JPH09149382A - Identification signal processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably detect a letter box signal even unless the full decoding of an identification control signal of a second-generation high quality television(EDTV-II), for example, is executed. SOLUTION: An identification signal processor is constituted of an input part 6 where a video signal superimposed on the identification control signal is inputted, an EDTV-II signal detecting equipment 7 detecting the existence of the identification control signal, a B3 detecting equipment 8 detecting bit information B3 of the letter box signal of the identification control signal, a longitudinal no-picture part signal detecting equipment 30 detecting the letter box from the black display level of a longitudinal no-picture part in the EDTV-II signal, a letter box judging equipment 9 judging whether or not the signal is the letter box signal from the results and an output part 10. Thus, it is recognized that the longitudinal no-picture part is the black display level so as to judge letter box information so that the letter box signal is surely and stable detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an identification signal processing device, and more particularly, to an identification signal processing for improving the identification signal processing of, for example, a second-generation high-definition television so that a letterbox signal can be accurately detected. It relates to the device.

[0002]

2. Description of the Related Art In recent years, with the remarkable development of telecommunication technology, wireless and wired new media have appeared one after another. A high-definition television with high image quality and an aspect ratio of 16: 9 and a wide-screen television with an aspect ratio of 16: 9 are also popular. In addition, a second-generation high-definition television (second-generation EDTV: hereinafter referred to simply as "EDTV-") that realizes widening and high image quality while maintaining compatibility with the current receiver.
II ”)) has also started broadcasting. In addition, EDTV
-For II, BTA (Broadcasting Technology-Assoc
iation: Broadcasting Technology Development Council), "Detailed Report of 2nd Generation EDTV System" issued on December 9, 1994. Although the present invention is suitable for general application to video signal processing devices, an EDTV-II receiver that has reached a practical stage will be described as an example of the video signal processing device.

First, an outline of the EDTV-II broadcasting system will be described with reference to FIG. FIG. 4 is a diagram for explaining the compatibility between EDTV-II broadcasting and current broadcasting. (A) shows EDTV-
Display example when receiving with a receiver with a built-in II decoder,
(B) is an explanatory view showing a display example on the current receiver.

In FIG. 4A, the aspect ratio 16:
The EDTV-II broadcast signal transmitted by the EDTV-II
When received by a receiver, the aspect ratio 16:
9 images are displayed.

In FIG. 4B, the aspect ratio is 4: 3.
EDTV-II with 16: 9 aspect ratio in current receiver
When receiving the broadcast signal of, a horizontally long image with an aspect ratio of 16: 9 corresponding to 180 scanning lines (lines) per field is displayed in the main image area E at the center of the screen, and 30 lines per field are provided in the upper and lower parts. The non-image area F for displaying the black display level is set. Further, when only the main image area E is transmitted by the letter box method, comparing the screen sizes in which the screen heights match, the image received by the EDTV-II receiver has a horizontal resolution of 3/4 that of the current receiver. Therefore, the horizontal resolution enhancement signal is required. Therefore, in particular, the horizontal band of the luminance signal of the still image is changed from 4.2 MHz to about 6
Horizontal high frequency component HH (Horizo) of luminance signal expanded to MHz
ntal High: Hereinafter, simply described as “HH”). This horizontal high frequency component HH is subjected to carrier suppression amplitude modulation, and is approximately 2 to 2.
The frequency-shifted horizontal resolution reinforcement signal HH '(hereinafter simply referred to as "HH'"), which is obtained by frequency-shifting to a low frequency band of 4 MHz, is frequency-multiplexed and transmitted together with the main image section E.

Similarly, a vertical high frequency component VH (Verti) of a luminance signal for improving the vertical resolution of a still image in the vertical direction which is lost when converting to a letterbox system as a vertical reinforcement signal.
calHigh) is multiplexed in the non-image part F only when a still image. Further, a vertical temporal resolution enhancement signal VT (Vertical Temporal) for improving the vertical resolution of a moving image in the vertical direction generated at the time of progressive scanning-interlaced scanning conversion is always multiplexed in the non-image portion F. Further, on the top 22 lines and 285 lines of the screen of each field, an identification signal for identifying the EDTV-II broadcast, various control information necessary for decoding (phase reference of the reinforcement signal), etc. are provided. G is multiplexed.

