KR19980085955A - Video cassette recorder with automatic moving playback of video tape section - Google Patents

Abstract

The present invention is directed to a video cassette recorder having a function of automatically moving and playing a normal section of a video tape, which allows the playback operation to be performed only for a normal section during a playback operation based on the index data marked by a tape section searching function. The present invention relates to a video and audio head (6, HD2) for reading video and audio signals recorded in a contracted area of a video tape, and to a playback signal read by the video and audio head (6, HD2). A video cassette recorder comprising reproduction signal processing units (20, 14) to be provided; Key input sections 31 and 32 for inputting a normal section selective playback function execution command, a CTL head HD1 for reading a CTL signal recorded in a contracted section of a video tape during a playback operation, and the CTL head HD1. The pulse judging unit 34 detects the duty ratio of the signal read out by the ") and outputs a level signal corresponding to the detected duty ratio, and the index data recorded at the start point and the end point of the tape defect section. The index data information storage unit 37 for storing and setting the duty ratio discrimination criteria for the duty ratio, and from the pulse judgment unit 34 on the basis of the data set in the index data information storage unit 37 when the normal section selection and reproduction function is selected. And a control unit 33 for retrieving the applied level signal so as to perform fast reproduction at a predetermined double speed for the tape failure state determination section.

Description

Video cassette recorder with automatic moving playback of video tape section

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video cassette recorder. In particular, the automatic playback of a normal section of a video tape, which enables tape playback to be performed only for a normal section during a PLAY, based on the data information indexed by the tape defect section search function. A video cassette recorder with a function is provided.

Fig. 1 is a block diagram for explaining a playback operation in a conventional video cassette recorder (hereinafter referred to as VCR).

In FIG. 1, reference numeral 1 denotes a remote controller for remote control of the entire apparatus, and 2 denotes a receiver which receives an infrared signal transmitted from the remote controller 1 and converts it into an electrical code signal. It is a system controller as a control unit that controls the operation of the entire apparatus based on the code signal output from 2).

In addition, reference numeral 4 is a supply reel to convey the tape wound while rotating in a constant direction, 5 is a rewind reel to rewind the tape released from the supply reel (4), 6 is from the system controller (3) A recording / playback head for recording a video signal on a tape conveyed from the supply reel 4 or reading out recorded video data in accordance with a predetermined control signal of < RTI ID = 0.0 > 7, < / RTI > The head drive unit 8 for driving control is a switching unit for performing switching switching according to the execution of the recording or reproducing operation on the basis of a predetermined control signal from the system controller 3.

On the other hand, reference numeral P _in denotes a video signal input terminal for receiving a video signal from a TV receiver or a camcorder connected to a VCR, and reference numeral 9 denotes an image applied to the inside of the apparatus through this video signal input terminal P _in . A recording signal processing stage for processing a signal in the form of a signal for recording, and the recording signal processing stage 9 includes a YC separation section 9a for separating and outputting the luminance signal Y and the color tone signal C; And an FM modulation circuit 9b for frequency modulation (FM) the luminance signal Y separated and output from the YC separation unit 9a, and a color tone signal separated and output from the luminance signal by the YC separation unit 9a. The luminance signal Y and the hue signal respectively outputted from the frequency low pass conversion circuit 9c, the FM modulator 9b and the frequency low pass conversion circuit 9c, which convert (C) into a low band frequency signal and output the result. C) a mixer (MIXER) 9d for mixing, and a video signal mixed in the mixer 9d. The fixed terminal (R; recording) of the amplified signal by amplifying a constant level, the switching part 8 is composed of an amplification section (9e) to be supplied to.

Reference numeral HD2 denotes an audio head for recording and reading audio signals, and reference numeral 14 denotes an amplifying unit for amplifying and outputting audio signals read out from the audio head HD2.

