JPH09205594A - Device and method for discriminating identification control signal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decode accurately a discrimination command by solving problems of malfunction due to adjacent bits in parity check and unable provision against an error in 2-bit or over in the CRC check or the like. SOLUTION: This device is constituted by adding a discrimination command characteristic check circuit 100 used to verify characteristics such that 'an identification command B3 is logical 1 without fail when one or over of discrimination commands B8 to B10 are logical 1' or 'an identification command B10 is logical 1 without fail when an identification command B11 is logical 1' or the like is added to a circuit block consisting of an input section 12 receiving identification commands, a parity check circuit 13 checking parity of identification commands B3 to B5 by an identification command B4, and a cyclic redundancy check(CRC) circuit 14 checking the CRC based on the identification commands B3 to B23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discriminating apparatus and a discriminating method for discriminating control signals of, for example, a second-generation high-definition television, and more specifically, discriminating control by checking the unique characteristics of the discriminating control signals. The present invention relates to a discrimination device and a discrimination method for discriminating control signals for preventing erroneous detection of signals.

[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 (HDTV) with a high image quality and an aspect ratio of 16: 9, or a second-generation high-definition television (2nd generation) that realizes widening and high image quality while maintaining compatibility with current televisions. EDTV: Below, simply "E
"DTV-II") has also started broadcasting. The present invention is suitable for general application to video processing apparatuses, but as an example of video processing apparatus, EDTV-II that has reached a practical stage.
The receiver will be explained.

The EDTV-II maintains a compatibility with the current television broadcasting, and has a frequency bandwidth of 6 M per channel.
In order to widen the screen and improve the image quality in Hz, the letter box format is adopted as the transmission format of the wide image. BT for EDTV-II
A (Broadcasting Technology Association), published on December 9, 1994, "Second Generation ED
The details are described in "TV System Study Report".

An outline of the identification control signal of the EDTV-II according to the present invention will be described with reference to FIG. Figure 3 shows EDTV-
It is a figure which shows the outline | summary of the identification control signal of II, (a) is a figure which shows an identification control signal waveform, (b) is a figure which shows a bit position and identification content.

The identification control signal used for automation of various controls on the receiver side in FIG. 3 (a) is the control information contained in the 22/285 line of each field, and is a horizontal synchronizing signal Hsync (hereinafter referred to as "hsync"). , Simply referred to as "Hsync")
1, a color burst 2 consisting of a reference waveform of 9 cycles in π (radian) phase, NRZ (Non-Return Zero) 3 meaning 1/0 to which identification commands B1 to B5 are assigned, also "1" or "0" If the information is modulated and the phase is opposite (0 phase) to the color burst 2, “1”, in phase (π phase)
In this case, the identification command B6 to B23 defined by "0" is inserted into the color subcarrier (fsc) 4, and the confirmation signal 5 is composed of B25 to B27. The identification commands of B1 to B23 are allocation numbers having a confirmation function for distinguishing from the existing video signal composed of 1 bit = 28 samples, and B1 is used to eliminate the influence of noise such as ghost.
Only B5 to B5 are NRZ waveforms, and most of the rest are color subcarrier (fsc) modulated waves.

The confirmation signal 5 has a carrier frequency (4 / 7f).
sc) modulated 2.04MHz period, ie 1 period 7
Configured as a sample clock. That is, (4 /
The phase of the subcarrier of 7 fsc) is extracted and used as the synchronization timing for decoding the reinforcement signal.
Further, the identification commands B1 and B2 assigned to the NRZ3 are fixed to "1" and "0", respectively, as references of the identification control signal.

FIG. 1B is a diagram showing the bit positions and identification contents as the mode identification information, which is made up of the bit number, the contents of the reference signal and the like, and the status storing the control information of 1/0. To explain the identification information according to the present invention, the letterbox B3 is the top priority information necessary for specifying the display format of the screen in the 16: 9 receiver, and the status "in normal (4: 3)". It is indicated by status "1" when it is 0 "and letterbox (16: 9). The presence / absence of various reinforcement signals of B8 to B10 is necessary information for the purpose of preventing S / N deterioration when there is no reinforcement signal. That is, the vertical temporal resolution enhancement signal VT of B8, the vertical high frequency component VH of the luminance signal of B9 and the horizontal high frequency component HH (H of the luminance signal of B10.
horizontal High: hereinafter, simply referred to as "HH") is not multiplexed when the aspect ratio (4: 3) and is set to status "0".

