JP2917822B2 - Video signal processing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal processing apparatus, and more particularly, to an aspect ratio of a screen.
The present invention relates to video signal processing in a screen mode in a 16: 9 television receiver.

[0002]

2. Description of the Related Art In recent years, many studies have been made on digital signal processing techniques for screen mode processing.

Hereinafter, an example of the above-described conventional video signal processing apparatus will be described with reference to FIG.

FIG. 5 shows a circuit configuration of a conventional screen mode selection device. In FIG. 5, 101 is a video signal input terminal, 102 is a screen mode selection signal input terminal selected externally, 103 is a control circuit for controlling a signal input to the screen mode selection signal input terminal 102, 104
Is a screen mode processing circuit for selecting a screen mode based on an output signal of the control circuit 103 from a video signal input from the video signal input terminal 101, and 105 is a screen mode processing circuit 104
Is a video signal output terminal for outputting the output signal. The operation of the screen mode selection device configured as described above will be described below.

[0005] The video signal input to the video signal input terminal 101 is input to the screen mode processing circuit 104. The signal input to the screen mode selection signal input terminal 102 is input to the control circuit 103. The control circuit 103 determines and processes the selected screen mode based on a signal input to the screen mode selection signal input terminal 102 from outside. The control signal output from the control circuit 103 is the screen mode processing circuit 1
04 is input. The screen mode processing circuit 104 processes and outputs a video signal according to the selected screen mode.
The video signal output from the screen mode processing circuit 104 is output from a video signal output terminal 105.

[0006]

The conventional screen mode selection device has a configuration for processing only the screen mode selected externally, and processes only the mode selected externally by the user.

The present invention has been made in view of the above problems, and provides a video signal processing circuit capable of automatically switching a screen mode in addition to an external selection signal.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a video signal input terminal and a video signal input control terminal. Control signal processing circuit for performing the following, a control circuit for controlling the output from the identification signal processing circuit, and a screen for selecting a mode of a screen based on an output signal from the control circuit for a video signal input from the video signal input terminal A mode processing circuit; and a terminal for outputting an output signal of the screen mode processing circuit.

A video signal input terminal; an identification control signal processing circuit for determining each bit of an identification control signal of the video signal input from the video signal input terminal and performing signal processing; A screen mode automatic selection circuit that automatically selects a screen mode according to an input video signal, and a non-standard signal detection circuit that detects and determines whether the video signal input from the video signal input terminal is a non-standard signal, A control circuit for selecting and controlling the output of the screen mode automatic selection processing or the discrimination control signal processing based on the output of the non-standard signal detection circuit; and And a terminal for outputting an output signal of the screen mode processing circuit.

[0010]

According to the present invention, with the above-described configuration, it is possible to determine what kind of video signal the transmitted signal is based on the flag obtained by the identification control signal processing, and automatically select and switch the screen mode. It is possible.

When the identification control signal is specially changed or missing and the flag cannot be determined, non-standard signal detection is performed to determine the type of video signal based on the transmitted video signal and determine the screen mode. Can be automatically selected and switched.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A video signal processing circuit according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a video signal processing circuit according to one embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a video signal input terminal;
Is a screen mode processing circuit for adaptively switching a screen mode for displaying a video signal input from the video signal input terminal, and 3 is an identification control for processing an identification control signal among video signals input from the video signal input terminal. Signal processing circuit,
Reference numeral 4 denotes a control circuit for detecting and controlling the flag obtained by the identification control signal circuit, and reference numeral 5 denotes a video signal output terminal for outputting an output signal of the screen mode processing circuit.

The operation of the video signal processing circuit of FIG. 1 configured as described above will be described below.

The video signal input to the video signal input terminal 1 is input to the screen mode processing circuit 2 and the identification control signal processing circuit 3. The identification control signal processing circuit 3 demodulates the identification control signal in the input video signal and obtains a flag of each bit. FIG. 3 shows the identification control signal. The output of the discrimination control signal processing circuit 3 obtained by demodulating the discrimination control signal of FIG. The control circuit 4 determines the flag obtained by the identification control signal processing circuit 3. At this time, the letter box of B3 and the flags of the confirmation signals B25 to B27 are detected, and it is determined whether the transmitted video signal is an EDTV2 video signal and a control signal is output. The control signal output from the control circuit 4 is input to the screen mode processing circuit 2. The screen mode processing circuit 2 selects a screen mode to be displayed according to the control signal output from the control circuit 4, and outputs a video signal. The video signal output from the screen mode processing circuit 2 is output from a video signal output terminal 5.

In FIG. 2, reference numeral 1 denotes a video signal input terminal, 2 denotes a screen mode processing circuit for adaptively switching a screen mode for displaying a video signal input from the video signal input terminal, and 3 denotes the video signal input terminal. A discrimination control signal processing circuit for processing a discrimination control signal in a video signal input from a video signal input terminal; 6 a screen mode automatic selection circuit for automatically selecting a screen mode based on the video signal input from the video signal input terminal; Is a control circuit for controlling the output signal obtained by the identification control signal circuit and the output signal obtained by the screen mode automatic selection circuit, and 8 is a signal indicating whether the video signal input from the video signal input terminal is a non-standard signal. Is a video signal output terminal for outputting an output signal of the screen mode processing circuit.

The operation of the video signal processing circuit of FIG. 2 configured as described above will be described below. In addition, non-standard
A signal is a synchronizing signal that satisfies various broadcasting standards.
Signal.

