KR19980017882A - Connection recording method using Bismark - Google Patents

Abstract

The present invention provides a Viss Mark at the end of the front recording part in order to minimize the overlapping part when the front recording part end and the rear recording start part overlap with each other during the recording of the recording-pose-recording in VSI. At the beginning of the next recording, the recording starts from the number of Viss-1 recorded in the previous recording section, thereby minimizing the actual overlap to one Viss number.

A feature of the present invention is that if there is a pause / stop key input while recording a video signal on the tape, recording the n bismarks from the time point and back running the tape a certain distance; and after the step, the pause / record key input is performed. If there is, the first step of executing the count start at the same time as the tape running and the first count value (Y) until the bismark recorded at the pause / stop in this step is read is reached. A second step of repeating the execution of the connected recording mode in the third step until the second step is obtained; and a fourth step of determining the presence or absence of the bismark when the current count value reaches the set first count value in the second step. And, if there is no vismark at the step, it is determined whether the second count value X corresponding to the maximum bismark lead setting distance for connection recording is reached and the current count is determined. If the second count value (X) is less than the fifth step of executing the process after the third step; and if the current count value reaches the second count value (X) in the fifth step, recording recording is executed. A sixth step of counting the vis signal when the vis signal is detected in the eighth step and the fourth step; and determining whether the vis mark is n-1 after execution of the sixth step. A sequence consisting of a seventh step of executing the process after the third step if it is not one, and a ninth step of performing the recording operation of the bismark following the execution of the recording operation of the eighth step if the number of non-smarks is n-1 in the step; Through the bismark search and accurate recording of the bismark, it is possible to accurately record the bismark for recognizing the position of the video signal on the videotape.

Description

Connection recording method using Bismark

The present invention relates to a bismark setting for navigating a specific screen in VSI, and in particular, when continuously recording video signals on a tape while switching from recording mode to pause mode and from pause mode to recording mode. The present invention relates to a connection recording method using Bismark to accurately take a Bismarck setting.

1 is a circuit diagram of a control signal reproducing and waveform converting apparatus for executing a conventional VISS function.

The circuit comprises a control head 2 for reproducing the control signal from the video tape 1, an amplifier 3 for amplifying the reproduction control signal, and a duty ratio corresponding to the control signal period for the amplified control signal. Waveform conversion section 4 (Schmidt trigger circuit) for converting the control pulses into the control pulses.

In the conventional control reproducing system having such a configuration, waveform conversion is performed by detecting a general control signal having a standard as shown in FIG. 2A and a VISS control signal as shown in FIG. 2B as a control signal recorded on the videotape 1. Will let you.

In the normal regeneration control pulse as shown in FIG. 2A, the high pulse width TH and the low pulse TL are T = TH + TL and TH / T × 100 [%] = 60 [in the control signal period T. %] Has a duty ratio of ± 5 [%].

The VISS control signal pulse shown in Fig. 2B has a duty ratio of TH / T x 100 [%] = 27.5 [%] ± 2.5 [%] in the signal period T.

Here, the control pulse shown in Fig. 2A is normal SP regeneration (tape speed: 33.35 mm / sec) or EP regeneration (tape speed: 11.12 mm / sec) or SP 9 times speed regeneration based on NTSC. CUE) and the control signal pulse detected at 27 times speed reproduction, and the control pulse shown in FIG. 2B is the pulse of the control signal detected at 200 times speed (FF or REW).

The reproduction process of such a control pulse is as follows.

The control pulse recorded in the control track of the video tape 1 is reproduced by the control head 2 in the waveform as shown in FIG. 3A. Since the reproduced control signal is weak, the control pulse is transmitted through the amplifier 3. It is amplified as (B) of 3.

The amplifier 3 is an amplifier having a gain of 60 [dB]. The amplifier 3 is amplified to 1VP-P because the input control signal is 1mVP-P.

The amplified control signal is supplied to the Schmitt trigger circuit 4, and the Schmitt trigger circuit 4 converts the control signal into a pulse as shown in FIG. 3C corresponding to the period of the input control signal and outputs the waveform.

The output control pulse is supplied to the system control unit of the VCR or camcorder and is provided as phase control information of the capstan motor, real time counter operation information, or information for detecting the VISS signal.

In addition, the above-described control playback / conversion operation will be described.

The control signal reproduced from the control head 2 (see FIG. 3A) is input to the amplifier 3, which first passes through the noise removing circuits of the resistors R1 and condenser C1 and removes the noise and the resistors. It is supplied to the input terminal (+) of the operational amplifier A1 via R2.

The operational amplifier A1 amplifies and outputs the input control signal to a level sufficient for waveform conversion by the gain G defined by the resistors R3, R4, and the capacitor C3.

Where G = 1 + [[｛R4 × / 1 (2πfC3)｝ / fR4 + 1 / (2πfC3 g] / R3].

