KR0183671B1 - Apparatus and method for discriminating the type of broadcasting - Google Patents

Abstract

The broadcast method discriminating apparatus and method is for determining a broadcast method to be processed quickly and accurately by using a vertical synchronization signal in a recording / playback system capable of recording and / or reproducing in a multi-broadcast manner. For this purpose, a vertical inter-interval pulse detection unit for generating a window pulse using a predetermined clock pulse from the composite synchronizing signal of the composite image signal applied for recording or reproduction to detect the pulse between the vertical synchronism; And a broadcasting method discrimination unit for counting the number of horizontal synchronizing pulses between the vertical synchronizing units outputted from the vertical synchronizing unit pulse detection unit to determine the broadcasting method applied thereto. Therefore, there is no need to control separately according to the broadcasting method conversion, and because the vertical synchronization signal is used, the broadcasting method discrimination can be made in a short time. Since it is also implemented in hardware, the probability of error occurrence is lower than that of the conventional software processing. The degree of integration can be increased.

Description

Broadcasting Method Discrimination Device and Method

1 is a detailed circuit diagram of a broadcasting method discriminating apparatus according to the present invention.

2 is an output waveform diagram of the main part of FIG. 1 in the case of NTSC broadcasting system.

3 is an output waveform diagram of the main part of FIG. 1 in the PAL broadcasting system.

4 is a flowchart of a broadcasting method discrimination method according to the present invention.

* Explanation of symbols for main parts of the drawings

10: pulse detection unit between vertical dynamics 20: broadcasting method discrimination unit

30: enable control unit 31: vertical synchronization signal section detection means

32: enable control signal generating means

The present invention relates to an apparatus and method for determining an applied broadcasting method in a recording and reproducing apparatus capable of recording and reproducing a multi-broadcasting method. In particular, a broadcasting method discrimination method for determining an applied broadcasting method using a synchronization signal is provided. An apparatus and method are provided.

Generally, broadcasting methods are classified into NTSC (National Television System Committee), PAL (Phase Alternation by Line), and SECAM (Sequenctiel Couleur A Memoire). As a result, a problem arises in that cultures having different broadcast methods cannot share devices receiving broadcast methods.

In order to compensate for this, a recording and reproducing apparatus adaptive to a plurality of broadcast methods has been developed. That is, it is equipped with a broadcasting method switching converter to receive and record a signal made of PAL (or other broadcasting method, for example, NTSC) broadcasting method to a conventional NTSC (or other broadcasting method, for example, PAL, SECAM) VTR. BACKGROUND ART Recording and reproducing apparatuses which process signals to enable reproduction are being developed one after another.

However, in order to control the operation of the broadcasting method switching converter, it is necessary to determine what broadcasting method is the currently received broadcasting method. To this end, in the related art, a broadcast method to be processed currently is determined by counting a frequency of a broadcast method received by a microcomputer (system controller for controlling all functions of the system) or generated for playback. In other words, PAL and SECAM are handled in almost the same way, and PAL and NTSC are very different from each other. Therefore, for discrimination of broadcasting method, the current processing is performed by counting about 60Hz, which is the frequency of NTSC, and 50Hz, which is the frequency of PAL. The broadcast method to be determined was determined.

However, in this case, since both 60Hz or 50Hz must be counted, it takes a lot of time to determine the broadcasting method and incorrectly counts the noise mixed in the broadcasting signal. .

Accordingly, an object of the present invention is to provide a broadcast method discriminating apparatus and method for determining a broadcast method to be processed quickly and accurately by using a vertical synchronization signal.

In order to achieve the above object, the present invention provides a broadcast method discrimination apparatus of a recording / playback system capable of recording or reproducing at least one or more broadcast methods having different types of complex synchronous signals; A vertical inter-pulse pulse detector for generating window pulses using a predetermined clock pulse from the complex synchronizing signal of the composite video signal applied for recording or reproducing to detect pulses between vertical synchronizing mechanisms; And a broadcasting method discrimination unit for determining the broadcasting method applied by counting the number of horizontal synchronization pulses between the vertical synchronizing units outputted from the vertical synchronizing unit pulse detecting unit.

In the broadcast method discrimination method of the recording and playback apparatus as described above to achieve the above object; A vertical synchronizing section detecting process for detecting only a vertical synchronizing section by counting a predetermined clock signal in the composite synchronizing signal separated from the broadcasting video composite video signal applied for recording or reproduction; And a broadcasting method discrimination process for determining the broadcasting method applied by counting the number of pulses of horizontal synchronization loaded in the vertical synchronization device detected in the vertical synchronization device.

