ratio of 4:3 and 535 scanning lines.

[0005] Aspect ratio conversion is carried out in two ways: a method in which the entire screen of the MUSE signal is displayed on the screen of an NTSC receiver (hereinafter referred to as "full screen display"), and a method in which the center portion of the MUSE signal is enlarged and displayed (hereinafter referred to as "full screen display"). , called "zoom display")
A television system converter has been developed which converts a MUSE signal into an interlaced signal with 525 scanning lines or a non-interlaced signal with 525 scanning lines, and which has two conversion modes.

FIG. 3 is a block diagram illustrating a prior art television format converter by the applicant. In the figure, 1 is the first input terminal for inputting the MUSE signal, 2
is an A/D converter that converts the input MUSE signal into a digital signal; 3 is a luminance signal processing circuit that receives the output of the A/D converter 2; and 4 is the input of the output of the A/D converter 2. 5 is a frequency conversion circuit which inputs the outputs of the luminance signal processing circuit 3 and the chrominance signal processing circuit 4 and converts them into a non-interlaced signal or an interlaced signal with 525 scanning lines; An inverse matrix circuit that receives the output of the frequency conversion circuit 5 as an input; 7 is a D/A converter that converts the output of the inverse matrix circuit 6 into an analog signal; 8;
a, 8b, and 8c are output terminals of the D/A converter 7; 9 is a second input terminal to which a selection signal for full-screen display and zoom display is input; and 10 is a selection signal for non-interlace signal and interlace signal. This is the third input terminal for input.

FIG. 5 is a block circuit diagram showing the configuration of the luminance signal processing circuit 3. As shown in FIG. In the figure, 31 is an input terminal for inputting the output of the A/D converter 2, 32 is a field interpolation circuit that performs interpolation processing on the input signal, and 33 is an input terminal for receiving the output of the field interpolation circuit 32. , a scanning line number conversion circuit that doubles the number of scanning lines, and 34 is an output terminal.

FIG. 6 is a block circuit diagram showing the configuration of the color signal processing circuit 4. As shown in FIG. In the figure, 41 is an input terminal to which the output of the A/D converter 2 is input, 42 is an intra-field interpolation circuit that performs interpolation processing on the input signal, and 43 is an input terminal for the output of the intra-field interpolation circuit 42. and a color difference signal separation circuit for separating into two color difference signals (R-Y, B-Y), 44
b and 44c are first and second scanning line number conversion circuits that each input the output of the color difference signal separation circuit 43 and convert the number of scanning lines by four; 45b is an output terminal of the scanning line number conversion circuit 44b; 45c is an output terminal of the scanning line number conversion circuit 44c.

Next, the operation will be explained. Figure 4 shows
This is a diagram for explaining the conversion concept of this embodiment, and the MUSE signal is an interlaced signal with an aspect ratio of 16:9 and a number of scanning lines of 1125, of which the number of effective scanning lines is 1032.

FIG. 4(a) shows the conversion concept in the case of full-screen display. Considering the number of effective scanning lines and effective scanning period of the MUSE signal and the NTSC signal, 1032 lines of interlaced video information can be converted into 344 interlaced or non-interlaced video information.

FIG. 4(b) shows a conversion concept in the case of zoom display, in which interlaced video information with 960 scanning lines of the MUSE signal is converted into 480 scanning lines with left and right video information deleted. Convert to interlaced or non-interlaced video information.

In FIG. 3, the MUSE signal input from the first input terminal 1 has a sampling frequency of 16.2 MHZ.
Then, it is sampled by the A/D converter 2. Sampled M
The USE signal is sent to the luminance signal processing circuit 3 and the color signal processing circuit 4.
is applied to

The operation of the luminance signal processing circuit 3 will be explained below with reference to FIG.
Explain using. MUSE input to input terminal 31
Since the luminance signal of the signal is subsampled,
An intra-field interpolation circuit 32 performs intra-field interpolation processing. The signal output from the field interpolation circuit 32 is input to the scanning line number conversion circuit 33.

The interlaced luminance signal of 1032 effective scanning lines inputted to the scanning line number conversion circuit 33 is shown in FIG.
The signal arrangement is as shown in a), and in the figure, Y(i) indicates information on the i-line scanning line. The scanning line number conversion circuit 33 uses, for example, a vertical digital filter to double the number of scanning lines as shown in FIG. is output from the output terminal 34.

Next, the operation of the color signal processing circuit 4 will be explained using FIG. 6. Since the color signal of the MUSE signal input to the input terminal 41 has been subsampled, it is subjected to intra-field interpolation processing by the intra-field interpolation circuit 42. The signal output from the field interpolation circuit 42 is input to the color difference signal separation circuit 43.