Further, reference numeral 20 denotes a reproduction signal processing stage for processing the reproduction video signal read out by the recording / reproducing head 6 during the reproduction operation. The reproduction signal processing stage 20 is the switching unit 8. A high-pass passage for detecting only the luminance signal Y of the preamplifier 20a for amplifying and outputting the video reproduction signal applied to the fixed terminal P side of the output signal. A high pass filter (HPF) 20b, an FM demodulation circuit 20c for demodulating the luminance signal output from the high pass filter 20b (hereinafter referred to as HPF), and the preamplifier 20a. Low Pass Filter (LPF) 20d for detecting only the hue signal C among the reproduction signals outputted from the < Desc / Clms Page number 11 > signal, and the hue output from the low pass filter 20d (hereinafter referred to as LPF). A frequency high frequency conversion circuit 20e for converting a signal into a high frequency signal of a predetermined frequency band, and the FM demodulation A mixer (MIXER) 20f for synthesizing the luminance signal Y output from the furnace 20c and the hue signal C output from the frequency high-frequency conversion circuit 20e, and synthesized by the mixer 20f. And an amplifier 20g for amplifying the reproduced video signal to a predetermined level.

On the other hand, reference numeral _Pout2 is an output terminal for outputting a reproduced video signal amplified by this amplifier 20g to a video output device such as a TV.

That is, in the conventional general VCR having the above-described configuration, in response to a user inputting a play execution command through the remote controller 1, the system controller 3 sets the contact of the switching unit 8 to the fixed terminal P (Play). ), And as a result, the luminance signal Y and the color tone signal C read out by the recording / reproducing head 6 are each processed by a predetermined reproducing process, so that the mixer 20f As a result, the reproduced video signal is output through the video output terminal P _out2 and the reproduced audio signal is output through the audio output terminal P _out1 .

On the other hand, the video tape may be aged due to long-term use, or the recording surface of the tape may be damaged due to inexperienced operation of the device. Reusing such tape may damage the device every time it is played. As shown in (d) of FIG. 2, the output waveform of the reproduction signal is abnormally detected, such as the shape of the envelope is severely distorted, compared to the normal (b) waveform, resulting in deterioration of image quality. .

Therefore, the user should watch the bad video and audio of the corresponding section every time the playing operation of the tape, and if recording on such a tape, if the image quality and sound quality of the damaged section is severe, the user will be unable to view the section. It does not mean anything.

On the other hand, recently, in order to solve the above problem, a defective section of the tape is searched based on the envelope DC level of the reproduced video signal, and predetermined index data is recorded using the CTL signal at the start and end points of the defective section. As a result, a VCR has been developed that has a bad section indexing function of a video record, which is designed to refer to the tape during playback or recording.

The present invention has been made in view of the above circumstances, and based on the data information indexed by the tape defective section search function, the video can be selected to reproduce only the normal section of the tape and play only the selected portion in succession during the PLAY. It is an object of the present invention to provide a video cassette recorder having an automatic movement and playback of the tape section.

1 is a block diagram for explaining a playback operation of a conventional video cassette recorder (VCR).

Fig. 2 is a waveform diagram for explaining and comparing output waveforms of a video signal according to a playback state during tape playback.

Fig. 3 is a block diagram showing a video cassette recorder equipped with an automatic moving playback function of a normal section of a video tape according to an embodiment of the present invention.

Fig. 4 is a diagram illustrating the output state of the OSD subtitle for guiding the reproduction result by the normal section index of the tape.

