JPH02179095A - Color video signal processor - Google Patents

Abstract

PURPOSE:To correctly perform arrangement and correction by providing a means to extract a color identification signal and a means to generate data to verify the adaptability of the color identification signal, combining an extracted color identification signal with verifying data, and inserting it to a prescribed position. CONSTITUTION:A TCI signal is regenerated by a magnetic head 2 and demodulated by a frequency demodulator 3, and a digital signal converted by an A/D converter 4 is inputted to a color identification signal conversion circuit 5. The circuit 5 extracts the color identification signal ID from a digitized TCI signal, and also, verifies the adaptability of the signal based on the signal DO of a drop-out detection circuit 6. An identification signal ID' is generated by combining the qualified data with the color identification signal ID, and inserted again into the forefront of a chrominance signal C at the prescribed position of the TCI signal. The identification signal data ID' and the chrominance signal C can be handled as one signal by performing such re-inserting operation.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a device for processing a reproduced color video signal of, for example, a VTR (video tape recorder), and particularly relates to a device for processing a reproduced color video signal of a VTR (video tape recorder), and in particular, a luminance signal and a line-sequential processing device. The present invention relates to a color video signal processing device in which a plurality of types of color signals are time-axis multiplexed.

(Prior Art) A segment recording method is known as a method for recording wideband video signals such as high-definition television signals.

When recording video signals on diagonal tracks on a recording medium using a rotating head like a VTR, this is a method in which one field of video signals is divided into multiple tracks and recorded on one track. The video signal unit that is transmitted is called a segment.

In this segment recording method, one field of video signal is divided into multiple tracks and recorded, so depending on the division method, there is a possibility that the joints of segments will appear on the screen when reconstructing one field of video signal during playback. be. A shuffling process is a method for eliminating this seam. Shuffling processing is a method that distributes screen information evenly to each segment when dividing a video signal into multiple segments, such as dividing one field of screen into each segment from the top horizontally scanning line by line. be.

In addition, as one of the recording methods for image recording and reproducing devices such as VTRs, TCI (time compressed integral
ion ) method is attracting attention. This is the luminance signal (Y
) and two types of color signals (wideband color signal CW + narrowband color signal CM) are compressed in the time axis, multiplexed, and transmitted in one system, and the color signals CW and CN are transmitted for each horizontal scanning line. It is transmitted line sequentially. Therefore, the color signal CW rCN
In order to always maintain a line-sequential relationship, a color identification signal (called a C index) is inserted to identify the type of color signal, ie, CW or CN, during recording, and a color identification signal (called a C index) is inserted during playback based on this color identification signal. Both color signals C, , CN are arranged alternately.

However, when TCI signals are recorded using the segment recording method using shuffling processing as described above, the correlation between the preceding and following horizontal scanning lines within each segment is low due to the shuffling processing. Put it away.

Therefore, the color signal Cw.

Since highly correlated horizontal scanning lines that need to be rearranged in order to perform array correction processing to maintain the line sequential relationship of CN are divided into front and rear segments,
It is impossible to perform alignment correction if the arrangement is as it is.

Therefore, when performing color signal arrangement correction on TCI signals recorded in segments by shuffling processing, the TCI signals and color identification signals reproduced from the recording medium are deshuffled on the -H field memory, and then the arrangement correction processing is performed. It is necessary to do this. In this case, as a specific method for deshuffling processing, the TC is stored in the field memory.
When writing the I signal, a method can be considered in which the color identification signal is written as is and the deshuffling process is performed. but,
In this method, the color identification signal is extracted for the first time when reading the signal after deshuffling from the field memory, so there is no remedy if the color identification signal part is not reproduced correctly due to dropouts, etc. Color signal arrangement correction cannot be performed.

(Problem to be Solved by the Invention) As described above, when a TCI signal recorded using the segment recording method is subjected to shuffling processing, the TCI signal including the color identification signal is deshuffled on the same field memory during deshuffling. Then, there is a problem in that if the color identification signal is not reproduced correctly, the arrangement of color signals cannot be corrected correctly.

