JP2001094950A - Video id signal processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a video ID signal processor, that is used in an interlace- progressive converter and reduces the occurrence of malfunctions, when a pull- down information is outputted in the converter. SOLUTION: The video ID signal processor is provided with a video ID signal detector 102, that detects the pull-down information that denotes from which frames a current field being one of ID information sets is generated, a pull-down information correction device 103 that keeps a sequence of the pull-down information to output a pull-down information signal, even when other information is inserted and an IP converter 104 that conducts IP conversion in response to a pull-down information correction output signal from the pull-down information correction device 103. The video ID signal processor can conduct IP conversion with few errors, on the basis of the received video ID pull-down information.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video ID detecting / processing apparatus in a television receiver capable of converting an interlaced signal into a progressive signal and displaying the converted signal.

[0002]

2. Description of the Related Art In recent years, it has been emphasized in the television industry to double a current interlace signal, perform progressive scanning, and display an image with less flicker. Various methods have been proposed for interlace-progressive conversion (hereinafter, referred to as IP conversion), but any of these methods involves a malfunction during scanning line interpolation in a moving image. In such a situation, a video ID signal using a vertical blanking period is provided by EIAJ (Japan Electronics Industry Association) so that a signal that is originally a progressive signal converted to an interlace signal does not cause a malfunction during IP conversion. It has been established as a standard to insert a signal for avoiding the above problem into a part of the above. Here, the standard of the video ID signal will be described with reference to FIG.

[0003] As shown in the figure, a video ID signal includes a horizontal synchronizing signal H.SYNC and a color burst signal CB, followed by N.
RZ (Non Return to Zero) waveform reference signal R
ef and identification information (1 to 20 bits) are transmitted. FIG. 7 shows the identification contents of such a video ID. Video ID is composed of 2 bits WORD0, 4
It is formed of a WORD1 composed of bits, a WORD2 composed of 8 bits, and a 6-bit CRC code.

Then, WORD0 (bit1, bit1)
2) is identification information on the transmission format of the video signal, and W
ORD1 (bit3 to bit6) is WORD2 to be described later.
Information that specifies the information to be transmitted in WORD2
(Bit7 to bit14) are data information specified by WORD1, and CRC (bit15 to bit20) is a CRC code for error correction. The information for suppressing the malfunction at the time of the IP conversion is W
WOR when ORD1 = "0110" is superimposed
This is indicated by bit8 of D2, which is a movie of 24 frames or 3
When converting a 0-frame CM film into a video signal,
This is information for identifying whether images are from the same frame. An explanation of this content is excerpted below.

[0005] For example, when converting a movie of 24 frames into a video signal (telecine), a video signal of 2 or 3 fields is generated from the same frame. This is called a 3-2 pull-down system. When reproducing this video signal in the above, if there is information on which frame the field was generated from, it is possible to perform scanning line interpolation properly and improve the quality. Field is “frame continuous”, and if generated from different frames, “frame change”
(See FIG. 8). Since other information may be interposed in between, the receiving device takes care to keep the sequence in that section. The sequence referred to here means that, as shown in FIG. 8, in the case of a 24-frame film (hereinafter referred to as 24P), the pull-down information is repeatedly transmitted as "01011", and in the case of a 30-frame film (hereinafter referred to as 30P). ) Indicates that the pull-down information is transmitted by repeating "01". Such a video ID signal detecting device is described in FIG. 9 as disclosed in Japanese Patent Laid-Open No. 8-331528. It is configured as shown in FIG. The description is given below.

