JPH07336655A - Edtv-2 signal transmitting method and edtv-2 receiver therefor - Google Patents

Abstract

PURPOSE:To avoid degradation of a modulation HH signal by extracting a luminance transmission signal and a color transmission signal and adding an EDTV-2 discrimination signal in which the discrimiantion command of a letter box signal is fixed. CONSTITUTION:From an S video output terminal 102, the luminance signal and the color signal processed by a three-dimensional Y/C separation circuit 4 and an HH reproduction circuit 5 are outputted. An EDTV-2 discrimination signal in which the only discrimination command of a letter box becomes 1 is added to the luminance signal in a discrimination signal addition circuit 111. Because the discrimination command of the letter box is not modulated, the command becomes possible to be recorded as the luminance signal of a VCR 104 with S video terminal. When this video signal is viewed by an EDTV-2 receiver 101, all the signal changeover switches 107 to 109 are connected with an S video input terminal 103. A discrimination signal detection circuit 3 detects the discrimination command multiplexed not on the S video input terminal 103 but on the luminance signal and controls the command so that a vertical deflection amplitude may be 4/3 times.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention records an EDTV2 broadcast received by a television receiver on a home VCR,
Further, the present invention relates to a method of transmitting an EDTV2 signal through a wired connection between an EDTV2 receiver and a home recording device, such as when a VCR of a recorded program is reproduced and viewed on a television receiver, and the EDTV2 receiver. It is a thing.

[0002]

2. Description of the Related Art The EDTV2 broadcasting system is currently being developed in Japan. The purpose is to transmit wide video with an aspect ratio of 16: 9 while maintaining compatibility with the current NTSC broadcasting system.

First, referring to FIGS. 8 and 9, the EDT
The outline of the V2 broadcasting system will be described. Figure 8 shows EDT
It is a schematic diagram for explaining a method of multiplexing video signals of the V2 broadcast system. In FIG. 8, the numbers 1 to 525 on the vertical axis at the left end are the numbers of scanning lines within one frame period, and the numbers on the horizontal axis at the upper end are when one horizontal scanning period is sampled at a frequency four times the color subcarrier. 9 from 0 to 909
It is the number of 10 pixels.

The video signal of the EDTV2 broadcasting system is currently 4:
When images are received by three receivers, black bands are displayed at the top and bottom, and a 16: 9 image is displayed in the center in the so-called letterbox format. Referring to FIG. 8, in the first field, a video signal is transmitted by a total of 180 main image units from scanning line numbers 53 to 232. In the case of the current NTSC broadcasting, since the image was placed on a total of 240 scanning lines of scanning line numbers 23 to 262, this corresponds to exactly 3/4 scanning lines.
A signal based on black is transmitted to a total of 30 upper non-picture areas of scanning line numbers 23 to 52 and a total of 30 lower non-picture areas of scanning line numbers 233 to 262.

Video signals of the EDTV2 broadcasting system are transmitted at 16: 9.
When the image is received by the wide receiver of, if the main image portion is simply zoomed and displayed, the horizontal and vertical resolutions will be lower than in the current broadcast, so the reinforcement signal is multiplexed. First, a horizontal high frequency signal of 4.2 to 6 MHz (hereinafter, referred to as an HH signal) is modulated by a blow-out carrier and multiplexed on the main picture portion. Further, the vertical reinforcement signal of the luminance signal is modulated by the color subcarrier and multiplexed in the upper and lower non-image parts. The upper and lower non-image areas are horizontally divided into three (pixel numbers 7 to 258, 259 to 51).
Information corresponding to 180 main image areas (0 divisions, 511 to 762 divisions) can be multiplexed by a total of 60 scanning lines in the upper and lower non-image areas. The signals sent by the vertical reinforcement signal are a vertical time resolution reinforcement signal (hereinafter referred to as VT signal) and a vertical high frequency signal (hereinafter referred to as VH signal). The VT signal is a reinforcement signal when converting the 180 interlaced scanning signals of the main picture portion into 360 progressive scanning signals, and the VH signal is the progressive scanning converted 360 video signals of 480.
It is a reinforcement signal when zooming (3-4 scanning line number conversion) to a book.

Scanning line numbers 22 and 285 in FIG.
The identification signal of DTV2 is multiplexed. This will be described with reference to FIG. FIG. 9 shows a waveform diagram of the EDTV2 identification signal. In FIG. 9, as numbers are attached to the waveform diagram, 27 from B1 to B27 are included in one horizontal scanning period.
Bit information is multiplexed. Each bit has a width of 7 cycles (= about 2 μsec) of the color subcarrier. Figure 9
The table below the waveforms in Figure 1 summarizes the information contents of each bit and explains the major ones. 40 IRE for B3 and B4
, EDTV2 broadcast, and 0IRE, NTSC broadcast. In B6 to B23, color subcarriers are multiplexed with an amplitude of ± 20 IRE, and when the phase is 0, it is 1,
The time of π phase (in phase with color burst) is defined as 0. B8, B9, and B10 provide VT signal and VH, respectively.
It is possible to identify whether the signal and the HH signal are multiplexed.
In the EDTV2 identification signal, in addition to the identification information as described above, phase information of the blow-out carrier that modulates the HH signal is multiplexed in B25 to 27, and further, three division points of the 27-bit information (B1 to 9). , B10-18, B19-27)
Is information indicating the positions of the three division points of the VT signal / VH signal multiplexed in the upper and lower non-picture areas.

As a document describing the circuit configuration of the conventional EDTV2 receiver for receiving the EDTV2 signal as described above, (Nikkei Electronics 1994.1-31 n
o. 600 P. P. 142-149, “2 parts <transmission / reception circuit> high-resolution component is separated and transmitted”).

A conventional EDTV2 receiver will be described below with reference to FIG. FIG. 7 is a block diagram of a circuit of a conventional EDTV2 receiver. In FIG. 7, reference numeral 1 is a tuner circuit that receives and tunes a broadcast to detect a video and outputs a composite video signal. Reference numeral 2 is an A / D converter that converts the composite video signal output from the tuner circuit 1 into a digital signal. A
The identification signal detection circuit connected to the output terminal of the D / D converter 2 detects the EDTV2 identification signal multiplexed in the 22nd and 285th horizontal scanning periods of the horizontal scanning period of 525 lines / frame of the NTSC signal. It is a circuit to do. Reference numeral 4 denotes a three-dimensional Y / C separation circuit connected to the output terminal of the A / D converter 2, which separates and extracts a luminance signal and a chrominance signal by motion adaptive processing. Reference numeral 5 denotes an HH reproduction circuit, which further separates the color signal extracted by the three-dimensional Y / C separation circuit 4 into a modulated HH signal and a color signal, and the HH signal is detected by the identification signal detection circuit 3. It is reproduced by multiplying the extracted blow-out carrier and the modulated HH signal. 6 is a luminance signal of 4.2 M output from the three-dimensional Y / C separation circuit 4.
An HH synthesizer for adding a component below Hz and a component of the HH signal output from the HH reproducing circuit 5 in the 4.2 to 6 MHz band, and 7 demodulates the color signal extracted by the HH reproducing circuit 5 to 2
It is a color demodulation circuit that outputs one color difference signal by time division multiplexing.

Numeral 8 is a motion adaptive scanning line interpolation circuit which is used in a clear vision receiver or the like and which sequentially produces scanning signals from interlaced scanning signals. The luminance signal outputted from the HH synthesizer 6 and the color demodulation circuit 7 are outputted. And a luminance difference line signal of 9, a luminance interpolation line signal of 10, a color difference current line signal of 11, and a color difference interpolation line signal of 12 are output.

