WO2006067879A1 - 映像信号処理装置 - Google Patents
映像信号処理装置 Download PDFInfo
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- WO2006067879A1 WO2006067879A1 PCT/JP2005/010559 JP2005010559W WO2006067879A1 WO 2006067879 A1 WO2006067879 A1 WO 2006067879A1 JP 2005010559 W JP2005010559 W JP 2005010559W WO 2006067879 A1 WO2006067879 A1 WO 2006067879A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/77—Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase
- H04N9/78—Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase for separating the brightness signal or the chrominance signal from the colour television signal, e.g. using comb filter
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/44—Colour synchronisation
Definitions
- the present invention relates to a video signal processing apparatus provided with means for separating a composite video signal into a luminance signal and a carrier color signal, and more particularly to a YC separation circuit that uses a comb filter.
- NTSC luminance signal
- C signal carrier color signal
- a comb filter using a line delay and a frame delay is generally used.
- the comb filter uses the ratio of the color subcarrier frequency, horizontal frequency, and vertical frequency of the video signal to separate the Y and C signals from the composite video signal.
- the color subcarrier frequency is 227.5 times the horizontal frequency, so the color subcarrier phase is shifted 180 degrees compared to the previous line (a point just before one horizontal period). Will be. Therefore, in an image that does not change in the vertical direction, the amplitude of the Y signal is the same as that of the previous line, whereas the amplitude of the C signal is reversed from that of the previous line.
- the Y signal can be obtained by dividing the sum of the composite video signal without delay and the composite video signal delayed by one line by 2, and the C signal can be obtained by dividing the difference by 2.
- a comb filter using a line delay is referred to as a line comb filter.
- line comb filters There are various types of line comb filters other than those that simply add or subtract 1-line delayed signals (see, for example, Patent Document 1).
- the color subcarrier frequency is 59718.75 times the vertical frequency, so the color subcarrier phase is still compared to 2 fields before (at the time just 2 cycles before the vertical period). Is shifted 180 degrees. Therefore, there is no movement in the time direction.
- Y signal and C signal can be separated by the same operation as the line comb filter using composite video signal without delay and composite video signal delayed by 2 fields. Since two fields correspond to one frame, a comb filter that uses frame delay is sometimes called a frame comb filter.
- delays that are sufficiently larger than one-line delays including odd field delays are collectively referred to as frame delays, and comb filters that use such frame delays are referred to as frame comb filters.
- a YC separation circuit that uses a frame comb filter generally uses a motion detection circuit that detects temporal changes in the video signal using a frame-delayed video signal. The more the movement is detected, the less the frame comb filter works. Examples of frame comb filters and motion detection circuits include those described in Patent Document 2 as conventional examples.
- the color subcarrier phase is shifted 180 degrees approximately every two lines, and the color subcarrier phase is shifted 180 degrees also every two frames.
- YC separation can be performed using a comb filter (for example, Patent Document 3).
- a comb filter is generally not used.
- a line comb filter and a frame comb filter are used for YC separation. It is possible to apply.
- the frequency of the sampling clock is often set to an integer multiple of the color subcarrier frequency. For example, in the NTSC system, if the sampling frequency is set to four times the color subcarrier frequency, sampling points where the color phase IJ carrier phase is shifted 180 degrees every 910 clocks and every 477750 clocks can be obtained.
- a clock that is phase-synchronized with the color subcarrier is called a burst lock clock.
- sampling clock that is not necessarily phase-synchronized with the color subcarrier.
- the sampling clock is not a bus-lock clock, there is no correlation between the sampling interval and the color subcarrier period, so there is a sampling point corresponding to exactly one line before or one frame before a certain sampling point. It may not exist.
- the sampling frequency is higher by lOOppm than the color subcarrier frequency four times.
- one line delay is equivalent to 909.909 clock delay, and the video signal exactly one line before a certain sampling point exists between the sampling points before 909 clock and 910 clock.
- one frame delay corresponds to 477702.225 clock delay, and the video signal exactly one frame before a certain sampling point exists between 477 702 clocks and 477703 clocks before. If the sampling clock is not a burst-locked clock in this way, some ingenuity is required to obtain a video signal with exactly one line delay and one frame delay.
- Patent Document 4 is an example of a video signal processing apparatus that performs YC separation using a sampling clock having a fixed frequency.
- a composite video signal is sampled with a 27 MHz clock, and then the sampling rate is converted to a frequency that is four times the color subcarrier frequency. Since the converted video signal is equivalent to the video signal sampled with the burst lock clock, this video signal is delayed by one line or one frame to obtain the video signal exactly one line or one frame before. be able to.
- Patent Document 5 shows an example of a video signal processing apparatus that performs YC separation without changing the sampling rate.
- the distortion of the video signal accompanying the sampling rate conversion is reduced.
- the video signal is delayed by approximately one frame in units of a fixed frequency sampling clock, and the delayed video signal is further passed through an interpolation filter to generate a video signal between two sampling points.
- the video signal one frame before the point is obtained.
- the same is true when implementing a two-frame delay.
- a video signal two frames before can be accurately obtained.
- Patent Document 1 Japanese Patent No. 3299810 (Page 25_29, Fig. 1)
- Patent Document 2 Japanese Patent No. 3464291 (Pages 4-5, Fig. 16)
- Patent Document 3 US Pat. No. 4,833,526 (pages 5-7, Fig. 1)
- Patent Document 4 Japanese Patent Laid-Open No. 2002-315018 (Pages 4-7, Fig. 1)
- Patent Document 5 Japanese Unexamined Patent Application Publication No. 2004-007247 (Pages 4-9, Fig. 1)
- Patent Document 5 it is assumed that only two types of video signals, that is, a 1-frame delay and a 2-frame delay, are obtained.
- the line comb filter it is necessary to obtain a video signal with an accurate line delay, and this means is not shown.
- the input of the frame comb filter may use a frame delayed video signal further delayed by one line or more. In this case as well, a means for obtaining an accurately delayed video signal is shown. Nare ,. If the concept of Patent Document 5 is expanded and interpolation filters are prepared for the types of video signal delays, the number of interpolation filters increases and the circuit scale increases.
- non-standard signals such as VTR playback signals whose ratios of color subcarrier frequency, horizontal frequency, and vertical frequency do not conform to the NTSC, PAL, and SECAM standards are present in video signals.
- VTR playback signals whose ratios of color subcarrier frequency, horizontal frequency, and vertical frequency do not conform to the NTSC, PAL, and SECAM standards are present in video signals.
