JP2002369096A - Television receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a television receiver equipped with I/F corresponding to various formats capable of realizing a stable video whose picture turbulence is small by sharply shortening a switching time to be generated at the time of switching the I/F. SOLUTION: This television receiver is provided with a signal switching circuit necessary for realizing the signal discrimination of each input part so that it is possible to always perform signal discrimination even to any unselected input part. At the time of performing power start or a key operation or the like, a plurality of input parts are automatically scanned, and the signal discrimination of those respective input parts is realized, and the discriminated results are preset. Also, the other unselected input parts are always automatically scanned, and the signal discrimination of those respective input parts are realized, and the discriminated results are preset.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an input signal discriminating circuit in a color television receiver.

[0002]

2. Description of the Related Art In a recent color television receiver, an input video signal is 48
0I, 480P, 1080I, etc., as well as computer signals as the video becomes multimedia, so that various formats can be input, and digital signals in addition to conventional analog signals can be input. It has become to. Therefore, the television receiver is provided with an input interface (hereinafter, I / O) corresponding to various signal formats.
F). Further, in order to display input video signals in various formats on a television receiver, it is necessary to set optimum settings in the receiver according to the respective signals. When the input signal is switched, first the I / F section is switched, and then the signal discrimination is performed based on the horizontal frequency, the vertical frequency, and the like of the signal input to each. In recent color television receivers, since the number of display devices having fixed pixels such as an LCD monitor, an LCD projector, and a plasma display is increasing, advanced color television receivers, such as converting various input formats to a certain format, are required. In order to perform digital video signal processing, it has become necessary to accurately determine the format of the input signal such as the total number of dots in one horizontal period and the total number of lines in one vertical period. In order to detect such information, conventionally, a circuit has been proposed which determines a horizontal frequency and a vertical frequency and detects various signal format information from the information.

An example of the conventional signal discriminating circuit will be described below with reference to the accompanying drawings. FIG. 4 shows a block diagram of a conventional signal discriminating circuit. This is a discrimination circuit that detects necessary information inside the television receiver from the horizontal synchronization signal and the vertical synchronization signal after switching the input video signal.

In FIG. 4, 1 is a video composite signal, 2 is a 4-system composite I / F for converting a composite from analog to digital (AD conversion), 3 is an analog component signal, and 4 is an analog for AD converting an analog component. Component I / F, 5 is a computer (PC) analog signal, 6 is a PC analog I / F which converts a PC analog signal into a digital signal by AD conversion, 7 is a PC serial digital signal, and 8 is a PC serial digital signal in parallel. PC digital I / F for converting into a signal, 9 is a signal selected and projected by a television receiver, 10 is a reference signal for signal discrimination, 11 is an I / F switch, 12 is a switching control circuit, and 13 is a switching circuit. Signal discriminating circuit, 14 is a set microcomputer for controlling the television receiver, 15 is a remote controller External control signal, 16 is a data control circuit, 17 is a signal processing circuit, 18 is a video output signal after signal processing.

[0005] An operation example of the conventional signal discriminating circuit thus configured will be described below. First, when an NTSC signal is input to the 4-system composite I / F 2 of FIG. 4 and a television receiver is displayed, a request to switch to the PC analog I / F is sent to the set microcomputer 14 by the control signal 15 of the remote controller. When input, the set microcomputer 14 controls the switching control circuit 12, and the I / F
The switch 11 is operated to switch to the PC analog I / F 6, and a signal obtained by digitally converting the PC analog signal 5 to the input signal 9 is input to the signal processing circuit 17.

At this time, the horizontal synchronizing signal and the vertical synchronizing signal, which are the signal judging reference signals 10, are inputted to the signal judging circuit 13, and the signal judging circuit 13 outputs the horizontal synchronizing frequency, the vertical synchronizing frequency, and the polarity of the synchronizing signal. , A PC analog signal is determined, and format information such as the total number of dots in one horizontal period and the total number of lines in one vertical period of the input signal is accurately determined. The information is input to the set microcomputer 14 and the set microcomputer 14 controls the data control circuit 16.
The necessary data corresponding to the input signal is transmitted and set to the signal processing circuit 17, so that a signal subjected to digital signal processing such as signal format conversion is output as a video output signal 18, and a television signal is received by a driving circuit at the subsequent stage. The vessel is projected. Therefore, the selected PC analog I / F
Can normally be displayed.