In view of these points, the present invention has been proposed to perform shuffling processing on Tel signals recorded using the segment recording method to perform color signal arrangement correction by deshuffling processing.
It is an object of the present invention to provide a color video signal processing device capable of correctly correcting the arrangement even when a color identification signal inserted into a signal is not correctly reproduced.

[Structure of the Invention] (Means for Solving the Problem) The present invention provides a method in which a luminance signal and a plurality of types of line-sequential color signals are time-base compression multiplexed, and a color identification signal indicating the type of the color signal is multiplexed. A device that processes a color video signal inserted during a predetermined period extracts a color identification signal from the color video signal, verifies the suitability of this color identification signal, and combines the verification data and the color identification signal to produce a color video. Its basic feature is that it includes means for inserting the signal into a predetermined position.

Furthermore, the color video signal into which the color identification signal and its verification data have been inserted is subjected to, for example, deshuffling processing corresponding to the shuffling processing performed on the color video signal, and then the arrangement of the color signals is corrected. .

(Function) In the present invention, the color identification signal in the color video signal is extracted and reinserted into the color video signal together with the verification data indicating its suitability, so even after deshuffling the color video signal after this insertion, the color identification signal can be easily extracted. You can tell whether the color identification signal is correct or not. Therefore, based on this color identification signal and verification data, the arrangement of color signals can be corrected appropriately.

(Embodiment) FIG. 1 shows the configuration of a color video signal processing device according to an embodiment of the present invention. In this embodiment, the video signal for one field is divided into three segments as shown in FIG.
As shown in Figure (a), V records/reproduces a Tel signal into which a color identification signal ID indicating the type of color signal C (wideband color signal CW or narrowband color signal N) is inserted within the horizontal scanning period.
An example in which the present invention is applied to the reproduction side of a TR will be described.

In FIG. 1, a Tel signal shown in FIG. 3(a) is recorded on a magnetic tape 1 as an FM modulated wave. This T
The el signal is reproduced by the magnetic head 2 and sent to the FM demodulator 3.
After being demodulated by the A/D converter 4 as shown in FIG.
), the signal is converted into a digital signal and then input to the color identification signal conversion circuit 5. Further, the Tel signal reproduced by the magnetic head 2 is also input to the dropout detection circuit 6. The dropout detection circuit 6 performs amplitude detection by envelope detection of the input Tel signal, and when the amplitude falls below a predetermined amplitude, a dropout occurs when the magnetic head 2 reproduces from the magnetic tape 1. Specifically, the dropout detection signal Do is supplied to the color identification signal conversion circuit 5.

The color identification signal conversion circuit 5 extracts the color identification signal ID from the digitized Tel signal inputted from the A/D converter 4, and detects the suitability of the color identification signal ID using a dropout detection signal D.
o, and use the verification data as the color identification signal ID.
are combined to form identification signal data ID', which is reinserted at a predetermined position of the Tel signal, for example, at the beginning of the color signal C, as shown in FIG. 3(e). By this reinsertion operation, the identification signal data ID' and the color signal C can be treated as one signal.

The timing generation circuit 7 generates a clock signal CKI to be supplied to the A/D converter 4 and the color identification signal conversion circuit 5 based on the Tel signal output from the FMul:j11 circuit 3.
Horizontal synchronization signal H5yn supplied to color identification signal conversion circuit 5
Generate cl.

The Tel signal outputted from the color identification signal conversion circuit 5 after reinsertion of the identification signal data ID' is input to two field memories 8.9. The field memories 8 and 9 are controlled by a memory control circuit 10, and the input T
The el signal is subjected to deshuffling processing to reconstruct the screen divided into three segments into one field. In this case, the states of the two field memories 8.9 are alternately switched for each field so that the write state and read state do not overlap with each other.