- the NTSC system the case where the color subcarrier frequency is deviated from 227.5 times the horizontal frequency is a non-standard signal. In such a case, it is difficult to correctly perform YC separation using the frame comb filter, so it is necessary to detect the non-standard signal and stop the operation of the frame comb filter. 5 does not show any means for performing non-standard signal detection.
- the present invention has been made to solve the above-described problems.
- the present invention has a small circuit scale. The purpose is to obtain a video signal with a line delay and a frame delay accurately, and to obtain a non-standard signal detection circuit with few additional circuits. Means for solving the problem
- Color subcarrier phase detection means for detecting a value corresponding to the instantaneous phase of the color subcarrier used to generate the carrier color signal
- a reference point generating means for generating a reference point of the color subcarrier phase for each predetermined period based on the detection result of the color subcarrier phase detecting means;
- Phase difference detection means for detecting a phase difference between the reference point generated by the reference point generation means and the clock signal in units of less than one clock period
- Delay means for delaying the video signal of each sampling point based on the phase difference detected by the phase difference detection means
- Sampling phase detection means for detecting the sampling phase of the video signal delayed by the delay means based on the detection result of the color subcarrier phase detection means
- Storage means for storing the video signal delayed by the delay means
- the memory control means for controlling the writing and reading of the video signal to and from the storage means, and at least the video signal read from the storage means is used.
- YC separation means to generate luminance signal and carrier color signal
- the delay means for delaying the video signal based on the phase difference between the reference point of the color subcarrier phase and the clock signal is arranged in the preceding stage of the storage means, so that it is not necessarily synchronized with the color subcarrier wave. Even when a non-performing clock is used, it is possible to obtain a video signal with line delay and frame delay accurately from the storage means, and YC separation can be performed with high accuracy using a line comb filter and a frame comb filter. effective.
- FIG. 1 is a block diagram showing an overall configuration of a video signal processing apparatus according to Embodiment 1 of the present invention.
- FIG. 2 is a block diagram showing an internal configuration of DPLL3 used in Embodiment 1 of the present invention.
- FIG. 3 shows an internal configuration of a timing generation circuit 4 used in Embodiment 1 of the present invention. It is a block diagram.
- FIG. 4 A waveform diagram showing signal waveforms generated by the timing generation circuit 4.
- FIG. 5 is a diagram showing the operation of the video signal processing apparatus according to the first embodiment of the present invention when the sampling clock frequency is equal to 1716 times the horizontal frequency.
- FIG. 6 is a diagram showing the operation of the video signal processing apparatus according to the first embodiment of the present invention when the sampling clock frequency is not equal to 1716 times the horizontal frequency.
- FIG. 7] is a block diagram showing the internal configuration of the timing generation circuit 4 used in Embodiment 2 of the present invention.
- FIG. 8 is a block diagram showing an internal configuration of the shift register 35 in the timing generation circuit 4 of FIG.
- FIG. 9 is a block diagram showing an operation of shift register 35 used in the second embodiment of the present invention.
- FIG. 10 A diagram showing an operation of the video signal processing apparatus according to the second embodiment of the present invention.
- FIG. 11 is a block diagram showing an overall configuration of a video signal processing apparatus according to Embodiment 3 of the present invention.
- FIG. 12 is a block diagram showing the internal configuration of the non-standard signal detection circuit 37.
- FIG. 13 is a block diagram showing the internal configuration of the first non-standard signal detection circuit 44.
- FIG. 14 A block diagram showing an overall configuration of a video signal processing apparatus according to Embodiment 4 of the present invention.
- FIG. 15 A diagram showing an operation of the video signal processing apparatus according to the fourth embodiment of the present invention when a standard signal is input.
- FIG. 16 A diagram showing an operation of the video signal processing apparatus according to the fourth embodiment of the present invention when a standard signal is input.
- FIG. 17 A diagram showing an operation of the video signal processing apparatus according to the fourth embodiment of the present invention when a non-standard signal is input.
- FIG. 18 is a diagram showing an operation of the video signal processing device according to the fourth embodiment of the present invention when a non-standard signal is input.
- FIG. 1 is a diagram showing a configuration of a video signal processing apparatus according to Embodiment 1 of the present invention.
- the illustrated video signal processing circuit receives a digital composite video signal supplied to the input terminal 1 and processes the digital composite video signal.
- DPLL digital nose PLL
- timing generation circuit 4 timing generation circuit 4
- delay filter 5 frame memory controller 6
- first to third frame memories 7, 8, 9, line memory controller 10 first to sixth Line memories 11 to 16
- YC separation circuit 17 a digital nose PLL
- a digital composite video signal is input from input terminal 1.
- This digital composite video signal is obtained by sampling an analog composite video signal at a predetermined sampling frequency.
- This sampling frequency is shown in Figure 1. It is synchronized with the frequency of the clock used for the operation of the circuits.
- the sync separation circuit 2 separates the horizontal sync signal and the vertical sync signal from the video signal input from the input terminal 1.
- DPLL3 is a signal that indicates the reference of the color subcarrier phase superimposed in the horizontal blanking interval of the video signal using the video signal input from input terminal 1 and the horizontal sync signal separated by sync separator circuit 2. And the instantaneous phase of the color subcarrier at each sampling point is detected.
- the color burst signal is a signal indicating the color subcarrier phase reference
- the unmodulated color subcarrier signal is the signal indicating the color subcarrier phase reference.
- the internal configuration of DPLL3 will be described later.
- the timing generation circuit 4 sets a reference point for the color subcarrier phase at a predetermined period based on the instantaneous phase of the color subcarrier detected by the DPLL 3, and sets the reference point for the set color subcarrier phase.
- the phase difference from the sampling clock is detected in units of less than one period of the sampling clock, and at the same time, the sampling phase at each sampling point is detected based on the instantaneous phase of the color subcarrier detected by DPLL3.
- timing generation circuit 4 Details of the timing generation circuit 4 will be described later.
- the delay filter 5 is used as a delay means for delaying the video signal based on the phase difference between the reference point of the color subcarrier phase detected by the timing generation circuit 4 and the sampling clock.
- the frame memory controller 6 Based on the sampling phase of each sampling point detected by the timing generation circuit 4, the frame memory controller 6 transmits video signals to the first frame memory 7, the second frame memory 8, and the third frame memory 9. Controls writing and reading.
- the frame memory controller 6 writes the video signal delayed by the delay filter 5 into one of the first frame memory 7, the second frame memory 8, and the third frame memory 9. Video signals are read from the remaining two frame memories that have not been written. If the frame memory to be written for each frame is switched, video signals with 1-frame delay and 2-frame delay can be read from the two frame memories without writing. The 1-frame delay and 2-frame delay video signals read from the frame memory are stored in the frame memory controller. 6 is output to the line memory controller 10 via 6.