Next, the present invention will be described in detail with reference to the accompanying drawings.

1 is a detailed circuit diagram of a broadcasting system discrimination apparatus according to the present invention, and is applied to a recording / playback system capable of signal processing for a plurality of broadcasting systems.

1 is a vertical synchronizing pulse for detecting a pulse generated in the vertical synchronizing signal section by a signal inverting the composite synchronizing signal of the composite video signal applied for recording or reproduction and a clock signal applied externally. The broadcast method discriminator 20 and the broadcast method discriminator 20 for counting the number of horizontal synchronization pulses output from the vertical synchronizing pulse detector 10 to determine the broadcast method. The first flip-flop FF1 used as a stabilization means for maintaining the determination result stably for a predetermined period using a signal inverted from the signal output from the vertical inter-pulse pulse detector 10 as a clock signal, and a pulse between the vertical synchronism. The signal obtained by inverting the signal output from the detector 10 and the composite synchronous signal and the external clock signal are used as clock signals, and are cleared by the system reset signal RESET. The enable control unit 30 is configured to control the enable by outputting a signal for controlling the clear and the self clear.

In more detail, the vertical inter-interval pulse detection unit 10 is enabled and cleared by the first inverter IN1 for inverting the applied composite synchronization signal and the signal output from the first inverter IN1, and The desired window pulse is generated within the vertical synchronization signal section by a logical combination of the first counter CONT1 and the output signal of the first counter CONT1 for counting the clock signal applied from the circuit. It consists of a 1st logical element AND1 for detection.

The broadcast method discrimination unit 20 is output from the second counter CONT2 and the second counter CONT2 using the signal output from the first logical element AND1 of the pulse detector 10 between the vertical dynamics as the clock signal. The second logical element AND2 outputs high when the number 6 of the vertical synchronization pulses of the NTSC broadcasting system is counted by logical combination of signals, and outputs low at other count values.

The first flip-flop FF1 as a stabilization means connects the output signal of the second logic element AND2 to the D input terminal, and uses the inverted signal output from the pulse detection unit 10 as the clock signal. The D-type flip-flop is cleared by the reset signal RESET of the system. The output of the non-inverting output terminal Q of the first flip flop FF1 becomes a control signal for selecting an NTSC / PAL signal processing circuit. The first flip-flop FF1 is cleared by the reset signal RESET of the system.

The enable control unit 30 includes a vertical synchronous signal section detecting unit 31 for detecting a minimum vertical synchronous section of a broadcasting method by using a signal obtained by inverting a signal output from the vertical inter-unit pulse detecting unit 10 as a clock signal; Enable to generate a signal for controlling the enable control of the broadcast method discrimination unit 20 and the enable of the vertical synchronization signal section detection means 31 according to the signal output from the vertical synchronization signal section detection means 31. Control signal generating means (32).

The vertical synchronizing signal section detecting unit 31 is enabled by the signal output from the enable control signal generating unit 32 and counts the inverted signal of the output as the clock signal in the vertical synchronizing unit pulse detecting unit 10. Among the signals output from the third counter CONT3, the first detection device AND3 for detecting the point at which the first count value is generated among the signals output from the third counter CONT3, and the signal output from the third counter CONT3. The second detection device AND4 and the output signal of the first detection device AND3 for detecting the point where the value of counting the last pulse of the broadcasting method having the vertical dynamic range of the broadcasting system are generated are connected to the J input terminal. The JK flip-flop FF2 and the JK flip that connect the output signal of the second detection device AND4 to the K input terminal and are cleared by the system reset signal RESET and connected to the clock terminal. Flop (F And a third inverting element IN3 for inverting the non-inverting output signal output from F2). The second flip-flop FF2 is cleared by the reset signal RESET of the system. In addition, in the present embodiment, since it is an example applied to a recording / playback system capable of using both NTSC and PAL broadcasting methods, the vertical synchronization signal section is detected based on PAL having 2.5H of vertical synchronization devices of the broadcasting method.

The enable control signal generating means 32 includes a third logical element AND5 for ANDing the output signal of the vertical synchronization signal section detecting means 31 and the system reset signal RESET, and a third logical element AND5 from the third logical element AND5. The fourth counter CONT4, which is cleared by the output signal and uses the composite synchronous signal as the clock signal, and the third detection device NAND for detecting the second counted value from the signal output from the fourth counter CONT4. Is done. Here, the output of the third detection device NAND is output to the clear terminals of the third counter CONT3 and the second counter CONT2.