Information on the presence / absence of HH precombing of B11 is used when the horizontal resolution enhancement signal HH '(hereinafter simply referred to as "HH'") after frequency shift is multiplexed on the transmitting side without precombing, when the receiver On the side, this information gives H
This is important information because it is used for the purpose of stopping the demodulation of H ′ and preventing the crosstalk between the color signals C and HH. The parity of B4 is a parity bit of B3 to B5, and an error check is performed by taking an even parity of B3 to B5. Further, 6 bits of B18 to B23 are an error check code CRC (Cyclic Redundancy Check) code for B3 to B17, and an error of 1 bit among 21 bits of B3 to B23 can be corrected. 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.

Next, with reference to FIG. 4, a discrimination device and a discrimination method of the discrimination control signal of the EDTV-II receiver will be described.
FIG. 4 is a block circuit diagram showing a discrimination control signal discriminating apparatus according to the present invention.

The main configuration of the discrimination control signal discriminating apparatus in FIG. 4 is such that the input section 6 to which the video signal on which the EDTV-II discrimination control signal is superimposed is input, and the E input to the input section 6.
A bit decoding circuit 7 that decodes an identification command from a DTV-II identification control signal, an EDTV-II signal detector 8 that also detects the presence of an EDTV-II identification control signal, and an identification command detected by the bit decoding circuit 7 is correctly detected. Discriminating circuit 9 for discriminating whether or not the EDTV
-II signal detector 8 and an output control circuit 10 that determines whether or not to output based on the determination result of the determination circuit 9, and an output unit 11 that outputs the determined result.

The operation of the discrimination device of the discrimination control signal of the EDTV-II receiver will be described.

The EDTV-II signal input to the input section 6 is a bit decoding circuit 7 and an EDTV-II signal detector 8.
Are input in parallel. 22 in the bit decoding circuit 7
The identification command is detected from the EDTV-II identification control signal superimposed on the / 285 line, and the information of each identification command is output. 22/285 in EDTV-II signal detector 8
Confirm that the signal superimposed on the line is the EDTV-II identification control signal. The confirmation method is, for example, in FIG.
It is confirmed that the confirmation signal 5 shown in (a) is present, that the reference bit B1 in FIG. 2 (b) is "1" and B2 is "0", and the result is sent to the output control circuit 10. Output.

The discriminating circuit 9 discriminates whether or not each identification command detected by the bit decoding circuit 7 is correctly detected and outputs it, which will be described in detail later. The output control circuit 10 controls the output of each identification command detected by the bit decoding circuit 7 based on the detection result of the EDTV-II signal detector 8 and the determination result of the determination circuit 9, and, for example, an EDTV-II signal is erroneous. If there is no detection, the detected result is output as it is, and if it is determined that it is not the EDTV-II signal, the result is not output, and the output unit 11 outputs the result.
Output to With EDTV-II television receivers,
Processing such as switching the screen mode is performed based on the identification command thus detected.

A specific configuration of the above-mentioned discrimination circuit will be described with reference to FIG. FIG. 5 is a block circuit diagram showing a conventional discrimination control signal discriminating apparatus.

The conventional identification control signal discriminating apparatus has an input section 12 to which various identification commands decoded by the bit decoding circuit 7 are input, and a parity for performing a parity check of B3 to B5 by the input identification command B4. Check circuit 13, CRC check circuit 14 that performs CRC check using CRC codes of B18 to B23, and error detection determination circuit 15 that determines whether or not error detection is performed based on the results of parity check circuit 13 and CRC check circuit 14. Output unit 1 that outputs the determination result
6.

The operation of the conventional discrimination control signal discriminating apparatus having such a configuration will be described.