Explanation of symbols on the main parts of the drawings

1,31: Remote control device 2,32: Receiver

3, 33: system controller 4: supply reel

5: Rewind 6: Head for recording / playback

7: R / P head drive unit 8: switching unit

9: recording signal processing stage 9a: Y-C separation unit

9b: FM modulation circuit 9c: Frequency low-frequency conversion circuit

9d, 20f: Mixer 14,20g, 31: Amplifier

20: playback signal processing stage 20a: preamplifier

20b: HPF (High Pass Filter) 20c: FM demodulation circuit

20d: LPF (Low Pass Filter) 20e: Frequency High Frequency Conversion Circuit

30: CTL head drive unit 31: amplification unit

32: waveform shaping circuit 34: pulse judgment unit

HD1: CTL Head HD2: Audio Head

A video cassette recorder having an automatic movement playback function of a normal section of a video tape according to the present invention for realizing the above object is provided with a video and audio head 6 for reading video and audio signals recorded in a contracted area of the video tape. HD2), playback signal processing sections 20 and 14 for processing playback signals read out by the video and audio heads 6 and HD2, and providing power for transferring the tape at a predetermined speed during playback / recording. A video cassette recorder comprising: a capstan motor 34; and a capstan driver 35 for driving control of the capstan motor 34 to a predetermined control signal; Key input sections 31 and 32 for inputting a normal section selective playback function execution command, a CTL head HD1 for reading a CTL signal recorded in a contracted section of a video tape during a playback operation, and the CTL head HD1. The pulse judging unit 34 detects the duty ratio of the signal read out by the ") and outputs a level signal corresponding to the detected duty ratio, and the index data recorded at the start point and the end point of the tape defect section. Index data information storage unit 37 for storing the duty ratio determination criteria for the data as the data, and when the normal section selection playback function is selected through the key input units 31 and 32, the index data information storage is performed while executing the normal playback operation. And a control unit 33 for searching for a level signal applied from the pulse determining unit 34 on the basis of the data set in the unit 37, and controlling the fast playback at a predetermined double speed for the tape defective state determination section. Characterized in that comprised over.

That is, according to the present invention having the above-described configuration, by selecting only the region having good recording condition when playing the tape, the corresponding sections can be played in succession, so that even in the case of the damaged tape, the same effect can be used as the normal product. You get

Hereinafter, with reference to the accompanying drawings will be described an embodiment according to the present invention.

FIG. 3 is a block diagram showing an internal configuration of a video cassette recorder having an automatic moving playback function of a normal section of a video tape according to an embodiment of the present invention, wherein the components perform substantially the same functions as those shown in FIG. Are denoted by the same reference numerals and detailed description thereof will be omitted.

In FIG. 3, reference numeral HD1 denotes a CTL head which records and reads a CTL signal which is the basis of head switching for a contracted section of the video tape, and reference numeral 30 denotes a CTL according to a control command from the system controller 33. CTL head drive unit for driving control of the head HD1, 31 is an amplifying unit for amplifying a signal read by the CTL head HD1, 32 is a CTL signal amplified to a predetermined level by this amplifying unit 31 A waveform shaping circuit for shaping a square wave, and 34 is a pulse plate for detecting a duty ratio with respect to a square wave shaped CTL signal output from the waveform shaping circuit 32 and outputting a level signal corresponding to the detected duty ratio. Government.

Further, reference numeral 34 denotes a capstan motor that provides power for transferring the tape at a predetermined speed when the tape is replayed / recorded, rewound, or rewound, and 35 denotes a capstan motor for driving control of the capstan motor 34 to a predetermined control signal. It is a driving unit.

On the other hand, reference numeral 31 is a remote control device further provided with a function key (not shown) for selecting the normal section selection playback function, 32 receives the infrared signal transmitted from the remote control device 31 and transmits it. The receiving unit 33 converts and outputs the conventional code signal, and 33 is a system controller as a control unit for controlling the operation of the entire apparatus including the normal section sorting and reproducing function based on the code signal applied from the receiving unit 32.

Reference numeral 36 denotes a flag register for storing and setting predetermined state data indicating that the corresponding function is selected when the user selects the normal section selection reproducing function through the remote control device 31, and 37 indicates the start of the tape failure section. Index data information storage unit for storing the duty ratio determination criteria for the index data recorded at the point and the end point as data, reference numeral 26 denotes the start of the tape failure section in accordance with a predetermined control command from the system controller 33; The OSD generator for guiding the index result according to the detection of the point and the end point, 27 is a mixer which mixes the OSD pattern signal generated by the OSD generator 26 with the playback video signal and outputs it through the video signal output terminal. .

Next, the operation of the device having the above configuration will be described.

When the tape bad section indexing function is executed to load a video tape in the deck in which index data contracted at the start point and the end point of the bad section are recorded, the user is provided with the remote control device 31. When the section selection regeneration function key (not shown) is selected, the system controller 33 sets the state data level of the flag register 36 to '01', for example, so that the normal section selection regeneration function is performed by the user. At the same time, it records the selected state and executes a normal playback operation to output video and audio signals according to tape playback through the video output terminal P _out2 and the audio output terminal P _out1 , respectively.

