JP3301196B2 - Scan converter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scanning converter for converting a scanning standard of an input signal into a different scanning standard and outputting the converted signal.

[0002]

2. Description of the Related Art In recent years, various video media have appeared, and in addition to television signals, video signals of various scanning standards such as personal computers and workstations have been used. In addition, there is an increasing need for a scan conversion device for displaying images on a display device of a single scanning standard. This scan conversion device is a device mainly for converting a horizontal frequency or a vertical frequency of an input video signal into a different horizontal frequency or a different vertical frequency.

[0003] A conventional scan conversion apparatus will be described below with reference to FIGS. FIG. 3 is a block diagram of a conventional scan converter, and FIG. 4 is an operation flowchart of a process of identifying an input video signal in the conventional scan converter and specifying control data to be set in each unit in the scan converter. is there.

[0004] Reference numeral 21 denotes a scan conversion device. 1A, 1B,
Reference numerals 2 and 3 denote computers for connecting each video signal and synchronization signal to the scan conversion device 21. Reference numeral 4 denotes a signal switching unit for switching between a video signal and a synchronization signal from each computer, and reference numeral 5 denotes a signal switch. Reference numeral 6 denotes a number selection unit for selecting a signal number for the signal switching unit 5, and 8 denotes a selected video signal and a synchronization signal. Reference numeral 10 denotes a scan conversion unit. Reference numeral 11 denotes an analog-to-digital conversion unit (hereinafter, referred to as an A / D conversion unit) for converting the selected video signal 8 from analog to digital. Reference numeral 12 denotes a scan conversion processing unit which performs digital signal processing including a normal memory. Reference numeral 13 denotes a digital-to-analog converter (hereinafter, referred to as a D / A converter) that converts a digital video signal converted by the scan converter 12 into an analog signal.

[0005] Reference numeral 14 denotes a synchronizing signal discriminating unit which receives the video selected by the signal switching unit 4 and the synchronizing signal of the synchronizing signal 8 and identifies its horizontal frequency, vertical frequency, synchronizing signal polarity and the like. Reference numeral 15 denotes a clock reproduction unit that reproduces a clock used in the A / D conversion unit 11 and the scan conversion processing unit 12. Reference numeral 16 denotes a clock phase control unit for adjusting and controlling the phase of the clock with respect to the synchronization signal 8, and reference numeral 23 denotes a volume for manually setting the clock phase. Reference numeral 17 denotes a clock generation unit that supplies a clock signal to the scan conversion processing unit 12 and the D / A conversion unit 13.

Reference numeral 18 denotes a control unit for controlling each processing unit in the scan conversion unit 10, which is usually constituted by a CPU and its peripheral circuits. A non-volatile memory unit 19 stores identification data of a plurality of video signals and control data for controlling each processing unit in the scan conversion unit 10 by the control unit 18.
Reference numeral 20 denotes a manual setting unit for manually setting or controlling the control unit 18. Reference numeral 21 denotes a scan conversion device. Reference numeral 24 denotes a display unit for displaying the operation state of the scan conversion unit 10 or set data to the user of the apparatus. Reference numeral 22 denotes a display monitor for connecting and outputting an output video signal of the scan conversion device 21.

The operation of the above-configured scanning converter will be described below.

[0008] A plurality of computers 1
A, 1B, 2, and 3 video signals and synchronization signals are connected, and the number selection unit 6 in the signal switching unit 4
One of them is selected, and the signal is switched by the signal switch 5 for output. The selected video and synchronization signal 8 are converted by the scan converter 10 into the selected video and synchronization signal 8.
Is converted to a horizontal frequency or a vertical frequency different from the horizontal frequency or the vertical frequency of the display monitor 22.
Projected on

In the scan conversion unit 10, the synchronization signal identification unit 14 identifies the selected synchronization signal 8 such as the horizontal frequency, vertical frequency, polarity, and synchronization format, and outputs the result to the control unit 18. . The control unit 18 specifies the selected computer model based on the identification result and sets control data to each unit necessary for processing the video signal. Here, a conventional control data setting operation in the control unit 18 will be described with reference to FIG.