Reference numeral 13 is a VT reproducing circuit connected to the output terminal of the A / D converter 2, and demodulates the multiplexed VT signal and VH signal modulated by the color subcarrier on the scanning lines in the upper and lower non-image areas. Then, the VT signal is reproduced. Reference numeral 14 denotes a VT synthesizer that adds the high frequency component of the luminance interpolation line signal 10 output from the motion adaptive scanning line interpolation circuit 8 and the low frequency component of the VT signal output from the VT reproduction circuit 13. 1
A VH reproducing circuit 5 reproduces a VH signal from the signals separated and output by the VT reproducing circuit 13.

Reference numeral 16 is a scanning line number conversion circuit composed of a field memory and a vertical filter.
The number of scanning lines is multiplied by 4/3 and 480 scanning lines are combined to obtain 4 of 17 luminance current line signals, 18 luminance interpolation line signals, 19 color difference current line signals, and 20 color difference interpolation line signals. Outputs seed signal. 21 and 22 are VH synthesizers,
The VH signal output from the VH reproduction circuit 15 is added to each of the luminance current line signal 17 and the luminance interpolation line signal 18 output from the scanning line number conversion circuit 16.

Reference numeral 23 denotes a double speed conversion circuit composed of a line memory, which sequentially generates a scanning luminance signal from the luminance current line signal output from the VH synthesizer 21 and the luminance interpolation line signal output from the VH synthesizer 22. A scanning color difference signal is sequentially created from the color difference current line signal 19 and the color difference interpolation line signal 20 output from the scanning line number conversion circuit 16. Two
Reference numeral 4 denotes a D / A converter connected to the output of the double speed conversion circuit 23, which outputs a luminance signal for progressive scanning and two color difference signals.

Reference numeral 25 is an RG for synthesizing RGB signals from a signal output from the D / A converter 24 by matrix calculation.
The B processing circuit, 26 is a display for displaying the output of the RGB processing circuit 25, and the aspect ratio of the screen is 16: 9.

The conventional EDTV 2 constructed as described above
The operation of the receiver will be described below. First, the identification signal detection circuit 3 detects the identification signal multiplexed on the scanning line numbers 22 and 285 of the composite video signal from the tuner circuit 1, and B3 and B4 are 1, that is, the letterbox video is multiplexed. , And B25-27
When a sine wave for confirmation is multiplexed, the composite video signal is identified as an EDTV2 signal when some conditions are satisfied.

The identification signal detection circuit 3 enables the HH reproduction circuit 5 to output the HH signal when the identification signal B10 is 1 (there is an HH signal), and the identification signal B8 is 1 (VT). If there is a signal), the VT reproduction circuit 13
It is possible to output a VT signal from the
When 9 is 1 (there is a VH signal), the VH reproduction circuit 15 can output the VH signal.

When the identification signal detection circuit 3 determines that the composite video signal from the tuner circuit 1 is not the EDTV2 signal, the HH reproduction circuit 5, the VT reproduction circuit 13, and the VH reproduction circuit
The value of each output of the reproduction circuit 15 becomes zero. That is, the HH synthesizer 6, the VT synthesizer 14, and the VH synthesizers 21 and 22 are in a state of passing the signal of the main linear form, which is the configuration of the conventional clear vision receiver. However, if the scanning line number conversion circuit 16 is separately controlled, it can be operated as a zoom function without a vertical reinforcement signal.

[0017]

The EDTV 2 aims to be compatible with NTSC as a broadcasting system. However, for recording and playback of broadcast waves at home,
Not necessarily compatible with current NTSC equipment. If an EDTV2 receiver having the above-mentioned configuration is provided with a video output terminal and an EDTV2 signal is recorded and reproduced by a home VCR or the like, various inconveniences occur.

(1) The received EDTV2 signal is converted into the existing S
To record on a VCR with a video terminal (or video terminal), in order to avoid deterioration of the modulated HH signal by the 2D comb filter inside the VCR, perform 3D Y / C separation and HH signal playback when receiving EDTV2. It is better to record a wide band luminance signal through the S video terminal. However, if the EDTV2 identification signal is recorded in the VCR in the same waveform as it was received by the original EDTV2 receiver, the HD signal becomes an identification command. When a VCR tape on which such a signal is recorded is reproduced and input to the EDTV2 receiver, the HH demodulation circuit operates and the S / N of the main screen deteriorates even though the HH signal is not multiplexed on the main screen. There is a problem as an EDTV2 signal transmission method.

(2) The received EDTV2 signal is applied to the existing VCR with an S video terminal (or video terminal) by special processing of the VT / VH signal which is modulated and multiplexed by the color subcarrier in the upper and lower non-picture areas. If it is output without it, the VT / VH signal is deteriorated and recorded by the low frequency conversion on the VCR side and the processing of the comb filter. The VCR tape on which such a signal is recorded is reproduced and input to the EDTV2 receiver, and VT / VH
When trying to demodulate a signal, there is a problem as an EDTV2 receiver that the vertical resolution is rather deteriorated.

(3) To record the received EDTV2 signal on the existing VCR with wide S-video terminal, use EDT
Upon receiving V2, three-dimensional Y / C separation and HH signal reproduction are performed, and further scanning line interpolation processing, scanning line number conversion processing, VT reproduction, and VH reproduction are performed, and then a DC voltage is superimposed on a color signal as a squeeze signal. It is better to record by recording. However,
When the EDTV2 identification signal is recorded in the VCR in the same waveform as it was received by the original EDTV2 receiver, the squeeze identification signal and the EDTV2 identification signal are duplicated, resulting in EDTV2.
There is a problem as a signal transmission method. A VCR with a wide S-video terminal is a VCR that complies with the standards of the Japan Electronic Machinery Manufacturers Association, "Identification Signals for Video Signals with Different Aspect Ratios and Transmission Methods," and specifically, the color of the S-video terminal. When the DC voltage of the signal is 0V, the aspect ratio is 4: 3 image, 5V
In this case, the VCR has a function of identifying a squeeze signal of an image having an aspect ratio of 16: 9.

(4) V with existing wide S-video terminal
For CR, three-dimensional Y / C separation and HH signal reproduction are performed by the EDTV2 receiver, scanning line interpolation processing, scanning line number conversion processing, VT reproduction, and VH reproduction are performed, and then S is output as a squeeze signal. It is a good idea to output from the video output terminal, but on the other hand, for an existing VCR with an S video terminal, if a signal that has undergone three-dimensional Y / C separation and HH signal reproduction is output from the S video output terminal. Often, the EDTV2 receiver has a problem that it requires two S-video output terminals.

(5) To record the received EDTV2 signal on a high definition / NTSC progressive scan compatible VCR (VCR equivalent to W-VHS), three-dimensional Y / C separation, HH signal reproduction, scanning line when EDTV2 is received. After performing the interpolation process, the scanning line number conversion process, the VT reproduction, the VH reproduction, and the double speed conversion process, it is better to record the luminance signal and the color difference signal of the sequential scanning in the VCR. However, high-definition signals and EDT
There is a problem as an EDTV2 signal transmission method that is difficult to distinguish from the V2 signal.

(6) For the VCR compatible with NTSC progressive scanning, the EDTV2 receiver performs three-dimensional Y / C separation, HH signal reproduction, scanning line interpolation processing, scanning line number conversion processing, VT reproduction,
After performing VH reproduction, the luminance signal and color difference signal of progressive scanning are output from the video output terminal, while high-definition VC
For R, when the luminance signal and the color difference signal of the MUSE decoder are output from the video output terminal, there is a problem that the EDTV2 receiver with the built-in MUSE decoder needs two video output terminals.

In view of the above problems, the present invention has a VCR with an S video terminal (video terminal) and a VC with a wide S video terminal.
A method of transmitting an EDTV2 signal through a wired connection between an EDTV2 receiver and a home recording / playback device so that the EDTV2 signal can be recorded / played without any practical problem for each of the R and the VCR compatible with HDTV / NTSC progressive scan signals. And its EDTV2 receiver.