- the line memory controller 10 includes a first line memory 11, a second line memory memory 12, a third line memory 13, and a fourth line memory based on the sampling phase of each sampling point detected by the timing generation circuit 4.
- the video signal writing / reading control for the line memory memory 14, the fifth line memory 15 and the sixth line memory memory 16 is controlled.
- a video signal delayed by the delay filter 5 is written into the first line memory 11, the second line memory 12, and the third line memory 13 via the line memory controller 9.
- the fourth line memory 14 the fifth line memory 15, and the sixth line memory 16, a one-frame delayed video signal output from the frame memory controller 6 is written.
- the line memory controller 10 uses the three line memories of the first line memory 11, the second line memory 12, and the third line memory 13 to control one line by the same control as the frame memory controller 6 described above.
- a delayed video signal and a two-line delayed video signal are obtained.
- a video signal obtained by further delaying a one-frame delayed video signal by one line using the three line memories of the fourth line memory 14, the fifth line memory 15, and the sixth line memory 16 (hereinafter referred to as the “line signal”).
- Write “1 frame + 1 line delayed video signal”) and 2 line delayed video signal hereinafter “1 frame + 2 line delayed video signal”.
- the 2-frame delayed video signal output from the frame memory controller 6 is output to the YC separation circuit 16 via the line memory controller 9.
- Video signal output from line memory controller 9 to YC separation circuit 16 is 0 line delay, 1 line delay, 2 line delay, 1 frame delay, 1 frame + 1 line delay, 1 frame + 2 line delay, 2 frame delay
- the YC separation circuit 16 generates a Y signal and a C signal using these seven types of video signals, and outputs them from the output terminal 17 and the output terminal 18, respectively.
- the burst gate 22 is a color bar superimposed on the horizontal blanking period of the video signal input from the input terminal 20 based on the horizontal synchronizing signal input from the input terminal 21. Separates the signal (or unmodulated color subcarrier signal).
- the phase comparator 23 detects a phase error between the output signal of the burst gate 22 and the sine wave output from the sine wave ROM 26, and outputs it to the loop filter 24.
- the loop filter 24 smoothes the phase error detected by the phase comparator 23 and generates a control value for the phase accumulator 25.
- Phase accumulator 25 adds the constant value corresponding to the free-running oscillation frequency of DPLL3 to the control value generated by loop filter 24 and adds it every clock to obtain a phase value from 0 to 360 degrees. Is generated.
- phase value that is the output of the phase accumulator 25 is 250 degrees at a certain time. If the control value, which is the output of the loop filter 24, is constant at 1 degree and the constant value added by the phase accumulator 25 is 45 degrees, the output of the phase accumulator 25 after 1 clock is 296 degrees. 342 degrees after 2 clocks, 28 degrees after 3 clocks, 74 degrees after 4 clocks, etc.
- the phase value output from the phase accumulator 25 is output to the sine wave ROM 26 and the output terminal 27.
- the sine wave ROM26 is a circuit that outputs sin (w) for the input value w.
- the phase value output from the output terminal 27 is a value corresponding to the instantaneous phase of the color subcarrier.
- the phase error detected by the phase comparator 23 is constantly 0, the color burst signal (or unmodulated color subcarrier signal) and the sine wave oscillation generated by the sine wave ROM 26 are in phase synchronization. Conceivable. Therefore, at this time, the phase value input to the sine wave ROM 26 is considered to be equal to the instantaneous phase of the color burst signal or the unmodulated color subcarrier signal. Since the color burst signal is a signal indicating the reference phase of the color subcarrier signal, the phase value output from the output terminal 27 is also considered to be a value corresponding to the color subcarrier phase.
- phase value output from the output terminal 27 may have a constant phase error with respect to the color subcarrier phase, but in practice this phase error is not a problem for the operation of the circuit. Therefore, in the following, the phase value output from the output terminal 27 is treated as the instantaneous phase of the color subcarrier itself.
- color subcarrier phase detection means for detecting the value (Fig. 4 (b)) corresponding to the instantaneous phase of the color subcarrier used to generate the DPLL3 force carrier color signal (C) is configured. ing.
- the phase of the color burst signal is not constant, unlike the NTSC system, but changes by +90 degrees or -90 degrees alternately for each line. Therefore, in the PAL method, the phase error detected by the phase comparator 23 alternates between +45 degrees and ⁇ 45 degrees for each line, and the color burst signal and the sine wave oscillation generated by the sine wave ROM 26 are in phase. If you think that you are in sync,
- timing generation circuit 4 will be described with reference to FIG.
- the instantaneous phase of the color subcarrier detected by DPLL 3 is input to the phase difference detection circuit 29, the reference point generation circuit 30, and the first counter 31 via the input terminal 28.
- the reference point generation circuit 30 generates a reference point for the color subcarrier phase at a predetermined cycle (almost constant cycle) based on the instantaneous phase of the color subcarrier (the detection result of the color subcarrier phase detection means (3)). Or used as reference point generation means for setting.
- the reference point generation circuit 30 outputs a timing pulse to the first counter 31 and the phase difference detection circuit 29 each time a new reference point is set.
- the first counter 31 receives the sampling clock at the count input terminal C, counts up by 1 every clock, receives the timing pulse from the reference point generation circuit 30 at the reset input terminal scale, and outputs the timing pulse every time the timing pulse is output. This circuit resets the count value. The count value in the first counter 31 is output from the output terminal Q.
- the phase difference detection circuit 29 is a delay filter based on the phase difference between the color subcarrier phase when the timing pulse is output and the color subcarrier phase at the sampling point that appears at the same time as the reference point or immediately after the reference point. This circuit calculates the delay amount of the video signal used in step 5. As will be understood later, the phase difference detection circuit 29 detects the phase difference between the reference point generated by the reference point generation circuit 3 and the sampling clock signal in units of less than one clock period. The delay amount calculated by the phase difference detection circuit 29 is output to the delay filter 5 via the output terminal 32.
- the count value of the first counter 31 is output to the line memory controller 10 and the frame memory controller 6 via the output terminal 33. In the line memory controller 10 and the frame memory controller 6, the count value of the first counter 31 is used as a value indicating the sampling phase of the video signal.
- the first counter 31 Based on the instantaneous phase of the color subcarrier detected by DPLL3 (detection result of color subcarrier phase detection means (3)), the first counter 31 outputs the video signal delayed by the delay filter 5. It is used as means for detecting the sampling phase (sampling phase detection means).
- the sampling clock frequency is written as fs
- the color subcarrier frequency is written as fsc
- the horizontal frequency is written as fh
- the vertical frequency is written as fv.