For the color signal C, the band is not particularly expanded, and as a recommended technique, the technique of three-dimensional precombing (preliminary removal of interfering components by a comb filter) is adopted on the transmitting side in order to improve the Y / C separation performance. Is defined as desirable.

Next, the outline of the EDTV-II identification control signal will be described with reference to FIG. FIG. 5 is a schematic diagram of the EDTV-II identification control signal, (a) is a waveform diagram showing the identification control signal, and (b) is a diagram showing bit positions and identification contents.

In FIG. 5 (a), the identification control signal G used for automation of various controls on the receiver side is control information contained in the 22/285 line of each field,
Horizontal sync signal Hsync (hereinafter simply referred to as "Hsync")
1, a color burst signal 2 having a reference waveform of 9 cycles in π (radian) phase, an NRZ (Non-Return Zero) signal 3 to which 1/0 is assigned with identification commands B1 to B5, also "1" or " If the information "0" is modulated and the phase is the same as the color burst signal 2 (π phase), the identification commands B6 to B23 are defined as "0" and "1" if the phase is opposite (0 phase). Color subcarrier to be inserted (fsc)
An identification signal (hereinafter, simply referred to as “color subcarrier (fsc)”) having a frequency of 4 and B25 to B27 of 2.0.
The confirmation signal (hereinafter, simply referred to as “confirmation signal”) 5 having a frequency of 4 MHz is generally configured.

The identification command is a 27-bit allocation number having a confirmation function for distinguishing 1 bit = color subcarrier (fsc) from 7 cycles and distinguishing it from an existing video signal. In order to eliminate the influence of noise, only some bits (B1 to B5) have NRZ waveform,
Most of the rest is a modulated wave of the color subcarrier (fsc) 4. In particular, the identification commands B1 and B2 assigned inside the NRZ signal 3 are fixed to "1" and "0" as reference signals of the identification control signal G, respectively. The letterbox (screen mode information) related to the present invention is B3.
Part.

The confirmation signal 5 is a carrier frequency (4/7).
2.04 MHz period modulated by fsc, that is, one period 7
Configured as a sample (clock). That is, (4
/ 7) The phase of the subcarrier of fsc is extracted and used as the synchronization timing for decoding the reinforcement signal.

FIG. 1B is a diagram showing bit positions and identification contents as mode identification information, which is made up of identification contents such as bit numbers and reference signals, and a status storing 1/0 control information. There is. If a part of it is explained as the essential mode identification information, the letterbox B3 according to the present invention is the top priority necessary information for specifying the display format of the screen in the 16: 9 receiver, and is the normal information. The status is "0" at (4: 3) and the status is "1" at letterbox (16: 9). B8
The presence or absence of various reinforcement signals of B to B10 is necessary information for the purpose of preventing S / N deterioration in the absence of reinforcement signals. The information of presence / absence of HH precombing in B11 is such that when the HH 'signal is multiplexed on the transmitting side without precombing, the receiver side stops the demodulation of the HH' signal and the color signals C and HH. This is important information because it is used to prevent crosstalk. It should be noted that there are many uncertain factors in the diagram showing each bit position and the identification content, and may be adjusted in future.

A specific configuration of the identification signal processing device of the EDTV-II receiver according to the present invention will be described with reference to FIG. FIG. 6 is a block diagram showing an example of a conventional identification signal processing device for an EDTV-II receiver.

The main components of the identification signal processing device in FIG. 6 are the input unit 6 to which the video signal on which the EDTV-II identification control signal is superimposed and the EDTV-II for detecting the presence of the EDTV-II identification control signal. Signal detector 7, EDTV-II
B3 detector 8 for detecting bit information B3 of letterbox signal of identification control signal, EDTV-II signal detector 7 and B
(3) A letterbox judging device 9 for judging whether or not the signal is a letterbox signal from the output result of the detector 8 and an output section 10 for outputting the judgment result.