[0025]

In order to solve the above-mentioned problems, (1) a method of transmitting an EDTV2 signal according to claim 1 of the present invention is a method for transmitting luminance from a composite video signal of EDTV2 by three-dimensional Y / C separation and HH reproduction. Extract the transmission signal and color transmission signal,
In the horizontal scanning period in which the EDTV2 identification signal of the luminance transmission signal is multiplexed, the EDTV2 identification signal for issuing the identification command of the letterbox signal is added. These luminance transmission signal and color transmission signal are sent to the EDTV through the S video terminal.
2 Communicate between receiver and home recorder.

(2) The EDTV2 receiver according to claim 2 of the present invention corresponds to the method of transmitting the EDTV2 signal according to claim 1 of the present invention, and is distinguished from the three-dimensional Y / C separation circuit and the HH reproduction circuit. The signal detection circuit extracts the luminance transmission signal and the color transmission signal, passes the extracted signals through the VT / VH removal circuit and the identification signal addition circuit, and then outputs the signals from the S video output terminal. On the other hand, the luminance transmission signal and the color transmission signal input from the S video input terminal are not processed by the three-dimensional Y / C separation circuit and the HH reproduction circuit, and the identification signal is detected by the identification signal detection circuit, Determine whether to zoom.

(3) The method of transmitting an EDTV2 signal according to claim 3 of the present invention is a three-dimensional Y from a composite video signal of EDTV2.
A luminance signal and a color signal are extracted by / C separation, the HH signal, the VT signal and the VH signal are respectively demodulated and added to the luminance signal to form a luminance transmission signal, and a modulated horizontal high frequency signal is generated from the color signal. After subtraction and color demodulation, after scanning line interpolation processing and scanning line number conversion processing, it is re-modulated into a color transmission signal,
A DC voltage is superimposed on the color transmission signal, and the horizontal scanning period in which the EDTV2 identification signal is originally multiplexed with the luminance transmission signal is replaced with a black level. These luminance transmission signal and color transmission signal are transmitted between the EDTV2 receiver and the home recording device through the wide S-video terminal.

(4) The EDTV2 receiver according to claim 4 of the present invention corresponds to the EDTV2 signal transmission method according to claim 3 of the present invention. A luminance signal and a color difference signal are extracted by a three-dimensional Y / C separation circuit, an HH reproduction circuit, a VT reproduction circuit, a VH reproduction circuit, a motion adaptive scanning line interpolation circuit, a scanning line number conversion circuit, and an identification signal detection circuit, and the luminance signal is extracted. Passes through the identification signal removing circuit, and the color difference signal is output from the wide-compatible S image output terminal after superimposing the DC voltage through the color modulating circuit.
Furthermore, a signal changeover switch is provided in front of the S-video output terminal so that a signal only for HH reproduction can be output from the S-video output terminal. In that case, a DC voltage to the color output signal of the S-video output terminal is output. A voltage superposition switch that can stop superposition is provided.

(5) The method of transmitting an EDTV2 signal according to claim 5 of the present invention is a three-dimensional Y method from a composite video signal of EDTV2.
A luminance signal and a color signal are extracted by / C separation, the HH signal, the VT signal and the VH signal are respectively demodulated and added to the luminance signal, and then double speed conversion is performed to obtain a luminance transmission signal, which is then modulated from the color signal. The HH signal is subtracted to perform color demodulation, scanning line interpolation processing and scanning line number conversion processing are performed, and then double speed conversion is performed to obtain two color difference transmission signals, which are transmitted by a combination of DC voltages superimposed on the two color difference transmission signals. The feature is that the type of signal can be identified. The luminance transmission signal and the color difference transmission signal are transmitted between the EDTV2 receiver and the home recording apparatus compatible with the NTSC progressive scanning signal through the video terminal.

(6) The EDTV2 receiver according to claim 6 of the present invention corresponds to the EDTV2 signal transmission method according to claim 5 of the present invention. A three-dimensional Y / C separation circuit, an HH reproduction circuit, a VT reproduction circuit, a VH reproduction circuit, a motion adaptive scanning line interpolation circuit, a scanning line number conversion circuit, a double speed conversion circuit, and an identification signal detection circuit, and a luminance signal for sequential scanning. One color difference signal is extracted and output from a video output terminal via a signal changeover switch that switches these video signals and a high-definition luminance / color difference video signal. A combination of DC voltages to be superimposed can be set for each of the two color difference output signals of the video output terminal by an identification switch.

[0031]

[Action]

(1) According to the EDTV2 signal transmission method of claim 1 of the present invention, when the EDTV2 is received, three-dimensional Y / C separation and HH signal reproduction are performed, and at the same time, the EDTV2 identification signal in which only the letterbox identification command is set to 1 is added. By
It is possible to solve the problem that the S / N of the main screen is deteriorated due to the operation of the HH demodulation circuit even when the HH signal is not multiplexed on the main screen when recorded and reproduced on the VCR. The zoom mode can be automatically entered by detecting the letterbox identification command by the identification signal detection circuit during VCR reproduction.

(2) By the EDTV2 receiver according to claim 2 of the present invention, the VT / VH signal modulated and multiplexed by the color subcarriers in the upper and lower non-picture parts is removed by the VT / VH removing circuit and output. , VCR side low frequency conversion and comb filter processing deteriorate the VT / VH signal and record it.
It is possible to solve the problem that the vertical resolution is deteriorated during reproduction.

(3) According to the EDTV2 signal transmission method of claim 3 of the present invention, when receiving EDTV2, three-dimensional Y / C separation, HH signal reproduction, scanning line interpolation processing, scanning line number conversion processing, VT reproduction, VH reproduction. Then, by superimposing the DC voltage on the color signal as the squeeze signal and simultaneously removing the originally multiplexed EDTV2 identification signal,
It is possible to solve the problem that the information of the squeeze identification signal and the information of the EDTV2 identification signal are different from each other.

(4) After performing three-dimensional Y / C separation, HH signal reproduction, scanning line interpolation processing, scanning line number conversion processing, VT reproduction, VH reproduction by the EDTV2 receiver of claim 4 of the present invention. When the squeeze signal and the letterbox signal obtained by performing the three-dimensional Y / C separation and HH signal reproduction are selected by the signal changeover switch and then output from the S video output terminal, and when the squeeze signal side is selected, By connecting the voltage superimposing switch to the color signal output of the S-video output terminal, one S-video output terminal allows the VC with S-video terminal to be connected.
Both R and VCR with wide S-video terminal can be supported.

(5) According to the EDTV2 signal transmission method of claim 5 of the present invention, three-dimensional Y / C separation, HH signal reproduction, scanning line interpolation processing, scanning line number conversion processing, VT reproduction, VH reproduction, when receiving EDTV2, The luminance signal and the color difference signal are extracted by performing the double speed conversion process, and the high-definition signal and the EDTV are combined with the combination of the DC voltage superimposed on the two color difference signals.
It is possible to distinguish between the 2 decode signal and the NTSC progressive scan signal.

(6) With the EDTV2 receiver according to claim 6 of the present invention, when the progressive scan video output signal of the EDTV2 decoder and the video output signal of the MUSE decoder are selected by the signal switching circuit and output from the video output terminal. at the same time,
By superimposing a DC voltage on the color difference signals using two identification switches, it is possible to distinguish between high-definition signals, EDTV2 decode signals, NTSC progressive scan signals, etc., so that the EDTV2 with a built-in MUSE decoder can be identified.
It is possible to unify the double-density video output terminals in the receiver.

[0037]

【Example】

(Embodiment 1) An EDTV2 signal transmission method and an EDTV2 receiver thereof according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an interconnection diagram of an embodiment of an EDTV2 signal transmission method according to claim 1 of the present invention.