The interlaced line sequential color difference signal having 1032 effective scanning lines inputted to the color difference signal separation circuit 43 is as follows.
The signal arrangement is as shown in FIG. 8(a), and the color difference signal separation circuit 43 separates the RY signal and the BY signal as shown in FIG. 8(b) and FIG. 8(c). Ru. The R-Y signal separated in this way is sent to the first scanning line number conversion circuit 44.
b, and the B-Y signal is input to the second scanning line number conversion circuit 4.
4c.

The RY signal input to the first scanning line conversion circuit 44b has a signal arrangement as shown in FIG. Using a vertical digital filter, the number of scanning lines is quadrupled as shown in FIG. 9(b), resulting in an effective number of scanning lines of 1032.
The non-interlaced RY signal of the book is outputted from the output terminal 45b.

The B-Y signal input to the second scanning line conversion circuit 44c has a signal arrangement as shown in FIG. 9(c), and like the R-Y signal, the second scanning line number is Conversion circuit 44
In c, for example, using a vertical digital filter, the number of scanning lines is converted to 4 times as shown in FIG. 9(c),
A non-interlaced BY signal with an effective scanning line count of 1032 is output from the output terminal 45c.

The non-interlaced luminance signal, R-Y signal, and B-Y signal with an effective scanning line count of 1032 obtained as described above are input to the frequency conversion circuit 5 as shown in FIG. is input. The non-interlaced signal with 1032 effective scanning lines input to the frequency conversion circuit 5 is shown in FIG.
The signal arrangement is as shown in a). In the frequency conversion circuit 5, the second input terminal 9 and the third input terminal 10
10(a) to (e) according to the selection signal input from
) The scanning lines are thinned out as shown in ( ).

The type of scanning line thinning method is determined by the combination of selection signals input from the second input terminal 9 and the third input terminal 10, such as full-screen non-interlaced signal, full-screen interlaced signal, It is divided into a zoom display non-interlace signal and a zoom display interlace signal.

In order to obtain a full-screen display non-interlaced signal, as shown in FIG.
One line is used for each book to obtain a non-interlaced signal with 322 effective scanning lines. In addition, when obtaining a full-screen display interlace signal, as shown in FIG. 322 interlaced signals are obtained.

When obtaining a zoom display non-interlace signal, as shown in FIG. 10(d), the scanning lines are thinned out and the scanning lines existing at the same vertical position are divided into two for each field.
By using one line from each book and extracting only 480 lines, a non-interlaced signal with 480 effective scanning lines is obtained. In addition, when obtaining a zoom display interlaced signal, as shown in FIG. 10(e), the scanning lines are thinned out and one scanning line is used for each field instead of four, resulting in an effective number of 480 scanning lines. Get a real interlaced signal.

In the frequency conversion circuit 5, the above-mentioned scanning line thinning is performed by a memory whose input and output operate asynchronously. The reading frequency of this memory is a frequency that maintains circularity when converted to an NTSC signal, and is uniquely determined. In addition, this frequency conversion circuit 5 simultaneously realizes time axis expansion of the R-Y signal and the B-Y signal, and furthermore, this circuit adds blanking signals to the top and bottom of the video, and the number of scanning lines is 525. A non-interlaced or interlaced luminance signal, RY signal and BY signal are output to the inverse matrix circuit 6.

The inverse matrix circuit 6 converts the input luminance signal, RY signal, and BY signal into R, G, and B signals and outputs them. The R, G, and B signals output from the inverse matrix circuit 6 are input to a D/A converter 7, where they are converted into analog signals and output from output terminals 8a, 8b, and 8c.

[0025]

[Problems to be Solved by the Invention] Since the conventional television system converter is configured as described above, the MUS
When converting the E signal into a non-interlaced signal with 525 scanning lines and playing it back on an IDTV or EDTV receiver, the interlaced signal with 525 scanning lines is not output, so it cannot be recorded on current VTRs, etc. There was a problem in that the output signal of this converter could not be recorded by a playback device.

Furthermore, when recording on a current VTR, etc., a non-interlaced signal with 525 scanning lines is not output, so it is difficult to reproduce the output signal of this converter on an IDTV or EDTV receiver. , IDTV or EDTV
It is necessary to perform scanning line interpolation to convert into a non-interlaced signal within the receiver, and there is also the problem that image quality deterioration occurs due to scanning line interpolation in the case of moving images.

The present invention was made to solve the above-mentioned problems, and the MUSE signal is divided into 525 scanning lines.
Convert to real non-interlaced signal, IDTV or E
Even when playing back on a DTV receiver, current VTR
The purpose of this invention is to obtain a television system converter that can record the output signal of this converter.