The first to third logic devices AND1 and AND2 and the first and second detection devices AND3 and AND4 are logical multiplication devices and the third detection device NAND is negative logic devices. The logic elements also serve as detection or discriminating elements.

2a to j are output waveform diagrams of the main part of FIG. 1 for the NTSC broadcasting synchronous signal, FIG. 2a is an NTSC broadcasting system, and FIG. 2b is an output signal of the first inverter IN1, FIG. 2c is an output signal of the first counter CONT1 for the clock signal applied from the outside, and FIG. 2d is a signal output from the pulse detector 10 of the vertical dynamic period, and FIG. 2f is an output waveform diagram of the first flip-flop FF1, 2g is an output signal of the first detection device AND3 of the vertical synchronization signal section detecting means 31, and 2h is a second waveform. Fig. 2i is an output signal of the second flip-flop FF2, and Fig. 2j is a signal output from the enable control signal generating means 32. Figs.

3A to J show waveform diagrams output from the circuit of FIG. 1 in the case of the PAL broadcasting system.

4 is a flowchart of a broadcasting method discrimination method according to the present invention. Steps 11 and 12 detect a window pulse of a pulse generated in a vertical synchronizing period from a composite synchronizing signal to detect a pulse between the vertical synchronizing units. , Steps 13 and 14 are processes for determining the broadcasting method by counting the pulses of the horizontal synchronizing signal between the vertical synchronizing units outputted during the pulse detection process between the vertical synchronizing units. to be.

The operation of the present invention will then be described in detail with reference to FIGS. 1, 2, 3 and 4.

First of all, the NTSC and PAL broadcasting methods used in the present embodiment are different from each other in many respects. In particular, in the case of the NTSC, the equalized pulse, the vertical synchronous signal section and the lated pulse section are the NTSC in the synchronization signal to be used in the present invention. The 3Hs are all assigned to 9H, and in the case of PAL, the 2.5Hs are all allocated to 7.5H. By using this, the applied broadcasting method is determined.

In the case where the applied composite synchronizing signal is NTSC, when a synchronizing signal such as FIG. It is applied to enable terminal and clear terminal of. The first counter CONT1 is enabled at the rising edge of the applied pulse and is cleared at the falling edge to count clock pulses applied from the outside. The count for the clock signal is enabled and counted on the rising edge of FIG. 2b and cleared on the falling edge as shown in FIG. By this iterative process, the pulse in the section of the vertical synchronization signal is separated from the composite synchronization signal (step 11). The clock pulse is applied with a frequency higher than that of the synchronization signal.

With respect to the output value of the first counter CONT1 output in this manner, the first logical element AND1 stands for one SERR (Serrvation) in the vertical synchronizing section, and the vertical synchronizing signal is in the form of this SERR signal. A window pulse is output so that a pulse of? Is outputted to detect a pulse (or number of pulses) of the vertical synchronization signal (step 12). For example, if the period in which the externally generated clock pulse is counted 10 times lies between the point where the high section of the equalization pulse ends and the point where the high end of the SERR pulse in the vertical synchronization signal section ends, the first logic device AND1 becomes high. The output point (the point at which the window pulse (weak W) is generated) is output when the first counter CONT1 counts the external clock signal 10th.

Therefore, when the N-bit value output from the first counter CONT1 is represented by 4 bits, 10 is outputted as 1010. Since the first logical element AND1 calculates the logical product with respect to the input signal, all input signals are high. It must be applied to output high. Therefore, the inverter is mounted on the terminal for outputting the signals of the 3rd bit and the 1st bit so that high is applied to both logic devices AND1. The above-described inverters are not shown because they may be set differently according to the count value output from the first counter CONT1.

When the number of pulses of the horizontal synchronizing signal between the vertical synchronizing units detected by the second counter CONT2 in the vertical synchronizing pulse detection unit 10 as shown in FIG. 2d at the second counter CONT2 is applied to the clock terminal, enable control will be described later. The number of pulses of the vertical synchronization signal applied to the clock terminal while being enabled by the enable control signal output from the signal generator 30 is counted (step 13). The counted result is applied to the next logical device AND2, which is also operated in the same manner as the first logical device AND1 used in the above-described vertical inter-pulse pulse detector 10. When the output of the second counter CONT2 becomes 6, it operates to output high at the rising edge of 6 as shown in FIG. 2E (step 14). This is because the number of vertical synchronization pulses of the NTSC becomes six as shown in FIG. 2d, and is for outputting high only in the case of NTSC. In this case, since it is NTSC, the first logic device AND1 outputs high. Inverters are mounted on the output terminal of the second counter CONT2 in order to output high when the value of the second logic device AND2 is 6, which is output from the second counter CONT2. Same as one case.