In FIG. 9, a signal discriminating apparatus 1 includes a slicer 20 and a microcomputer for control (hereinafter, referred to as a control microcomputer).
(Referred to as “control microcomputer”) 30. The slicer 20 samples the EDTV2 identification control signal or video ID superimposed on a predetermined horizontal line position in the vertical blanking period at a predetermined sampling frequency, and compares the sampled data with a predetermined slice level. This is a decoder for decoding.
The control microcomputer 30 has a video ID or E
A setting data signal such as a horizontal line position, a slice level, and a sampling frequency on which the identification control signal of the DTV 2 is superimposed is output to the slicer 20, and a slice data signal corresponding to the setting data signal is supplied from the slicer 20. . The determination counters 30a and 30b added to the control microcomputer 30 are, for example, 4-bit counters. The detection counters have hysteresis characteristics and count the detection signals supplied from the slicer 20, so that the video I
The identification control signal of D or EDTV2 is determined.

[0007]

However, the above configuration has the following problems. Bit8 of WORD2 representing pull-down information is valid only when “0110” is transmitted in WORD1, and other information, for example, WORD1 = “0011” indicates WORD1 = “0011”.
The header that sends the length of the software and the remaining time in ORD2. If such a header is sent,
bit8 has a completely different meaning. At this time, the pull-down information sent to the IP conversion device is completely random data, and appropriate IP conversion cannot be performed. It is impossible to make the above-mentioned "because other information may be interposed between the devices, the receiving-side device considers maintaining the sequence in that section."

[0008]

In order to solve the above-mentioned problems, a video ID signal processing apparatus according to the present invention comprises a video ID signal detecting apparatus for detecting a video ID signal from an input video input signal.
With the signal detection device and the output signal from the video ID detection device as input, different information is sandwiched between pull-down information indicating from which frame the current field, which is one of the ID information, was generated. Even in such a case, a pull-down information correction device that holds the sequence of the pull-down information and outputs a pull-down information signal, and outputs whether or not the transmitted video ID signal is the pull-down information, and receives the video input signal as an input. And an interlace-to-progressive conversion device for appropriately performing scanning line interpolation based on an output signal from the pull-down information correction device when the video signal is subjected to interlace-to-progressive conversion.

Further, the video ID signal processing device of the present invention, as the pull-down information correction device, identifies whether or not the input video ID signal information is pull-down information and outputs the result, and the identification result is the pull-down information. A pull-down information identification device for outputting the input signal, if any;
Inputting the output of the identification result of the pull-down information identification device, cumulatively counting the identification results of the past several fields, comparing with a certain set value and outputting the result, A pull-down information pattern generator that accumulates and outputs a pull-down information pattern of the past several fields, and a pattern that matches the pattern with the pull-down information pattern when the frame frequency is 24 Hz and 30 Hz, counts the mismatch, and outputs the value. The matching device is compared with the mismatch count value and a certain set value, and the frame frequency is set to 24H.
a pull-down information discriminating device for discriminating between z and 30 Hz and outputting a result, and outputs of a first pulse generating device and a second pulse generating device to be described later, and inputting the video ID signal information; And a phase comparison device that compares each of the two inputs with the two inputs and outputs a reset pulse if the patterns match, and a phase comparison device that is reset by the reset pulse and outputs a pulse train of a pull-down information pattern when the frame frequency is 24 Hz. 1 pulse generator, a second pulse generator which is reset by the reset pulse and outputs a pulse train of a pull-down information pattern when the frame frequency is 30 Hz, an output of the first pulse generator described above and a second pulse generator. Input the output of the pulse generator and output the signal to the output of the pull-down information discriminator. Those having a switching device for switching by.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is a video ID signal processing device characterized in that malfunctions are reduced in an interlace-progressive conversion device, and pull-down information is transmitted to a video ID signal. If there is a section in which other information is interposed, the sequence is determined from the previous pull-down information transmission sequence, and the error-free pull-down information holding the sequence in the IP conversion device is transmitted. Since the video ID signal can be provided without interruption, an appropriate IP conversion using a video ID signal can be performed.