Further, even if the I / F is not switched and the input signal is switched externally, the signal discriminating circuit 1 is provided in real time.
Since the monitoring is performed in step 3, the set microcomputer 14 sends and sets optimal data to the signal processing circuit 17 each time, so that the television receiver can display a stable image. Even if the interface is switched to another I / F, the same determination as described above is performed, and the television receiver performs the optimal signal processing.

As described above, the signal discrimination of the television receiver is performed by detecting the input horizontal synchronizing signal, vertical synchronizing signal, and the polarity of the synchronizing signal. It is possible to determine and to perform advanced digital signal processing such as signal format conversion for display on a fixed device or the like. Further, since the digital circuit is used, high integration can be easily performed and the circuit scale can be reduced.

[0009]

However, in the above-mentioned conventional configuration, in the case of signal switching for switching the I / F, the synchronization signal, which is a reference signal for signal discrimination, is I / F.
Since detection can be performed only after F is switched, it takes time to complete the signal determination, and it also takes time to complete the vertical frequency determination in the signal determination. Therefore, it takes time to detect the detailed format information of the input signal and complete the setting of the optimal data to the signal processing unit. For this reason, there has been a problem that the signal switching time is long, optimal data is not set in the signal processing unit, and the signal displayed on the television receiver during that time is not stable.

[0010]

In order to solve this problem, a signal discriminating circuit of the present invention preliminarily discriminates a signal input to each input signal I / F, so that an I / F signal can be obtained.
Since the signal discrimination that occurs when F is switched can be omitted, the time required for signal switching can be greatly reduced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A signal discriminating circuit according to a first aspect of the present invention is a signal discriminating device inside a television receiver, which inputs all signal discriminating reference signals of each I / F signal to the signal discriminating circuit. By always performing signal discrimination, signal discrimination at the time of switching the I / F can be omitted, and the time required for signal switching can be reduced.

Next, a signal discriminating apparatus according to a second aspect of the present invention is provided when a power of a television receiver is turned on or a key for a remote controller or the like.
By automatically switching an I / F by an operation to determine an input signal in advance and presetting the signal in a memory, signal determination at the time of switching the I / F is omitted and the time required for signal switching is reduced. Can be realized.

Next, a signal discriminating apparatus according to a third aspect of the present invention is an I / F which is not selected separately from the conventional signal discriminating apparatus.
Is automatically switched, the signal input to the other I / F is always signal-discriminated and preset in a memory, so that the signal discrimination at the time of switching the I / F is omitted and the signal switching is required. It is possible to reduce the time.

(Embodiment 1) An embodiment of the invention described in claim 1 of the present invention will be described below with reference to FIG.

FIG. 1 is a block diagram of a signal discriminating device in a television receiver according to a first embodiment of the present invention. In FIG. 1, reference numeral 19 denotes a multi-input signal discriminating circuit capable of discriminating four inputs simultaneously, and reference numerals 20 to 23 denote signal discriminating reference signals of each I / F. Components that operate in the same manner as in FIG. 4 of the conventional embodiment are denoted by the same reference numerals, and description thereof is omitted.

The operation of the thus-configured signal discriminating circuit in the television receiver of the present embodiment will be described below.

First, when an NTSC signal is input to the 4-system composite I / F 2 of FIG. 1 and a television receiver is displayed, the multi-input signal determination circuit 19 outputs a signal determination reference signal of the selected I / F. The microcomputer 20 controls the data control circuit 16 and sets the most suitable data for the input signal to the signal processing 17 by discriminating the signal based on the horizontal synchronization signal and the vertical synchronization signal of 20 and supplying the signal format information to the microcomputer 14. It is carried out. At the same time, the multi-input signal discriminating circuit 19 is input to another I / F by the horizontal synchronizing signal and the vertical synchronizing signal which are the signal discriminating reference signals 21, 22, and 23 output from other unselected I / Fs. Each of the existing signals is also subjected to signal discrimination to obtain signal format information. When a request to switch to the PC analog I / F is input to the microcomputer 14 by the control signal 15 of the remote controller, the microcomputer 14 controls the switching control circuit 12 to operate the I / F switch 11 to operate the PC analog I / F 6.
Since the input signal of each I / F is determined in advance by the multi-input signal determination circuit 19, the input signal format information of the I / F to be switched is supplied to the microcomputer 14 immediately. The data control circuit 15 is controlled to set optimal data for the input signal in the signal processing 17.