In the first flip-flop FF1, which is a stabilization means, the signal output from the current broadcasting method discrimination unit 20 becomes high, so the signal applied to the input terminal D becomes high. The first flip-flop FF1 receives the output signal of the pulse detection unit 10 between the vertical synchronism units as the clock signal through the second inverter IN2, so that the D input terminal is connected at the falling edge of the window pulse with respect to the vertical synchronization pulse of FIG. Output logic to the non-inverting output stage. Since the high signal is applied to the D input terminal, the non-inverted output signal is output in high logic like 2f. This is an NTSC / PAL control signal, which is directly applied to a circuit (not shown) that performs signal processing for NTSC and PAL broadcasting, so that the signal processing corresponding to the broadcasting method of the applied video and / or audio signal can be controlled. It may be applied to a terminal to which the conventional broadcast mode setting control signal of the microcomputer (not shown) is applied (step 15).

The enable control signal generator 30 checks the broadcasting system discrimination every vertical synchronous, and the window pulse of FIG. 2d output from the vertical synchronous signal pulse detector 10 is the second inverter IN2. When applied to the clock terminal of the third counter (CONT3) through, the count is at the falling edge of the window pulse. The count result is applied to the first and second detection elements AND3 and AND4 in the next stage.

When the first count value of the third counter CONT3 is output, the first detection device AND3 outputs a high point to indicate a point at which a pulse of the first vertical synchronization signal generated is generated, as shown in FIG. 2g of the third counter CONT3. Outputs high on the falling edge of the first count value and outputs the signal falling low on the falling edge of the second count value. The second detection device AND4 outputs high when the count value of the third counter CONT3 becomes 5 in the same principle as the first detection device AND4, and goes low when the sixth pulse is counted. Output the falling signal.

The output signals of the first and second detection devices AND1 and AND2 are applied to the JK input terminal of the second flip-flop FF2. The second flip-flop FF2 outputs high when the logic of the signal applied to the J input terminal is high, and outputs a low when the logic of the signal applied to the J input terminal is high. When the output signals of the first and second detection devices AND1 and AND2 are applied to the JK input terminal as shown in the second (h), the non-inverting output signal as shown in the second i is output to the horizontal synchronization signal of the vertical synchronization signal for the vertical synchronization period. Detect the minimum interval needed to count pulses The reason why the second detection device AND4 detects the fifth point where the window pulse is generated is to detect the minimum vertical synchronization signal section as described above.

The signal output as described above is applied as an input signal of one side of the third logic device AND5 through the third inverter IN3. The third logic device AND5 performs a logical multiplication on the signal applied through the third inverter IN3 and the system reset signal RESET. As a result, since the signal inverted in FIG. 2i is applied to one input terminal, the system reset signal is output as it is in the remaining sections except for the high section of FIG.

The fourth counter CONT4 is cleared by the output signal of the third logic device AND5. The third logic device AND5 outputs the low logic in the high section of FIG. 2i, so the fourth counter CONT4 is in the interval. Cleared to count the composite synchronous signal. At this time, the fourth logic element NAND connected to the output terminal of the fourth counter CONT4 has a low logic like the second j when a value for counting the second clock signal is output after the fourth counter CONT4 is cleared. Is output to the clear terminal of the second counter CONT2 and the third counter CONT3 of the broadcast method discrimination unit 20 to be cleared. As a result, the enable control signal generator 30 and the broadcast method discrimination unit 20 are cleared immediately after the detection of the vertical synchronization pulse is completed, and waits to detect the next vertical synchronization pulse. However, when the second counter CONT2 of the broadcasting method discrimination unit 20 is cleared using the reset signal RESET of the system without using the enable control signal generator 30, the vertical synchronous power is applied. It may have a function of discriminating the broadcasting method applied once in the reset operation.