According to a second aspect of the present invention, there is provided a video ID signal detecting device for detecting a video ID signal from an input video input signal, and an output signal from the video ID detecting device as an input. In the case of pull-down information indicating from which frame the current field is generated, even when other information is interposed, the pull-down information sequence is retained and a pull-down information signal is output. A pull-down information correction device for outputting whether or not the video ID signal being transmitted is pull-down information; and, when the video input signal is input and the video signal is subjected to interlace-progressive conversion, the pull-down information correction device outputs Interlaced-to-progressive conversion that appropriately performs scan line interpolation based on output signals And a location, interlaced -
A video ID signal processing device characterized in that a malfunction is reduced in a progressive conversion device. When pull-down information is transmitted in a video ID signal, even if a section in which another information is interposed occurs, the Since the sequence can be determined from the transmission sequence of the previous pull-down information and the error-free pull-down information having the sequence held in the IP conversion device can be provided without interruption, appropriate IP conversion using a video ID signal can be performed. Has the effect of being able to.

According to a third aspect of the present invention, there is provided the pull-down information correcting apparatus according to the second aspect, which determines whether or not the input video ID signal information is pull-down information, outputs the result, and outputs the result. If the result is pull-down information, a pull-down information identification device that outputs its input signal and an output of the identification result of the pull-down information identification device are input, and the identification results of past fields are cumulatively counted.
A pull-down information accumulating / comparing device for comparing with a certain set value and outputting the result, a pull-down information pattern generating device for accumulating input pull-down information and outputting a pull-down information pattern of past several fields, a frame frequency of 24 Hz and 30 Hz In the case of (1), the pattern is matched with the pull-down information pattern, the mismatch is counted, and the value is output.
Hz and 30 Hz, and a pull-down information determining device for outputting a result, a first pulse generator and a second
Input of the pulse generator and the video ID
A phase comparison device that inputs signal information, extracts pull-down information, compares them with the two inputs, and outputs a reset pulse when the patterns match, and a pull-down device that is reset by the reset pulse and has a frame frequency of 24 Hz. First to output pulse train of information pattern
A second pulse generator that is reset by the reset pulse and outputs a pulse train of a pull-down information pattern when the frame frequency is 30 Hz; and a second pulse generator that outputs the first pulse generator and the second pulse generator. 2. The video ID signal processing device according to claim 1, further comprising a switching device for switching a signal to be input and output by the output of the pulse generation device according to the output of the pull-down information discriminating device. When the pull-down information is transmitted to the signal, even if an interval in which another information is interposed occurs, the sequence is determined from the previous transmission sequence of the pull-down information, and the sequence is held in the IP conversion device. Since error-free pull-down information can be provided without interruption, appropriate IP conversion using a video ID signal is performed. It has the effect that it is possible.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1) FIG. 1 is a block diagram showing a video ID signal processing apparatus according to a first embodiment of the present invention. In FIG. 1, 102 is a video ID
A signal detection device; 103, a pull-down information correction device;
Reference numeral 4 denotes an IP conversion device.

The operation of the video ID signal processing device configured as described above will be described below with reference to FIGS. 1, 3, 4 and 5. First, FIG. 3 shows a video ID signal detection device, where 301 is an input terminal to which a video signal is input. Reference numeral 302 denotes a low-pass filter device (hereinafter, referred to as an LPF) for removing high-frequency noise from an input signal.
A level slicer device for setting to "1", a counter device 304 for resetting a count by a reset pulse from a reset pulse generator described later, and a counter device for counting the NRZ signal by a sampling clock, and a reference numeral 305 for a set value 3
If the input signal is large with respect to 0G, the comparator outputs "1". 306 is a video ID output in time series.
A shift register sequentially stores signals in a register prepared for each bit by a reset pulse from a reset pulse generator described later, and holds a 22-bit ID signal including Ref. A shift register 307 detects a synchronization signal from an input video signal. The sync separation device 308 receives a reset pulse at a position shown in FIG. 5 for 22 bits including the Ref of the video ID signal of 20H and 283H in the vertical blanking period according to the horizontal synchronization signal and the vertical synchronization signal from the synchronization separation device. Is a reset pulse generation device that outputs a reset pulse.