The operation of the conventional identification signal processing device of the EDTV-II receiver will be described.

The EDTV-II signal input to the input section 6 is input to the EDTV-II signal detector 7 and the B3 detector 8 in parallel. In the EDTV-II signal detector 7, for example, 2
It is checked whether the confirmation signal 5 of the EDTV-II identification control signal superimposed on the 2/285 line and the reference bits B1 and B2 superimposed in the NRZ format are “1” and “0”, respectively, and the existence of these is checked. By EDTV
-II Judge that the identification control signal is present and output the result. The B3 detector 8 detects bit information B3 representing the letterbox signal of the EDTV-II identification control signal superimposed on the 22/285 line, and outputs the result.

In the letterbox decision circuit 9, the EDTV
Receiving the results of the II signal detector 7 and the B3 detector 8,
If the EDTV-II identification control signal is present and the bit information B3 of the letterbox signal is indicated by the status "1", it is determined to be the letterbox signal,
The result is output to the output unit 10. For example, EDTV-II
In the case of a television receiver or the like, processing such as switching the screen mode is performed according to this information.

[0018]

However, in the identification signal processing device of the conventional EDTV-II receiver, the ED
If the TV-II identification control signal is not fully decoded, only the NRZ signal of the EDTV-II identification control signal is decoded, and the error check code CR
C (Cyclic Redundancy Check) code and color subcarrier (fs
c) The signal check of the modulation part is not performed. Therefore, there is a problem in that the discrimination as to whether or not the discrimination control signal is present becomes sluggish, the discrimination control signal for reproducing the EDTV-II signal cannot be normally decoded, and the display image is also affected. It was

The present invention has been made in view of the above problems, and its object is to stably detect a letterbox signal even when full decoding of an EDTV-II identification control signal is not performed, for example. (EN) Provided is an identification signal processing device.

[0020]

In order to solve such a problem, in an identification signal processing device of the present invention, an identification signal processing device for receiving and processing a second generation high definition television signal having an identification control signal, Identification control signal detection means for detecting the identification control signal, and bit information detection means for detecting bit information of the letterbox signal of the identification control signal,
Identification control signal detecting means for detecting the identification control signal;
The above-mentioned problem is provided with a black display level detecting means for detecting a black display level from a non-image part of a next generation high definition television signal, and a letter box judging means for judging a letter box signal from these detection results and outputting the result. Solved.

Similarly, in the identification signal processing device of the present invention, in the identification signal processing device for receiving and processing the second generation high definition television signal having the identification control signal, the identification control signal detecting means for detecting the identification control signal. And bit information detecting means for detecting bit information of the letterbox signal of the identification control signal, and the non-picture portion of the second-generation high-definition television signal to the non-picture portion of the second-generation high-definition television signal. A black discrimination range for detecting the presence or absence of a reinforcement signal such as the vertical time resolution reinforcement signal VT (B8) and the vertical high frequency component VH (B9) of the luminance signal, and adjusting the discrimination range of the black display level according to the presence or absence of the reinforcement signal. A setting means and a letterbox discrimination means for discriminating a letterbox signal from these results and outputting the result were provided.

According to the identification signal processing device of the present invention having such a configuration, in addition to the identification control signal detection means and the bit information detection means, the black display level detection means for detecting the black display level from the non-image portion is provided. Then, the black display level detecting means determines whether the signal level of the non-image portion is the black display level, and then detects the letterbox. Therefore, it is possible to reliably and stably detect the letterbox signal, and also to detect the EDTV.
-The identification control signal for reproducing the II signal can be reliably decoded.