The identification command decoded by the bit decoding circuit 7 in FIG. 4 is input to the parity check circuit 13 and the CRC check circuit 14. The parity check circuit 13 performs a parity check using the identification commands B3 to B5. That is, as described above, B4 is a parity bit, and B4 causes B3
To B5 even parity determination is performed, and the result is output to the erroneous detection determination circuit 15. The CRC check circuit 14 performs a CRC check by using the fact that B18 to B23 are error correction codes for B3 to B17, and outputs the result to the erroneous detection determination circuit 15. The erroneous detection determination circuit 15 determines from these results whether erroneous detection has occurred and outputs the result to the output unit 16.

By the way, since the parity check in the parity check circuit 13 makes a judgment in a continuous narrow range of B3 to B5, for example, when B3 has an error, B4 may be affected and two bits may be affected. If the error occurs, the result of the parity check is judged to be correct. Further, the CRC check in the CRC check circuit 14 can perform an error check in a wide range of B3 to B17, but cannot be detected when an error of 2 bits or more occurs. As described above, the conventional erroneous detection judgment cannot fulfill the sufficient check function, and there is a problem that the reliability of the discrimination of the discrimination control signal by the discrimination device is lost. This has a problem that not only the reinforcement signal that responds to the output result of the identification command cannot be accurately decoded, but also the screen mode cannot be switched and the displayed image is affected.

[0019]

SUMMARY OF THE INVENTION The present invention has been made in view of such problems, and the problem is, for example, ED.
When decoding the identification command of TV-II, it is possible to correctly decode the identification command by solving problems such as malfunctions when an adjacent bit error occurs in the parity check and errors of 2 bits or more in the CRC check. Another object of the present invention is to provide a discriminating apparatus and a discriminating method for the discrimination control signal.

[0020]

In order to solve the above-mentioned problems, a method for discriminating an identification control signal according to claim 1 is an identification for receiving and processing a second-generation high-definition television signal having an identification control signal. A method of determining a control signal, comprising a parity check step of performing a parity check of identification command bits B3 to B5 by an identification command bit B4, and an error detection of identification command bits B3 to B17 by an error detection code of the identification command bits B18 to B23. An error detection step for performing the following steps, an identification command characteristic inspection step for verifying the characteristics of the identification command and condition checking of the identification command, and an erroneous detection determination step for determining erroneous detection of the identification command from the inspection results of these steps. Included.

An identification control signal discriminating apparatus according to claim 5 is an identification control signal discriminating apparatus which receives and processes a second-generation high-definition high-definition television signal having an identification control signal. A parity check means for performing a parity check of the identification commands B3 to B5 by B4, a CRC error detection means for performing an error detection of the identification commands B3 to B17 by the CRC error detection code of the identification commands B18 to B23, and the characteristics of the identification command are verified. Then, it is provided with an identification command characteristic inspection means for checking whether or not the conditions of the identification command are satisfied, and an erroneous detection determination means for determining erroneous detection of the identification command from these inspection results.

The characteristic of the identification command is that "the identification command bit B3 is always" 1 "when any one or more of the identification command bits B8 to B10 is" 1 "".
Alternatively, "when the identification command bit B11 is" 1 ", the identification command bit B10 is always" 1 "" or the like.

In the discriminating apparatus and the discriminating method of the discrimination control signal of the present invention, the discrimination command "discrimination command B8" is newly added.
Or if any one or more of B10 are "1", the identification command B3 is always "1" and "when the identification command B11 is" 1 ", the identification command B10 is always" 1 "", etc. The identification command characteristic inspecting means for verifying the characteristics of and verifying whether the conditions of the identification command are satisfied or not is added. As a result, the erroneous detection discrimination function of the identification command is reinforced, so that the erroneous detection of the identification command can be prevented and the stable identification command can be detected.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a discriminating apparatus and a discriminating method for a discriminating control signal of 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 discrimination control signal discriminating apparatus 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.
FIG. 3 is a block circuit diagram showing an example of an II receiver.