FIG. 4 shows an IP conversion apparatus. Reference numeral 401 denotes an input terminal to which a video signal is input. 410 is a pull-down information signal input terminal, 411 is a pull-down information discrimination signal input terminal, 402 is a YC separation device that separates a composite video signal into a luminance signal and a chrominance signal, 403 is a demodulation of a color signal into a color difference signal, and outputs a YUV signal. Color demodulators 404 and 405 convert the YUV signal to 1
A field memory 404 for delaying and outputting a field, a first interpolation signal switch SW 407 for switching a signal for interpolating a scanning line from a signal not passing through the field memory and a signal passing twice through the field memory, 407 and 408 are clocks for writing On the other hand, a line memory 409 outputs a signal at a double speed by reading at twice the clock rate. A line memory 409 detects difference data between a signal that has not passed through the field memory and a signal that has passed twice through the field memory. It is determined whether the signal is a moving image or a still image. If the signal is a moving image, a pulse output to a second interpolation signal switching SW 413 described later is fixed to “0”. If the signal is a still image, “0” is set every 1H cycle. , "1", and 41
1 When a pull-down information discrimination signal is input, a frame difference discrimination device that holds the output pulse in a still picture discrimination state, 410 is a pull-down information signal input terminal, 411 is a pull-down information discrimination signal input terminal, and 412 is a first line A third interpolation signal switching SW 413 for switching a signal to be input to the memory between a signal that does not pass through the field memory and a signal that has passed twice through the field memory is an operation of performing scanning line interpolation between fields or within a field. 4
This is a second interpolation signal switching SW realized by switching the signal with the above-described output pulse from 09.

The video signal input from the input terminal 101 is input to the video ID signal detection device 102 and the conversion device 104, and the input signal of the input terminal 301 and the input terminal 40
1 input signal is obtained. The signal input from the input terminal 301 is input to the LPF 302, and the noise-removed signal 3
Obtain OA. 30A is 0IRE with level slicer 303
The following signals are eliminated, and the NRZ signal 30B of the video ID is removed.
Get. Further, the signal input from the input terminal 301 is separated in synchronization by the sync separator 307 to obtain a horizontal sync signal and a vertical sync signal 30E. By inputting the 30E synchronization signal to the reset pulse generator 308, the R of the video ID signal of 20H and 283H in the vertical blanking period is output.
The reset pulse 30F is obtained at a position as shown in FIG. 5 for 22 bits including ef. NR is added to the counter device 304
When the Z signal 30B and the reset pulse 30F are input, the counter device 304 resets the counter output by the reset pulse, and performs the counting operation in clock units until the next reset pulse comes. As a result, as shown in FIG. The sawtooth wave 30C is output. Comparing the sawtooth wave 30C with the set value 30G, the comparator 305 outputs a logic “1” if the level of the sawtooth wave is higher. This output pulse 30D is updated every reset pulse,
Each time the video ID is updated, the video ID is stored in the shift register 306, and as a result, the video ID is output from the video ID signal output terminal 309.
Get the signal. The obtained video ID signal is output 1 of 102.
0A is input to the pull-down information correction device 103. In the pull-down information correction device, the input video I
It is determined whether the D signal is pull-down information, and as a result, a pull-down information determination signal 10C is obtained.

Further, even when another information is interposed, the pull-down information correction signal 10B is output while retaining the sequence of the pull-down information. In FIG. 4, a pull-down information correction signal 10B is obtained at an input terminal 410. Further, a pull-down information determination signal 10C is obtained at the input terminal 411. An input video signal is input to a YC separation device 402 and separated into a luminance signal and a chrominance signal.
Get A. The YC signal 40A is input to the color demodulation device 403 to demodulate the C signal, and the YUV signal 40B (hereinafter referred to as future FD)
). The obtained YUV signal is delayed by one field by the first field memory 404 to obtain a one-field delayed YUV signal 40C (hereinafter, referred to as the current FD). The current FD signal 40C is converted into a two-field delayed YUV signal 40D (hereinafter referred to as the past F
D). In the case of 40B and 40D, when the pull-down information determination signal is “1”, the pull-down information signal selected by SW 412 becomes the control signal 40H of SW 406, and the output is selected. The outputs 40E and 40C of the SW 406 are double-speed converted by the line memories 407 and 408 to obtain double-speed output signals 40F and 40I. SW413
The operation of the control signal 40J is fixed to a "still image mode" described below in which the frame difference determination device 409 repeats "0" and "1" every H in response to the "1" input of the pull-down information determination signal. , 40H which is a pull-down information signal
A future FD or a past FD selected in step (1) is output and IP conversion is performed based on the pull-down information, and an IP conversion output YUV signal is obtained at an output terminal 414.

