JPH06215540A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent the occurrence of waveform distortion of VITC signals on video signals during an editing operation by providing an input VITC reading means which reads VITC of the video signals from a video signal input section. CONSTITUTION:Reproduced video signals 116 and input video signals 123 inputted from a video signal input section 124 are switched over by a VITC switchover section 117 and the VITC signals are decoded by a VITC read section 118. Moreover, a decision is made to set a priority to either reproduced VITC value 119 or reproduced LTC value 112 as the reproduced value to be synchronized and continuous, or to select the value, which is set by a time code initial value setting section 121 as a generated initial value, as the initial value. Furthermore, VITC signals 131 are generated by a VITC signal generation section 130 and are sythesized with the input video signals 123 at a video signal.VITC signal synthesis section 132. And waveform formed VITC are re-recorded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus capable of recording / reproducing information on VITC.

[0002]

2. Description of the Related Art In recent years, editing accuracy has been regarded as important in editing systems, and editing using time codes has become the mainstream.

The above-mentioned time code editing technique will be described below with reference to the drawings.

FIG. 2 is a block diagram of a conventional time code. 201 is a magnetic tape, 202 is a voice head, 203 is an audio signal, and 204 is LTC.
An audio switching unit 205 is an audio circuit. 206 is an LTC recording / reproduction switching unit, 207 is a reproduction LTC signal, 208 is an input time code signal, 209 is a time code input unit, 210 is an LTC switching unit, and 211 is LTC.
A value reading unit, and 212 is a reproduction LTC value. Two
Reference numeral 13 is a video head, 214 is a recording / playback video signal, 215 is a video recording / playback switching section,
Reference numeral 16 is a reproduced video signal, 217 is a VITC value reading unit, and 218 is a reproduced VITC value. Reference numeral 219 is a time code switching unit, 220 is a time code initial value setting unit, and 221 is a time code generation calculation unit. Reference numeral 222 is an input video signal, and 223 is a video signal input unit. 224 is a time code generation value,
225 is an LTC signal generator, and 226 is a recording LTC
227 is a time code output section,
Reference numeral 8 is an output time code signal. 229 is a VITC signal generator, 230 is a VITC signal, and 231
Is a video signal / VITC signal combining unit. Reference numeral 232 is a recorded video signal, 233 is a video signal output unit, and 23
Reference numeral 4 is an output video signal.

In the above structure, the LTC signal obtained by switching the audio signal 203 on the magnetic tape 201 by the LTC / audio switching unit 204 and the input time code signal 208 input from the time code input unit 209 are L level.
The TC switching unit 210 switches, and the LTC value reading unit 211 decodes the LTC signal. Also, the reproduced video signal 2
16 is decoded by the VITC value reading unit 217. Also,
The time code switching unit 219 causes the reproduction VITC value 218 and the reproduction LTC value 2 immediately before the recording on the tape to start.
12, which reproduction value is synchronized with the continuous value is given priority, or the initial value is the value set by the time code initial value setting unit 220 as the generation initial value, and the time code generation calculation unit 221 determines the time. The code generation value 224 is calculated. According to the time code generation value, the LTC signal generation unit 225 generates the recorded LTC signal 226, and the time code output unit 227 outputs the output time code signal 228. Further, the VITC signal generation unit 229 generates the VITC signal 230, and the video signal / VITC signal synthesis unit 231.
Is combined with the input video signal 222. The image is recorded as a recorded image signal 232 and an image signal output unit 233 is recorded.
The image is output as the output image signal 234.

Since the VHS (registered trademark) and S-VHS (registered trademark) formats do not have the dedicated track for the LTC, they use the track of channel 2, which is one of the audio channels. However, the LTC cannot be read during slow playback and still playback. In addition, it is often the case that audio is used in two channels, and it has become impossible to edit the time code only with LTC. Therefore, it is the current situation that time code editing with VITC is required. .

[0007]

However, in the above-mentioned conventional magnetic recording / reproducing apparatus, when the editing operation is performed, the VITC signal on the video signal is re-recorded as it is.
There is a problem that waveform distortion occurs in VITC due to the characteristics of the tape head system.

In view of the above problems, it is an object of the present invention to provide a magnetic recording / reproducing apparatus capable of preventing waveform distortion of a VITC signal on a video signal and improving editing accuracy when performing an editing operation. To do.

[0009]

In order to solve the above problems, according to the present invention, a VITC input from a video signal input section is used.
An input VITC reading means for reading, a time code generating means for generating a recording time code, a time code setting means for setting the recording time code signal with an output signal of the input VITC reading means at the start of recording, and the recording time code. V to make recorded VITC signal from signal
The ITC signal generator, the video signal VITC signal synthesizer for synthesizing the video signal input from the video signal input unit and the recording VITC signal, and the output signal of the video signal VITC signal synthesizer are used as the video signals of the magnetic tape. And a video recording unit for recording on a track.

[0010]

When the editing operation is performed by the above means,
The waveform-formed VITC is re-recorded by synchronizing the VITC value of the input video signal with the time code generation value of the VITC to be recorded.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 shows a block diagram of an embodiment of the present invention. In FIG. 1, 101 is a magnetic tape, 102 is a voice head, 103 is an audio signal, 104 is an LTC / audio switching unit, and 105 is an audio circuit. 106 is LTC
A recording / playback switching unit 107 is a playback LTC signal, 108 is an input time code signal, and 109
Is a time code input unit, 110 is an LTC switching unit, 111 is an LTC value reading unit, 112
Is the reproduced LTC value. 113 is a video head, 11
Reference numeral 4 is a recording / playback video signal, 115 is a video recording / playback switching unit, 116 is a playback video signal, and 1
Reference numeral 17 is a VITC switching unit, 118 is a VITC value reading unit, and 119 is a reproduction VITC value. 1
20 is a time code switching unit (input VITC / input L
It switches TC / VITC / LTC), and 121
Is a time code initial value setting unit, and 122 is a time code generation calculation unit. 123 is an input video signal,
Reference numeral 124 is a video signal input unit. 125 is a time code generation value, 126 is an LTC signal generation unit, 12
Reference numeral 7 is a recording LTC signal, 128 is a time code output section, and 129 is an output time code signal. Thirteen
Reference numeral 0 is a VITC signal generation unit, 131 is a VITC signal, 132 is a video signal / VITC signal combination unit, 133 is a recording video signal, 134 is a video signal output unit, and 135 is an output video signal. Is.