In FIG. 1, a tuner circuit 1, an identification signal detection circuit 3, a three-dimensional Y / C separation circuit 4, an HH reproduction circuit 5, an HH synthesizer 6, a color demodulation circuit 7, and an RGB processing circuit 2
5 and the display 26 are the same as those in FIG. 7, and the same reference numerals are given to omit the description.

Reference numeral 101 is an EDTV2 receiver, and S of 102
A video output terminal and an S video input terminal 103 are provided. Reference numeral 104 denotes a VCR with an S-video terminal, which has an S-video input terminal 105 and an S-video output terminal 106.

Reference numeral 107 denotes a signal changeover switch for selectively outputting the composite video signal of the tuner circuit 1 or the luminance signal from the S video input terminal 103 to the identification signal detection circuit 3.
8 is an output signal of the HH adder 6 or an S video input terminal 10
A signal changeover switch for selectively outputting the luminance signal from 3 to the RGB processing circuit 25, and 109 for selecting the output signal of the HH reproducing circuit 5 or the color signal from the S video input terminal 103 to the color demodulating circuit 7. This is a signal changeover switch for outputting.

Reference numeral 111 denotes an identification signal adding circuit, which adds an EDTV2 identification signal in which only the letterbox identification command is 1 to the luminance signal output from the signal changeover switch 108 and outputs it to the S video output terminal 102. VC with S video terminal
The R104 is composed of an input processing circuit 112, an output processing circuit 113, and a recording / reproducing unit 114. After the luminance signal and the color signal input from the S-video input terminal 105 are processed by the input processing circuit 112. The video signal recorded in the recording / reproducing unit 114 and reproduced from the recording / reproducing unit 114 is processed by the output processing circuit 113 and then output from the S-video output terminal 106.

The operation of the interconnection diagram of the EDTV2 signal transmission method configured as described above will be described below. The video received by the tuner circuit 1 is displayed on the display 2
6, the signal changeover switch 107 is to the tuner circuit 1, 108 is to the HH adder 6, and 109 is to HH.
Each is connected to the reproduction circuit 5. When the composite video signal output from the tuner circuit 1 is multiplexed with the EDTV2 identification signal, and the result detected by the identification signal detection circuit 3 is 1 for each of the letterbox and HH signal identification commands, the identification signal detection circuit 3 Controls the HH reproduction circuit 5 so that the vertical deflection amplitude is multiplied by 4/3, and the main image portion is zoom-displayed on the display 26 by interlaced scanning.

From the S-video output terminal 102, three-dimensional Y /
The luminance signal and the color signal processed by the C separation circuit 4 and the HH reproduction circuit 5 are output. To the luminance signal, an identification signal addition circuit 111 adds an EDTV2 identification signal whose identification command for the letter box is 1. Since the letterbox identification command is not modulated, it can be recorded as the luminance signal of the VCR 104 with S-video terminal.

As described above, the VCR 1 with the S image terminal
When the video signal recorded in 04 is viewed on the EDTV2 receiver 101, all of the signal changeover switches 107 to 9 are S.
Each is connected to the video input terminal 103. The identification signal detection circuit 3 detects a letterbox identification command multiplexed with the luminance signal from the S-video input terminal 103 and controls the vertical deflection amplitude to be 4/3 times. On the other hand, the horizontal band of the luminance signal input from the S video input terminal 103 is extended. In this way, E
The VCR10 with S-video terminal has the same image quality and operability (automatic zoom function) as when receiving a DTV2 signal.
It can be realized when recording and reproducing to 4.

Further, since the signal changeover switch 107 is provided at the input stage of the identification signal detection circuit 3, the tuner circuit 1 receives the broadcast wave and the VCR 104 with the S video terminal.
There is also an advantage that the identification signal detection circuit can be shared with the case of reproducing.

(Embodiment 2) FIG. 2 is a circuit block diagram of an embodiment of an EDTV 2 receiver corresponding to claim 2 of the present invention. In FIG. 2, a circuit is added to the conventional EDTV receiver described in FIG.

In FIG. 2, an identification signal detecting circuit 3, a three-dimensional Y / C separating circuit 4, an HH reproducing circuit 5, an HH synthesizer 6,
The color demodulation circuit 7 is the same as that of FIG. 7, and the S video output terminal 102, the S video output terminal 103, and the signal changeover switch 1 are also included.
07 to 9 are the same as those in FIG. 1, and the same numbers are assigned and the description thereof is omitted.

201 is a horizontal / vertical sync pulse input terminal,
A counter 202 receives a signal from the horizontal / vertical sync pulse input terminal 101 as an input and detects a scanning line number. Two
03 receives the luminance output signal of the HH synthesizer 6 and the color output signal of the HH reproducing circuit 5 as input, and outputs VT / from the luminance signal and the color signal for the area designated by the counter 202.
It is a low pass filter for removing the VH signal.

Reference numeral 204 is an identification signal addition circuit which receives the output signal of the low-pass filter 203 as an input and adds an identification command not to multiplex HH / VT / VH to the scanning line designated by the counter 202. A D / A converter 205 receives the output signal of the identification signal adding circuit 204 as an input. Reference numerals 206 and 207 are capacitors for removing DC components from the luminance output signal and the color output signal of the D / A converter 205, and 208 and 209 are 75Ω resistors for determining the output impedance.

Reference numeral 210 is a video synthesizer for adding a luminance output signal and a color output signal of the D / A converter 205 to create a composite video signal, and 211 is a capacitor for removing a DC component from the output signal of the video synthesizer 210. , 212 are 75Ω resistors that determine the output impedance, and 213 is a video output terminal.

The operation of the EDTV2 receiver configured as described above will be described below. When the identification signal detection circuit 3 determines that the input composite video signal is the EDTV2 signal, it enables the counter 202 and the HH reproduction circuit 5 to operate.

The counter 202 operates the low-pass filter 203 by detecting a period of 30 scanning lines / field of each of the upper non-picture area and the lower non-picture area. Further, the counter 202 originally had the EDTV2 identification signal multiplexed.
The second and 285th scanning lines are detected and the identification signal adding circuit 204 is operated.

After all, the luminance signal output from the S video output terminal 102 has a wide band of 6 MHz, and the VT / VH signals in the upper and lower non-picture areas are removed in order to maintain compatibility with the current television. Furthermore, since the EDTV2 identification signal is multiplexed, the main screen can be automatically zoomed when it is re-input to the EDTV2 receiver. The video output terminal 213 is compatible with VCRs that do not have an S video terminal.
For recording DTV2 signal, horizontal band is VC
Although it decreases according to the performance of R, the function of automatically entering the zoom by the identification signal can be realized.

Further, the low-pass filter 203 has a circuit configuration in which the luminance signal is replaced with the black level and the color signal is replaced with the colorless signal by V.
Although the purpose of removing the T / VH signal can be achieved, the low-pass filter 203 has an advantage that it is easier to follow the black level of the input video signal.

(Embodiment 3) FIG. 3 is an interconnection diagram in an embodiment of an EDTV2 signal transmission method according to claim 3 of the present invention. In FIG. 3, a tuner circuit 1, an identification signal detection circuit 3, a three-dimensional Y / C separation circuit 4, an HH reproduction circuit 5, an HH synthesizer 6, a color demodulation circuit 7, an RGB processing circuit 2
5 and the display 26 are the same as those in FIG. 7, and the same reference numerals are given to omit the description.

Reference numeral 301 is an EDTV2 receiver, and S of 302
A video output terminal and an S video input terminal 303 are provided. 304 is a VCR with a wide S-video terminal,
The S video input terminal 5 and the S video output terminal 306 are provided.

Reference numerals 307 to 9 are signal changeover switches, 310 is a scanning line processing circuit, and the signal changeover switch 307 prohibits transmission of a control signal from the identification signal detection circuit 3 to the scanning line processing circuit 310, and the signal changeover switch 308. Is the HH adder 6
Output signal or the luminance signal from the S video input terminal 303 is output to the scanning line processing circuit 310, and the signal changeover switch 309 outputs the output signal of the HH reproduction circuit 5 or the color signal from the S video input terminal 303. The selected one is output to the color demodulation circuit 7.

