JPH054684U - High-definition TV signal built-in VTR - Google Patents

Abstract

(57) [Abstract] [Purpose] VTR with built-in converter that converts MUSE signal so that it can be received by the current NTSC TV receiver.
In (1), one of the zoom mode and the wide mode is selected and output from the video output terminal, and in the recording state, the wide mode is automatically recorded. [Structure] The output of the MUSE / NTSC converter 7 is selected by the input switch SW1 and applied to the MUSE / NTSC converter 7, and the switch SW3 for switching the conversion mode of the MUSE / NTSC converter 7 and the signal REC indicating the recording state are connected. The output of the OR gate 12 is MUS
By applying the signal to the E / NTSC converter 7, when the signal REC is generated, the MU is turned on regardless of the switch SW3.
The SE / NTSC converter 7 is switched to wide mode conversion.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention is a high-quality TV signal (hereinafter referred to as MUSE signal) to a normal TV signal ( The present invention relates to a VTR having a built-in converter for converting into an NTSC signal).

[0002]

[Prior art]

  High-definition TV, so-called high-definition TV It has the same high image quality as mm film and is expected to be used as a video media for movies and medical applications. I have been waiting.

[0003]   The HDTV standard is 1125 scanning lines and the current NTSC 525 lines. It is about twice as large as that of the above, and the aspect ratio of the screen (hereinafter referred to as the aspect ratio) is 9: 1. 6 is wider than the current TV's 3: 4, and it is more likely to be It has the characteristic to switch.

[0004]   Therefore, high-definition images with such excellent characteristics can be displayed on current TV receivers. There is a strong desire to play it back in the Have been proposed from.

[0005]   In this MUSE / NTSC converter, both types of scanning as described above are performed. Conversion is done to convert lines and aspect ratio differences, especially for aspect ratio Regarding conversion, the following two methods are known.

[0006]     (1) Delete both sides of the 9:16 high-definition image and change the aspect ratio to 3: 4. Zoom mode to convert to display on the screen.

[0007]     (2) Display a 6:16 high-definition image as it is on a 3: 4 screen Wide mode to convert like.

[0008]   Each of these two conversion modes has its advantages and It is desirable that these two conversion modes can be switched appropriately.

FIG. 3 shows a block diagram of a configuration of a conventional MUSE / NTSC converter having such two conversion modes. HDTV picture signal, MUSE (Multiple S ub-Nyquist -Sampling Encoding) and transmitted is band compressed to 8.1MH _Z in bandwidth compression scheme called, this MUSE analog input, A / D converter 1 Digitally converted at. The wide-zoom signal processing unit 2 performs a predetermined signal processing on the digitally converted MUSE signal, and the D / A converter 3 converts the MUSE signal into an analog signal again and outputs the analog signal. In this configuration, the PLL circuit 4 that creates a MUSE clock signal by the synchronization signal included in the MUSE digital signal, and the PLL circuit that creates the NTSC zoom mode clock signal and wide mode clock signal by the MUSE clock signal The circuit 5 and the PLL circuit 6 are provided, and the clock signal is switched by switching between the zoom mode and the wide mode.

[0010]   When such a MUSE / NTSC converter is built into the VTR, the user One of the selected video signals in zoom mode and wide mode is a video recording signal processing circuit , And recording is performed depending on the mode.

[0011]

[Problems to be solved by the device]

  Thus, in the conventional VTR with a built-in converter, the zoom mode and wide Zoom to switch and process mode conversions and record by its output If the mode is selected, you may not be able to record the full screen, which may cause inconvenience. Had.

[0012]

[Means for Solving the Problems]

  The present invention was created in view of the above-mentioned points, and a video signal is recorded on a magnetic tape. Video recording signal processing circuit for recording the video signal, and the video recorded on the magnetic tape A video reproduction signal processing circuit for reproducing a signal and a high quality TV signal are applied, In order to display a high quality TV signal with a fixed aspect ratio on a TV screen with an aspect ratio of 3: 4 The high-definition TV signal is trimmed to an aspect ratio of 3: 4 and the number of scanning lines and time axis are set. The first function of converting the high-quality TV signal and the high-quality TV signal are kept at a predetermined aspect ratio, and the aspect ratio is 3: 4. Conversion of scanning lines and time axis of the high-quality TV signal for display on the TV screen of No. 4 High-definition TV signal conversion circuit in which the second function for performing is switched based on the control signal. Channel, normal TV signal, externally applied video signal, and high-quality TV signal conversion An input switching switch that selects the converted output of the circuit and applies it to the video recording signal processing circuit. Switch and before switching the first function and the second function of the high quality TV signal conversion circuit. The mode selection means for outputting a control signal, and The output of the mode selection means is forcibly set to a predetermined signal, and the high quality TV signal conversion circuit is provided. And a control circuit having the second function as a second function, the second circuit is always provided in the recording state. Recording is performed with the converted output signal by the function of.