This operation will be described with reference to FIG. 8. For example, when the current FD 40C is A2, the past FD 40D is A2.
1. The future FD 40B is B1. Since the pull-down information at this time is “1”, SW 406 is set to 40
D, that is, the past FDA1 is selected. Thereby, the state of A1A2 of the IP conversion video output of FIG. 8 is realized. When the pull-down information discrimination signal is “0”, SW
No pull-down information signal is selected by 412, and the control signal 40H is fixed at "1". Therefore, 40E becomes a past FD signal. At this time, the difference data between the frames is detected from 40B and 40D by the frame difference determination 409,
If the difference is small and the image is determined to be a still image, SW41 is used as described above.
Scan line interpolation between fields is performed by the switching operation of No. 3, and an IP conversion output YUV signal is obtained at the output terminal 414.
If the difference is large and it is determined that the moving image is a moving image, 40J = "0" is set, the switching by the SW 413 is not performed, the intra-field scanning line interpolation is performed in the current FD, and the IP conversion output YUV signal is obtained at the output terminals 414 and 104.

As described above, according to this embodiment, a pull-down information correction device is provided which holds a sequence of pull-down information and outputs a pull-down information correction signal even when another information is interposed therebetween. This can reduce malfunctions in the interlace-progressive conversion device.

(Embodiment 2) FIG. 2 is a block diagram showing a video ID signal processing apparatus according to a second embodiment of the present invention. In FIG. 2, reference numeral 201 denotes an input terminal. 202 is a video ID detection device, and 208 is an IP conversion device. The contents are the same as those of the video ID detection device 102 and the IP conversion device 104 described in the first embodiment, and a detailed description will be omitted. Reference numeral 203 denotes a pull-down information identification device which receives a video ID signal and
ORD1 is identified, and if "0110", WORD2
"1" is output to the bit8 pull-down information and the pull-down information identification signal of "1", and all outputs are set to "0" if they are other than "0110". Reference numeral 210 denotes a pull-down information pattern generator which stores pull-down information for the past 15 fields in a shift register and outputs it as a pull-down information pattern. The reason for the 15 fields is that 24P has a 5-field 1 sequence of "01011" and 30P has a 2-field 1 sequence of "01", so that both fields have the least common multiple fields in the pattern matching described later so that they do not end in the middle of the sequence. If matching is performed by the device, data for 10 fields is required, that is, for example, “01011010” for 24P.
That is, it is only necessary to be able to determine the presence of “11.” If there is at least 15 fields of data, the presence of “0101101011” can be confirmed regardless of which field of the current field is “01011”. However, when the pull-down information discrimination signal is "0", the sequence is not incremented in the fifteen fields and only the sequence is advanced by one. A pull-down information pattern can be held.

Reference numeral 213 denotes a pull-down information accumulation / comparison device, which inverts the input pull-down information identification signal, performs cumulative counting over several fields, compares it with a certain set value, and if the value is small, it is "1". Is output.

