JPH04253487A - Vtr compatible with wide aspect ratio - Google Patents

Abstract

PURPOSE:To offer the VTR compatible with a wide aspect ratio able to record/ reproduce an external wide aspect discrimination signal with respect to the VTR recording and reproducing a TV signal whose aspect ratio is 16: 9. CONSTITUTION:The VTR able to record and reproduce a wide aspect signal is provided with an aspect ratio discrimination information input terminal 51, a discrimination signal selection circuit 53 selecting either the inputted discrimination information or the discrimination information obtained from an internal tuner, a discrimination signal selection circuit 54 selecting an output of the selection circuit 53 in the recording mode and a discrimination signal selection circuit 54 selecting a discrimination signal output obtained from a control track and a discrimination signal output terminal 52.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a wide aspect compatible VTR capable of recording and reproducing TV signals whose aspect ratio is different from the 4:3 of the NTSC system, and in particular, the present invention relates to a wide aspect compatible VTR capable of recording and reproducing TV signals whose aspect ratio is different from the 4:3 of the NTSC system. The present invention relates to a wide aspect compatible VTR having a discrimination signal processing circuit and an output terminal thereof for transmission to a wide aspect.

0002

[Prior Art] In recent years, as TV receivers have become larger and have higher image quality, the current NTSC (National Telephone System)
A review and improvement plan was proposed for the vision system committee (EDTV) system, some of which was
It is being standardized under the name Enhanced TV. Under these circumstances, in the future, we plan to include a wide aspect ratio (width:height = 16:9), which is an even wider aspect ratio than the current aspect ratio (width:height = 4:3), in the EDTV standard. There is a growing movement to do so. By setting the aspect ratio to 16:9, it not only has the visual effect of drawing people into the TV screen when watching on a large screen, but also allows you to watch a very wide area at once for sports programs, and allows you to watch movies on a larger screen than before. This eliminates the problem of missing some horizontal information, or the top and bottom of the screen being filled with black, and it has the advantage of creating a more impressive screen.

[0003] Also in Europe, the current PAL (Ph
Among the various methods that have been proposed that are improvements to the (as Alternation by Line) method, they are all considered based on a wide aspect ratio of 16:9. Furthermore, ATV (Advanced TV) is also available in the United States.
Under the name , a system with emphasis on compatibility between satellite broadcasting and terrestrial broadcasting is being considered, and there is a trend toward incorporating wide aspect ratios.

In line with these trends in TV systems, home VTRs record and play back wide aspect signals, and also record and play back an identification signal indicating that the signal is a wide aspect signal on the magnetic tape, and automatically detect the wide aspect signal. Methods for discriminating between signals and conventional 4:3 aspect signals have been studied, and some are in the process of being standardized.

[0005] The following is a conventional wide aspect compatible VTR.
will be explained with reference to the drawings.

FIG. 2 shows a conventional wide aspect compatible VTR.
In this block diagram, 1 is an antenna, 40 is a wide aspect compatible VTR, 5 is an input terminal, 10 is a video signal recording head, 11 is a magnetic tape, 15 is a control signal recording/playback head, and 16 is a video signal playback head. , 25 represent output terminals. The relationship and operation of each component will be explained below.

First, incoming radio waves are received and tuned by the antenna 1 and the tuner 2, and then demodulated into a composite video signal and sent to the Y/C separator 3, where the luminance signal component Y1 (hereinafter referred to as (abbreviated as Y signal) and chroma signal component C1 (abbreviated as Y signal)
(hereinafter abbreviated as C signal) is separated. The separated Y signal and C signal pass through the input selection switch 6, and then are subjected to known signal processing in the luminance signal recording processing circuit 7 and the chroma signal recording processing circuit 8, that is, the Y signal is subjected to automatic gain adjustment, emphasis, After performing processing such as FM modulation, and processing such as automatic chroma level adjustment and low frequency conversion for the C signal,
The signals are frequency-multiplexed by a mixing circuit 9 and recorded on a magnetic tape 11 via a recording head 10.