On the other hand, in the amplifier 3, the resistors R5 and R6 act as bias biasing resistors of the operational amplifier A1 to perform the power supply (+ VCC) voltage division, and the capacitor C2 is for noise removal. C4) is a power supply decoupling capacitor.

The amplified control signal (see FIG. 3B) is input to the Schmitt trigger circuit 4.

The Schmitt trigger circuit 4 is composed of a comparator A2, a resistor R7 (R8) and a power supply bias resistor R9 for setting a threshold voltage (± VTH).

Therefore, the control signal supplied to the input terminal (+) of the comparator A2 has the output of the comparator A2 at a level of + VTH or more based on ± VTH as shown in (A) of FIG. 4 (B). As shown in the figure, it becomes high (H), and below -VTH, the output of the comparator A2 becomes low (L).

That is, the control signal output from the output terminal becomes a control pulse waveform-converted into a period corresponding to the control signal period as shown in FIGS. 3C and 4B.

In the circuit, VTH = input voltage x R7 / (R7 + R8) [V].

As described above, the conventional control signal reproducing and waveform converting apparatus which reproduces the control signal and converts the waveform into the control pulse can detect the control signal and convert the waveform in the normal reproducing mode without error. If it is recorded on the video tape, there is a hassle of having to find the recording scene while the user checks the first part of the screen to be searched.

FIG. 5 is a flowchart illustrating the execution of a conventional VISS. When a tape is played by a VCR, an index search is first selected according to a VISS command to determine whether a positive key is pressed.

If the (+) key is input, FF is performed to check whether the duty ratio (6: 4) is present. Since the normal control pulse duty ratio is 4: 6, proceed with FF until a duty ratio of 6: 4 is obtained.

In case of negative (-) key input, it performs REW until it finds a control signal of 6: 4 duty ratio that displays the recording start area as in the previous method.

When a change in duty ratio is detected in this way, the point is determined as the start of the program, the FF or REW function is stopped, and playback is performed.

However, the existing bismark setting for indexes that operates in this way registers the recording start point and the end point of each program over the entire length of the tape, so that the end service mark for the previous program and the start service mark for the next program are used. There was a duplicate search error due to misinterpretation of Bismarck.

SUMMARY OF THE INVENTION An object of the present invention is to set a bismark for searching a specific screen in VSI, and to record a video signal on a tape while switching from recording mode to pause mode and from pause mode to recording mode. It is to provide a connection recording method using Bismarck that can minimize the search error caused by misidentification of Bismarck.

A feature of the present invention is that if there is a pause / stop key input while recording a video signal on the tape, recording the n bismarks from the time point and back running the tape a certain distance; and after the step, the pause / record key input is performed. If there is, the first step of executing the count start at the same time as the tape running and the first count value (Y) until the bismark recorded at the pause / stop in this step is read is reached. A second step of repeating the execution of the connected recording mode in the third step until the second step is obtained; and a fourth step of determining the presence or absence of the bismark when the current count value reaches the set first count value in the second step. And, if there is no vismark at the step, it is determined whether the second count value X corresponding to the maximum bismark lead setting distance for connection recording is reached and the current count is determined. If the second count value (X) is less than the fifth step of executing the process after the third step; and if the current count value reaches the second count value (X) in the fifth step, recording recording is executed. A sixth step of counting the vis signal when the vis signal is detected in the eighth step and the fourth step; and determining whether the vis mark is n-1 after execution of the sixth step. A sequence consisting of a seventh step of executing the process after the third step if it is not one, and a ninth step of performing the recording operation of the bismark following the execution of the recording operation of the eighth step if the number of non-smarks is n-1 in the step; Through bismarck search and accurate recording of bismarck, it is possible to precisely connect and record bismarck for video retrieval on video tape.

1 is a circuit configuration diagram of a conventional screen navigation system (VISS).

FIG. 2 is a control signal output waveform diagram of FIG. 1.

3 is a signal waveform diagram of each part of FIG. 1.

4 is a detailed waveform diagram of each part of FIG. 1.

5 is a flowchart of a conventional VISS execution.

Figure 6 is a circuit diagram of a VSI system to be applied to the present invention.

7 is a timing chart for explaining the present invention.

8 is a flowchart illustrating the present invention.

＊＊ Explanation of symbols on main parts of drawing ＊＊

10: video signal processing circuit 11: synchronous separation circuit

12: dispense circuit 13: control head

14: preamplification circuit 15: Schmitt trigger circuit

16: Deck 17: Key In Circuit

18: timer circuit 19: microcomputer

The present invention will be described below with reference to the accompanying drawings.

6 is a circuit diagram of a VSI system for implementing the present invention.

As referred to herein, the tape reproduction video signal output from the video signal processing circuit 10 is connected to be applied to the synchronous separation circuit 11 under the control of the microcomputer 19.

The synchronous separation circuit 11 separates the 60HZ synchronous signal from the input video signal and transmits the synchronous signal to the frequency division circuit 12.

The division circuit 12 divides the 60HZ synchronization signal output from the synchronization separation circuit 11 into ½ to generate a 30Hz control signal, and connects it to the control head 13.