Reference numeral 211 denotes a pattern matching device.
Patterns “0101101011” and “01010101010” for 10 fields in 24P and 30P
1 "is held in advance, and the input 15-field data pattern and 10 fields from the head, 10 fields from the second data, and 10 fields from the third data
Field, 10 fields from the 4th data and 10 fields from the 5th data are matched 5 times, the number of each inconsistent data is counted, and the minimum value is set as the probability data of 24P and 30P. Output. For example, if the input signal is 24P, the probability data of 24P is "0" and the probability data of 30P is "5". 2
Reference numeral 04 denotes a pull-down information discriminating device, which compares two set values, which are two 24P / 30P comparators, with two input signals, and outputs "1" if the input signal is small and "0" if the input signal is large. Each is output, and when the data combination is (24P, 30P) = (1, 0), 1 is output as the output data of the pull-down information discriminating apparatus when the combination is (0, 1), and (1, 1) is output. Or, in the case of (0, 0), the previous output is held. 205 is a phase comparison device. Reference numeral 206 denotes a first pulse generator, which repeatedly outputs "01011" in a 5-field cycle when a reset pulse is input. A second pulse generator 207 repeatedly outputs "01" in a two-field cycle when a reset pulse is input. 207 is a signal switching SW.

The operation of the video ID signal processing device configured as described above will be described below with reference to FIG.

A video signal is input from an input terminal 201 and an input of a video ID signal detection device 202 is obtained. From 202, a 22-bit video ID signal 20A is obtained as an output signal. 20A is input to the phase comparator 205 and stored in a 5-bit and 2-bit shift register. Also,
The output signal 20E of the first pulse generator 206 and the second
The output signal 20D of the pulse generator 207 is input to the phase comparator 205 and is similarly stored in a 5-bit and 2-bit shift register. The 5-bit and 2-bit data are compared, and if they match, a reset pulse output 20 is output.
G and 20F are obtained, respectively. With this reset pulse, the first pulse generator 206 outputs “01011” in order, and as a result, 24P pulse output 2 with the latest phase
Continue to output 0E.

Similarly, the second pulse generator 207 outputs "0"
1 "in order, and as a result, continuously outputs the 30P pulse output 20D at the latest phase. The video ID signal 20A is input to the pull-down information identification device 203, and as described above, the pull-down information identification signal 20K and the pull-down information A signal 20B is obtained, and 20B and 20K are input to the pull-down information pattern generator 210, and a pull-down information pattern signal 20 of 15 fields in which a pull-down transmission pattern is maintained even when other information is interposed as described above.
Get H. 20K is also input to 213, which is compared with the set value 200 as described above, and the pull-down information determination signal 2
0P is obtained and output to the IP conversion device 208. 20H is input to the pattern matching device 211, and 24P probability data 20N and 30P probability data 20I are obtained as described above. 20N and 20I are pull-down information discriminating devices 204
Is compared with the 24P determination set value 20L and the 30P determination set value 20M, and the pull-down information control signal 20C is obtained as described above. The 24P pulse 20E holding the latest phase and the 30P pulse 20D holding the latest phase are input to the signal switching SW 207, and the higher probability is selected from the 24P and 30P by the pull-down information control signal 20C, and the IP conversion is performed as the pull-down information 20J. Device 208
Output to

As described above, according to this embodiment, the IP conversion device is provided with a device for generating pull-down information holding the latest phase by phase comparison and a device for determining and switching the pull-down transmission pattern from past fields. Appropriate pull-down information can be provided, and malfunction in the interlace-progressive conversion device can be reduced.

In the first embodiment, the input signal is assumed to be a composite signal. However, if the input signal is an S terminal input (YC signal), the YC separation device 402 is not required.
With a V input, no additional color demodulator is required.

[0029]

As described above, the present invention provides a video ID signal detecting device for detecting a video ID signal from an input video input signal, an output signal from the video ID detecting device as an input, and one of ID information. If the pull-down information indicating from which frame the current field was generated is held, even if other information is interposed, the pull-down information sequence is retained, a pull-down information signal is output, and transmitted. A pull-down information correction device that outputs whether or not the video ID signal is pull-down information, and an input signal of the video input signal, and when the video signal is subjected to interlace-progressive conversion, an output signal from the pull-down information correction device is output. Interlaced-progressive conversion device for appropriately performing scanning line interpolation based on It is thereby possible to be to reduce the malfunction.