Furthermore, during reproduction, the video information on the magnetic tape 11 is converted into an electrical signal by the reproduction head 16, and after being amplified by the reproduction amplifier 18, the Y signal is FM demodulated by the luminance signal reproduction processing circuit 19. The C signal is subjected to de-emphasis, etc., and is then subjected to frequency conversion, etc. again in the chroma signal reproduction processing circuit 20, as a reproduced Y output Y4.
, respectively. The reproduced Y output and C output are outputted from an output terminal 25 to a monitor TV or the like via a switch 21. Note that the switch 21 controls the playback outputs Y4, C4.
This is for switching between input signals Y3 and C3 during recording, and when recording, it can be connected to the Y3 and C3 sides to monitor the recorded image, and during playback, it can be connected to the Y4 and C4 sides to monitor the reproduced image. ing.

The connector arrangement of the input terminal 5 and the output terminal 25 is as shown in FIG. 4, and the Y signal and C signal are transmitted separately. It also has a ground terminal. This type of connector is capable of transmitting Y and C signals with little interference, and has been used in recent years as a transmission form that can avoid cross color interference and dot interference that tend to occur when separating Y/C. It is used for transmission of VTRs, TVs, etc. Further, the portion indicated by N in FIG. 4 corresponds to a support column provided to facilitate connection of the connector, and no conductive contact piece for signal transmission is provided.

On the other hand, to determine whether the signal received by the tuner 2 is a 16:9 wide aspect signal, a wide aspect discriminating circuit 4 detects an identification signal carried on the transmitted radio wave.
If it is a wide aspect signal, a control signal is sent to the control signal generation circuit 12 for generating control pulses for the servo circuit 13, and the duty ratio of the positive pulse and negative pulse of the control signal is changed from the normal time. Perform processing to change to a different value. In other words, in the case of a normal 4:3 aspect signal, if the control pulse has a duty ratio of 50%:50% between the positive pulse and the negative pulse, as shown in Figure 3(a), the wide aspect signal In the case of a signal, the control pulse is shown in Figure 3 (
As shown in b), change the duty ratio of the positive pulse and negative pulse to 60%:40%. Furthermore, recently, encoding has been considered to prevent misjudgment during playback. For example, the duty ratio of positive pulses: negative pulses is 60.
%: 40% is L pulse, duty ratio is 55
%: If 45% is an S pulse, then L, L, S, S, L, L, S, S for each frame when a wide aspect signal is used.
, . . ., it is possible to eliminate various causes of misjudgment. By using the above method, the control pulse for the servo is modulated with a duty ratio, and the control head 15
Accordingly, wide aspect discrimination information is recorded on the longitudinal track of the magnetic tape 11. Further, to reproduce the discrimination signal, the control pulse converted into an electric signal by the control head 15 is transferred to the control signal reproducing circuit 2.
After amplification and waveform shaping in step 2, the duty ratio detection section 23 detects the duty ratio of the positive pulse and the negative pulse of the control pulse. Encoding when the duty ratio is the wide aspect signal mentioned above (for example, the above-mentioned L, L, S, S,
A wide aspect discrimination circuit 24 determines whether or not the aspect ratio matches L, L, . The processing circuit 20 is controlled. Note that the control pulse that is the output of the duty ratio detection section 23 is transmitted to the servo circuit 13.
It is also used to control the motor 14 of the cylinder, capstan, etc.

[0011]

[Problems to be Solved by the Invention] However, with the above conventional configuration, when recording using the tuner 2 of the VTR 40, it is possible to discriminate the wide aspect signal and record the discrimination signal on the magnetic tape. However, when recording by connecting another tuner or video device to the input terminal 5, it is not possible to determine whether the signal is a wide aspect signal or not, so it is necessary to record a wide aspect determination signal on the magnetic tape. It had the disadvantage that it was not possible.

[0012] Furthermore, when outputting the reproduced wide aspect signal to another video device, such as a monitor TV, etc., via the output terminal 25, the wide aspect discrimination information is not transmitted. It also had the disadvantage that it was not possible to determine whether

Furthermore, when recording the output of the tuner 2 of the VTR 40, the discrimination is performed inside the VTR 40, but the discrimination information is not transmitted to the monitor TV connected to the outside via the output terminal 25. In the end, monitor T
Another drawback is that the V aspect ratio mode must be manually switched.

