JPH05135552A - Magnetic recording/reproducing device - Google Patents

Abstract

PURPOSE:To improve the video retrieving efficiency in a reproduction state by recording the date and the time as the time code value with the use of time codes. CONSTITUTION:This device is provided with a VITC reading part 105 to read the VITC recorded on a magnetic tape a control signal computing part 112 which interpolates the VITC with the control signal that undergone the waveform shaping through a control signal amplifying part 108 if the VITC could not read at the part 105 and then counts the control signals, and a time code decoding/discriminating part 122. Furthermore the device has an operating command/time code initial value operating part 125, a present time computing/ control part 120 which computes the present time through a present time setting part 114 and a crystal oscillation circuit 118, a time code producing/computing part 126, a time code mode setting part 124, and a video signal/VITC signal synthesizing part 137. Then it is selected in a recording mode whether the time code generation value is set equal to the value set an initial value setting part or the initial value which is synchronous with the present time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a time code, which is an absolute address on a magnetic tape, when recording a time code in a field that particularly requires a time date required for a surveillance recording system. It is possible to select whether the generated value of the time code is the value set in the initial value setting section or the value synchronized with the current time is the time code value. The present invention relates to a magnetic recording / reproducing apparatus capable of easily confirming the date and time of a given time by a time code value.

[0002]

2. Description of the Related Art In recent years, in surveillance recording and observation recording represented by a security system, the date and time when the image is recorded have been very important.

The above-mentioned recording technique of the current time will be described below with reference to the drawings. FIG. 2 is a configuration diagram related to the conventional recording of the current time. Reference numeral 201 is an input video signal, and 202 is a video signal input unit. 203 is a VTR
Is a drive / control unit of. Reference numeral 204 is a current time setting unit, 205 is a current time setting signal, and 206 is means for setting the current time. Reference numeral 207 is a crystal oscillation circuit, 208 is an oscillation clock signal, 209 is a current time calculation / control unit, and 210 is a current time signal.
Reference numeral 211 is a recording video signal, 212 is a time date superimposing unit, 213 is a recording video signal with a time date superimposed, and 214 is a video recording unit. Reference numeral 215 is a reproduction control signal, 216 is a video reproduction unit, and 217 is a reproduction video signal. 218 is a video signal output unit,
Reference numeral 219 is an output video signal.

In the above configuration, the current time setting section 204
With the current time setting signal 205, the time set in
The means 206 for setting the current time sets the initial setting time,
After that, the crystal oscillation circuit 207 causes the oscillation clock 208
With reference to, the current time calculation / control unit 209 converts the current time into time. The time date superimposing unit 212 superimposes the current time signal 210 on the input video signal 201 input by the video signal input unit 202. At the time of recording by the magnetic recording / reproducing apparatus, the recorded video signal 213 on which the time date is superimposed is recorded by the video recording unit 214, and is output as the output video signal 219 from the video signal output unit 218.

Under the present circumstances, a time date is superposed on a part of a recorded video signal to record the current time, and at the time of reproduction, the time date is checked by checking the time date.

[0006]

The problem to be solved is that the time date is superimposed on the video signal when confirming when the recorded video is recorded. I can't confirm. In addition, it is not possible to confirm the image of the portion on which the time date is superimposed.

In view of the above problems, the present invention uses a time code, which is an absolute address on a magnetic tape, as a time date required for a surveillance recording system, and when the time code is recorded, the time code is recorded. It is possible to select whether the generated value of is the value set in the initial value setting part or the value synchronized with the current time is the time code value, and the image was recorded in the image search after recording. (EN) A magnetic recording / reproducing device capable of easily confirming date / time by a time code value.

[0008]

In order to solve the above-mentioned problems, according to the present invention, a waveform is generated in a VITC reading section for reading a VITC recorded on a magnetic tape during reproduction and a control signal amplifying section when the VITC cannot be read. Equipped with a control signal calculation unit that interpolates and counts with a shaped control signal and a time code decoding determination unit,
Further, the operation command / time code initial value operation unit, the current time setting unit, and the crystal oscillation circuit calculate the current time. The current time calculation / control unit, the time code generation calculation unit, and the time code generation conditions are the operation command / time code. The time code mode setting unit is provided for selecting whether to use the time code value set by the initial value operation unit or the current time calculated by the current time calculation / control unit as a time code value. It has a VITC signal generation section that uses the code generation value as the VITC signal and a video signal / VITC signal synthesis section that synthesizes the video signal and VITC signal. It is provided with a configuration for selecting a set value or a value synchronized with the current time as an initial value.

[0009]

With the above means, when the time code required for the surveillance recording system is recorded by using the time code which is the absolute address on the magnetic tape, the generated value of the time code is initialized. You can select whether to use the value set in the value setting section or the time code value that is synchronized with the current time, and the date and time when the video was recorded in the video search after recording. It can be easily confirmed by the code value.

[0010]

Embodiments of the present invention will be described below with reference to FIG.