The internal circuit of the scanning line processing circuit 310 is the circuit block diagram of the conventional EDTV2 receiver shown in FIG.
Motion adaptive scanning line interpolation circuit 8, VT reproducing circuit 13, VT synthesizer 14, VH reproducing circuit 15, scanning line number converting circuit 16,
The VH synthesizer 21 has a circuit equivalent to that of the VH synthesizer 21, and the luminance current line output signal of the VH synthesizer 21 and the scanning line number conversion circuit 1
The color difference current line output signal 19 of 6 is output.

Reference numeral 311 denotes an identification signal removing circuit which removes the EDTV2 identification signal remaining in the luminance output signal of the scanning line processing circuit 310 and replaces it with a black level. A color modulation circuit 312 modulates the color difference output signal of the scanning line processing circuit 310 with a color subcarrier. A DC voltage superimposing circuit 313 superimposes a DC 5V voltage on the color output signal of the color modulating circuit 312. From the S video output terminal 302, the identification signal removing circuit 3
The luminance output signal 11 and the color output signal of the color modulation circuit 312 are output. A DC voltage detection circuit 314 detects a DC voltage superimposed on the color input signal of the S-video input terminal 303.

Wide VCR 304 with S video terminal
Is connected to the color input signal of the S video input terminal 305.
16 DC voltage detection circuits, 317 DC voltage superposition circuit 318 connected to the color output signal of the S video output terminal 306
Input processing circuit 319, output processing circuit 319, and recording / reproducing unit 320. The luminance signal and color signal input from the S-video input terminal 305 are processed by the input processing circuit 318, and then the recording / reproducing unit. The video signal recorded in 320 and reproduced from the recording / reproducing unit 320 is processed by the output processing circuit 319 and then output from the S video output terminal 306.

The operation of the interconnection diagram of the EDTV2 signal transmission method configured as described above will be described below. The video received by the tuner circuit 1 is displayed on the display 2
6, the signal changeover switch 307 goes to the identification signal detection circuit 3, 308 goes to the HH adder 6, and 309 goes to H.
Each is connected to the H reproduction circuit 5.

The EDTV2 identification signal is multiplexed with the composite video signal output from the tuner circuit 1, and the result detected by the identification signal detection circuit 3 is the letter box and H level.
When the identification commands of the H / VT / VH signals are 1, the identification signal detection circuit 3 activates the HH reproduction circuit 5 and also performs the 4/3 times scanning line number conversion of the scanning line processing circuit 310 and VT / VH. The demodulation and are activated, and the main image portion is zoom-displayed on the display 26 by interlaced scanning.

From the S image output terminal 302, three-dimensional Y /
C separation circuit 4, HH reproduction circuit 5, and scanning line processing circuit 310
The luminance signal and the color signal processed by are output. The 22nd and 285th scanning lines of the luminance signal are replaced with a black level by the identification signal removing circuit 311, and a DC voltage superimposing circuit 313 superimposes a DC 5V voltage on the color signal.

This DC 5V voltage is a VC with an S image terminal.
It is detected by the DC voltage detection circuit 316 of R304 and recorded as a squeeze signal in the recording / reproducing unit 320, and at the time of reproduction, the DC voltage superposition circuit 317 causes the S video output terminal
The 5V DC voltage is superimposed on the 6 color output signals.

When the video signal recorded in the VCR 304 with S-video terminal corresponding to the wide area is viewed on the EDTV2 receiver 301 as described above, the signal changeover switches 308 and 9 are connected to the S-video input terminal 303, respectively. The DC voltage detection circuit 314 detects the identification voltage of the squeeze signal superimposed on the color signal from the S-video input terminal 303, and detects the DC voltage 5
In the case of V, the signal changeover switch 307 is connected to the 0 side.

As a result, the scanning line processing circuit 310 stops the processing such as scanning line number conversion and VT / VH reproduction, and the extended luminance signal of the horizontal and vertical bands input from the S video input terminal 303 is directly displayed on the display 26. Is displayed in. In this manner, the image quality and the operability (the function of automatically squeezing the display) substantially equal to those when the tuner circuit 1 receives the EDTV2 signal are obtained, and the V-compatible S-video terminal-equipped V-compatible terminal is used.
It can be realized at the time of recording / reproducing to / from CR304.

(Embodiment 4) FIG. 4 is a circuit block diagram in an embodiment of an EDTV 2 receiver corresponding to claim 4 of the present invention. In FIG. 4, a circuit is added to the conventional EDTV receiver explained in FIG. 4, the identification signal detection circuit 3, the HH reproduction circuit 5, the HH combiner 6, the color demodulation circuit 7, the VT reproduction circuit 13, the VT combiner 14, the VH reproduction circuit 15, the scanning line number conversion circuit 16, and the VH.
The synthesizers 21 and 22 and the double speed conversion circuit 23 are the same as those in FIG. 7, and the S-video output terminal 302 and the S-video input terminal 30 are used.
3, signal changeover switches 307-9, identification signal removal circuit 3
11. The color modulation circuit 312 is the same as that in FIG. 3, and the same reference numerals are given to omit the description.

A D / A converter 401 receives the luminance output signal of the identification signal removal circuit 311 and the color output signal of the scanning line number conversion circuit 16. 402 is a D / A converter 40
A luminance signal changeover switch for selecting the luminance output signal of No. 1 or the output signal of the HH synthesizer 6, 403 is a color modulation circuit 31
2 or a color signal changeover switch for selecting the output signal of the HH reproduction circuit 5.

Reference numerals 404 and 405 are capacitors for removing DC components from the output signals of the luminance signal changeover switch 402 and the color signal changeover switch 403, and 406 and 407 are 75Ω resistors for determining the output impedance. 408 is 1
A resistor having an impedance of about 0 kΩ, 409 a voltage superimposing switch, and 410 a 5V DC voltage, which are examples of the internal circuit configuration of the DC voltage superimposing circuit 313 in FIG. 3 described above.

When the switch 409 is closed, the DC signal of 5V potential is superimposed on the color signal of the S image output terminal 302 through the resistor 408, and is used as an identification when transmitting a squeeze signal (horizontal compressed wide image). It

The operation of the EDTV2 receiver configured as described above will be described below. E shown in FIG.
The main difference from the EDTV2 receiver 301 in one embodiment of the DTV2 signal transmission method is the luminance signal changeover switch 40.
2 and the color signal changeover switch 403.

These switches are connected to the HH synthesizer 6 and the HH regeneration circuit 5 side, and the voltage superposition switch 409 is connected.
, The letterbox signal is sent to the S video output terminal 3
Can be output from 02. Also, the brightness signal changeover switch 40
2 and the color signal changeover switch 403 together with the D / A converter 40.
1 and the color modulation circuit 312 side and the voltage superposition switch 409 is closed, the squeeze signal can be output from the S video output terminal 302. In this way, one S-video output terminal 302 is shared, and a wide-compatible VCR is used.
Output a squeeze signal to a VC that is not compatible with wide
It becomes possible to output a letterbox signal to R or switch and output.

(Embodiment 5) FIG. 5 is an interconnection diagram in an embodiment of an EDTV2 signal transmission method corresponding to claim 5 of the present invention. In FIG. 5, a tuner circuit 1, an identification signal detection circuit 3, a three-dimensional Y / C separation circuit 4, an HH reproduction circuit 5, an HH synthesizer 6, a color demodulation circuit 7, and a double speed conversion circuit 2
3, the RGB processing circuit 25, and the display 26 are the same as those in FIG. 7, and the same reference numerals are given to omit the description.