[0028]

[Means for Solving the Problems] A television system converter according to the present invention includes means for converting a signal converted from a MUSE signal into a non-interlaced signal having 525 scanning lines into an interlaced signal, This interlaced video signal is output independently of the video signal.

[0029]

[Operation] The television system converter of the present invention is configured to be able to simultaneously output a conventional video signal output and an interlaced video signal, so that the video signal output of the conventional conversion system is a non-interlaced signal. Since the interlaced signal is output independently regardless of whether it is an interlaced signal or not, the output signal of this converter can be recorded on a current VTR etc. even when played back on an IDTV or EDTV receiver. Can be done.

[0030]

【Example】

Example 1. Hereinafter, one embodiment of the present invention will be described with reference to the drawings. In FIG. 1, 1 to 10 indicate the same components as the conventional example shown in FIG. 3, and 11 is an inverse matrix circuit 6.
A time axis conversion circuit that converts the time axis by inputting the output of
12 is a second D/A converter that converts the output of the time axis conversion circuit 11 into an analog signal; 13a, 13b, and 13c are D/A converters;
/A converter 12 output terminal.

Next, the operation will be explained. In Figure 1, the same parts as in Figure 3 operate in the same way, so
Detailed explanation will be omitted.

[0032] R, G,
The B signal is converted into an interlaced signal by a time axis conversion circuit 11. The operation of the time axis conversion circuit 11 will be described below using FIG. 2.

[0033] When the selection signal input from the third input terminal 10 selects a non-interlaced signal,
The signal input to the time axis conversion circuit 11 is a non-interlaced signal with 525 scanning lines as shown in FIG. 2(a). In this case, as shown in FIG. 2B, the number of scanning lines is thinned out at a ratio of 2 to 1, and the signal is converted into an interlaced signal with 525 scanning lines.

When the selection signal input from the third input terminal 10 selects an interlaced signal, the signal input to the time axis conversion circuit 11 is as shown in FIG. 2(c). This is an interlaced signal with 525 scanning lines. In this case, the scanning lines are not thinned out from the input signal shown in FIG. 2(c), and an interlaced signal having 525 scanning lines as shown in FIG. 2(d) is output.

The interlaced R, G, B signals of 525 scanning lines output from the time axis conversion circuit 11 are
The signal is input to the D/A converter 12 of. The R, G, and B signals input to the second D/A converter 12 are converted into interlaced signals with 525 scanning lines of analog signals, and outputted from the second output terminals 13a, 13b, and 13c. Ru.

[0036]

[Effects of the Invention] As described above, according to the present invention, MUS
A circuit is installed to convert the signal converted from the E signal into a non-interlace signal with 525 scanning lines into an interlace signal, and outputs an interlace video output that is independent of the video output of the conventional conversion system. With this configuration, an interlace signal can be output regardless of whether the video output of a conventional conversion system is a non-interlace signal or an interlace signal, so even when playing back on an IDTV or EDTV receiver, The effect of being able to record the output video signal of this converter on a current VTR etc. can be obtained.

[Brief explanation of drawings]

FIG. 1 is a block circuit diagram showing a television format converter according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining the operation of this embodiment.

FIG. 3 is a block circuit diagram showing a conventional television format converter.

FIG. 4 is a diagram showing a conversion concept of a scanning line conversion method.

FIG. 5 is a block circuit diagram of a luminance signal processing circuit.

FIG. 6 is a block circuit diagram of a color signal processing circuit.

FIG. 7 is a diagram for explaining the operation of the luminance signal processing circuit.

FIG. 8 is a diagram for explaining the operation of the color signal processing circuit.

FIG. 9 is a diagram for explaining the operation of the color signal processing circuit.

FIG. 10 is a diagram for explaining the operation of the conventional example shown in FIG. 3;

[Explanation of symbols]

2 A/D converter 3 Luminance signal processing circuit 4 Color signal processing circuit 5 Frequency conversion circuit 6 Inverse matrix circuit 7 D/A converter 11 Time axis conversion circuit 12 D/A converter

Claims (1)

[Claims] 1. Means for converting an interlaced signal of 1032 effective scanning lines of a MUSE signal into a non-interlaced luminance signal and first and second color difference signals having 1032 scanning lines; The 1032 non-interlaced luminance signals and the first and second color difference signals are converted to the number of scanning lines corresponding to full screen display and zoom screen display, and blanking signals are added to the top and bottom of the screen. means for converting the non-interlaced signal or interlaced signal having 525 scanning lines into a non-interlaced signal or interlaced signal having 525 scanning lines;
, G, B signals, converts the non-interlaced signal or interlaced signal having 525 scanning lines into
A television format converter characterized by comprising a time base conversion circuit that converts the signal into a book interlaced signal and outputs the signal.