- the instantaneous phase of the color subcarrier at the reference point is assumed to be either 0 degrees or 180 degrees. Under this condition, even if fs is slightly deviated from 27 MHz or fsc is slightly deviated from the standard value of NTSC system, as long as fs 8 X fsc holds, 1712 clocks or more from the previously set reference point 1720 A new reference point can always be set while less than a clock has elapsed. Since the point at which the instantaneous phase of the color subcarrier is 0 or 180 degrees does not always coincide with the sampling point, the reference point usually exists between the two sampling points.
- FIG. Figure 4 (a) shows the sun Figure 4 (b) is the data representing the instantaneous phase of the color subcarrier input from the input terminal 28, Figure 4 (c) is the most significant bit of the data representing the instantaneous phase, and Figure 4 (d) is the first bit. 1 count value of counter 31, Fig. 4 (e) is the value of the lower 11 bits (T) of the count value, Fig. 4 (f) is the most significant bit (B) of the count value, Fig. 4 (g) Is the delay amount of the video signal calculated by the phase difference detection circuit 29, and FIG. 4 (h) shows the timing pulse output from the reference point generation circuit 30.
- the instantaneous phase of the color subcarrier input from the input terminal 28 is represented by 10 bits, and the 10-bit value 512 is converted into a phase and corresponds to 180 degrees.
- the value of the lower 11 bits of the count value of the first counter 31 is 1712 or more, and the value of the most significant bit of the instantaneous phase of the color subcarrier input from the input terminal 28 is changed.
- the timing error is output when This corresponds to the timing when the reference point is set.
- the first counter 31 is a 12-bit counter that increments by 1 every clock and resets the count value every time the reference point generation circuit 30 generates a timing pulse.
- the reset value is 2048 when the count value when the timing pulse is generated is less than 2048, and 0 when it is greater than 2048.
- the phase difference detection circuit 29 multiplies the value of the lower 9 bits of the instantaneous phase of the color subcarrier when the timing pulse is output by a value equivalent to (fs ⁇ fsc), and further divides the value by 16 as a delay filter.
- the delay amount used in 5 is output via output terminal 32.
- the instantaneous phase of the color subcarrier is always increased by 136 every clock. This corresponds to a case where the color subcarrier frequency is 136/1024 times the sampling clock frequency, ie, 3.5859375 MHz. Furthermore, in the initial state, the instantaneous phase of the color subcarrier is 0, and at this time, the first reference point is set. At this time, the count value of the first counter 31 is 3761.
- the count value of the first counter 31 is reset to 0 by a timing pulse one clock after the first reference point is set, and then 1712 after 1 712 clocks. Become. At this time, the instantaneous phase of the color subcarrier is 520, and the most significant bit of the instantaneous phase of the color subcarrier represented by 10 bits changes from 0 to 1. Therefore, the reference point generation circuit 30 generates a timing pulse when the count value reaches 1712. In this way, the count value of the first counter 31 is 17 Detected between 11 and 1712.
- the count value of the first counter 31 is reset to 2048 in response to the timing pulse.
- the delay filter 5 detects the video signal at each sampling point from when the second reference point is detected until the third reference point is detected. Is delayed by 3/64 clocks.
- the delay filter is a kind of interpolation filter and can be thought of as a filter that creates video signals between clocks by interpolation. In general, sampling functions and higher-order polynomials can be used for accurate interpolation, but linear interpolation can also be used.
- the count value of the first counter 31 becomes 3760 1717 clocks after the generation of the timing pulse indicating that the second reference point has been detected, and the instantaneous phase of the color subcarrier is 16. Become. At this time, the lower 11 bits of the count value is 1712, and the most significant bit of the instantaneous phase of the color subcarrier changes from 1 to 0.
- the reference point generation circuit 30 is the third reference point. A timing pulse is generated to indicate that has been detected. The third reference point is between the time when the count value of the first counter 31 is 3759 and 3760, and the phase difference from the sampling clock that appears immediately after that is converted into a 10-bit color subcarrier phase. And becomes 16.
- the amount of delay at this time is 7/64 clocks converted to the sampling clock cycle by the calculation method described above.
- the delay filter 5 delays the video signal at each sampling point by 7 clocks of 64 minutes from when the third reference point is detected until the fourth reference point is detected.
- the first counter at the next clock that generated the timing pulse The count value of 31 is reset to 0.
- Figures 5 and 6 are two-dimensional representations of the sampling points arranged in a time series using the X and Y coordinates.
- the X coordinate takes an integer value between 0 and 1715
- the Y coordinate takes an integer value greater than or equal to 0.
- Each sampling point after the delay corresponds to a grid point in the figure and can be identified by the X and Y coordinates.
- Corresponds to the sampling point (when (x + y X 1716) clocks have elapsed from the sampling point at (X, Y) (0, 0)).
- the number on the upper right of each grid point is the count value of the first counter 31 and is a value indicating the sampling phase of the video signal delayed by the delay filter 5.
- the value of the most significant bit of the sampling phase which is a 12-bit value, is shown in parentheses, and the remaining lower 11 bits are shown on the left side of the most significant bit.
- the most significant bit of the sampling phase is called the reference phase and is represented by the symbol B.
- the lower 11 bits of the sampling phase are called the phase offset and are represented by the symbol T.
- the symbol D n at the lower right of each grid point indicates the amount of delay used by delay filter 5 after the nth reference point is detected and the (n + 1) th reference point is detected. .
- the white circle is the actual sampling point (sampling point before delay), and the arrow from the white circle is the sampling point where the video signal that was at the position of the white circle by the delay filter 5 is at the tip of the arrow.
- the delay filter 5 delays or interpolates the sampling value of the video signal at the position of the white circle (and the instantaneous value of the video signal at the sampling point at the end of the arrow based on the sampling value in the vicinity thereof).
- the instantaneous value of the video signal obtained by delay or interpolation is also called a sample value, and the point at which this sample value is found is called a sampling point.
- the sampling phase, delay amount, etc. are omitted at some grid points.
- the reference point is shifted by one clock, and the counter is immediately after detecting the reference point (during the same clock period after one clock period).
- Value S It is described to be reset. There is a one-clock delay from the detection of the reference point until the delay amount used by delay filter 5 is calculated, but in the following figure, the delay amount is calculated immediately after the reference point is detected for the same reason. It is described as being calculated.
- the phases will be 180 degrees different from each other. Therefore, if the line memory controller 10 uses the value of T as the read / write address for the line memory and controls to switch the line memory to be read / written whenever the value of B changes, the YC separation circuit 17 1 line delay and 2 line delay video signals used in
- the line memory controller 10 further delays the one-frame delayed video signal output from the frame memory controller 6 by one line and two lines.