Since it is possible to arbitrarily set the black display level determination range in response to the case where a reinforcement signal or the like is superimposed on the upper and lower non-picture areas such as an EDTV-II signal, for example.
Even when there is a reinforcement signal in the upper and lower non-image areas, it becomes possible to set the discrimination range of the black display level in consideration of the fact that the reinforcement signal is superimposed on the discrimination range of the black display level.
It is possible to accurately detect the black display level of the non-image part and to reliably and stably detect the letterbox signal.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of an identification signal processing apparatus for an EDTV-II receiver according to the present invention will be described below with reference to FIGS. The same parts as those in the figure showing the identification signal processing device of the conventional EDTV-II receiver are designated by the same reference numerals.

First, referring to FIG. 1, the EDTV-of the present invention.
The configuration of the II receiver will be described. FIG. 1 shows the EDTV of the present invention.
It is a block diagram which shows an example of an II receiver.

The configuration of the EDTV-II receiver of the present invention includes an antenna 11 for receiving a broadcast signal, a tuner 12 for demodulating the broadcast signal, and a video intermediate frequency circuit VIF (Video Intermediate Frequency) for performing amplification and video detection as shown in the figure. 1
3. A to digital conversion of received broadcast signal A
/ D converter 14, three-dimensional Y / C separator 15 to which the digitally converted composite video signal is input in parallel, motion detector 16, identification control signal according to the present invention for demodulating and processing the identification control signal A processor 17, a timing generator 18 for generating and outputting various timing signals, a C / HH 'separator 19 for separating the C + HH' signal separated from the three-dimensional Y / C separator 15, and a separated HH '. An HH demodulator 20 for demodulation, a color demodulator 21 for demodulating the color signal C output from the C / HH 'separator 19 and outputting color difference signals RY and BY, the three-dimensional Y / C separator An adder 22 for adding the YL output from 15 and the HH signal output from the HH demodulator 20, and a matrix 23 for converting these into R, G, B signals for driving a cathode ray tube (CRT) as a display means. Or It is configured. The identification signal processing device section according to the present invention is the identification control signal processor 17 and the timing generator 18.

The operation of the EDTV-II receiver of the present invention having such a configuration will be described.

In FIG. 1, an antenna 11 receives a broadcast signal, generates an RF signal, and outputs the RF signal to a tuner 12 in the next stage. In the tuner 12, band amplification,
An operation of converting to a video intermediate frequency signal and an operation of selecting a desired broadcast signal by a music selecting means (not shown) are performed.
The VIF 13 removes, amplifies, and video-detects the interfering waves of the broadcast signal converted into the VIF signal by the tuner 12, extracts the composite video signal, and outputs the composite video signal to the A / D converter 14. The A / D converter 14 converts the composite video signal into a digital composite video signal suitable for the following processing.

In the three-dimensional Y / C separator 15, for example, a digitized composite video signal is stored in a memory, and addition / subtraction is performed between adjacent scanning lines in a moving image and between fields in a still image to perform movement. The luminance signal YL is obtained by combining these based on the result of the detector 16.
And the color signal C + HH 'are separated. The luminance signal YL
Is input to the adder 22 in the next stage. The identification control signal processor 17, which is a signal processing circuit unit according to the present invention, is an EDTV.
-Decodes and outputs the identification signal for identifying the II broadcast and various control information necessary for decoding. The timing generator 18 digitally generates and outputs various timing pulses necessary for the EDTV-II receiver of the present invention.

On the other hand, the C + HH 'signal separated by the three-dimensional Y / C separator 15 is the C / HH' separator 19 in the next stage.
Is input to In the C / HH 'separator 19, the color signal C
And the frequency-shifted horizontal resolution enhancement signal HH ', and the color signal C is color difference signal R- in the color demodulator 21.
It is output to the matrix 23 after demodulation into Y and BY. H
The H'signal is sent to the HH demodulator 20, decoded by synchronous detection, etc., and input to the adder 22 as the horizontal high frequency component HH of the original luminance signal. The adder 22 adds the YL signal and the HH signal to output to the matrix 23 as a broadband luminance signal Y in the EDTV-II system.
In the matrix 23, after being converted into R, G and B signals suitable for the CRT in the next stage, the signals are output to the CRT for information display.