[0013]

[Action]

  According to the above-mentioned means, a high quality TV signal conversion circuit (MUSE / NTSC converter The conversion operation of (1) is switched to the first function, that is, the zoom mode. Also, when the VTR is set to the recording state, the output of the control circuit causes the high quality TV signal conversion circuit. Function is automatically switched to the second function, depending on the wide mode video signal Recording is done.

[0014]

【Example】

  FIG. 1 is a block diagram showing a first embodiment of the present invention. BS tuner Is an analog MUSE signal sent from a high definition VTR, etc. The video signal applied to the NTSC converter 7 and converted is an input selector switch It is applied to SW1. Further, the tuner 8 is a receiving circuit for receiving a normal TV signal. Yes, the video signal is also applied to the input changeover switch SW1. In addition, external These video signals are input to the input selector switch SW1 by the external input line LINE. Is applied. The input selector switch SW1 is a tuner 8, LINE or M Video recording signal by selecting any of the video signals of the USE / NTSC converter 7 A switch SW for applying to the processing circuit 9 and outputting as a monitor output 2 is applied.

[0015]   The video recording signal processing circuit 9 records the video signal on the magnetic tape in the recording state. Is a circuit that performs signal processing for output, and its output is supplied to the rotary head 10. Be done. On the other hand, in the playback state, the signal extracted from the rotary head 10 is It is applied to the reproduction signal processing circuit 11 and reproduced as a video signal, and is applied to the switch SW2. Is applied. The switch SW2 is connected to the contact “a” in the reproducing state to reproduce the image. The video signal of the signal processing circuit 11 is output from the video output terminal. Other than the playback state, The switch SW2 is connected to the contact b, and is connected by the input changeover switch SW1. The selected video signal is output from the video output terminal.

[0016]   On the other hand, the MUSE / NTSC converter 7 is similar to the converter shown in FIG. And the two conversions of the zoom mode and the wide mode depending on the control signal W / Z. The method can be switched. This control signal W / Z is an OR gate which acts as a control circuit. The output of the selector switch SW3 is output to the input of the OR gate 12. A signal REC indicating the force and the recording state is applied. Changeover switch SW3 is VT This is a switch for the R user to select between zoom mode and wide mode. When switched to the side, the output of the OR gate 12 becomes L level and the zoom mode is selected Then, when it is switched to the H level side, the output of the OR gate 12 becomes the H level. Wide mode is selected. In addition, the signal REC is at the H level when the recording state is set. Then, the output of the OR gate 12 which is concerned with the contact of the switch SW3 becomes H level. Therefore, the wide mode is selected for the MUSE / NTSC converter 7.

[0017]   Therefore, according to the VTR shown in FIG. 1, the switch SW3 The converted output of the MUSE / NTSC converter 7 output from the video output by You can select between zoom mode and wide mode, and zoom with switch SW3. Even if the mode is selected, MUSE / NTSC is activated when the recording mode is set. Since the converter 7 performs wide mode conversion, the wide tape is recorded on the magnetic tape. Recording is done.

[0018]   FIG. 2 is a block diagram showing a second embodiment of the present invention. In the figure, as in FIG. The same parts are designated by the same reference numerals and the description thereof is omitted. The feature of this embodiment is that M The USE / NTSC converter has a wide mode converter 13 and a zoom mode converter. It is configured by two systems of the inverter 14. And wide mode converter The conversion output of the switch 13 is connected to the contact c of the input selector switch SW1 and The output of switch SW1 is connected to the contact a of switch SW4, and the output of switch SW4 Is connected to the contact b of the switch 2. Also, the output of the wide mode converter 13 And the outputs of the zoom mode converter 14 are connected to the contacts a and b of the switch SW5, respectively. The output of the switch SW5 is connected to the contact b of the switch SW2. switch SW5 is connected to switch SW3 that switches between zoom mode and wide mode There is.