According to this configuration, even in the case where the I / F is switched, the time required for the switching can be greatly reduced by previously discriminating all the input signals of each I / F.

(Embodiment 2) An embodiment of the invention described in claim 2 of the present invention will be described below with reference to FIG.

FIG. 2 is a block diagram of a signal discriminating device in a television receiver according to a second embodiment of the present invention. In FIG. 2, reference numeral 24 denotes an automatic signal discrimination circuit for automatically switching an I / F to acquire input format information;
Reference numeral 5 denotes a memory for storing a result determined by the automatic determination circuit, and reference numeral 26 denotes a video MUTE circuit. Components that operate in the same manner as FIG. 1 of the conventional embodiment and FIG. 1 of the embodiment are denoted by the same reference numerals, and description thereof is omitted.

The operation of the thus-configured signal discriminating circuit in the television receiver of the present embodiment will be described below.

First, in the television receiver, when the power is turned on or when a user using the remote controller is operated, the microcomputer 14 controls the I / O via the switching control circuit 12.
The I / F switch 11 is controlled to automatically switch the I / F.
The signal determination circuit 13 performs signal determination on the switched video signal determination reference signal 10 and supplies signal format information to the automatic determination circuit 24. The automatic discrimination circuit 24
Saves the signal format information in the memory 25 together with the type of I / F. As soon as the above operation is completed, the next I / F switching is automatically performed, and the I / F information and the input format information are stored in the memory in the same manner as described above. As described above, the signals input to all the I / Fs are determined in advance, and the signal format information is stored in the memory. Therefore, when switching the I / F, the automatic determination circuit 24 reads out the selected I / F information stored in the memory 25 in advance and supplies it to the microcomputer 14 to control the data control circuit 15 to optimize the input signal. Data is set in the signal processing 17. Also, while the input signal is being determined, the MUT
The output signal 18 is turned off by the E circuit 22 so that a disturbed image is not displayed.

According to such a configuration, even when the I / F is switched, all input signals of each I / F are discriminated in advance, and information of the input signal is saved, so that the time required for the switching is greatly reduced. Can be shortened to

(Embodiment 3) An embodiment of the invention described in claim 3 of the present invention will be described below with reference to FIG.

FIG. 3 is a block diagram of a signal discriminating device in a television receiver according to a third embodiment of the present invention. In FIG. 3, reference numeral 27 denotes a signal switch, reference numeral 28 denotes a signal determination reference signal switched by the signal switch, and reference numeral 29 denotes a sub-signal determination circuit that determines a signal based on the reference signal. Components that operate in the same manner as in FIG. 4 of the conventional embodiment and FIGS.

The operation of the thus-configured signal discriminating circuit in the television receiver of the present embodiment will be described below.

First, when an NTSC signal is input to the 4-system composite I / F 2 of FIG. 3 and a television receiver is displayed, the signal discriminating circuit 13 selects the selected I / F.
The microcomputer 14 controls the data control circuit 15 to determine the most suitable data for the input signal by providing signal determination information to the microcomputer 14 based on the horizontal synchronization signal and the vertical synchronization signal of the signal determination reference signal 10. The settings are made in the signal processing 17. At the same time, the automatic discrimination circuit 24 controls the switch 27 to output a signal discrimination reference signal 21 output from another I / F that is not selected.
The horizontal synchronizing signal and the vertical synchronizing signal 22 and 23 are supplied to the sub-signal discriminating circuit 29. Sub signal discriminating circuit 29
Represents each I not selected by the signal determination reference signal.
The signal discrimination is performed for the / F input signal, and the signal format information is supplied to the automatic discrimination circuit 24. The automatic discrimination circuit 24 stores signal format information in the memory 25 together with the type of I / F. As soon as the above operation is completed, the next I / F switching is automatically performed, and the I / F information and the input format information are stored in the memory in the same manner as described above. In this way, the signals input to all the I / Fs are determined in advance, and the signal format information is stored in the memory. Therefore, when switching the I / F, the automatic determination circuit 24 reads out the selected I / F information stored in the memory 25 in advance and supplies it to the microcomputer 14 to control the data control circuit 15 to optimize the input signal. Data is set in the signal processing 17.

