KR0155707B1 - Method and apparatus for fine recording control - Google Patents

Abstract

The present invention is intended to eliminate the blank section generated during recording. A fine recording control apparatus of a recording and reproducing system having a tape as a recording medium and having a pickup means, comprising: key input means for applying information to a tape to perform recording in a fine recording mode, and a tape through the pickup means; DC level detecting means for detecting the DC level of the signal picked up from the video signal; reproducing signal detecting means for detecting the reproduced signal by comparing the signal detected by the DC level detecting means with a predetermined reference signal; Control means for determining whether a signal is recorded on the tape from the output signal and controlling the fine recording mode according to the signal output from the key input means, and performing a mechanism operation from the signal output from the control means. It is configured to include a deck for. Therefore, by detecting the presence or absence of a playback signal on the tape, there is an advantage in that the correct recording start position can be set by removing the blank section generated during recording.

Description

Fine Recording Control Method and Device

1 is a block diagram according to an embodiment of a fine recording control apparatus according to the present invention.

2 is a flowchart for explaining a fine recording control method according to the present invention.

3 is a diagram of a magnetic tape for explaining a recording start position.

4 is a waveform diagram of a head switch pulse for explaining a recording start position.

* Explanation of symbols for main parts of the drawings

10: DC level detection means 11: Y / C separation unit

12 buffer 13 amplification unit

14 filter 20 reproduction signal detection means

30: system control means 40: key input means

50: deck COM1: first comparator

INV1: Inverter

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for fine recording control in a recording and reproducing system. In particular, the present invention relates to a fine recording for accurately performing a recording mode without a blank section by detecting the presence of a playback signal on a tape using an envelope detection function. It relates to a control method and apparatus.

Generally, recording and reproducing systems such as a video cassette recorder (VCR) and a VTR integrated camera (camcorder) using a tape as a recording medium reproduce information recorded on a tape or tune radio signals of a broadcasting station. Can be written to tape.

However, when recording starts by applying the record (REC) key at the interface between (B) and (C), as shown in FIG. 3, part (B) becomes blank and reproduces the recorded signal. Likewise, blanks remain the same, and editing is not done properly.

Recently, fine editing (Fine Editing) function that removes the blank of the connection between recording start and recording stop, and recording stop and recording start has been added to the VCR, but there is a limit to removing the blank under the tape conditions as shown in FIG. There was this.

Accordingly, an object of the present invention is to provide a fine recording control method for improved editing by detecting the presence of a playback signal on a tape to start recording without a blank section in order to solve the above problems.

Another object of the present invention is to provide a fine recording control apparatus most suitable for achieving the above method.

In order to achieve the above object, the present invention relates to a fine recording control method of a recording / playback system comprising a tape as a recording medium and a pickup means; An initial condition setting process for setting an initial condition for performing a fine recording mode on the tape; Determining whether or not a signal is reproduced from the tape by re-running for a predetermined time when the initial condition is set in the initial condition setting process; A fine recording mode execution control process for controlling to perform the fine recording mode from that time when it is determined that the reproduction signal is detected in the reproduction signal presence determination step; And if it is determined that the reproduction signal is not detected in the reproduction signal presence determination step, a search mode execution control process for controlling to perform the search mode from that time until the reproduction signal is detected.

In order to achieve the above another object, the present invention provides a fine recording control apparatus for a recording / playback system comprising a tape as a recording medium and a pickup means; Key input means for applying information to the tape to perform a recording operation in a fine recording mode; DC level detection means for detecting the DC level of the signal picked up from the tape via the pickup means; Reproducing signal detecting means for detecting a reproducing signal by comparing the signal detected by said DC level detecting means with a predetermined reference signal; Control means for judging whether or not a signal is recorded on the tape from the signal output from the reproduction signal detecting means, and controlling performing the fine recording mode according to the signal output from the key input means; And a deck for performing a mechanism operation from a signal output from the control means.

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

1 is a block diagram according to an embodiment of a fine recording control apparatus according to the present invention.

In the block diagram shown in FIG. 1, the DC level detecting means 10 includes a Y / C separating portion for separating the luminance signal and the color signal from the video signal picked up from the tape through the pickup means (not shown). 11), a buffer 12 for buffering the envelope of the signal output from the Y / C separator 11, an amplifier 13 for amplifying the signal output from the buffer 12, and an amplifier ( And a filter 14 for passing only the low-pass component of the signal output from 13).

The reproduction signal detecting means 20 is connected to the first diode D1 connecting the positive terminal to the filter 14, and the non-inverting (+) input terminal is connected to the negative terminal of the first diode D1, and is inverted (-). The input terminal includes a first comparator COM1 connected with a reference voltage terminal, a capacitor C1 connected between a non-inverting (+) input terminal of the first comparator COM1 and a ground terminal, and a first comparator COM1. It consists of an inverter INV1 connected to the output terminal of.

In addition, a system for applying key input information to the system control means 30 connected to the output terminal of the inverter INV1, the deck 50 under the control of the system control means 30, and the system control means 30. Control means (40).

2 is a flowchart for explaining a microrecording control method according to the present invention. Steps 100 to 140 are for setting an initial condition for performing the fine recording mode, and steps 150 to 160 are for the first head. HA) and the second head (HB) is a process for determining whether the 'low' at the same time, steps 170 to 180 are fine when the first head (HA) and the second head (HB) is 'low' at the same time The process of controlling to perform the recording mode, and steps 190 to 230 are the first head (HA) and the second head (HB) when the first head (HA) and the second head (HB) is not 'low' at the same time ) Is a process to control search mode until it becomes 'low' at the same time.