FIG. 1 is a block diagram of an embodiment of the present invention. In FIG. 1, 101 is a video head, 102 is a recording / playback video signal, and 103 is a video recording / playback switching unit. 104 is a reproduced video signal, and 105 is a VITC value reading unit. Reference numeral 106 is a control head, 107 is a control signal, 108 is a control signal amplifier, and 10
Reference numeral 9 is a control signal whose waveform has been shaped. Reference numeral 110 is a switching unit for recording / reproducing, and 111 is a pseudo control signal generating unit. Reference numeral 112 is a control signal calculation unit, and 113 is a control value. Reference numeral 114 is a current time setting unit, 115 is a current time setting signal, and 116 is means for setting the current time. Reference numeral 117 is an initial setting time signal, 118 is a crystal oscillation circuit, and 119 is an oscillation clock. Reference numeral 120 is a current time calculation / control unit that calculates time based on the initial setting time 117, and 121 is a current time signal. 122
Is a time code decoding determination unit, and 123 is a reproduction time code value. 124 is a time code mode (date,
Reference numeral 125 is an operation command / time code initial value operation unit, and 126 is a time code generation / calculation unit. Reference numeral 127 is an input video signal, 128 is a video signal input section, and 129 is a drive / drive.
It is a control unit. 130 is a time code generation value, which is 1
31 is a display control unit, 132 is display data,
133 is a display tube. Reference numeral 134 is a VITC signal generation unit, 135 is a VITC signal, 136 is a video signal, and 137 is a video signal / VITC signal combination unit. Reference numeral 138 is a video signal output unit, and 139 is an output video signal. Reference numeral 140 is a full width erasing head. Reference numeral 141 is an audio track channel 2, 142 is an audio guard bank, 143 is an audio track 1, 144 is a video track, 145 is a control track, and 146 is an audio head.

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

First, the VITC value reading unit 105 determines from the reproduced video signal 104 whether or not the VITC can be read correctly. The control signal 107 traced from the control track 145 by the control head 106 is waveform-shaped by the control signal amplifying section 108, and becomes a waveform-shaped control signal 109. The magnetic recording / reproducing apparatus switches between the control signal output from the pseudo control signal generating section 111 and the control signal on the tape pattern by the switching section 110 depending on whether recording or reproducing is being performed. The control signal is calculated by the control signal calculation unit 112,
It becomes the control value 113. When the VITC cannot be read by the time code decoding determination unit 122, CTL interpolation is performed with the control value to obtain the reproduction time code value 123. Further, the means 116 for setting the current time from the current time setting section 114 becomes the initial time signal 117 in the means 116 for setting the current time and is sent to the current time calculation / control section 120. Thereafter, with reference to the oscillation clock 119 of the crystal oscillation circuit 118, the initial setting time signal 1
Based on 17, the current time signal 121 is calculated by time conversion. In addition, time code mode (sync with date / time /
The current time signal 12 is set by the setting unit 124 in synchronization with the set value.
1 or, as the generation initial value, it is determined whether the value set by the operation command / time code initial value operation unit 125 is used as the initial value, and the time code generation calculation unit 126 calculates the time code generation value 130. Depending on the time code generation value, V
The ITC signal generation unit 134 generates the VITC signal 135, and the video signal / VITC signal synthesis unit 137 generates the video signal 1
And 36. The video is recorded and the video signal output unit 138 outputs the video as an output video signal 139.

As described above, according to this embodiment, in the magnetic recording / reproducing apparatus, the time code required for the monitoring recording system is recorded by using the time code which is the absolute address on the magnetic tape. You can choose whether to set the time code generation value to the value set in the initial value setting section or to set the time code value to the value synchronized with the current time. In the above, the date and time when the video was recorded can be easily confirmed by the time code value.

[0015]

As described above, according to the present invention, the VITC reading section for reading the VITC recorded on the magnetic tape during reproduction and the control signal having the waveform shaped by the control signal amplifying section when the VITC cannot be read. It is equipped with a control signal operation unit that interpolates and counts with a time code decoding determination unit, and further includes an operation command / time code initial value operation unit, a current time setting unit, and a current time operation / control unit that calculates the current time by a crystal oscillation circuit The time code generation / calculation section and the time code generation condition are set to the time code value set in the operation command / time code initial value operation section, or the current time calculated in the current time calculation / control section is set to the time code. A time code mode setting unit for selecting whether to use the value, and Video signal · VITC synthesizing the VITC signal generation unit and the video signal and the VITC signal to C signal
When the recording operation is performed, the time code generation value is set to the value set in the initial value setting section, or
Alternatively, it is possible to select whether to set a value synchronized with the current time as an initial value.

[Brief description of drawings]

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

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

[Explanation of symbols]

 105 VITC value reading unit 112 control signal calculation unit 113 control value 114 current time setting unit 120 current time calculation / control unit 121 current time signal 122 time code decoding determination unit 123 playback time code value 124 time code mode setting unit 125 operation command / Time code initial value operation unit 126 Time code generation / calculation unit 131 Display control unit 132 Display data 133 Display tube 134 VITC signal generation unit 135 VITC signal 136 Video signal 137 Video signal / VITC signal combination unit 138 Video signal output unit 139 Output video signal

Claims (1)

[Claims] 1. A VITC (Ver) recorded on a magnetic tape.
(Tial Interval Time Code)
VITC reading section for reading during playback and the VITC
If the control signal is not read, it is equipped with a control signal calculation unit that interpolates and counts with the control signal whose waveform has been shaped by the control signal amplification unit, and a time code decoding determination unit. And the current time calculation / control unit that calculates the current time by the crystal oscillation circuit, the time code generation calculation unit, and the time code generation condition are the time code values set in the operation command / time code initial value operation unit, Alternatively, there is provided a time code mode setting section for selecting whether to use the current time calculated by the current time calculation / control section as a time code value, and a VITC signal generating section and a video signal for setting the time code generation value as a VITC signal. When performing a recording operation, it has a video signal / VITC signal combining unit that combines the A magnetic recording and reproducing apparatus characterized by comprising an arrangement for selecting whether a value of the generated value set by the initial value setting unit of the time code, or a value in synchronization with the current time as the initial value.