Embodiment 1 Continuing on, a concrete example of an identification signal processing apparatus for an EDTV-II receiver according to the present invention will be described with reference to FIG. FIG. 2 is a block diagram showing a first embodiment of an identification signal processing device for an EDTV-II receiver according to the present invention.

The configuration of the identification signal processing device of the EDTV-II receiver according to the present invention detects the presence of the input section 6 to which the video signal on which the EDTV-II identification control signal is superimposed and the EDTV-II identification control signal are detected. EDTV-II signal detector 7,
B3 detector 8 for detecting bit information B3 of letterbox signal of EDTV-II identification control signal, upper and lower non-image portion signal for detecting letterbox from black display level of upper and lower non-image portion of EDTV-II signal Detector 30, ED
A letterbox judging device 9 for judging whether the signal is a letterbox signal from the output results of the TV-II signal detector 7, the B3 detector 8 and the upper and lower non-image area signal detector 30, and an output unit for outputting the judgment result. It is roughly composed of 10.

The operation of the identification signal processing device of the EDTV-II receiver of the present invention will be described.

The EDTV-II signal input to the input unit 6 is input in parallel to the EDTV-II signal detector 7, the B3 detector 8 and the upper and lower non-image area signal detector 30. EDTV-
In the II signal detector 7, for example, confirmation of the confirmation signal 5 of the EDTV-II identification control signal superimposed on the 22/285 line,
Reference bits B1 and B2 superimposed in the NRZ format
Are respectively "1" and "0", the presence of the EDTV-II identification control signal is judged from these results, and the result is output. B3 detector 8 has EDTV-II superimposed on 22/285 line
Bit information B representing the letterbox signal of the identification control signal
3 is detected and the result is output.

In the upper and lower non-image area signal detector 30, since the signal level of the upper and lower non-image areas is a black display level if it is a letterbox signal, the signal levels of the upper and lower non-image areas are confirmed and the black display level is confirmed. The result of whether or not it is output. EDT
The detection results of the V-II signal detector 7, the B3 detector 8, and the upper and lower non-image area signal detector 30 are output to the letterbox determiner 9 in the next stage. The letterbox decision device 9 receives these results, the EDTV-II identification control signal is present, the bit information B3 of the letterbox signal is detected, and the detection result of the upper and lower non-image area signal detector 30 is the black display level. Is determined to be a letterbox signal.

As described above, in the identification signal processing device for the EDTV-II receiver of the present invention, it is confirmed that the upper and lower non-image areas are at the black display level when the EDTV-II signal indicates the letterbox information. Since it is determined that the information is letterbox information, it is possible to reliably and stably detect a letterbox signal.

Embodiment 2 When the status of the bit information B3 of the letterbox signal is "1", EDTV-
The reinforcement signal of the II identification control signal may be superimposed, and the presence of the reinforcement signal may cause the identification signal processing device to malfunction. Therefore, in this embodiment, the upper and lower non-image area signal detection can be performed more stably by adjusting the allowable range for determining the black display level in consideration of the reinforcement signal being superimposed. This is a form example, which will be described with reference to FIG. FIG. 3 shows the EDTV of the present invention.
It is a figure which shows Embodiment 2 of the identification signal processing apparatus of a II receiver, (a) is a block diagram which shows the example, (b) is a block diagram which shows the detail of an up-and-down non-picture part signal detector. .

The configuration of the present embodiment detects the presence of the input section 6 and the EDTV-II identification control signal to which the video signal on which the EDTV-II identification control signal is superimposed is input as shown in FIG. 3 (a). EDTV-II signal detector 7, EDTV-
II Bit information B3 of letterbox signal of identification control signal
B3 detector 8 for detecting
And the non-image-free area signal detector 40, which is a characteristic part of the present embodiment, a letterbox judging device 9 for judging whether or not it is a letterbox signal from these results, and an output unit 10 for outputting the judgment result. Composed of.