3 is a diagram of a magnetic tape for explaining a recording start position, where (A) is a section in which a video signal is recorded on a tape, (B) is a blank section, and (C) is a REC key applied thereto. This is the section in which the recording mode is performed.

4 is a waveform diagram of a head switching pulse for explaining the recording start position, where HA is a pulse corresponding to the first head and HB is a pulse corresponding to the second head.

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

The DC level detecting means 10 separates the luminance signal and the chromaticity signal (Y / C) from the video signal picked up by the pick-up means in the Y / C separating section 11, and in the buffer 12, The envelope is detected and buffered, amplified by the amplifier 13 to have a predetermined amplification value, and filtered by the filter 14 to have a first predetermined DC level.

The reproducing signal detecting means 20 sets the signal output from the DC level detecting means 10 to the second predetermined DC level with the first diode D1 and the condenser C1, so that the non-inverting of the first comparator COM1 ( +) Is applied to the input terminal and compared with the predetermined reference voltage of the inverting (-) input terminal. Here, the predetermined reference voltage is a DC level value of the signal waveform picked up from the tape at a time point of 11 to 14 ms in each of the switching pulses corresponding to the first head HA and the second head HB shown in FIG. At this time, when the signal value applied to the non-inverting (+) input terminal is greater than the predetermined reference voltage value of the inverting (-) input terminal, the output of the first comparator COM1 is 'high', and when the signal value is small, the first comparator COM1 ) Becomes 'low' and is applied to the control means 30 through the inverter INV1.

The system control means 30 determines that no video signal is recorded on the tape when the signal output from the reproduction signal detecting means 20 is 'high', and when the signal is 'low', the video signal is recorded on the tape. It is determined that the control unit according to the information of the key input means 40 to be described later, the process is as follows. That is, the user controls the deck 50, the process is as follows. That is, it is determined whether the user inserts the tape into the deck 50 and applies the information for performing the recording mode through the key input means 40 (step 100), and whether the tape is the tape capable of performing the recording mode. In step 110, it is determined whether a REC TAB has been detected.

If the REC TAB is detected in step 110, it is determined whether the information for performing the recording mode is a general record key or a fine record key (step 130), and the REC TAB is not detected. If not, the tape is ejected (step 120).

In the case of the normal recording key in step 130, the normal recording mode is performed (step 140), and in the case of the fine recording key, a reverse picture search operation is performed for a predetermined time (step 150). In operation 160, it is determined whether the head switching pulses corresponding to the first head HA and the second head HB are 'low'.

When the head switching pulse corresponding to the first head HA and the second head HB is 'low' in operation 160, it occurs when going from section (B) to section (A) as shown in FIG. 3. The control unit 30 counts the capstan frequency generator (CAP FG) and performs fast playback (F / PB) (step 200). In step 210, the microcontroller starts the fine recording by controlling the deck 40 at the stop. However, when the head switching pulses corresponding to the first head HA and the second head HB are not 'low', the playback signal is not in the section in which the reverse picture search is performed for a predetermined time. The search is performed (step 190) to find a section in which the playback signal is present (step 200).

When the playback signal is found in the reverse direction from the tape in step 200, if the tape is an empty tape, the process proceeds to the beginning of the tape. At this time, it is determined whether the start sensor is detected (step 220) and the start sensor is not detected. In the case of the normal emergency mode (step 230), if the start sensor is detected, the search mode execution is stopped (step 210) and the deck 50 is controlled to perform the fine recording mode (step 180). .

The key input means 60 is configured by adding a fine recording key for carrying out the present invention as well as a conventional recording key.

As described above, in the fine recording control method and apparatus according to the present invention, by detecting the presence of a playback signal on a tape, the blank section generated during recording can be removed to set an accurate recording start position, and the improved screen can be enjoyed during playback. There is an advantage to that.

Claims (3)

A fine recording control method of a recording / reproducing system having a tape as a recording medium and having pickup means; An initial condition setting process for setting an initial condition for performing a fine recording mode on the tape; Reproducing for a predetermined time when the initial condition is set in the initial condition setting process, and determining a state of the pickup means to determine whether there is a signal to be reproduced from the tape; A fine recording mode execution control process for controlling whether or not the reproduction signal is detected again from the time point when the reproduction signal is detected in the reproduction signal presence determination process, and controlling to perform the fine recording mode from the end of the reproduction signal; And a search mode performing control process for controlling to perform a search mode from that time until the playback signal is detected, when it is determined that the playback signal is not detected. Record control method. The method of claim 1, further comprising a recording control process for controlling to start a recording operation from the beginning of the tape when a start sensor is detected in a state in which the playback signal is not detected in the playback signal determination process. Fine recording control method characterized in that. A fine recording control apparatus for a recording and reproducing system having a tape as a recording medium and having pickup means; Key input means for applying information to the tape to perform a recording operation in a fine recording mode; DC level detection means for detecting the DC level of the signal picked up from the tape via the pickup means; Reproducing signal detecting means for detecting a reproducing signal by comparing the signal detected by said DC level detecting means with a predetermined reference signal; Control means for judging whether or not a signal is recorded on the tape from the signal output from the reproduction signal detecting means, and controlling performing the fine recording mode according to the signal output from the key input means; And a deck for performing a mechanism operation from a signal output from the control means.