The TCI signal restored as a color video signal constituting one field of video on the field memory 8.9 is separated into a brightness signal Y and a color signal C by a Y/C (luminance signal and seven color signals) separation circuit 11. Ru. On the TCI signal, the luminance signal Y and the color signal C have been subjected to time axis conversion (time axis compression), so they are each subjected to time axis inverse conversion (time axis expansion) by the time axis inversion circuits 12 and 13, thereby changing the time axis. is restored. Of the luminance signal Y and color signal C output from these time axis inversion circuits 12 and 13, the luminance signal Y
is output as is from the output terminal 18, and the color signal C is manually inputted to the array correction circuit 14, color identification signal extraction circuit 15, and timing generation circuit 16.

The color identification signal extraction circuit 15 extracts identification signal data ID consisting of a color identification signal ID and its verification data, which is reinserted at the beginning of the color signal C by the color identification signal conversion circuit 5 as shown in FIG. 3(C). ' is extracted and supplied to the arrangement correction circuit 14. Further, the timing generation circuit 16 generates a horizontal synchronization signal H based on the color signal C output from the time axis inversion circuit 13.
5ync2 and a clock signal CK2 are generated and supplied to the color identification signal extraction circuit 15.

The arrangement correction circuit 1-4 rearranges the two types of color signals C, CN so that the line-sequential relationship of the color signals is maintained.

This operation is called color signal arrangement correction.

The color signal C subjected to the arrangement correction is sent to a line-sequential inverse conversion circuit 17, where two types of color signals Cw and CN are separated and outputted from output terminals 19a and 19b, respectively.

Next, the color identification signal conversion circuit 5 shown in FIG. 1 will be explained in detail. FIG. 4 shows a specific example of the color identification signal conversion circuit 5, in which the input signals include the digitized TCI signal from the A/D converter 4 and the dropout detection signal DO from the dropout detection circuit 6. , a horizontal synchronization signal H5ynct from the timing generation circuit 7, and a clock signal CKI. The counter 21 counts the clock signal CKI and is reset by the horizontal synchronization signal H5yncl, so that its contents represent the position of the digitized TCI signal from the horizontal synchronization signal H5yncl. The comparator 22 detects the position where the color identification signal ID is inserted from the output of the counter 21, and supplies the position detection pulse to the latch circuit 23 as a latch pulse. Therefore, the latch circuit 23 latches the color identification signal 10 in the T(l signal. The comparator 24 compares the output of the latch circuit 23 with a predetermined threshold, and if it is equal to or greater than the threshold, the
, otherwise it is converted into 1-pit digital data such as "0°".

On the other hand, the dropout detection signal DO is, for example, "1" when a dropout has occurred, and "0" otherwise. By latching the detection pulse as a latch pulse, it is verified whether a dropout has occurred during the detection of the color identification signal ID.In other words, the verification data that is the output of the latch circuit 25 is "lo" when the comparator Indicates that the color identification signal ID output from 24 is not detected correctly, and “
0'' indicates that the color identification signal ID is correctly detected.

The verification data output from this latch 25 and the comparator 2
The color identification signals ID output from 4 are combined and the 5th
As shown in the figure, it is assigned to the lower two bits of the eight quantized bits of the TCI signal. This color identification signal I
The combination data of D and verification data is identification signal data ID'
It is. This identification signal data ID' is applied to the b input of a selector 27 controlled by the output of the comparator 26. Further, the a input of the selector 27 is given a digitized TCI signal. The comparator 26 detects the leading position of the color signal C of the TCI signal based on the output of the counter 21, and supplies a position detection pulse to the selector 27. The selector 27 selects the b input side when a position detection pulse is applied from the comparator 26, and selects the a input side at other times. As a result, the selector 27 outputs a TCI signal in which identification signal data ID' is added to the beginning of the color signal C as shown in FIG. 2(C).