The detailed configuration of the upper and lower non-image area signal detector 40 of FIG. 2B is, for example, 2 depending on the detection result A of the B3 detector.
A switch element 41 for switching between two black display levels, a level comparator 42 for comparing the black display level selected by the switch element 41 with the input Video signal, and a non-image portion timing signal F'indicating a non-image portion period. (See FIG. 4 (b) described above) In response to the non-picture portion timing generator 44 and non-picture portion timing signal F ', it is determined whether the signal is letterbox from the comparison result during the non-picture portion. The signal determining unit 43 for performing the above, and the output unit 10 for outputting the determination result.

The operation of the identification signal processing device of the EDTV-II receiver of the present invention will be described with reference to FIGS. 3 (b) and 4 (b).

The switch element 41 switches the black level 1 and the black level 2 according to the detection result A of the B3 detector. For example, if the detection result A of the B3 detector is letterbox, a reinforcement signal may be superimposed on the upper and lower non-image parts, and therefore the black display level determined to be no image is set to the upper and lower non-image parts. The black level 1 is set to be large because the parts are overlapped. If it is not the letterbox, the pedestal level is switched to the black level 2 which is a level added in consideration of noise and the like. That is, the black level 2 is a level close to the pedestal level, and the black level 1 is a level obtained by adding the level in which the reinforcement signal is superimposed on the black level 2.

In the level comparator 42, the switch element 41
The black display level selected in 1 is compared with the level of the input Video signal, and whether or not the input Video signal is lower than the selected black display level is output as a result. Further, the non-image part timing generator 44 is shown in FIG.
A non-picture area timing signal F ′ indicating the non-picture area period F shown in FIG. In the signal judging unit 43, the non-picture portion timing signal F ′ input from the non-picture portion timing generator 44
Check the comparison result by the level comparator 42 during the non-image portion period indicated by, and output to the output unit 10 a determination as to whether it is a letterbox. The check method is, for example, "letterbox if there are more areas smaller than the black level".

In the identification signal processing device of the EDTV-II receiver of the present invention, the black display level can be changed and checked to make more stable non-image area determination, and the reliability of the non-image area determination result. You can improve your sex. In addition, EDT
Bit information B8 (VT), B9 (V) indicating whether the reinforcement signals VT and VH of the V-II identification control signal are superimposed.
H) etc. are detected, B3 in FIG.
It is also possible to make finer adjustments by using this information instead of (letterbox signal) detection.

The present invention is not limited to the above embodiment,
Various embodiments can be adopted. For example, in this embodiment, an EDTV-II is used as an example of an identification signal processing device.
Although the receiver has been described, it is needless to say that the invention can be applied to other AV devices such as video devices, recordable disk devices, recording medium integrated monitor devices, projector devices, and the like. That is, by decoding the identification signal processing device of the present invention as an integrated circuit IC in these AV devices or by programmatically incorporating it in another ASIC for a specific purpose, the identification control signals of these AV devices can be decoded. It can be done reliably.

The identification signal processing device of the present invention is an EDT.
It is not limited to V-II identification control signal processing, but as another standard for VTRs, the Japan Electro-Mechanical Industry Association interim standard “Identification signal and transmission method of video signal with different aspect ratio (II) (525 line system)”, EIAJCPX- The same configuration can be applied to a processing circuit of a video ID identification signal established as 1204 and the like.

[0046]

As described above, according to the identification signal processing apparatus of the present invention, the identification control signal detecting means for detecting the presence of the EDTV-II identification control signal, the bit of the letterbox signal of the EDTV-II identification control signal. In addition to the bit information detecting means for detecting the information B3, the black display level detecting means for detecting the black display level from the non-image portion is provided. Then, the black display level detecting means determines whether the signal level of the non-image portion is the black display level, and then detects the letterbox. As a result, it is possible to reliably and stably detect the letterbox signal, and it is possible to reliably decode the identification control signal that reproduces the EDTV-II signal.