When the applied composite synchronization signal is a PAL broadcast method, the vertical inter-synchronous pulse detection unit 10 clears the falling edge of the signal of FIG. 3b from the first counter CONT1 as shown in FIG. 3a. And enable control at the rising edge to count the clock signal applied from the outside. At this time, the externally applied clock signal is counted and output only in a section in which the waveform of FIG. 3b is high as in FIG. 3c. At this time, the counted result value is applied to the first logical element AND1 of the next stage as in the NTSC. The first logic element AND1 outputs high logic only at the same count value as in the aforementioned NTSC. Therefore, the same signal as 3d is output.

Since the signal output from the vertical inter-pulse pulse detector 10 is the same as 3d, the broadcast method discriminator 20 counts and clears five pulses. As a result, the second logic device AND2 outputs high only to the six count values, thereby outputting the third logic and the low logic.

The output signal is applied to the D input terminal of the first flip flop FF1 so that low logic is applied to the D input terminal of the first flip flop FF1. The first flip-flop FF1, which operates in the same manner as in NTSC, is clocked at the falling edge of the signal output from the vertical inter-pulse pulse detector 10 to output the logic of the signal applied to the D input terminal. Since low logic is currently applied, the non-inverted output signal of the first flip-flop FF1 is output in low logic. As a result, the broadcast method signal processing circuit (not shown) is informed that the broadcast method to be processed is PAL (step 16).

The enable control signal generator 30 operates in the same manner as in NTSC.

As described above, the present invention does not need to perform separate control according to the broadcast method conversion by automatically controlling the signal processing to be adaptively performed according to the currently applied broadcast method in the recording / playback apparatus adopting the multi-broadcast method. By using the synchronization signal, the broadcasting method can be quickly identified, and the hardware is implemented in hardware. Therefore, the probability of error occurrence is lower and the degree of integration is higher than the conventional software processing.

Claims (7)

A broadcast method discrimination apparatus of a recording / playback system capable of recording or reproducing at least one or more broadcast methods having different types of complex synchronous signals; A vertical synchronizing period for generating horizontal pulses during the vertical synchronizing period by generating a window pulse to detect a vertical synchronizing period using a predetermined clock pulse in the composite synchronizing signal of the composite image signal applied for recording or reproduction. A pulse detector 10; The broadcasting method discrimination unit 20 for counting the number of horizontal synchronization pulses generated during the vertical synchronization output from the vertical inter-interval pulse detection unit 10 and determining the broadcasting method applied according to the counted result Broadcasting method discrimination apparatus comprising a. The apparatus of claim 1, wherein the broadcast method discriminating apparatus comprises an enable control signal generator (30) for generating a control signal for enabling the broadcast method discriminating unit (20) in order to determine the broadcast method in units of one field. Broadcasting method discrimination apparatus characterized in that it further comprises. The apparatus of claim 1, further comprising stabilizing means (FF1) for stabilizing the output of the discrimination result by maintaining a constant logic of the discrimination signal output from the broadcasting mode discrimination unit 20. A broadcasting method discrimination apparatus characterized by the above-mentioned. According to claim 1, wherein the vertical synchronization signal pulse detection unit 10 is a counter (CONT1) for counting the clock pulse controlled by the composite synchronization signal and the count value output from the counter (CONT1) is the vertical synchronization And a detection means for detecting when a value of a point at which only a pulse in a signal section can be detected is reached. The counter system of claim 1, wherein the broadcasting system discrimination unit 20 includes a counter CONT2 for counting the number of horizontal synchronizing pulses during the vertical synchronizing period detected by the vertical synchronizing pulse detecting unit 10, and the counter. And a discriminating means for discriminating the broadcasting method in accordance with the count value output from CONT2. The vertical synchronization signal of claim 1, wherein the enable control signal generator 30 detects a minimum vertical synchronization signal section within a vertical synchronization signal section based on a signal output from the vertical synchronization signal pulse detector 10. When the interval between the section detecting means 31 and the vertical synchronous signal section detected by the vertical synchronous signal section detecting means 31 ends and a predetermined time has elapsed, the broadcasting method discrimination unit 20 and the vertical synchronous signal section detecting means 31 Broadcast control device, characterized in that consisting of the enable control signal generating means (32) for controlling to be enabled. A broadcast method discrimination method of a recording / playback system capable of recording or reproducing at least one or more broadcast methods having different types of complex synchronous signals; A vertical synchronizing period detecting process for windowing only a vertical synchronizing period by a count of a predetermined clock signal in the composite synchronizing signal separated from the composite video signal of the broadcasting method applied for recording or reproduction; And a broadcast method discrimination process for determining an applied broadcast method by counting the number of pulses generated during the vertical sync interval detected in the vertical sync interval detection process.