[0019]   In FIG. 2, the switch SW2 is connected to the contact b except in the reproduction state. Further, when the input switch SW1 is connected to the contact a or b, the switch S W4 is connected to the contact a, and when the input switch SW1 is connected to the contact c, the switch SW4 is connected to the contact b. That is, there is a tuner 8 that receives a normal TV signal. If you select the external input line LINE as the input source, The signal selected by the switch SW1 is output to the video output terminal. Also type When the switch SW1 is connected to the contact c, the switch SW4 works in conjunction with this to connect the contact b. Connected to. Therefore, in this case, the contact of the switch SW3 is connected to the zoom side. Then, the switch SW5 is connected to the contact b, and the switch SW3 is connected to the wide side. Then, the switch SW5 is connected to the contact a. That is, the input signal source is MUSE If you select the conversion output of the / NTSC converter, it is output to the video output terminal. As for the conversion output, either the zoom mode or the wide mode is set to the switch SW3. Although it is selected, when the recording state is set, the video recording signal processing circuit 9 is marked. Since the added signal is the output of the wide mode converter 13, the switch SW5 Wide mode recording is performed regardless of the contact point. Furthermore, the video output end in this case From the child, zoom mode or wide mode selected by switch SW3 The video signal of is output.

[0020]

[Effect of device]

  As described above, according to the present invention, the monitor video output of the VTR is changed to the high definition TV. The screen can be freely changed between the zoom mode screen and the wide mode screen on the current TV receiver. You can select and view it, and the wide mode is automatically Since the video is recorded by the video signal of the It has the advantage that it can be recorded without any problems, and it operates the VTR with a built-in MUSE / NTSC converter. The workability is improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is a block diagram showing a second embodiment of the present invention.

FIG. 3 is a block diagram showing an example of a conventional converter.

[Explanation of symbols]

7 MUSE / NTSC converter 8 tuners 9 Video recording signal processing circuit 10 rotary head 11 Video reproduction signal processing circuit 12 OR gate 13 Wide mode converter 14 Zoom mode converter

Claims (2)

[Scope of utility model registration request] 1. A video recording signal processing circuit for recording a video signal on a magnetic tape, a video reproduction signal processing circuit for reproducing a video signal recorded on the magnetic tape, and a high quality TV signal applied thereto. , In order to display a high quality TV signal having a predetermined aspect ratio on a TV screen having an aspect ratio of 3: 4, the high quality TV signal is trimmed to have an aspect ratio of 3: 4 and the number of scanning lines and the time axis are converted. A TV having the first function and the high-quality TV signal with a predetermined aspect ratio of 3: 4.
A high-definition TV signal conversion circuit in which a scanning line of the high-definition TV signal and a second function for converting the time axis for display on a screen are switched based on a control signal, and a normal T
V signal, video signal applied from the outside, and the high quality TV
An input switching switch for selecting the converted output of the signal converting circuit and applying it to the video recording signal processing circuit;
The mode selection means for outputting the control signal for switching the first function and the second function of the V signal conversion circuit, and the output of the mode selection means forcibly set to a predetermined signal according to the signal indicating the recording state, A VTR with a built-in high-definition TV signal conversion circuit, comprising a control circuit having the high-definition TV signal conversion circuit as the second function. 2. A video recording signal processing circuit for recording a video signal on a magnetic tape, a video reproduction signal processing circuit for reproducing a video signal recorded on the magnetic tape, and a high-frequency circuit having a predetermined aspect ratio. Image quality TV signal with T of aspect ratio 3: 4
In order to display on the V screen, the first high-quality TV signal is trimmed to have an aspect ratio of 3: 4 and the number of scanning lines and the time axis are converted, and the high-quality TV signal has a predetermined aspect ratio. A second converter for converting the scanning lines and the time axis of the high-quality TV signal to display the same on a TV screen with an aspect ratio of 3: 4; a normal TV signal and a video signal applied from the outside. An input changeover switch for selecting an output of the second converter and applying it to the video recording signal processing circuit, an output of the video reproduction signal processing circuit and the first
VTR with a built-in high image quality TV signal conversion circuit, which comprises a monitor output switching circuit for selectively outputting the output of the second converter and the output of the second converter.