The configuration of the EDTV-II receiver of the present invention comprises an antenna 21 for receiving a broadcast signal, a tuner 22 for demodulating the broadcast signal, and a video intermediate frequency circuit V for performing amplification / video detection.
IF (Video Intermediate Frequency) 23, A / D converter 2 that performs analog-to-digital conversion of the received broadcast signal
4. A three-dimensional Y / C separator 25 to which the digitally converted composite video signal is input in parallel, a motion detector 26, a discrimination control signal processor 27 and a timing generator 28 according to the present invention, and a three-dimensional Y C / HH 'separator 29 for separating the separated C + HH' from the / C separator 25, an HH demodulator 30 for demodulating the separated HH ', and a color signal C output from the C / HH' separator 29. The color difference signal R-
A color demodulator 31, which outputs Y, BY, an adder 32, which adds YL output from the three-dimensional Y / C separator 15 and HH output from the HH demodulator 30, and R, G,
It is composed of a matrix 33 for converting into a B signal, a CRT (cathode ray tube) 34 as a display means, and the like.

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

The antenna 21 receives the broadcast signal and outputs the RF signal.
A signal is generated and the RF signal is output to the tuner 22 in the next stage. The tuner 22 performs an operation of band amplification and conversion into a video intermediate frequency signal, and an operation of selecting a desired broadcast signal by a music selecting means (not shown). The VIF 23 removes, amplifies, and video-detects an interfering wave of the broadcast signal converted into the VIF signal by the tuner 22, extracts a composite video signal, and outputs the composite video signal to the A / D converter 24. A / D
The converter 24 converts the composite video signal into a digital composite video signal suitable for the following processing.

In the three-dimensional Y / C separator 25, 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 move. By combining these based on the result of the detector 26, the luminance signal YL
And the color signal C + HH 'are separated. The luminance signal YL is output to the adder 32 at the next stage. The identification control signal processor 27 according to the present invention decodes and outputs an identification signal for identifying EDTV-II broadcasting and various control information necessary for decoding. The timing generator 28 digitally generates and outputs various timing pulses required for the EDTV-II receiver.

On the other hand, C + HH 'separated by the three-dimensional Y / C separator 25 is input to the C / HH' separator 29 in the next stage. The C / HH ′ separator 29 separates the color signals C and HH ′, and the color signal C is demodulated by the color demodulator 31 into color difference signals RY and BY, which are output to the matrix 33. HH 'is sent to the HH demodulator 30, decoded by synchronous detection, etc., and output to the adder 32 as the original HH. The adder 32 adds YL and HH to output to the matrix 33 as a broadband luminance signal Y in the EDTV-II system. CR in the next stage in matrix 33
After being converted into R, G, and B signals suitable for T34, the signals are output to the CRT 34 for information display.

Referring again to FIG. 4, the EDTV of the present invention-
II A discrimination device and a discrimination method of the discrimination control signal of the image receiver will be described.

The main configuration of the discrimination control signal discrimination device in FIG. 4 is to decode the discrimination command from the EDTV-II discrimination control signal and the input section 6 to which the video signal on which the EDTV-II discrimination control signal is superimposed is inputted. A bit decoding circuit 7, an EDTV-II signal detector 8 which also detects the presence of an EDTV-II discrimination control signal, a discrimination circuit 9 which discriminates whether the discrimination command detected by the bit decoding circuit 7 is correctly detected, and an EDTV. -II signal detector 8 and an output control circuit 10 that determines whether to output based on the result of the determination circuit 9, and an output unit 11 that outputs the result. The description of the operation of the identification control signal discriminating apparatus of the present invention will be omitted because it is redundant.

Next, a specific structure of the discrimination control signal discriminating apparatus of the present invention will be described with reference to FIG. FIG. 2 is a block circuit diagram showing an identification control signal discriminating apparatus of the present invention.