Further, in order to prevent the identification signal processing device from malfunctioning due to the presence of the reinforcement signal in response to the case where the reinforcement signal or the like is superimposed on the non-picture part such as an EDTV-II signal, for example, a black color is used. The determination range of the display level can be set in consideration of the fact that the reinforcement signal is superimposed. This enables stable detection of the black display level of the non-image area even when the reinforcement signal is present in the non-image area, and is stable even when the reinforcement signal is superimposed on the non-image area. It becomes possible to detect a letterbox signal.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of an EDTV-II receiver of the present invention.

FIG. 2 is a block diagram showing a first embodiment of an identification signal processing device for an EDTV-II receiver according to the present invention.

3A and 3B are diagrams showing Embodiment 2 of an identification signal processing device for an EDTV-II receiver according to the present invention, in which FIG. 3A is a block diagram showing an example thereof, and FIG. It is a block diagram which shows the detail of a container.

FIG. 4 is a diagram for explaining compatibility between EDTV-II broadcasting and current broadcasting, and FIG. 4A is an explanatory diagram showing a display example when received by a receiver incorporating an EDTV-II decoder;
(B) is an explanatory view showing a display example on the current receiver.

FIG. 5 is a schematic diagram of an EDTV-II identification control signal,
(A) is a waveform diagram showing an identification control signal, and (b) is a diagram showing bit positions and identification contents.

FIG. 6 is a block diagram showing an example of a conventional identification signal processing device for an EDTV-II receiver.

[Explanation of symbols]

 1 Horizontal sync signal Hsync 2 Color burst signal 3 NRZ signal 4 Identification signal having frequency of color subcarrier (fsc) 5 Confirmation signal having frequency of 2.04 MHz 6 Input section 7 EDTV-II signal detector 8 B3 detector 9 Letterbox decision device 10 Output part 11 Antenna 12 Tuner 13 VIF 14 A / D converter 15 Three-dimensional Y / C separator 16 Motion detector 17 Discrimination control signal processor 18 Timing generator 19 C / HH 'separator 20 HH demodulation Device 21 Color demodulator 22 Adder 23 Matrix 30, 40 Upper and lower non-picture area signal detector 41 Switch element 42 Level comparator 43 Signal judger 44 Non-picture area timing generator G Discrimination control signal HH High frequency luminance signal HH 'frequency Horizontal resolution enhancement signal after shifting VH Vertical high frequency component of luminance signal VT Vertical time resolution compensation Signal

Claims (3)

[Claims] 1. An identification signal processing device for receiving and processing a second generation high definition television signal having an identification control signal, comprising: bit information detecting means for detecting bit information of a letterbox signal of the identification control signal; Identification control signal detection means for detecting the identification control signal, black display level detection means for detecting a black display level from a non-image portion of the second-generation high-definition television signal, the identification control signal detection means, and the bit An identification signal processing device, comprising: an information detecting unit and a letterbox discriminating unit that discriminates the letterbox signal from the detection results of the black display level detecting unit and outputs the result. 2. An identification signal processing device for receiving and processing a second generation high quality television signal having an identification control signal, the identification control signal detecting means for detecting the identification control signal, and the letter of the identification control signal. A bit information detecting means for detecting bit information of the box signal, and detecting the presence or absence of a predetermined reinforcement signal from the non-image part of the second-generation high-definition television signal, and displaying black according to the presence or absence of the predetermined reinforcement signal. A black discriminating range setting means for adjusting the discriminating range of levels, a letter for discriminating the letterbox signal from the results of the discrimination control signal detecting means, the bit information detecting means, and the black discriminating range setting means, and outputting the result. An identification signal processing device, comprising: box discrimination means. 3. The predetermined reinforcement signal is a vertical high frequency component of a luminance signal and a vertical time resolution reinforcement signal to be superimposed on a non-picture part of the second-generation high definition television signal. Item 2. The identification signal processing device according to item 2.