A video signal input to the video signal input terminal 1 is input to a screen mode processing circuit 2, an identification control signal processing circuit 3, a screen mode automatic selection circuit 6, and a non-standard signal detection circuit 8. The operation of the identification control signal processing circuit 3 is as described above. The operation of the screen mode automatic selection circuit 6 will be described with reference to FIG. FIG. 4 shows a screen with an aspect ratio of 3: 4 and 9:
16 shows a screen of FIG. The video signal of EDTV2 is shown in FIG.
Are sent like the screen of the aspect ratio 3: 4 shown in FIG. Here, the portions indicated by oblique lines are portions called upper and lower non-image portions, and the vertical reinforcement signals VT / VH are multiplexed.

The screen mode automatic selection circuit 6 accumulatively adds the luminance levels of the lines in the upper and lower non-image areas and, when the luminance level is lower than the set value, automatically judges that the video signal is an EDTV2 video signal, and automatically selects the signal shown in FIG.
The control signal for enlarging the screen to the aspect ratio 9:16 shown in FIG. The non-standard signal detection circuit 8 determines whether the video signal input to the video signal input terminal 1 is a non-standard signal due to the influence of a ghost, a weak electric field, or the like, when transferring the video signal to a VTR or the like. Whether the control signal has been changed or the video signal with the identification control signal multiplexed
When recording / reproducing with a TR or the like, it is determined whether or not the identification control signal is lost due to repeated dubbing or the like, or whether or not the identification control signal is missing during special playback (fast forward, rewind, still, etc.) When it is determined that the signal is a non-standard signal, an output of the screen mode automatic selection circuit 6 is selected. When it is determined that the signal is not a non-standard signal, a control signal for selecting the output of the identification control signal processing circuit 3 is output. .

The output signal obtained by the non-standard signal detection circuit 8 is input to the control circuit 7. The control circuit 7 selects and outputs the output of the discrimination control signal processing circuit 3 or the output of the screen mode automatic selection circuit 6 based on the control signal obtained by the non-standard signal detection circuit 8. The output of the control circuit 7 is input to the screen mode processing circuit 2. The operation of the screen mode processing circuit 2 is as described above, and its output signal is output from the video signal output terminal 5.

[0021]

As described above, according to the present invention, a video signal input terminal and a discrimination control signal for discriminating each bit of a discrimination control signal of a video signal input from the video signal input terminal and performing signal processing. A processing circuit, a control circuit for controlling an output from the identification control signal processing circuit, and a screen mode processing circuit for selecting a mode of a screen based on an output signal from the control circuit for a video signal input from the video signal input terminal. By providing the terminal for outputting the output signal of the screen mode processing circuit, it is possible to automatically select the mode of the screen by processing the identification control signal.

A video signal input terminal; a discrimination control signal processing circuit for discriminating each bit of a discrimination control signal of the video signal input from the video signal input terminal and performing signal processing; A screen mode automatic selection circuit that automatically selects a screen mode according to an input video signal, and a non-standard signal detection circuit that detects and determines whether the video signal input from the video signal input terminal is a non-standard signal, A control circuit for selecting and controlling the output of the screen mode automatic selection processing or the discrimination control signal processing based on the output of the non-standard signal detection circuit; and By providing a screen mode processing circuit that performs mode selection, and a terminal that outputs an output signal of the screen mode processing circuit,
By detecting the non-standard signal, it is possible to automatically select the mode of the screen even when the identification control signal is lost.

[Brief description of the drawings]

FIG. 1 is a block diagram of a video signal processing circuit according to the present invention.

FIG. 2 is a block diagram of a video signal processing circuit according to the present invention.

FIG. 3 is a diagram showing an identification control signal in EDTV2.

FIG. 4 is a diagram showing the principle of a screen mode automatic selection circuit.

FIG. 5 is a circuit diagram of a conventional screen mode selection device.

[Explanation of symbols]

 Reference Signs List 1 video signal input terminal 2 screen mode processing circuit 3 identification control signal processing circuit 4 control circuit 5 video signal output terminal 6 screen mode automatic selection circuit 7 control circuit 8 non-standard signal detection circuit

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hideyo Uehata 1006 Kazuma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Soichiro Katsuki 1006 Kazuma Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (58) Field surveyed (Int.Cl. ⁶ , DB name) H04N 5/46

Claims (2)

(57) [Claims] 1. A video signal input terminal, and the identification control signal processing circuit to determine the state of each bit of the identification control signal of the video signal inputted from the video signal input terminal, before
In the identification control signal processing circuit , the identification control signal B
Signal indicating the letterbox of No. 3 and B25 to B27
The discrimination control signal processing indicating the discrimination result of the confirmation signal of
And a control circuit for determining the aspect ratio according to an output from the sense circuit, and a screen mode processing circuit for switching the aspect ratio the video signal inputted from the video signal input terminal an output signal from said control circuit A video signal processing device characterized by the above-mentioned. 2. A video signal input terminal, an identification control signal processing circuit for determining a state of each bit of an identification control signal of a video signal input from the video signal input terminal, and a video signal input from the video signal input terminal. A screen mode automatic selection circuit for determining an aspect ratio from a video portion of the video signal, a non-standard signal detection circuit for detecting and determining whether or not the video signal input from the video signal input terminal is a non-standard signal; before If the standard signal detection circuit of the video signal inputted from the video signal input terminal determines that the non-standard signal
Select and output a signal from the screen recording mode automatic selection circuit , or if the non-standard signal detection circuit does not determine the video signal input from the video signal input terminal as a non-standard signal, the identification control signal A signal indicating a letter box of B3 of the discrimination control signal and B2
5 from the illustrating a discriminated result of the confirmation signal B27
A control circuit for inputting an output from the identification control signal processing circuit to determine and output an aspect ratio, and for switching a video signal input from the video signal input terminal according to an output signal from the control circuit; A video signal processing device comprising: a screen mode processing circuit.