The discriminating device (discriminating circuit) for discriminating control signals according to the present invention includes an input section 12 to which various identifying commands decoded by the bit decoding circuit 7 are inputted, and B3 to B5 depending on the inputted identifying command B4. In addition to the parity check circuit 13 that performs the parity check and the CRC check circuit 14 that performs the CRC check from B3 to B23 described above, whether the characteristics of the identification command are verified to satisfy the conditions of the identification command as a feature of the present invention. The identification command characteristic check circuit 100 for checking whether or not there is a false detection detection circuit 15 for determining whether or not a false detection has occurred from these check results, and an output unit 16 for outputting the result of the determination.

The operation of the discrimination control signal discriminating apparatus of the present invention having such a configuration will be described.

The identification command decoded by the bit decoding circuit 7 of FIG.
3, and is input in parallel to the CRC check circuit 14 and the identification command characteristic check circuit 100. The parity check circuit 13 performs an even parity check from the identification commands B3 to B5 and outputs the result. The CRC check circuit 14 uses the input identification commands B3 to B23 to perform a CRC check using the CRC code in B18 to B23.

The identification command characteristic check circuit 100 determines whether or not the command condition is satisfied from the characteristics of the following two identification commands, and outputs the result. That is, (1). When any one or more of the identification commands B8 to B10 is "1", B3 is always "1". (2). When the identification command B11 is "1", B1
0 is always "1". Etc. and the result is the false detection discrimination circuit 1 in the next stage.
5 is output. The erroneous detection determination circuit 15 determines whether the identification command detected from the results of the parity check circuit 13, the CRC check circuit 14, and the identification command characteristic check circuit 100 has been erroneously detected, and outputs the result to the output unit 16.

Thus, according to the discrimination circuit of the present invention,
"When any one or more of the reinforcement signal bits of B8 to B10 is" 1 ", B3 is always" 1 "" and "When the identification command B11 is" 1 ", B10 is always" 1 ". Since the determination is performed by utilizing the characteristics of the identification command such as "," the function of the erroneous detection determination can be reinforced, and the stable detection of the identification command can be performed.

Further, the above-mentioned characteristic that "B3 is always" 1 "when any one or more of the reinforcing signal bits of B8 to B10 is" 1 "" means that the input video signal is a letterbox signal. It can also be used to determine whether or not. That is, in the discrimination control signal discriminating apparatus and discriminating method of the present invention, "when any one or more of the reinforcing signal bits of B8 to B10 is" 1 ", the letterbox signal of B3 is always" 1 "". This is used to detect the letterbox signal. This makes it possible to detect whether the input video signal is letterbox or not, and to reliably decode the EDTV-II signal.

The present invention is not limited to the above embodiment,
Various embodiments can be adopted. For example, in the present embodiment, an EDTV is used as an example of the identification control signal processing device.
Although the -II receiver has been described, it is needless to say that the present invention can be applied to other AV equipment such as video equipment, recordable disc device, recording medium integrated monitor device, and projector device. That is, by installing the identification control signal processing device of the present invention as an integrated circuit IC in these AV devices, or by programmatically incorporating the device in another ASIC for a specific purpose, etc. Decoding can be reliably performed. In addition, it goes without saying that the present invention can be developed in various forms without being limited to the embodiment described above.

[0041]

As described above, according to the discrimination device and the discrimination method of the discrimination control signal of the present invention, when any one or more of the discrimination commands "discrimination command B8 to B10 is" 1 ", , The identification command B3 is always “1” and “when the identification command B11 is“ 1 ”, the identification command B10 is always“ 1 ”” and other characteristics are verified to satisfy the conditions of the identification command. It is configured by adding an identification command characteristic inspection means for checking whether or not it is present. As a result, it is possible to reinforce the function of erroneous detection discrimination and prevent erroneous detection of the identification command to be output, and it is possible to prevent erroneous operations such as decoding of reinforcement signals and screen mode switching in response to the output of the identification command. .

Further, in the discrimination control signal discrimination apparatus and discrimination method according to claims 4 and 8, "when any one or more of the reinforcement signal bits of B8 to B10 is" 1 ", B
Since the letterbox signal of 3 is always "1" is used to detect the letterbox signal, it is possible to reliably and stably detect the letterbox signal and reproduce the EDTV-II signal. It is possible to surely decode the identification control signal.