- the frame memory controller 6 is outputting a video signal with one frame delay in which the color subcarrier phase is correctly shifted by 180 degrees.
- video signals having the same T and different only B at any (X, Y) are obtained and reproduced.
- the arrangement of the video signal with one frame delay corresponds to the case where the value of B in FIG.
- the operation of the frame memory controller 6 with respect to the first frame memory 7, the fifth frame memory 8, and the sixth frame memory 9 is substantially the same as the operation of the line memory controller 10.
- the video signals delayed by the delay filter 5 between the nth reference point and the (n + 1) th reference point ((n mod 525) X 1716 + T) is read into the three frame memories. If it is controlled to switch the frame memory to be used for 'write address and read / write every time the reference point is detected 525 times, a video signal with 1 frame delay and a video signal with 2 frame delay can be obtained.
- the color subcarrier phases at two sampling points having the same T value are either equal to each other or different from each other by 180 degrees. This is exactly the same as in the case of FIG. 5, and the video signal of the line delay and frame delay used in the YC separation circuit 17 is obtained by the read / write control of the line memory and the frame memory as described above.
- the video signal processing device As described above, in the video signal processing device according to the first embodiment, only one delay filter is used, and 0 line delay, 1 line delay, 2 line delay, 1 frame delay, 1 frame used in the YC separation circuit 13 It is possible to generate a total of seven types of video signals: + 1 line delay, 1 frame + 2 line delay, and 2 frame delay. Even if the line delay and frame delay data further increase, only one delay filter is required. It can be seen that even when a video signal with a field delay (for example, 262 line delay) is required, a field delay video signal can be obtained in a similar manner if the frame memory is replaced with a field memory.
- a field delay for example, 262 line delay
- the power PAL system described only for the NTSC system can be handled with the same configuration.
- fsc (1135 ⁇ 4 + 1 ⁇ 625)
- fs 1728 X fh .
- the color subcarrier phase shifts by 180 degrees approximately every two lines.
- the PAL-I method YC separation is performed in exactly the same way. A video signal with a line delay and a frame delay is used.
- the second embodiment is an example having a timing generation circuit 4 having an internal configuration different from that of the first embodiment.
- FIG. 7 is a diagram showing a configuration of the timing generation circuit 4 according to the second embodiment of the present invention.
- the timing generation circuit of FIG. 7 differs in that a force shift register 35 and a second counter 36 that are generally the same as those shown in FIG. 3 are added.
- the first counter 31 is the same as the counter 31 of FIG. 3, but its output terminal Q is connected to the shift register 35 (not the output terminal 33 as in FIG. 3).
- the phase detection circuit 29 is also connected to a shift register 35 whose force is the same as the phase detection circuit 29 of FIG. 3 and whose output force S (not the output terminal 32).
- the reference point generation circuit 30 has the same force as that of the reference point generation circuit 30 in FIG.
- the shift register 35 includes five-stage registers 35a to 35e and registers 35a to 35e.
- the subtracting circuit receives the lower 11 bits of the count value of the first counter 31, subtracts the lower 11 bits of the count value of the first counter 31 from “1716”, and outputs the subtraction result.
- the first-stage register 35a receives the output (Sn) of the subtraction circuit 35 and the output (delay amount Dn) of the phase difference detection circuit 29.
- the second to fifth stage registers 35b to 35e receive the outputs of the first to fourth stage registers 35a to 35d, respectively.
- the first to fifth stage registers 35 a to 35 e perform a shift operation according to the timing pulse output from the reference point generation circuit 30.
- the timing pulse output from the reference point generation circuit 30 is supplied to the selection circuit 35f together with the horizontal synchronization signal input from the input terminal 34.
- the shift register 35 outputs a 6-bit delay output from the phase difference detection circuit 29 when a timing error indicating that the nth reference point is detected in the reference point generation circuit 30 is output.
- Quantity Dn and “1716” force
- the value obtained by subtracting the lower 11 bits of the count value of the first counter 31 (hereinafter referred to as “increment value” and written as Sn) is stored in the first-stage register 35a.
- the values stored in the first to fourth stage registers 35a to 35d are transferred to the registers 35b to 35f one stage behind.
- the selection circuit 35f first selects (in the initial state) the third-stage register 35c, and every time a timing pulse is output from the reference point generation circuit 30, it is one stage behind the previously selected register. Each time, the value stored in the selected register is read and output, and each time the reference edge of the horizontal sync signal input from the input terminal 34 is detected, the previous register is Reads and outputs the value stored in the selected register. If the timing error and the reference edge of the horizontal sync signal are detected at the same time, select the register at the same stage as previously selected, and read and output the value stored in the selected register. To do. When the timing pulse is generated, the value of each register is shifted backward by one stage. Therefore, even if the next register is read by the timing panel, the read value itself does not change.
- the delay amount Dn is output to the delay filter 5 via the output terminal 32, and the increment value Sn is output to the second counter 36.
- the second counter 36 is a 12-bit counter that receives a sampling clock at its count input terminal C and increments it by one for each clock. However, in the second counter 36, the next count value of 1715 is 2048, and the next count value of 3763 is 0.
- the second counter 36 receives the increment value Sn output from the shift register 35 at its addition input terminal A, receives the horizontal synchronization signal at the control input terminal B, and detects the reference edge of the horizontal synchronization signal. Each time, the increment value Sn output from the shift register 35 is added to the current count value.
- the increment value Sn is a negative value
- the count value of the second counter 36 is output from its output terminal Q, and is output to the frame memory controller 6 and the line memory controller 10 via the output terminal 33 of the timing generation circuit 4.
- the count value of the second counter 36 indicates the sampling phase of the video signal delayed by the delay finisher 5.
- the first to fifth stage registers 35a to 35e are used as phase difference holding means for holding the phase differences detected by the phase difference detection circuit 29 in time series, and the selection circuit 35f At a predetermined timing outside the effective video period, for example, it is used as a phase difference selection means for updating the phase difference read from the phase difference holding means (35a to 35e) at the reference edge of the horizontal synchronizing signal.
- timing generation circuit 4 By configuring the timing generation circuit 4 as described above, accurate YC separation can be performed even for non-standard signals where the relationship between fsc, fh, and fv is not as specified. This will be explained below.
- the point where the count value of the second counter 36 representing the sampling phase becomes discontinuous becomes the reference edge of the horizontal synchronizing signal, so that the line comb always remains in the effective video period.
- a filter can be used.