Reference numeral 501 denotes an EDTV2 receiver, which has a video output terminal 502 and a video input terminal 503. 5
Reference numeral 04 denotes an NTSC progressive scan VCR, which is provided with a video input terminal 505 and a video output terminal 506. These video input / output terminals input / output a progressive scanning luminance signal and two color difference signals. 509 to 11 are signal changeover switches, which are output signals of the double speed conversion circuit 23 or the video input terminal 5
The signal from 03 is selected and output to the RGB processing circuit 25.

Reference numeral 507 is a scanning line processing circuit, and the internal circuit is the motion adaptive scanning line interpolation circuit 8, VT reproducing circuit 13, V in the circuit block diagram of the conventional EDTV2 receiver shown in FIG.
T combiner 14, VH reproduction circuit 15, scanning line number conversion circuit 1
6, VH synthesizers 21 and 22. 5
Reference numerals 12 and 516 denote DC voltage superimposing circuits, which are video output terminals 50.
The DC potentials of the color difference signals output from 2 and 506 are independently set to 5V or 0V. 51
DC voltage detection circuits 3 and 515 are provided for the video input terminal 50.
A voltage comparator detects whether the DC potentials of the two color difference signals input from the circuits 3 and 505 are 5V or 0V, respectively.

The VCR 504 compatible with NTSC progressive scan is D
C voltage detection circuit 515, DC voltage superposition circuit 516, 51
7 input processing circuit, 518 output processing circuit, and 519 recording / reproducing section. The luminance signal and color difference signal input from the video input terminal 505 are processed by the input processing circuit 517, and then the recording / reproducing section. The video signal recorded in 519 and reproduced from the recording / reproducing unit 519 is processed by the output processing circuit 518 and then output from the video output terminal 506.

The operation of the interconnection diagram of the EDTV2 signal transmission method configured as described above will be described below. The video received by the tuner circuit 1 is displayed on the display 2
6 is displayed, the signal changeover switches 509 to 511
Is connected to the double speed conversion circuit 23 side.

The EDTV2 identification signal is multiplexed in the composite video signal output from the tuner circuit 1, and the result detected by the identification signal detection circuit 3 is the letterbox and H level.
When the identification commands of the H / VT / VH signals are respectively 1, the identification signal detection circuit 3 activates the HH reproduction circuit 5 and converts the scanning line processing circuit 507 into 4/3 times the number of scanning lines and VT / VH. The demodulation and are operated to display the main image portion on the display 26 in a sequential scanning manner by zooming. Video output terminal 502
From, the luminance signal and the color difference signal of the progressive scanning output from the double speed conversion circuit 23 are output.

At this time, the DC voltage superimposing circuit 5 is added to the color difference signals.
The DC potential is set by 12. This DC potential is NT
DC voltage detection circuit 51 of VCR 504 compatible with SC progressive scanning
It is determined that the signal detected in 5 and the signal obtained by decoding the EDTV2 signal is input. DC voltage superposition circuit 5 during playback
16, the DC potential of the same combination as that detected by the DC voltage detection circuit 515 at the time of recording is set to the color difference output signal of the video output terminal 506.

As described above, NTSC progressive scan compatible V
The video signal recorded in the CR504 is sent to the EDTV2 receiver 5
When watching with 01, signal changeover switches 509 to 511
Is connected to the video input terminal 503 side. The DC voltage detection circuit 513 detects the DC potential of the color difference signal from the video input terminal 503, sets the matrix ratio of the RGB processing circuit 25, and sets the correction amount of the image quality circuit such as horizontal contour correction. In this way, the tuner circuit 1 almost eliminates the EDT.
The same image quality as when receiving the V2 signal can be realized during recording / playback on the VCR 504 compatible with NTSC progressive scanning.

(Embodiment 6) FIG. 6 is a circuit block diagram in an embodiment of an EDTV 2 receiver corresponding to claim 6 of the present invention. FIG. 6 shows a configuration in which a circuit is added to the conventional EDTV receiver described in FIG. In FIG. 6, the identification signal detection circuit 3, the double speed conversion circuit 23, D /
A converter 24, RGB processing circuit 25, display 26
7 is the same as FIG. 7, and also includes a video output terminal 502, a video input terminal 503, signal changeover switches 509 to 511, and D.
The C voltage detection circuit 513 is the same as that in FIG. 5, and the same numbers are assigned and the description thereof is omitted.

Reference numeral 601 denotes an MU built in the EDTV2 receiver.
Luminance signal and color difference signal Y / Pb / P from SE decoder
r is an HD signal input terminal, 602 is an external control signal input terminal, and 603 is an NTSC progressive scan signal from the D / A converter 24 for HD / Yb / HD
It is a matrix circuit for converting into a Pr matrix ratio.

Numerals 604 to 6 are signal changeover switches, which are the video input terminal 503 or the high-definition signal input terminal 60.
The signal from 1 is selected and output to the RGB processing circuit 25. Reference numerals 607 to 9 denote operational amplifiers that convert the outputs of the signal changeover switches 509 to 511 into low impedance outputs.

Reference numerals 610-2 are capacitors for removing DC components from the output signals of the operational amplifiers 607-9, and reference numerals 613-5 are 75Ω resistors for determining the output impedance. 616
And 617 are resistors with impedance of about 10 kΩ, 61
Reference numerals 8 and 619 are identification switches, and 620 is a DC voltage of 5V, which realizes the DC voltage superimposing circuit 512 of FIG. A switching control unit 621 controls the signal switching switches 509 to 511 and the identification switches 618 and 619 based on the signal from the external control terminal 602 and the information from the identification signal detection circuit 3.

The operation of the EDTV2 receiver configured as described above will be described below. This embodiment assumes that the EDTV2 receiving circuit and the high-definition receiving circuit are built in the same receiver. In this case, the video output terminal 502 is desired to be shared by the EDTV2 receiving circuit and the high-definition receiving circuit. Therefore, the signals of the receiving circuits are selected by the signal change-over switches 604 to 6, and it is easier for the device receiving the output signal from the video output terminal 502 to have a common luminance / color difference signal matrix for both. , Here N in the matrix circuit 603
The matrix of the TSC system (including EDTV2) is adapted to the high definition system.

In this way, the video output terminal 502 can be shared by both receiving circuits, but for a device that receives the signal, a video signal having a different sync frequency or image quality is output from the same video output terminal 502. I want to add some identification signal.

Therefore, the switching control unit 621 controls the discrimination switches 616 and 617 to enable discrimination in four combinations of DC potentials of the color difference output signals of the video output terminal 502. For example, when it is (0V, 0V), it is identified as a high-definition system, and when it is (5V, 5V), it is identified as an EDTV2 system. Furthermore, the remaining two modes (5V, 0V) and (0
Since it is possible to input the information of the identification detection circuit 3 to the switching control unit 621, it is possible to identify the image quality difference due to the presence or absence of the VT / VH reproduction processing.

[0088]

As described above, according to the present invention, existing VCRs such as a VCR with an S video terminal (or a video terminal), a VCR with a wide-compatible S video terminal, and a VCR compatible with a high-definition / NTSC progressive scan signal are used. , EDTV2 that can record and reproduce EDTV2 signals without any practical problems
E by wired connection between receiver and home recording / playback device
A DTV2 signal transmission method and an EDTV2 receiver thereof can be provided.

(1) According to the method of transmitting the EDTV2 signal of claim 1 of the present invention, when the signal of the EDTV2 is received, the luminance transmission signal and the color transmission signal are extracted by three-dimensional Y / C separation and HH reproduction, In the horizontal scanning period in which the EDTV2 identification signal of the luminance transmission signal is multiplexed, the EDTV2 identification signal that sets the identification command of the letterbox signal is added, and these luminance transmission signal and color transmission signal are transmitted to the EDTV2 receiver. VCR with existing S video terminal (or video terminal)
It is possible to avoid the deterioration of the modulated HH signal by the two-dimensional comb filter inside the VCR by recording and reproducing between and. Also, by newly adding the EDTV2 identification signal, the originally received EDTV2 identification signal remains in the VCR during reproduction, and the HH demodulation circuit operates even though the HH signal is not multiplexed on the main screen. In addition to solving the problem that S / N of the main screen deteriorates, V
During CR reproduction, it is possible to automatically enter the zoom by detecting the identification signal. Further, the identification signal detection circuit is an EDT
One for receiving V2 broadcast and one for VCR reproduction can be shared.