As a result, the bismark for search by the control head is recorded on the tape's control track as the duty opposite to that of the normal control pulse.

The control pulse signal reproduced by the control head 13 is connected to be applied to the microcomputer 19 via the preamplification circuit 14 and the Schmitt trigger circuit 15.

Therefore, the control pulse including the specific duty picked up by the control head is amplified and signal-formed and provided to the microcomputer.

The microcomputer 19 has a deck 16 for driving a tape and a timer circuit 18, and has a key input circuit 17 for setting and commanding a function by a user.

The implementation process of the present invention in such a VSI system will be described in detail with reference to FIGS. 7 and 8 as follows.

Fig. 7 is a timing chart for the bismark continuous recording process when continuously recording video signals on a video tape.

As shown here, when the user presses the recording pause key or the recording stop key by using the key input circuit 17 to exclude an unnecessary portion of recording such as an advertisement while recording a program on the tape, At the time of the key or stop key input, the microcomputer 19 controls the deck 16 after n bismarks have been recorded on the tape through the control head 13 so that the tape is reversed by a predetermined distance.

In this way, when the pause position or the recording restart key is input through the key input circuit while the recording position of the actual tape is reversed by a certain distance according to the pause key or the stop key input during the recording, the microcomputer 19 enters the deck. (16) is operated to drive the tape and start counting through the timer circuit 18 at the same time.

That is, in the first step S1 of the connection recording execution process using the bismark according to the present invention, if there is a pause / stop key input while recording the video signal on the tape, n bismarks are recorded from that point in time and the tape is recorded. In the state of waiting for a certain distance reverse driving, if there is a pause release key input or redo recording key input, the tape starts running and count starts at the same time.

A second step S2 is then performed to determine whether the first count value Y corresponding to the time until the bismark recorded on the tape is read at the pause / stop in the first step is reached. ).

Here, the first count value Y is set to the time taken to reach the normal reproduction traveling speed from the reverse running state to the bismark start point indicating the position of the pause or stop key input point.

If the current count value does not reach the first count value Y as a result of the determination of the second step, the counting operation of the first step is continued through the connection recording operation standby mode of the third step S3.

However, if the current count value reaches the first count value Y in the second step, the fourth step S4 of determining the presence or absence of the bismark is performed.

A fifth step S5 of determining whether or not the bismark is detected in the fourth step and determining whether the second mark value X corresponding to the maximum allowable bismark lead setting distance for connection recording is reached if there is no vismark; Run

If the current count value is less than the second count value X, the counting operation of the first step is continued through the connection recording operation standby mode of the third step S3.

However, if the present count value reaches the second count value X in the fifth step, the process goes to the eighth step S8 to perform the recording and recording operation of the video signal on the video tape.

On the other hand, when the vis signal is detected in the fourth step, a sixth step S6 of counting the detected vis signal is executed.

After the execution of the sixth step, the seventh step S7 of determining whether the Bismark is n-1 individual is executed.

If the number of Bismarks is not n-1, the counting operation of the first step is continued through the connection recording operation standby mode of the third step S3.

In the seventh step, if there are n-1 bismarks, an eighth step of recording and recording a video signal on a video tape is executed, followed by a ninth step (S9) of recording m bismarks simultaneously with video recording. do.

Through this process, the Bismark is recorded consistently when recording the continuous program using the pause function.

As described above, the present invention provides a method for continuously recording a video signal on a tape while switching from recording mode to pause mode and from pause mode to recording mode when setting a bismark for searching a specific screen in VSI. By setting the bismark correctly, the unique effect of minimizing the search error caused by the misidentification of the bismark is shown.

Claims (1)

A key input circuit 17 including a bismark setting function key, a deck 16 for driving tape, a timer circuit 18 for counting, a control head 13 and a microcomputer 19 for controlling them organically. In a VSI system comprising, when there is a pause / stop key input while recording a video signal on a tape, n bismarks are recorded from that time point, and the tape is reversed for a predetermined distance, and then the pause / record key input is performed. If so, the first step of executing the count start at the same time as the tape running and the first count value Y until the bismark recorded at the pause / stop in this step is reached is determined. A second step of repeating the execution of the connected recording mode of the third step until the second count is obtained; and when the current count value reaches the first count value set in the second step, In the fourth step of determining the presence or absence of the non-smark in the step, it is determined whether the second count value X corresponding to the maximum bismark lead setting distance for connection recording is reached and the current count value is the second count. A fifth step of executing the process after the third step if the value X is not reached; an eighth step of executing recording recording if the current count value reaches the second count value X in the fifth step; If the non-smark is detected in the fourth step, the sixth step of counting the vis signal is determined, and after execution of the sixth step, it is determined whether the non-smark is n-1. A seventh step of executing a process after step 3, and a ninth step of executing m recordings of m bismarks following the execution of the eighth step of the recording operation if the number of non-smarks is n-1. With Bismark How angry.