Next, the color identification signal extraction circuit 15 in FIG. 1 will be explained with reference to FIG. 6. FIG. 6 shows a specific example of the color identification signal extraction circuit 15, in which the input signal is Y/C.
Color signal C from separation circuit 11 and timing generation circuit 1
Horizontal synchronization signal H5ync2 and clock signal C from 6
K2 is given. The horizontal synchronization signal H5ync2 and the clock signal GK2 are synchronized with the color signal C. counter 3
1 counts the clock signal CK2 and outputs the horizontal synchronization signal H.
Since it is reset by H5ync2, its contents represent the position of the manually inputted color signal C from the horizontal synchronizing signal H5ync2. The comparator 32 detects the position where the identification signal data ID' is inserted from the output of the counter 31, and supplies the position detection pulse to the latch circuit 33 as a latch pulse. Therefore, the latch circuit 33 receives the input color signal C.
The identification signal data ID' added to the beginning of is latched and outputted to the array correction circuit 14 in FIG.

Next, the arrangement correction circuit 14 in FIG. 1 will be explained in detail. FIG. 7 shows a specific example of the arrangement correction circuit 14, in which the input signal is the line sequential color signal C (Cw) from the time axis inversion circuit 13.

CN) and identification signal data ID' from the color identification signal extraction circuit 15 are input. The line sequential color signal ID' is input to two cascade-connected IH delay circuits 41 and 42 and an H counter 45 that counts horizontal synchronization signals, and the identification signal data ID' is input to two cascade-connected latch circuits 43. ．．
44. The latch circuit 43 is the identification signal data I.
Every time D' is input, it is used as the next identification signal data ID'.
Hold until it is manually operated. Similarly, the latch circuit 44 also uses the output of the latch circuit 43 as the next identification signal data ID.
' is held until input.

The inputs and outputs of the IH delay circuits 41 and 42, that is, the inputs and outputs of the IH delay circuit 41 and the output of the IH delay circuit 42, are input to a selector 47 controlled by a control circuit 46. The control circuit 46 receives the identification signal data ID' (manual power of the latch circuit 43), the output of the H counter 45, and the outputs of the latch circuits 43 and 44.

The output of selector 47 is input to selector 48 . The selector 48 is controlled by the control circuit 46 and selects either the output of the selector 47 or the output of the 2H delay circuit 49. The output of the selector 48 is input to the 2H delay circuit 49 and the line sequential inverse conversion circuit 17 in FIG.

The input/output (points D, E, and F) of the latch circuits 43 and 44 have color identification that indicates the type of color signal appearing at the input and output (points A, B, and C) of the IH delay circuit 41.42. Identification signal data ID' consisting of a signal ID and its verification data appears. These, E.

Identification signal data ID' of points A, B, and C appearing at point F
The count result of the H counter 45 is sent to the control circuit 4.
6 is input. Here, there are 23-8 combination patterns of color identification signals ID in the identification signal data ID' input to the control circuit 46, and the output of the H counter 45 (horizontal scanning line number) for one combination pattern. Which of the two color signal outputs, CW and CN, is required depending on the color identification signal! D’s entrance/exit cover turn (
As shown in FIG. 8, there are 16 combination patterns of the color identification signal ID and the type of color signal to be output. A for each input/output cover turn with the selector 47;
The signal outputs that can be selected from points B and C are "0" to rBJ.
There are Fit types. Selectable signal output is “0” or “1”
”, the input/output cover turns and outputs correspond one-to-one, such as when rOJ is an error signal and when “1” is A, B, or C.

On the other hand, if the signal output that can be selected by the selector 47 is "2" or "3", any one may be selected in order to maintain the line sequential relationship. However, in order to obtain good image quality, it is desirable to use color signals sent during the horizontal scanning period of a scanning line as close as possible to the corresponding horizontal scanning line.

Therefore, the control circuit 46 calculates the horizontal scanning line number to be currently output based on the output of the H counter 45 and the horizontal scanning line number of the signals output from each point A, B, and C. Alternatively, a control signal is supplied to the selector 47 so as to select the color signal of the point whose horizontal scanning line number is closest to the horizontal scanning line number to be currently output from among the three color signals.