- FIG. 9 shows the coordinates of the sampling point appearing on or immediately after the straight line, the values of the increment value Sn and the delay amount Dn detected at that time, and the values stored in each stage of the shift register 35. And the register stage that is the output of the shift register 35. However, for the values Sn and Dn stored in each stage of the shift register 35, the value of n was substituted to avoid complication. Also, the register stage where the value is not yet stored is left blank.
- FIG. 10 shows the values of T and ⁇ ⁇ ⁇ ⁇ at each sampling point, as well as FIGS. 5 and 6 of the first embodiment, and also uses the delay filter 5 to generate a video signal at each sampling point.
- the value of Dn obtained is shown.
- the values of T and ⁇ are the sampling phases generated by the second counter 36, and the value of Dn is the value output by the shift register 35.
- the operation of the timing generation circuit 4 in FIG. 7 will be described with reference to FIGS. 9 and 10.
- the value of the lower 11 bits of the first counter 31 is simply written as the count value of the first counter 31 here.
- sampling phase T, T, the increment value Sn, and the delay amount Dn can be similarly determined for the fifth and subsequent reference points and the reference edge of the horizontal synchronization signal.
- the point where the delay amount Dn is updated and the point where the sampling phase changes discontinuously by the increment value Sn are used as the position of the reference edge of the horizontal synchronization signal.
- the line comb filter can always be used during the effective video period.
- the delay amount Dn is updated and the increment value Sn changes at the reference edge of the horizontal synchronization signal.
- the timing generated by appropriately delaying the horizontal synchronization signal is used.
- a ring pulse may be used. That is, the delay amount Dn (that is, the phase difference) may be updated and the increment value Sn may be changed at a position other than the reference edge of the horizontal synchronization signal.
- the force S, PAL method, and SECA M method described for the NTSC method are used only once every two lines, and the delay amount Dn and increment value Sn at the reference edge of the horizontal synchronization signal. May be updated.
- the number of stages of the shift register 35 is five.
- Embodiment 3 is an example in which a non-standard signal detection means for detecting a non-standard signal as shown in FIG. 10 is provided.
- FIG. 11 is a diagram showing a configuration of a video signal processing apparatus according to Embodiment 3 of the present invention.
- the timing generation circuit 4 may be the same as the timing generation circuit 4 of FIG. 3 described in the first embodiment or the same as the timing generation circuit 4 of FIG. 7 described in the second embodiment.
- the difference from Embodiments 1 and 2 is that a non-standard signal detection circuit 37 is provided.
- the frame memory controller 38 performs an operation different from that of the frame memory controller 6 of the first and second embodiments for detecting the non-standard signal.
- the non-standard signal detection circuit 37 includes a horizontal synchronization signal and a vertical synchronization signal output from the synchronization separation circuit 2, a sampling phase detected by the timing generation circuit 4, and a one-frame delay output from the frame memory controller 6. And the non-standard signal is detected using the data of 2 frame delay, and the detection result is output to the YC separation circuit 17.
- the YC separation circuit 17 generates a luminance signal and a carrier color signal according to the detection result of the non-standard signal detection circuit 37. change. For example, when a non-standard signal is detected by the non-standard signal detection circuit 37, the YC separation circuit 17 stops the operation of the frame comb filter and separates the Y signal and the C signal using a filter other than the frame comb filter. To do.
- the frame memory controller 38 obtains position information on the display screen of each sampling point from the non-standard signal detection circuit 37 and the first frame memory 7 and the second frame together with the video signal delayed by the delay filter 5. To frame memory 8 and third frame memory 9.
- FIG. 12 is a diagram showing an internal configuration of the non-standard signal detection circuit 37 according to the third embodiment of the present invention.
- the horizontal synchronization signal separated by the synchronization separation circuit 2 is supplied to a horizontal counter 42, a vertical counter 43, and a first non-standard signal detection circuit 44 via an input terminal 39, respectively.
- the vertical synchronization signal separated by the synchronization separation circuit 2 is supplied to the vertical counter 43 and the first non-standard signal detection circuit 44 via the input terminal 40, respectively.
- the sampling phase detected by the timing generation circuit 4 is supplied to the first nonstandard signal detection circuit 44 via the input terminal 41.
- the first non-standard signal detection circuit 44 includes an inversion detection circuit 44a, a vertical synchronization signal counter 44b, an up / down counter 44c, and a determination circuit 44d.
- 44a receives the most significant bit B of the sampling phase output from the timing generation circuit 4, and outputs a pulse (inversion detection node) every time it is inverted.
- the vertical sync signal counter 44b receives the vertical sync signal output from the sync separation circuit 2 at its count input terminal C, counts the reference edge of the vertical sync signal, and when the count value becomes 16 (that is, the vertical sync signal) When the reference edge of the signal is detected 16 times), a detection error is output.
- the up / down counter 44c receives the horizontal sync signal output from the sync separation circuit 2 at its up count input terminal U, and increments the count by 1 every time the reference edge is detected, and the pulse output from the inversion detection circuit 44a. (Inverted detection pulse) is received at the downcount input terminal D, and every time this node is input, it is decremented by 1 and the detection pulse output from the vertical sync signal counter 44b is received at the reset input terminal R, When you receive a less, the count value is reset to 0.
- the count value of up / down counter 44c is its output terminal Q is output from Q and input to determination circuit 44d.
- the half IJ constant circuit 44d determines that a non-standard signal has been detected when the count value of the up / down counter 44c is 2 or more, or 1 or 2 and outputs the determination result.
- the output of the determination circuit 44d is output to the YC separation circuit 17 via the output terminal 47 as a detection result (first nonstandard signal detection result) by the first nonstandard signal detection circuit 44.
- the horizontal counter 42 receives the sampling clock at its count input terminal C, counts up by 1 every clock, receives the horizontal synchronization signal at its reset input terminal R, and receives the reference edge of the horizontal synchronization signal. Reset the count value to 0 each time. 7
- the count value of the flat counter 42 corresponds to the horizontal display position on the display screen.
- the count value of the horizontal counter 42 is output from its output terminal Q, and is output to the frame memory controller 38 via the output terminal 45 of the non-standard signal detection circuit 37.
- the vertical counter 43 receives the horizontal synchronization signal at its count input terminal C, increments by 1 each time the reference edge of the horizontal synchronization signal is input, receives the vertical synchronization signal at its reset input terminal R, and receives the vertical synchronization signal.
- the count value is reset to 0 each time a reference edge is input.
- the count value of the vertical counter 43 is a value corresponding to the vertical display position on the display screen.
- the count value of the vertical counter 43 is output from its output terminal Q, and is also output to the frame memory controller 38 via the output terminal 46 of the non-standard signal detection circuit 37.