The control unit 18 constantly monitors the identification value from the synchronization signal identification unit 14, that is, the horizontal frequency, vertical frequency, polarity, synchronization type, and the like of the selected signal 8 (flow S
1). Then, whether or not the selected signal has changed is determined based on whether or not the identification value has changed (flow S
2). If it has not changed, the monitoring operation is continued, and if it has changed, a plurality of identification data already stored in the nonvolatile memory unit 19 are searched (flow S3). next,
If the stored identification data includes data that matches the identification value from the synchronization signal identification unit 14, control data unique to the identification data is read from the nonvolatile memory unit 19, and each unit in the scan conversion device 21 is read. When there is no matching data, a message prompting input of new data from the manual setting unit 20 is displayed on the display unit 24. In this way, the control data necessary for performing the scan conversion processing on the selected signal 8 is set.

The clock reproducing unit 15 receives the selected synchronization signal 8 and reproduces a clock whose phase is synchronized with the input. This is usually constituted by a PLL, and control data corresponding to the selected video and the synchronization signal 8 is set by the control unit 18. The clock phase control unit 16 slightly changes the phase of the clock with respect to the selected synchronization signal 8 so that the A / D conversion unit 11 can sample the selected video signal 8 synchronously at the optimum phase. To control. The volume 23 is a volume for manually performing the clock phase control. The clock phase control operation is usually performed by the display monitor 22 while viewing the video signal after the scan conversion processing on the screen, and the result is written as control data to the nonvolatile memory unit 19 via the manual setting unit 20 and the control unit 18. Once the adjustment is made, the control data is read out from the non-volatile memory unit 19 when the selected video and the synchronization signal 8 are input, so that the adjustment is not necessary again.

Further, since this adjustment operation is performed to absorb a minute timing variation between each computer, even if there are a plurality of the same models among a plurality of connected computers, each adjustment is performed. The above-mentioned clock phase adjustment is necessary for the computer.

[0013]

However, in the above configuration, even if there are a plurality of the same models or a plurality of computers connected to the scan conversion apparatus 21, even if the same models are not the same, the synchronization signal identifying unit is used. If the identification results are the same and cannot be distinguished, it is not possible to set optimal clock phase control data for each computer. This problem will be further described with reference to FIG.

In FIG. 3, when the computers 1A and 1B are of the same model, the horizontal frequency, the vertical frequency, the polarity, the synchronization type, and the like are the same regardless of which one is selected by the signal switching unit 4, so that the synchronization signal identification unit 14 There is no difference between the identification results. Therefore, even if the control unit 18 checks the identification data stored in the non-volatile memory unit 19 based on the identification result, the computers 1A and 1
B cannot be distinguished. For example, computer 1
When the control data of the clock phase for A is already stored in the nonvolatile memory unit 19, the computer 1
When B is selected, since the identification data is the same as that of the computer 1A in the control unit 18, the control data of the computer 1A is also read and set as the clock phase control data.

However, if there is a slight difference in the phase difference between the video signal and the synchronization signal between the computers 1A and 1B, the video signal of the computer 1B is converted into an A / D signal using the clock phase control data of the computer 1A. Since synchronous sampling is performed at step 11, the video signal cannot be synchronously sampled correctly. As a result, the screen after scan conversion displayed on the display monitor 22 is disturbed, or missing or incorrect screen information is generated. Therefore, every time the computer 1B is selected, the volume 23
The clock phase adjustment must be performed while looking at the screen displayed on the display monitor 22.

In view of the above problems, the present invention distinguishes between the computers connected to each other even when a plurality of computers are of the same model, or even when the models are different but cannot be distinguished by the identification of the synchronization signal, and is optimal for each computer. An object of the present invention is to provide a scan conversion device capable of selecting and setting control data.

[0017]

In order to solve the above-mentioned problems, a scan conversion apparatus according to the present invention comprises: a synchronizing signal identifying section for identifying a video signal by a synchronizing signal of an input video signal;
Generates a signal selection number corresponding to the input video signal
Signal selection number generator and identification corresponding to multiple video signals
Data and signal selection number from the signal selection number generator
If there is only one matching identification data, this identification
Control to control each part in the scan conversion device corresponding to the data
Data, if there is another matching data,
Stores control data corresponding to data and signal selection numbers
Generated from the non-volatile memory unit and the synchronization signal identification unit.
Identification value and signal selection number from the signal selection number generator
And identification data stored in the non-volatile memory unit;
Identification data that compares with the signal selection number and matches the identification value
If there is only one, the control data corresponding to this identification data
If there is other identification data that matches the identification value,
Separate data and control data corresponding to the signal selection number
Reads from the non-volatile memory unit, and each unit in the scan converter
And a control unit for controlling the