(2) According to the EDTV2 receiver of claim 2 of the present invention, the luminance transmission signal and the color transmission signal are extracted and extracted by the three-dimensional Y / C separation circuit, the HH reproduction circuit, and the identification signal detection circuit. By passing the signal through the VT / VH removing circuit and the identification signal adding circuit and then outputting it from the S-video output terminal, the VC with the existing S-video terminal (or video terminal) is output.
R, V, which is modulated and multiplexed with color subcarriers in the upper and lower non-image areas
When the T / VH signal is output without any special processing, the VT is processed by the low frequency conversion on the VCR side and the comb filter processing.
It is possible to solve the problem that the / VH signal is deteriorated and recorded, and when the VCR tape on which such a signal is recorded is reproduced to demodulate the VT / VH signal, the vertical resolution is rather deteriorated. Furthermore, by configuring the VT / VH removal circuit by a low-pass filter instead of signal replacement, the black level of the input video signal can be preserved, and black floating or black sinking in the upper and lower non-image areas of the letterbox video signal can be prevented. be able to.

(3) According to the method of transmitting the EDTV2 signal of claim 3 of the present invention, the three-dimensional Y /
C separation, HH reproduction, VT / VH reproduction, scanning line interpolation processing and scanning line number conversion processing are performed to extract a luminance transmission signal and a color transmission signal, and a DC potential is superimposed on this color transmission signal, and the luminance transmission is performed. In the horizontal scanning period in which the EDTV2 identification signal is originally multiplexed by the signal, the received EDTV2 signal is replaced with the squeeze identification signal when the received EDTV2 signal is recorded and reproduced in the existing VCR with a wide S-video terminal. It is possible to avoid the inconvenience that the EDTV2 identification signal is duplicated to cause confusion.

(4) According to the EDTV2 receiver of claim 4 of the present invention, the three-dimensional Y / C separation circuit, the HH reproduction circuit, and the V
A T reproduction circuit, a VH reproduction circuit, a motion adaptive scanning line interpolation circuit, a scanning line number conversion circuit, and an identification signal detection circuit extract a luminance signal and a color difference signal, and the luminance signal passes through an identification signal removal circuit, and further, an S image. A signal changeover switch is provided in front of the output terminal so that a signal only for HH reproduction can be output by changing over from the S-video output terminal. The DC voltage to the color output signal of the S-video output terminal is interlocked with the signal changeover switch. By providing a voltage superimposition switch that can stop the superimposition of
For existing VCRs with wide S-video terminals, squeeze signals can be output from the S-video output terminal, while for existing VCRs with S-video terminals, letterbox signals can be output from the S-video output terminal. .

(5) According to the EDTV2 signal transmission method of claim 5 of the present invention, when the EDTV2 broadcast is received, three-dimensional Y / C separation, HH signal reproduction, VT / VH signal reproduction, and scanning line interpolation processing are performed. A luminance transmission signal and a color difference transmission signal (RY / B) of sequential scanning are performed by the scanning line number conversion process and the double speed conversion process.
-Y) and four types of combinations of DC potentials (0V, 0V), (0V, 5), which are extracted and are superimposed on the two color difference transmission signals.
V), (5V, 0V), (5V, 5V), EDT
The types of video signals such as V2 decode signal, high-definition signal, and NTSC progressive scan signal can be reliably and easily identified. As a result, in the receiver and the VCR, it is possible to reliably set the frequency pull-in range of the synchronizing circuit and the image quality circuit.

(6) According to the EDTV2 receiver of claim 6 of the present invention, the three-dimensional Y / C separation circuit, the HH reproduction circuit, and the V
A T reproduction circuit, a VH reproduction circuit, a motion adaptive scanning line interpolation circuit, a scanning line number conversion circuit, a double speed conversion circuit, and an identification signal detection circuit extract a luminance signal and two color difference signals for sequential scanning,
These video signals are output from the video output terminal via a signal changeover switch that switches between the high-definition luminance / color difference video signal, and the two color difference output signals of the video output terminals are each provided with a DC voltage that is superimposed by an identification switch. By enabling the combination to be set in conjunction with the signal changeover switch, it is possible to provide a high-definition signal and an ED for a high-definition / NTSC progressive scan signal-compatible VCR by providing only one video output terminal with a horizontal frequency of 30 kHz.
Both TV2 decoded signals can be output with an identification signal.

[Brief description of drawings]

FIG. 1 is an EDTV according to an embodiment of claim 1 of the present invention.
Two signal transmission method interconnection diagram

FIG. 2 is an EDTV according to an embodiment of claim 2 of the present invention.
2 Receiver circuit block diagram

FIG. 3 is an EDTV according to an embodiment of claim 3 of the present invention.
Two signal transmission method interconnection diagram

FIG. 4 is an EDTV according to an embodiment of claim 4 of the present invention.
2 Receiver circuit block diagram

FIG. 5 is an EDTV according to an embodiment of claim 5 of the present invention.
Two signal transmission method interconnection diagram

FIG. 6 is an EDTV according to an embodiment of claim 6 of the present invention.
2 Receiver circuit block diagram

FIG. 7 is a circuit block diagram of a conventional EDTV2 receiver.

FIG. 8 is a schematic diagram for explaining a method of multiplexing video signals of EDTV2 broadcasting system.

FIG. 9 is a waveform diagram of an EDTV2 identification signal.

[Explanation of symbols]

 1 tuner circuit 3 identification signal detection circuit 4 three-dimensional Y / C separation circuit 5 HH reproduction circuit 6 HH synthesizer 7 color demodulation circuit 8 motion adaptive scanning line interpolation circuit 13 VT reproduction circuit 14 VT synthesizer 15 VH reproduction circuit 16 scanning line Number conversion circuit 21 VH synthesizer 22 VH synthesizer 23 Double speed conversion circuit 25 RGB processing circuit 26 Display 101 EDTV2 receiver 102 S video output terminal 103 S video input terminal 104 SCR with video terminal VCR 105 S video input terminal 106 S video output Terminals 107 to 9 Signal changeover switch 111 Identification signal addition circuit 112 Input processing circuit 113 Output processing circuit 114 Recording / playback unit 202 Counter 203 Low-pass filter 204 Identification signal addition circuit 213 Video output circuit 301 EDTV2 receiver 302 S video output Terminal 303 S video input Input terminal 304 Wide compatible S video terminal VCR 305 S video input terminal 306 S video output terminal 307-9 Signal changeover switch 311 Identification signal removal circuit 312 Color modulation circuit 313 DC voltage superposition circuit 314 DC voltage detection circuit 316 DC voltage detection circuit 317 DC voltage superposition circuit 318 Input processing circuit 319 Output processing circuit 320 Recording / reproducing section 402 Luminance signal changeover switch 403 Color signal changeover switch 409 Voltage superposition switch 501 EDTV2 receiver 502 Video output terminal 503 Video input terminal 504 NTSC progressive scan compatible VCR 505 video input terminal 506 video output terminal 509-511 signal changeover switch 512 DC voltage superposition circuit 513 DC voltage detection circuit 515 DC voltage detection circuit 516 DC voltage superposition circuit 517 input processing circuit 518 Output processing circuit 519 Recording / playback unit 601 High-definition signal input terminal 604-6 Signal changeover switch 618-9 Identification switch 621 Changeover control unit