[Brief description of drawings]

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

FIG. 2 is a block circuit diagram showing a discrimination control signal discriminating apparatus of the present invention.

3A and 3B are diagrams showing an outline of an identification control signal of EDTV-II, FIG. 3A is a diagram showing an identification control signal waveform, and FIG. 3B is a diagram showing bit positions and identification contents.

FIG. 4 is a block circuit diagram showing a discrimination control signal discriminating apparatus according to the present invention.

FIG. 5 is a block circuit diagram showing a conventional identification control signal determination device.

[Explanation of symbols]

 1 Horizontal Sync Signal Hsync 2 Color Burst 3 NRZ 4 Color Subcarrier (fsc) 5 Confirmation Signal 6, 12 Input Unit 7 Bit Decode Circuit 8 EDTV-II Signal Detector 9 Discrimination Circuit 10 Output Control Circuit 11, 16 Output Unit 13 Parity Check circuit 14 CRC check circuit 15 False detection discrimination circuit 21 Antenna 22 Tuner 23 VIF 24 A / D converter 25 Three-dimensional Y / C separator 26 Motion detector 27 Discrimination control signal processor 28 Timing generator 29 C / HH 'separation 30 HH demodulator 31 Color demodulator 32 Adder 33 Matrix 34 CRT 100 Discrimination command characteristic check circuit HH High-frequency luminance signal HH 'Horizontal resolution enhancement signal after frequency shift VH Vertical high-frequency component of luminance signal VT Vertical time resolution enhancement signal

Claims (8)

[Claims] 1. A method for discriminating an identification control signal for receiving and processing a second-generation high-definition television signal having an identification control signal, wherein a parity check of the identification command bits B3 to B5 is performed by an identification command bit B4. A parity check step to perform, an error detection step to detect an error in the identification command bits B3 to B17 by an error detection code of the identification command bits B18 to B23, and a condition check of the identification command by verifying characteristics of the identification command. An identification control signal determination method comprising: an identification command characteristic inspection step to be performed; and an erroneous detection determination step of determining erroneous detection of the identification command from inspection results of these steps. 2. The characteristic of the identification command is that "the identification command bit B3 is always" 1 "when any one or more of the identification command bits B8 to B10 is" 1 "". The method for discriminating an identification control signal according to claim 1. 3. The identification control according to claim 1, wherein the characteristic of the identification command is “when the identification command bit B11 is“ 1 ”, the identification command bit B10 is always“ 1 ””. How to distinguish signals. 4. The identification control using the characteristic of the identification command "when one or more of the identification command bits B8 to B10 is" 1 ", the identification command bit B3 is always" 1 "". The method for discriminating an identification control signal according to claim 1, wherein a letterbox signal of the signal is discriminated. 5. An identification control signal discriminating apparatus for receiving and processing a second-generation high-definition television signal having an identification control signal, wherein a parity check of the identification command bits B3 to B5 is carried out by an identification command bit B4. Parity checking means for performing, error detecting means for performing error detection of the identification command bits B3 to B17 by the error detection code of the identification command bits B18 to B23, and characteristic checking of the identification command by verifying the characteristics of the identification command. And an erroneous detection discriminating unit which discriminates erroneous detection of the discriminating command from the inspection results of the parity checking unit, the error detecting unit, and the discriminating command characteristic checking unit. Identification control signal discriminating device. 6. The characteristic of the identification command is that "the identification command bit B3 is always" 1 "when at least one of the identification command bits B8 to B10 is" 1 "". The discrimination device of the discrimination control signal according to claim 5. 7. The identification control according to claim 5, wherein the characteristic of the identification command is “when the identification command bit B11 is“ 1 ”, the identification command bit B10 is always“ 1 ””. Signal discriminating device. 8. The identification control using the characteristic that "the identification command bit B3 is always" 1 "when any one or more of the identification command bits B8 to B10 is" 1 "" of the identification command. The discriminating device for discriminating control signals according to claim 5, wherein the discriminating device is a letterbox signal.