On the other hand, the CTL head HD1 reads the CTL signal recorded in the contracted area of the tape during the reproducing operation. The read CTL signal is amplified to a predetermined level through the amplifier 31. Subsequently, the waveform shaping circuit 32 converts the signal into a square wave form signal and inputs it to the pulse determining unit 34.

The pulse determining unit 34 calculates a duty ratio of the square wave signal applied from the waveform shaping circuit 32 and outputs a determination signal having a level corresponding to the duty ratio to the system controller 33. (33) retrieves the level data applied from the pulse judgment unit 34 based on the stored data of the index data information storage unit 37, so that every time the reproduction operation is performed, for example, a 4: 6 duty ratio is obtained. It is confirmed whether the start position of the tape failure section recorded as the CTL signal is detected.

On the other hand, if the level data applied from the pulse determining unit 34 is determined to be the same data as the code data set as the start point of the defective section in the index data information storage unit 37 during the reproduction operation, the system controller ( 33) changes the rotation speed of the capstan motor 34 and the like to switch from the normal regeneration operation state to the 3 times regeneration operation state.

The system controller 33 retrieves the data applied from the pulse determining unit 34 during the 3x fast reproducing operation, and sets a code set as the end position data of the tape failure section in the index data information storing unit 37. Is detected, the system controller 33 stops the 3x fast playback operation being executed and switches to the normal play function when the corresponding code indicating the end position of the defective section is detected. The playback operation for the tape normal section is resumed.

On the other hand, the normal section sorting and playback function performed by the above-described procedure is repeatedly executed until the end of the tape is completed and the playback operation is automatically stopped or the playback operation is stopped by the user. The playback screen of the section is displayed on the screen as a normal state, and the playback screen of the section with a bad tape condition is quickly passed, so that if the tape defective section is not too long, the playback screen of the normal section is played back naturally. It is possible to obtain the same image quality as that shown.

That is, according to the above embodiment, the video having the automatic section playback function of the normal section of the video tape which enables the tape playback to be executed only for the normal section during the PLAY operation based on the data information indexed by the tape section section search function. A cassette recorder can be realized.

On the other hand, the present invention is not limited to the above embodiments and can be modified in various ways without departing from the technical gist of the present invention.

As described above, according to the present invention, when the tape is played back, only the region having a good recording state is selected, and the corresponding sections can be played in succession, so that even in the case of a damaged tape, the same effect can be used as the normal product. .

Claims (3)

Video and audio heads 6 and HD2 for reading video and audio signals recorded in a contracted area of the video tape, and playback signals for processing playback signals read out by the video and audio heads 6 and HD2. Processing unit 20, 14, capstan motor 34 for providing power for transferring the tape at a predetermined speed during the playback / recording, and the capstan drive unit 35 for driving control of the capstan motor 34 to a predetermined control signal In the video cassette recorder is provided; A key input unit (31, 32) for inputting an instruction to execute the normal section sorting / playback function; A CTL head HD1 for reading out the CTL signal recorded in the contracted section of the video tape during the playback operation; A pulse judgment unit 34 which detects a duty ratio of a signal read out by the CTL head HD1 and outputs a level signal corresponding to the detected duty ratio, An index data information storage unit 37 for storing, as data, a duty ratio discrimination criterion for index data recorded at a start point and an end point of a tape failure section; and When the normal section selection regeneration function is selected through the key input units 31 and 32, the level applied from the pulse determination unit 34 is executed based on the data set in the index data information storage unit 37 while executing the normal regeneration operation. And a control unit (33) for retrieving a signal and controlling a fast playback at a predetermined double speed for a tape failure state determination section. The method of claim 1; A flag register 36 is further provided to store and set the state data of the first level indicating that the corresponding function is selected when the normal section selection regeneration function is selected through the key input unit. The control section 33 controls the normal section selection playback function to be automatically executed when a playback command is input in a state where the first level state data is set in the flag register 36. Video cassette recorder with automatic moving playback. The method of claim 1 or 2; An OSD generator 26 for generating and outputting a predetermined OSD pattern signal for guiding a user with an index result according to detection of a start point and an end point of a tape failure section according to a predetermined control command from the controller 33; And a mixer 27 for mixing the OSD pattern signal generated by the generation unit 26 with the reproduced video signal and outputting the same through the video signal output terminal. Video cassette recorder.