The operation of the magnetic recording / reproducing apparatus configured as described above will be described with reference to FIG.

First, the LTC signal obtained by switching the audio signal 103 on the magnetic tape 101 by the LTC / audio switching unit 104 and the input time code signal 108 input from the time code input unit 109 are switched by the LTC switching unit 110, and the LTC is switched. LT in the value reading unit 111
Decode C signal. In addition, the reproduced video signal 116 and the input video signal 123 input from the video signal input unit 124 are set to V
The ITC switching unit 117 switches and the VITC reading unit 118 decodes the VITC signal. In addition, the time code switching unit 120 instructs switching of the LTC switching unit 110 and the VITC switching unit 117, and which of the reproduction value of the reproduction VITC value 119 and the reproduction LTC value 112 is synchronized and a continuous value is given priority. Alternatively, it is determined whether the value set by the time code initial value setting unit 121 is set as the initial value as the generation initial value, and the time code generation calculation unit 122 calculates the time code generation value 125.
The LTC signal generator 126 generates a recorded LTC signal 127 according to the time code generation value, and the time code output unit 1
An output time code signal 129 is output from 28. Further, the VITC signal generator 130 generates the VITC signal 131, and the video signal / VITC signal combiner 132 combines the input video signal 123. The video is recorded video signal 13
3, and the video signal is output from the video signal output unit 134 as the output video signal 135.

As described above, according to the present embodiment, in the magnetic recording / reproducing apparatus, when the recording operation and the editing operation are performed, the time code which is the absolute address on the magnetic tape is used, and the VITC value of the input video signal is used. , Or the LTC value input from the time code input section, VITC and L
VITC and LT on the magnetic tape in which the time code generation value of TC is synchronized or the time code is recorded
It can be selected to synchronize with the time code value of C, and the continuity of the time code values of VITC and LTC on the magnetic tape after editing can be ensured. Further, since the VITC and LTC are re-recorded after being waveform-shaped, the waveform distortion of the VITC signal and the LTC signal on the video signal at the time of dubbing can be prevented and the editing accuracy can be easily improved.

[0016]

As described above, according to the present invention, by having the input VITC reading means for reading the VITC of the video signal input from the video signal input section, the VITC of the input video signal can be obtained when the editing operation is performed. It is possible to prevent waveform distortion due to dubbing when the value of is selected as the time code generation value.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a magnetic recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram showing the configuration of a conventional magnetic recording / reproducing apparatus.

[Explanation of symbols]

 101 magnetic tape 102 audio head 104 LTC / audio switching unit 105 audio circuit 106 LTC recording / playback switching unit 109 time code input unit 110 LTC switching unit 111 LTC value reading unit 113 video head 115 video recording / playback switching unit 117 VITC switching unit 118 VITC value reading unit 120 time code switching unit 121 time code initial value setting unit 122 time code generation / calculation unit 124 video signal input unit 126 LTC signal generation unit 128 time code output unit 130 VITC signal generation unit 132 video signal / VITC signal combination Section 134 Video signal output section

Claims (2)

[Claims] 1. A VITC input from a video signal input section
(Vertical Interval Time Co
de) input VITC reading means, time code generating means for generating a recording time code, time code setting means for setting the recording time code signal with an output signal of the input VITC reading means at the start of recording, and the recording A VITC signal generator for generating a recorded VITC signal from a time code signal, a video signal VITC signal combiner for combining the video signal input from the video signal input unit with the recorded VITC signal, and the video signal VITC.
A magnetic recording / reproducing apparatus comprising: a video recording unit for recording the output signal of the signal synthesizing unit on a video track of a magnetic tape. 2. A VITC (Vertical Interval Ti) recorded on a video track of a magnetic tape.
(me code) for reproducing VITC reading means, input VITC reading means for reading VITC input from the video signal input section, and LTC (Longitudina) recorded on a longitudinal track on the magnetic tape.
Reproduction LTC reading means for reading (1 Time Code) and the LT input from the time code signal input section.
An input LTC reading means for reading C, a time code initial value setting means, a time code generating means for generating a recording time code signal, the recording time code signal at the start of recording, the output signal of the reproducing VITC reading means or the Time for instructing which of the output signal of the input VITC reading means, the output signal of the reproduction LTC reading means, the output signal of the input LTC reading means, or the initial value signal set by the initial value setting means is set. A code switching instruction section and a VITC for producing a recording VITC signal from the recording time code
A video signal VI for synthesizing a signal generation unit, the video signal input from the video signal input unit and the recording VITC signal
A TC signal synthesizing section, an LTC signal generating section for producing a recorded LTC signal from the recording time code signal, and the video signal V
A video recording unit for recording the output signal of the ITC signal synthesizing unit on the video track of the magnetic tape, and an LT for recording the recording LTC signal on the longitudinal track on the magnetic tape.
The magnetic recording / reproducing apparatus according to claim 1, further comprising a C recording unit.