[0014] The present invention solves the above-mentioned conventional problems, and makes it possible to transmit wide aspect discrimination information even when connected to other video equipment, while maintaining compatibility with conventional consumer connectors. The objective is to provide a VTR that supports wide aspect ratios with a small amount of circuit addition and modification.

[0015]

[Means for Solving the Problems] In order to achieve this object, the wide aspect compatible VTR of the present invention is a VTR capable of recording a video signal with an aspect ratio of 16:9.
Is the aspect ratio of the discrimination signal input terminal for inputting discrimination information indicating that the aspect ratio is 16:9 from an external video device, the tuner section, and the video signal output of the tuner section equal to 16:9? a first wide aspect discriminating circuit for discriminating whether or not a wide aspect discriminator outputs either the discriminating signal of the discriminating signal input terminal or the output signal of the first wide aspect discriminating circuit according to the input selection mode of the VTR. A first discrimination signal selection circuit is connected to the first discrimination signal selection circuit, which is configured to be able to select the signal according to the first discrimination signal. a pulse width modulation circuit that performs encoding processing by pulse width modulation;
It has a configuration including a control head that records the output of the pulse width modulation circuit on a magnetic recording tape.

[0016] Furthermore, in a VTR capable of recording and reproducing video signals with an aspect ratio of 16:9, 1
A discrimination signal input terminal that inputs discrimination information indicating that the aspect ratio is 6:9, a tuner section, and the aspect ratio of the video signal output of the tuner section are determined to determine whether the ratio is 16:9. Either one of the first wide aspect discriminating circuit and the discriminating signal of the discriminating signal input terminal, or the output signal of the first wide aspect discriminating circuit can be selected according to the input selection mode of the VTR. a first discrimination signal selection circuit configured to record and reproduce a control signal; a control head connected to the control head, a duty ratio detection section for detecting a duty ratio of a positive pulse and a negative pulse of a control signal regenerated by the control signal regeneration circuit, and a control signal regeneration circuit connected to the control head; a second wide aspect discrimination circuit that compares and discriminates whether the pulse width detected by the ratio detection section matches a predetermined encoding process predetermined for a 16:9 wide aspect signal; and a VTR.
When the operation mode is the recording mode, the first discrimination signal selection circuit output is selected, and when the operation mode is the playback mode, the second discrimination signal selection circuit output is selected.
A second discrimination signal selection circuit configured to select the output of the wide aspect discrimination circuit, and a discrimination signal output terminal for transmitting the output of the second discrimination signal selection circuit to an external video device.

[0017]

[Operation] According to the above-described configuration, when recording the internal tuner signal, the present invention connects the first discrimination signal selection circuit to the wide aspect discrimination circuit side of the tuner. When inputting wide aspect discrimination information from an external device to the discrimination signal input terminal, and connecting the first discrimination signal selection circuit to the discrimination signal input terminal side, the wide aspect discrimination information can be used to generate a control signal. It can be transmitted to the circuit. As a result, even when external video equipment is connected,
By applying duty ratio modulation to the control signal in the control signal generation circuit, aspect ratio discrimination information can be recorded on the magnetic tape.

[0018] Furthermore, when outputting the VTR output to an external device such as a monitor TV, it is possible to transmit whether the VTR output is a wide aspect signal via the determination signal output terminal, and to check whether the output of the VTR is a wide aspect signal or not. Automatic discrimination enables signal processing according to the aspect ratio without switching the ratio mode.

[0019]

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

FIG. 1 is a block diagram of main parts of a wide aspect compatible VTR according to an embodiment of the present invention. In FIG. 1, 41 is a signal processing system of a wide aspect compatible VTR, 51 is an input terminal, and 52 is an output terminal.