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display area H04N 11/24

Claims (6)

[Claims] 1. A composite video signal from the EDTV 2 is 3
A luminance signal and a color signal are extracted by dimension Y / C separation and horizontal high frequency reproduction, and (2) the color signal is used as a color transmission signal,
(3) An EDTV2 identification signal with a letterbox identification command is added during the horizontal scanning period in which the EDTV2 identification signal of the luminance signal is multiplexed to form a luminance transmission signal. (4) The luminance transmission signal and color When receiving the transmission signal, the three-dimensional Y / C separation and horizontal high frequency reproduction are not performed, but E
The ED is characterized in that the identification signal of the DTV 2 is detected.
An EDTV2 signal transmission method between a TV2 receiver and a home recording device. 2. A composite video signal input terminal, an identification signal detection circuit for detecting an identification signal of the EDTV 2 from the composite video signal applied to the input terminal, and a composite video signal applied to the input terminal as inputs. A three-dimensional Y / C separation circuit, an HH reproduction circuit for reproducing a horizontal high frequency signal from the color output signal of the three-dimensional Y / C separation circuit, and a HH for the luminance output signal of the three-dimensional Y / C separation circuit. An HH combiner for adding the horizontal high frequency output signal of the reproducing circuit, and a V for removing the vertical time resolution enhancement signal and the vertical high frequency signal included in the luminance output signal of the HH synthesizer and the color output signal of the HH reproducing circuit.
A T / VH removing circuit, an identification signal adding circuit for adding an EDTV2 identification signal to the luminance output signal and the color output signal of the VT / VH removing circuit, and an S video output terminal for outputting the output signal of the identification signal adding circuit. EDTV2 reception, characterized in that when the composite video signal is identified as an EDTV2 signal by the identification signal detection circuit, the VT / VH removal circuit and the identification signal addition circuit are put into an operating state. Machine. 3. (1) 3 from composite video signal of EDTV2
Extract the luminance signal and chrominance signal by dimension Y / C separation,
(2) A horizontal high frequency signal, a vertical temporal resolution enhancement signal and a vertical high frequency signal are respectively demodulated and added to the luminance signal to obtain a luminance transmission signal, and (3) a modulated horizontal high frequency signal is subtracted from the color signal. Then, after performing color demodulation, scanning line interpolation processing and scanning line number conversion processing, re-modulation is performed to obtain a color transmission signal, and (4) a DC voltage is superimposed on the color transmission signal and the luminance transmission signal is used. The horizontal scanning period in which the EDTV2 identification signal is originally multiplexed is replaced with a black level.
EDTV2 between EDTV2 receiver and home recording device
Signal transmission method. 4. An input terminal for a composite video signal, an identification signal detection circuit for detecting an identification signal of the EDTV 2 from the composite video signal applied to the input terminal, and an input for the composite video signal applied to the input terminal. A three-dimensional Y / C separation circuit, an HH reproduction circuit for reproducing a horizontal high frequency signal from the color output signal of the three-dimensional Y / C separation circuit, and a HH for the luminance output signal of the three-dimensional Y / C separation circuit. An HH combiner to which a horizontal high-frequency output signal of the reproducing circuit is added, a color demodulating circuit for demodulating a color output signal of the HH reproducing circuit, and output signals of the HH adder and the color demodulating circuit are input to double density. Motion-adaptive scanning line interpolating circuit for synthesizing the interpolating line signal, the VT reproducing circuit for reproducing the vertical time resolution reinforcing signal from the composite video signal applied to the input terminal, and the vertical high range from the output signal of the VT reproducing circuit. A VH reproduction circuit for reproducing a signal,
A VT synthesizer for adding a vertical time resolution enhancing output signal of the VT reproducing circuit to a luminance interpolation line output signal of the motion adaptive scanning line interpolation circuit, and a luminance current line output signal and a color signal output signal of the motion adaptive scanning line interpolation circuit And a scanning line number converting circuit for synthesizing four scanning lines from three scanning lines by inputting the output signal of the VT synthesizer and an output signal of the VH reproducing circuit to a luminance output signal of the scanning line number converting circuit. A VH synthesizer for adding the VH synthesizer, an identification signal removing circuit for removing the identification signal from the current line output signal of the VH synthesizer, and a color modulating circuit for remodulating the color difference output signal of the current line of the scanning line number converting circuit. A luminance signal changeover switch for selecting and outputting a luminance output signal of either the identification signal removing circuit or the HH synthesizer, and a color output of either the color modulating circuit or the HH reproducing circuit. A color signal changeover switch that selects and outputs a signal, a voltage superimposition switch that applies a DC voltage to the color output signal of the color modulation circuit, and an output signal of the luminance signal changeover switch and the color signal output switch S An EDTV 2 receiver, comprising an image output terminal, wherein switching of the voltage superimposing switch is performed in synchronization with switching of the luminance signal changeover switch and the color signal changeover switch. 5. (1) 3 from composite video signal of EDTV2
A luminance signal and a color signal are extracted by the dimension Y / C separation,
(2) After demodulating and adding a horizontal high frequency signal, a vertical time resolution enhancement signal and a vertical high frequency signal to the luminance signal,
Double-speed conversion into a luminance transmission signal, (3) subtracting the modulated horizontal high-frequency signal from the color signal to perform color demodulation, scanning line interpolation processing and scanning line number conversion processing, and then double-speed conversion to obtain two color differences EDTV2 between the EDTV2 receiver and the recording device for home use, characterized in that (4) the type of the transmission signal can be identified by the combination of the DC voltage superimposed on the two color difference transmission signals. Signal transmission method. 6. A composite video signal input terminal, an identification signal detection circuit for detecting an identification signal of the EDTV 2 from the composite video signal applied to the input terminal, and a composite video signal applied to the input terminal as inputs. A three-dimensional Y / C separation circuit, an HH reproduction circuit for reproducing a horizontal high frequency signal from the color output signal of the three-dimensional Y / C separation circuit, and a HH for the luminance output signal of the three-dimensional Y / C separation circuit. An HH combiner for adding the horizontal high-frequency output signal of the reproducing circuit, a color demodulating circuit for demodulating the color output signal of the HH reproducing circuit, and a double dense input with each output signal of the HH combiner and the color demodulating circuit as input. A motion adaptive scanning line interpolating circuit for synthesizing an interpolating line signal, a VT reproducing circuit for reproducing a vertical time resolution reinforcing signal from a composite video signal applied to the input terminal, and a vertical high frequency region from an output signal of the VT reproducing circuit. A VH reproduction circuit for reproducing a signal,
A VT synthesizer for adding a vertical time resolution enhancing output signal of the VT reproducing circuit to a luminance interpolation line output signal of the motion adaptive scanning line interpolation circuit, and a luminance current line output signal and a color signal output signal of the motion adaptive scanning line interpolation circuit And a scanning line number conversion circuit for synthesizing four scanning lines from three scanning lines by inputting the output signal of the VT synthesizer and an output signal of the VH reproduction circuit to a luminance output signal of the scanning line number conversion circuit. A VH synthesizer for adding a VH synthesizer, a double speed conversion circuit for producing a sequential scanning signal by using the output signal of the VH synthesizer and the color difference output signal of the scanning line number conversion circuit as an input, and a sequential scanning output signal of the double speed conversion circuit as an input. A matrix circuit, a high-definition Y color difference signal is input to the high-definition input terminal, a signal from the high-definition input terminal and an output signal of the matrix circuit. And the signal changeover switch changing Ri,
A video output terminal for outputting a luminance output signal and two color difference output signals of the signal changeover switch, and two identification switches for independently applying a DC voltage to the two color difference signal output terminals of the video output terminal are provided. An EDTV2 receiver characterized by controlling opening and closing of the two identification switches according to a selection state of the signal changeover switch and a detection result of the identification signal detection circuit.