- the valid video period generation circuit 48 generates a 1-bit signal indicating the horizontal blanking period based on the value of the horizontal counter 42, and outputs it to the frame memory controller 38 via the output terminal 49. Further, a 1-bit signal indicating an effective video period is generated based on the value of the horizontal counter 42 and is output to the second non-standard signal detection circuit 52. It is assumed that the horizontal blanking period and the effective video period set by the effective video period generation circuit 48 are periods that do not overlap each other, and the horizontal blanking period is a part or all of the period other than the effective video period.
- the horizontal counter 42 and the effective video period generation circuit 48 constitute position information generation means for outputting a binary signal representing the effective video period as position information, and the horizontal force counter 42 And a vertical counter 43, a position information generating method for outputting, as position information, a multi-value signal representing the position on the display screen generated based on the horizontal synchronizing signal and the vertical synchronizing signal.
- the position information generating means configured by the combination of the horizontal counter 42 and the effective video period generating circuit 48, and the position information generating means configured by the combination of the horizontal counter 42 and the vertical counter 43, This is common in that the position information of each sampling point is generated based on at least the horizontal sync signal.
- the second non-standard signal detection circuit 52 receives the horizontal blanking period of the 1-frame delay video signal input from the input terminal 45 and the 2-frame delay video signal input from the input terminal 46. It is determined that a non-standard signal has been detected when the horizontal blanking interval overlaps the effective video period set by the effective video period generation circuit 48 in time, and this determination result is used as the second non-standard signal detection result. Is output to the YC separation circuit 17 via the output terminal 53.
- the horizontal blanking period of the video signal with 1 frame delay and the video signal with 2 frame delay is obtained by sending the information of the horizontal blanking period set by the effective video period generation circuit 48 via the frame memory controller 38 to the first. This is obtained by writing into the frame memory 7, the second frame memory 8, and the third frame memory 9.
- a 1-bit signal indicating the horizontal blanking interval can be written together with the video signal at each sampling point, or the horizontal blanking interval can be written.
- the value of the video signal in this period may be replaced with a unique value indicating the horizontal blanking erasing period.
- the third non-standard signal detection circuit 54 receives the horizontal and vertical display positions of the 1-frame delayed video signal input from the input terminal 45 and the 2-frame delayed video signal input from the input terminal 46. Horizontal / vertical display position force When the horizontal / vertical display position generated by the horizontal counter 42 and vertical counter 43 deviates from the horizontal / vertical display position by a certain value or more, it is determined that a non-standard signal has been detected, and the result of this determination is the third non-standard. The signal detection result is output to the YC separation circuit 17 via the output terminal 55.
- the horizontal and vertical display positions of the video signal with 1 frame delay and the video signal with 2 frame delay are obtained through the frame memory controller 6 by using the horizontal 'vertical display position' information generated by the horizontal counter 42 and the vertical counter 43 through This is obtained by writing to the first frame memory 7, the second frame memory 8, and the third frame memory 9.
- To write the horizontal / vertical display position information to these three frame memories write the signal indicating the horizontal / vertical display position together with the video signal at each sampling point. If the video signal in the horizontal blanking interval does not appear on the display screen, the value of the video signal during this period may be replaced with a value representing the horizontal and vertical display positions. good.
- the nonstandard signal detection circuit 37 has three nonstandard signal detection circuits.
- the YC separation circuit 17 is assumed to stop the operation of the frame comb filter when any one of the three nonstandard signal detection circuits detects a nonstandard signal.
- the three non-standard signal detection circuits can detect a non-standard signal in which fsc and fh are not in the relationship as specified.
- the straight line H indicating the reference edge of the horizontal synchronizing signal and the straight line P indicating the reference point of the color subcarrier phase are not parallel to each other. This means that the horizontal period and the period in which the reference point appears are different. Therefore, if the difference between the number of reference edges and the number of reference points in the horizontal synchronization signal within a certain period is not equal, the input signal can be said to be a non-standard signal.
- the count value of the up / down counter is 2 or more or 2 or less if either the reference point is detected more than once during one horizontal period, or the reference edge of the horizontal sync signal is detected more than once between the two reference points. is there. Therefore, it can be seen that the nonstandard signal can be detected by the count value of the up / down counter built in the first nonstandard signal detection circuit 44.
- the first non-standard signal detection circuit 44 determines the non-standard signal based on the difference between the predetermined period determined based on the horizontal synchronization signal and the period at which the reference point generation circuit 30 generates the reference point. A signal is detected.
- the second non-standard signal detection circuit 52 is configured to output the video signal within the effective video period from the delay filter 5 (expressed by the output of the effective video period generation circuit 48). Timing at which the video signal within the effective video period is read from the storage means (7-9, 11-: 19) (Detected from the 1-frame delayed video signal and 2-frame delayed video signal supplied via terminals 50 and 51) It can also be said that a non-standard signal is detected based on the time difference from the above.
- the third non-standard signal detection circuit 54 includes the position information of the video signal delayed by the delay filter 5 (represented by the outputs of the horizontal counter 42 and the vertical counter 43), and storage means.
- Non-standard signal based on the difference in position information (obtained from 1-frame delayed video signal and 2-frame delayed video signal supplied via terminals 50 and 51) read out from (7-9, 11-: 16) It can also be said that it is detected.
- the second non-standard signal detection circuit 52 and the third non-standard signal detection circuit 54 are provided with position information (the output of the horizontal counter 42 and the vertical counter 43, or the valid signal) associated with the video signal delayed by the delay filter 5.
- the non-standard signal is detected based on the comparison result between the output of the video period generation circuit 48) and the positional information associated with the video signal read from the storage means (7-9, 11-: 16). It is common.
- Embodiment 3 three different non-standard signal detection circuits are used, but any one of the three may be used, or any two may be used together.
- the effective video period generation circuit 48 outputs a signal indicating the horizontal blanking period to the frame memory controller 38, and the effective video period is output to the second non-standard signal detection circuit 52.
- a signal representing the effective video period may be output to the frame memory controller 38, and a signal representing the horizontal blanking period may be output to the second non-standard signal detection circuit 52.
- the third embodiment includes a non-standard signal detection circuit that detects a non-standard signal in which the values of the color subcarrier frequency, the horizontal frequency, and the vertical frequency do not have a predetermined ratio.
- the frame memory controller 6 determines the read / write address of the frame memory based on the sampling phase S, and in the fourth embodiment, the frame memory controller 6 determines the frame memory based on the horizontal synchronization signal and the vertical synchronization signal. An example of determining the read / write address is shown.