The video signal received, tuned, and demodulated by the antenna 1 and tuner 2 passes through the Y/C separator 3
After recording and reproducing processing is performed on each signal and C signal,
The process by which the light is taken out to the output terminal 52 is the same as described in the prior art example. Here, the difference from the conventional example is (1)
(2) an input terminal A for inputting an aspect ratio discrimination signal to the input terminal 51 is added; (2) an output terminal 52;
Output terminal B for outputting the discrimination output to other video equipment
and (3) discrimination signal selection circuits 53 and 54 for selecting a discrimination signal depending on the mode of the VTR are added. The operation will be explained below.

First, the input terminal 51 receives Y from an external device.
Along with the signal Y2 and the C signal C2, an aspect ratio determination signal ID2 for indicating whether the aspect ratio is wide aspect can also be input to the A terminal, and is connected to the determination signal selection circuit 53. Discrimination signal selection circuit 5
3 is controlled by the input mode together with the input selection switch 6. When the input selection mode of the VTR 41 is set to the tuner mode, the input selection switch 6 is controlled to the Y1 and C1 sides, and the discrimination signal selection circuit 53 is controlled to the ID1 side. side,
You get to choose. Further, when the input selection mode is the external input mode, the input selection switch 6 is controlled to select the Y2, C2 side, and the discrimination signal selection circuit 53 is controlled to select the ID2 side.

With the above operation, even when a video signal from an external device is input from the input terminal 51, aspect ratio determination information is sent to the control signal generation circuit 12, and in the case of a wide aspect signal, the duty ratio of the control signal is determined. After the data is encoded as described in the conventional example, it is recorded on the magnetic tape 11 via the control head 15.

Next, in the discrimination signal processing during reproduction, the control pulse is reproduced through the control head 15, the control signal reproduction circuit 22, and the duty ratio detection section 23 as described in the conventional example, and then the wide aspect discrimination circuit 24 performs decoding processing and determines whether it is a wide aspect signal. The discrimination information discriminated by the wide aspect discrimination circuit 24 is sent to the luminance signal reproduction processing circuit 19 and the chroma signal reproduction processing circuit 20, where it is processed according to each aspect ratio, and is also sent to the discrimination signal selection circuit 54. , here a determination signal to be sent from the output terminal 52 to an external device (for example, a monitor TV, etc.) is selected. The discrimination signal selection circuit 54 is controlled by the recording/reproduction mode control signal together with the switch 21. During reproduction, the switch 21 selects the reproduction Y signal Y4 and the reproduction C signal C4.
The discrimination signal selection circuit 54 is the wide aspect discrimination circuit 24
The determination output ID4 is selected. Also,
During monitoring during recording, the switch 21 selects the output signals of the input selection switch 6, that is, the input Y signals Y3 and C3, and the discrimination signal selection circuit 54 selects the output ID3 of the input signal discrimination signal selection circuit 53. There is.

As described above, according to the wide aspect compatible VTR of the embodiment of the present invention, the discrimination signal ID4 indicating whether the reproduced signal is a wide aspect signal is sent during playback, and the discrimination signal ID4 is sent during recording to indicate whether the signal for recording is a wide aspect signal. The discrimination signal ID3 shown can be outputted to the output terminal 52 according to each mode. As a result, even if a monitor TV or the like is connected to the output terminal 52, it is possible to transmit the discrimination output from the VTR side to the external device.
It also becomes easy to automatically switch the mode selection of the aspect ratio of external equipment.

According to this embodiment, the input terminal 51 and the output terminal 54 are input/output terminals (A and B in FIG.
Terminals shown in ) are required, and there are concerns about cost increases, compatibility with conventional input/output terminals, and commonality issues.
This is the Y signal used for conventional video signal transmission.
Easy by changing the input/output terminals of the C signal separation type.
And it can be realized at low cost.

FIG. 5 shows a layout diagram of the input terminal 51 and output terminal 54 used in this embodiment. As can be seen by comparing the same figure with Fig. 4 described in the conventional example, only a metal contact piece for a discrimination signal is provided in the empty part (the part indicated by N in Fig. 4) that was not used as a connection terminal in the past. This can be easily achieved. Furthermore, since only a metal contact piece is provided in a conventionally vacant area, the external shape of the connector remains unchanged, and even when connected to a conventional VTR, no discrimination signal is transmitted and the connector can be used without any problems.