[Brief description of the drawings]

FIG. 1 is a block diagram of a video ID signal processing device according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a video ID signal processing device according to a second embodiment of the present invention;

FIG. 3 is a block diagram of a video ID detecting apparatus according to the first and second embodiments of the present invention;

FIG. 4 is a block diagram of an IP conversion device according to the first and second embodiments of the present invention;

FIG. 5 is an explanatory diagram of the operation of the video ID detection device according to the first and second embodiments of the present invention.

FIG. 6 is a diagram showing a video ID signal waveform.

FIG. 7 is a diagram showing video ID code assignment.

FIG. 8 is an explanatory diagram of a pull-down information transmission sequence.

FIG. 9 is a block diagram of a conventional video ID signal processing device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Signal discrimination device 20 Slicer 30 Control microcomputer 30a, 30b Decision counter 101, 201, 301, 401, 410, 411 Input terminal 102, 202 Video ID signal detection device 103 Pulldown information correction device 104, 208 IP conversion device 105, 209, 309, 414 Output terminal 203 Pulldown information identification device 204 Pulldown information determination device 205 Phase comparison device 206, 212 Pulse generation device 207, 406, 412, 413 Switching SW 210 Pulldown information pattern generation device 211 Pattern matching device 213 Pulldown information accumulation comparison device 302 LPF 303 Level slicer 304 Counter 305 Comparator 306 Shift register 307 Synchronous separator 308 Reset pulse generator 402 YC separation device 403 Color demodulation device 404, 405 Field memory 407, 408 Line memory 409 Frame difference discrimination device

Continued on the front page (72) Inventor Hiroshi Moribe 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Hisao Morita 1006 Oji Kadoma Kadoma City Osaka Pref. Inventor Hitoshi Ando 1006 Kazuma Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F term (reference) 5C063 BA04 BA09 BA10 CA03 CA14 CA23 CA38

Claims (2)

[Claims] 1. A video I signal from an input video input signal
A video ID signal detecting device for detecting a D signal, and pull-down information indicating from which frame the current field, which is one of the ID information, is generated by inputting an output signal from the video ID detecting device, are separately provided. A pull-down information correction device that holds a sequence of the pull-down information, outputs a pull-down information signal, and outputs whether or not the transmitted video ID signal is the pull-down information, An interlace-to-progressive conversion device that receives the video input signal as input and performs scanning line interpolation appropriately based on an output signal from the pull-down information correction device when the video signal is subjected to interlace-to-progressive conversion. ,
A video ID signal processing device characterized in that a malfunction is reduced in an interlace-progressive conversion device. 2. A pull-down information identifying device for identifying whether or not input video ID signal information is pull-down information and outputting the result, and outputting the input signal if the identification result is the pull-down information; Inputting the output of the identification result of the identification device, accumulatively counting the identification results of the past several fields, comparing with a certain set value and outputting the result, and accumulating the input pull-down information, A pull-down information pattern generating device that outputs a pull-down information pattern of several fields, and a pattern matching device that matches the pattern with the pull-down information pattern when the frame frequency is 24 Hz and 30 Hz, counts the mismatch, and outputs the value. , The mismatch count value is compared with a certain set value, and the frame frequency is A pull-down information discriminating device for discriminating between 24 Hz and 30 Hz and outputting the result, an output of a first pulse generating device and a second pulse generating device described later are input, and the video ID signal information is input, and pull-down information is input. And a phase comparison device that compares each of the two inputs with the two inputs and outputs a reset pulse if the patterns match, and a phase comparison device that is reset by the reset pulse and outputs a pulse train of a pull-down information pattern when the frame frequency is 24 Hz. 1 and the pulse frequency is reset by the reset pulse, and the frame frequency is 30 Hz.
And a second pulse generator for outputting a pulse train of the pull-down information pattern, and a signal for inputting and outputting the output of the first pulse generator and the output of the second pulse generator as described above. 2. The video ID signal processing device according to claim 1, further comprising a switching device for switching according to an output of the device.