- FIG. 14 is a diagram showing a configuration of a video signal processing apparatus according to Embodiment 4 of the present invention.
- blocks with the same reference numerals as those in FIG. 1 are blocks having the same functions, and description thereof is omitted.
- SDRAM (synchronous DRAM) 59 is used as a frame memory. 1-frame delay and 2-frame delay data are stored in different storage areas in SDRAM 59.
- the write timing controller 56 sets an effective video period based on the horizontal synchronization signal and the vertical synchronization signal output from the synchronization separation circuit 2, and outputs a write enable signal that is enabled in the effective video period.
- Video delayed in delay filter 5 Output to SDRAM controller 58 together with signal. Furthermore, the value of the video signal for a part of the effective video period is replaced with the value of the sampling phase output from the timing generation circuit 4.
- the read timing controller 57 includes a horizontal synchronization signal and a vertical synchronization signal output from the synchronization separation circuit 2, a sampling phase detected by the timing generation circuit 4, and a 1-frame delayed video signal output from the SDRAM controller 58. Based on the sampling phase information contained in the 2-frame delay video signal, the first read-enable signal that reads the 1-frame delay video signal and the second read-enable signal that reads the 2-frame delay video signal are generated. Then, a 1-frame delayed video signal and a 2-frame delayed video signal are read from the SDRAM 59 via the SDRAM controller 58.
- the SDRAM controller 58 Based on the write enable signal output from the write timing controller 56, the SDRAM controller 58 writes the video signal (partially replaced with the sampling phase) existing in the effective video period to the SDRAM 59. Also, every time the first read enable signal power S output enabled from the read timing controller 57 enters the S enable state, the 1 frame delayed video signal is read out in the order in which it was written, and the second Each time the read enable signal is enabled, it reads out the 2 frames delayed video signals from the SDRAM 59 and outputs them to the read timing controller 57 respectively.
- the SDRAM 59 is used as a storage unit that stores the video signal delayed by the delay filter 5 and the sampling phase detected by the sampling phase detection unit (31).
- the write timing controller 56 and the SDRAM controller 58 are used as write control means for controlling the writing of the video signal and the sampling phase to the SDRAM 59 based on the horizontal synchronization signal and the vertical synchronization signal.
- the read timing controller 57 and the SDRAM controller 58 read the sampling phase from the SDRAM 59 based on the horizontal synchronizing signal and the vertical synchronizing signal, and the sampling phase read from the SDRAM 59 and the sampling phase detecting means (31) detect it.
- Video signal from SDRAM59 based on the comparison result with the sampling phase It is used as a read control means for determining timing.
- the non-standard signal detection circuit 60 obtains information on the read timing of the video signal with 1 frame delay and the video signal with 2 frame delay from the read timing controller 57, and detects the non-standard signal.
- the detection result of the nonstandard signal is output to the YC separation circuit 17, and the YC separation circuit 17 stops the operation of the frame comb filter when the nonstandard signal is detected.
- the write timing controller 56 sets the effective video period by detecting the horizontal display position and the vertical display position of each sampling point from the reference edge of the horizontal synchronization signal and the vertical synchronization signal.
- the horizontal display position represents the number of clocks that have elapsed since the reference edge of the horizontal sync signal was detected
- the vertical display position represents the reference edge of the horizontal sync signal that was detected after the reference edge of the vertical sync signal was detected.
- the horizontal display position of each sampling point is H and the vertical display position is V
- the coordinates of that point are represented by (H, V).
- the write timing controller 56 assumes that sampling points that exist within a period in which the HV coordinates are 200 ⁇ H ⁇ 1680 and 18 ⁇ V ⁇ 260 are sampling points within the effective video period.
- the read timing controller 57 detects the timing when BO and B1 are equal to each other when TO and T1 are equal, and then enables the first read enable signal for 1480 clocks.
- the values of T0, Tl, B0, and Bl are compared, and the first read enable signal is generated based on the comparison result.
- Figure 16 shows the range of 131 ⁇ 140 and 525 ⁇ 531, and shows the state of the sampling point corresponding to the timing about one frame after Fig.15.
- V 20
- point F which appears after 524 horizontal sync signal reference edges are detected, two vertical sync signals are detected while 525 horizontal sync signal reference edges are detected.
- V 19.
- the values of T, ⁇ , ⁇ , and V at each sampling point shown in Fig. 16 are the forces.
- the write timing controller 56 has the ability to write sampling points to the SDRAM 59 within the period when the HV coordinates are 200 ⁇ ⁇ 1680 and 18 ⁇ V ⁇ 260.
- FIG. 18 shows the state of the sampling point corresponding to the timing about one frame after FIG.
- the values of ⁇ and ⁇ at each sampling point can be found in the same manner as in FIG.
- the HV coordinate force of each sampling point is based on the straight line ⁇ .
- the non-standard signal detection circuit 60 outputs the read enable signal next time.
- the non-standard signal detection circuit 60 reads out the sampling phase detected by the sampling phase detection means 31 (in the timing generation circuit 4) and the storage means (SDR AM 59). A non-standard signal is detected based on the comparison result with the sampling phase.
- the capacity of the frame memory can be reduced as compared with the first and second embodiments.
Abstract
Description
Claims
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0361785U (ja) * | 1989-10-20 | 1991-06-17 | ||
JPH08126027A (ja) * | 1994-10-21 | 1996-05-17 | Hitachi Ltd | ビデオテープレコーダの信号処理装置 |
JP2002064840A (ja) * | 2000-08-23 | 2002-02-28 | Sony Corp | 映像信号用デコーダ装置及びデコード処理におけるライン周波数の最適化方法 |
JP2004007247A (ja) * | 2002-05-31 | 2004-01-08 | Victor Co Of Japan Ltd | Yc分離回路 |
-
2004
- 2004-12-21 JP JP2004369376A patent/JP3953488B2/ja not_active Expired - Fee Related
-
2005
- 2005-06-09 WO PCT/JP2005/010559 patent/WO2006067879A1/ja not_active Application Discontinuation
- 2005-06-15 TW TW94119780A patent/TWI264954B/zh not_active IP Right Cessation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0361785U (ja) * | 1989-10-20 | 1991-06-17 | ||
JPH08126027A (ja) * | 1994-10-21 | 1996-05-17 | Hitachi Ltd | ビデオテープレコーダの信号処理装置 |
JP2002064840A (ja) * | 2000-08-23 | 2002-02-28 | Sony Corp | 映像信号用デコーダ装置及びデコード処理におけるライン周波数の最適化方法 |
JP2004007247A (ja) * | 2002-05-31 | 2004-01-08 | Victor Co Of Japan Ltd | Yc分離回路 |
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