Also, even if the I / F is not switched and the input signal is switched externally, the signal discriminating circuit 1 is provided in real time.
Since the monitoring is performed in step 3, the set microcomputer 14 sends and sets optimal data to the signal processing circuit 17 each time, so that the television receiver can display a stable image.

According to such a configuration, even when the I / F is switched, all the input signals of each I / F are always discriminated, so that the time required for the I / F switching is greatly reduced. And switching within the I / F is also possible.

In the first, second, and third embodiments, the input synchronizing signal of the television receiver has been described for easy understanding. Needless to say.

Although the signal discrimination has been described, it is needless to say that the format discrimination of the input signal other than the horizontal synchronizing signal and the vertical late signal discrimination is also effective.

[0032]

As described above, in a television receiver having an I / F compatible with various formats, the switching time generated when the I / F is switched can be greatly reduced, and a stable image with less image disturbance can be realized.

[Brief description of the drawings]

FIG. 1 is a block diagram of a signal discriminating device in a television receiver according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a signal discriminating device in a television receiver according to a second embodiment of the present invention.

FIG. 3 is a block diagram of a signal discriminating device in a television receiver according to a third embodiment of the present invention.

FIG. 4 is a circuit diagram of a signal discrimination circuit in a conventional television receiver.

[Explanation of symbols]

 1 video composite signal 2 4 system composite I / F 3 analog component signal 4 analog component I / F 5 computer (PC) analog signal 6 PC analog I / F 7 PC serial digital signal 8 PC digital I / F 9 selected input Signal 10 Reference signal for signal discrimination 11 I / F switch 12 Switching control circuit 13 Signal discrimination circuit 14 Microcomputer 15 External control signal such as remote control 16 Data control circuit 17 Signal processing circuit 18 Video output signal 19 Multi-input signal discrimination circuit 20- 23 I / F determination reference signal 24 Automatic determination circuit 25 Memory 26 MUTE circuit 27 Switch 28 Signal determination reference signal 29 Sub-signal determination circuit

Claims (3)

[Claims] A means for converting a composite video signal into a digital signal; a means for converting a component video signal into a digital signal; a means for converting a DVI (serial digital) signal image from a computer or the like to a digital signal; Means for switching a signal output from the interface, means for controlling the switch, means for processing a video signal output from the switch, and horizontal synchronization of a signal determination reference signal output from the switch. Means for simultaneously determining format information of input signals of all interfaces from a signal and a vertical synchronization signal; means for generating data necessary for a signal processing circuit corresponding to an input signal from the format information; and signal processing of the data. A television receiver, comprising: 2. A means for converting a composite video signal to a digital signal, a means for converting a component video signal to a digital signal, a means for converting a DVI (serial digital) signal image from a computer or the like to a digital signal, and the input means Means for switching a signal output from the interface, means for controlling the switch, means for processing a video signal output from the switch, and horizontal synchronization of a signal determination reference signal output from the switch. Signal, a means for determining format information of input signals of all interfaces in time series from a vertical synchronizing signal, a means for storing the format information and interface information, and an input based on the stored format information when switching interfaces. Data required for signal processing circuit according to signal And a means for setting the data to a signal processing unit. 3. A means for converting a composite video signal into a digital signal, a means for converting a component video signal into a digital signal, a means for converting a DVI (serial digital) signal video such as a computer into a digital signal, and the input Means for switching a signal output from the interface, means for controlling the switch, means for processing a video signal output from the switch, and horizontal synchronization of a signal determination reference signal output from the switch. Means for determining the format information of the input signal selected from the signal and the vertical synchronization signal, means for switching the signal determination reference signal of each interface, and the horizontal synchronization signal and the vertical synchronization signal of the signal determination reference signal output from the switch. From the synchronization signal, the format information of the input signals of all interfaces is determined in chronological order. Means for differentiating, means for saving the format information and interface information, means for creating data necessary for a signal processing circuit corresponding to an input signal based on the saved format information when switching an interface, Means for setting to a signal processing unit.