In this way, the selector 47 selects, based on the control signal from the control circuit 46, the type (Cw
or CN) and is temporally closest, that is, the color signal of the horizontal scanning line closest to the horizontal scanning line to be output is selected.

When the control circuit 46 cannot find selectable color signals at points A, B, and C, the verification data in the identification signal data ID' at points E and F is "l#," in other words, the input/output cover pattern in the m8 diagram. When the signal output that can be selected for is "0", an error signal is output to the selector 48. Normally, the selector 48 selects the output of the selector 47 and outputs it as is, but when it receives an error signal, it selects the output of the 2H delay circuit 49 and outputs the 2H previous color signal, that is, the same type of color signal as the currently output color signal. Outputs color signals.

In this way, the output of the selector 48 is a line-sequential color signal whose arrangement has been corrected. As shown in FIG. 1, the output of the selector 48 is separated from the CW multiplied signal CN signal by the line sequential inverse conversion circuit 17, and is sent to the CW multiplied signal terminal 19a.
The signals are output to terminals 19b, respectively.

[Effects of the Invention] According to the present invention, by extracting a color identification signal from a color video signal and reinserting it into the color video signal together with verification data indicating its suitability, shuffling processing is performed and segment recording is performed. When correcting the arrangement of color signals by performing deshuffling processing after reproducing the recorded TCI signal, even when the color identification signal inserted into the TCI signal is not correctly reproduced, the arrangement can be corrected correctly.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a color video signal processing device according to an embodiment of the present invention, FIG. 2 is a diagram showing a segment recording format of a color video signal to be processed in this embodiment, and FIG. 3 is a signal waveform diagram for explaining the operation of the same embodiment, FIG. 4 is a block diagram showing a specific example of the color identification signal conversion circuit in FIG. 1, and FIG. 5 is for explaining the operation of the color identification signal conversion circuit. FIG. 6 is a diagram showing a concrete example of the color identification signal extraction circuit in FIG. 1, FIG. 7 is a diagram showing a concrete example of the arrangement correction circuit in FIG. 1, FIG. 8 is a diagram for explaining the operation of the arrangement correction circuit of FIG. 7. 5... Color identification signal conversion circuit, 6... Dropout detection circuit, 8.9... Field memory, 14...
Array correction circuit, 15... color identification signal extraction circuit. Applicant's agent Patent attorney Takehiko Suzue Daizuda

Claims (3)

[Claims] (1) In a device that processes a color video signal in which a luminance signal and multiple types of line-sequential color signals are time-base compression multiplexed, and a color identification signal indicating the type of color signal is inserted in a predetermined period. , color identification signal extraction means for extracting the color identification signal from the color video signal; verification data generation means for verifying the suitability of the color identification signal extracted by this means and generating verification data; and the color identification signal. A color video signal processing device comprising: means for combining the color identification signal extracted by the extraction means with the verification data and inserting the combination into a predetermined position of the color video signal. (2) A luminance signal and multiple types of line-sequential color signals are time-base compression multiplexed, a color identification signal indicating the type of color signal is inserted in a predetermined period, and further shuffling processing is performed. An apparatus for processing a color video signal, comprising a color identification signal extraction means for extracting the color identification signal from the color video signal, and verification data for verifying the suitability of the color identification signal extracted by the means and generating verification data. generating means; means for combining the color identification signal extracted by the extraction means with the verification data and inserting the combination into a predetermined position of the color video signal; and performing deshuffling processing on the color video signal obtained by the means. and a color signal arrangement correction means that receives the color video signal deshuffled by the means and corrects the arrangement of a plurality of types of color signals in the color video signal. Processing equipment. (3) The color signal array correction means includes: a plurality of one horizontal scanning period delay circuits that delay the input color video signal; a counter that counts horizontal synchronization signals in the color video signal; holding means for holding the contents of the color identification signal and its verification data corresponding to the outputs of the horizontal scanning period delay circuits; 3. The color video signal processing apparatus according to claim 2, further comprising means for selecting one of the outputs.