Furthermore, in this embodiment, the input/output terminals 51 and 52
is described as one pair, but even if there are a plurality of pairs, it can be handled by increasing the number of contacts of the discrimination signal selection circuit 53. Furthermore, if there are two or more systems of tuner 2 (for example,
This is also possible in cases where a tuner for satellite broadcasting is provided.

[0029]

As is clear from the above embodiments, the present invention is capable of recording and reproducing wide aspect identification signals input from external equipment, maintains compatibility with conventional connectors, and is compatible with the aspect ratio mode of monitor TV. It is possible to provide a wide aspect compatible VTR that can automatically switch.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of main parts of a wide aspect compatible VTR according to a first embodiment of the present invention.

[Figure 2] Block diagram of a conventional wide aspect compatible VTR

[Figure 3] Explanatory diagram of pulse width modulation of control signal

[Figure 4] Terminal layout diagram of conventional input/output terminals

[Figure 5] Terminal arrangement diagram of input/output terminals used in the present invention

[Explanation of symbols]

2 Tuner 4 Wide aspect discrimination circuit 12 Control signal generation circuit 15 Control recording/playback head 22 Control signal regeneration circuit 23 Duty ratio detection section 24 Wide aspect discrimination circuit 41 Wide aspect compatible VTR 51 Input terminal 52 Output terminal 53 Discrimination signal selection circuit 54 Discrimination signal selection circuit

Claims (4)

[Claims] Claim 1: A VTR capable of recording a video signal with an aspect ratio of 16:9, comprising: a discrimination signal input terminal for inputting discrimination information indicating that the aspect ratio is 16:9 from an external video device; and a tuner section. , a first wide aspect determination circuit that determines whether the aspect ratio of the video signal output of the tuner section is 16:9;
The discrimination signal of the discrimination signal input terminal or the first
a first discrimination signal selection circuit configured to select one of the output signals of the wide aspect discrimination circuit according to the input selection mode of the VTR; and a first discrimination signal selection circuit connected to the first discrimination signal selection circuit. , in the case of a wide aspect ratio of 16:9, a pulse width modulation circuit changes the duty ratio of the VTR's servo control signal and performs encoding processing by pulse width modulation, and the output of the pulse width modulation circuit is transferred to a magnetic recording tape. A wide aspect compatible VTR equipped with a control head for recording on the top. [Claim 2] In a VTR capable of recording and reproducing video signals with an aspect ratio of 16:9, an aspect ratio of 16:9 is transmitted from an external video device.
a discrimination signal input terminal for inputting discrimination information indicating that the aspect ratio is 16:9; A wide aspect discriminating circuit and a discriminating signal of the discriminating signal input terminal or an output signal of the first wide aspect discriminating circuit are configured to be selectable according to an input selection mode of the VTR. a first discrimination signal selection circuit;
a control signal generation circuit that is connected to the discrimination signal selection circuit and changes the duty ratio in the case of a wide aspect ratio of 16:9; a control head for recording and reproducing control signals; and a control signal reproduction circuit connected to the control head. a duty ratio detection section that detects a duty ratio of a positive pulse and a negative pulse of a control signal reproduced by the control signal reproduction circuit;
a second wide aspect discriminating circuit that compares and determines whether or not it conforms to a predetermined encoding process predetermined for a 16:9 wide aspect signal; a second discrimination signal selection circuit configured to select the output of the first discrimination signal selection circuit and select the output of the second wide aspect discrimination circuit in the case of playback mode; and the second discrimination signal selection circuit. A wide aspect compatible VTR equipped with a discrimination signal output terminal for transmitting circuit output to external video equipment. Claim 3: The discrimination signal input terminal is connected to a V input terminal from an external video device.
3. The wide aspect compatible VTR according to claim 1, wherein the input terminal has a structure integrated with a luminance signal input terminal and a chroma signal input terminal for inputting a video signal to the TR. 4. The discrimination signal output terminal according to claim 2, wherein the discrimination signal output terminal is an output terminal integrated with a luminance signal output terminal and a chroma signal output terminal for outputting a video signal from the VTR to an external video device. Wide aspect compatible VT
R.