[0018]

According to the present invention, even if a plurality of computers are connected to the same model, or even if the models are different from each other but cannot be distinguished by the identification of the synchronization signal, the present invention makes it possible to determine the optimum control for each computer. Data can be selected and set.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A scanning conversion apparatus 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 scan conversion device according to one embodiment. FIG. 2 is a block diagram of a scan conversion device according to one embodiment, in which an input video signal is identified, and control data to be set in each section in the scan conversion device. It is an operation flowchart of a process of specifying. 1 and FIG.
4 and the same parts as those in FIG. 4 are denoted by the same reference numerals, and the description thereof will be omitted, and the configuration of the other parts will be described. Reference numeral 7 denotes a signal selection number generation unit that outputs the selection number of the video and synchronization signal from the computer selected by the number selection unit 6, and 9 denotes a signal selection number output from the signal selection number generation unit. The signal selection number value is stored simultaneously when the control data is stored in the nonvolatile memory unit 19 by the manual setting unit 20. The operation of the scanning conversion device configured as described above will be described below.

One of a plurality of computers connected to the scan converter 21 is selected by the number selection unit 6, and the signal is switched by the signal switching unit 5 accordingly. As a result, the selected video / synchronization signal 8 is output. You. Simultaneous signals result selected by the turn <br/> No. selector 6 is transmitted to the signal selection number generating unit 7, the signal selection number 9 corresponding to the selected number by the signal selection number generator 7 is output Is done. In the case of the above operation, even if the computer 1A and the computer 1B are of the same model, since the numbers are different, the signal selection number 9 has a different value when the computer 1A is selected and when the computer 1B is selected. . Addition (within the range described in [0011], etc.) “Write the signal selection number value and the corresponding clock phase control data to the nonvolatile memory.”

The control unit 18 specifies control data to be set in each unit in the scan conversion apparatus using the signal identification value from the synchronization signal identification unit 14 and the signal selection number 9 from the signal selection number generation unit 7. . The operation of the control unit 18 is shown in FIG.
This will be described with reference to FIG.

Steps S1 to S4 are the same as those described with reference to FIG. In the flow S4, if the identification data stored in the nonvolatile memory unit 19 includes data that matches the identification value from the synchronization signal identification unit 14, the identification data that matches is stored in the nonvolatile memory unit 19 in the same manner. It is searched whether it is stored (flow S
5). As a result, if there is only one matching identification data, the corresponding control data is read out and set in each section. If there is another matching data,
The signal selection number value stored for each piece of identification data is compared with the value of signal selection number 9 to select matching identification data, and the control data is used as a set value (flow S6).

Even if a plurality of matching identification data are stored in the nonvolatile memory section 19, if the value of the signal selection number corresponding to any of the identification data is different from the value of the signal selection number 9, a new one is newly added. Non-volatile memory 1
9 is displayed on the display unit 24 to the effect that writing is necessary. That is, by the above, the computer 1A and the computer 1
Even if B is the same model, independent control data can be read and set by storing the signal selection numbers respectively. Even if the computer 1A and the computer 1B are not the same model, if the identification result of the synchronization signal identification unit 14 is the same, it can be distinguished by processing using the signal selection number in the same manner.

As described above, according to the present embodiment, a plurality of computers can be connected by using the signal selection number generator and the signal selection number in addition to the identification data in the process of specifying the control data. Even if they are the same model, or even if the models are different but cannot be distinguished by the identification of the synchronization signal, they can be distinguished and the optimum control data for each computer can be selected and set.

[0026]

As described above, according to the scan conversion apparatus of the present invention, the computer connected by including the synchronization signal identification unit, the nonvolatile memory unit, the signal selection number generation unit, and the control unit is provided. Can be distinguished even if they are the same model or different models but cannot be distinguished by the synchronization signal identification, and the optimum control data can be selected and set for each computer.

[Brief description of the drawings]

FIG. 1 is a block diagram of a scan conversion device according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating an operation of the scan conversion apparatus according to an embodiment of the present invention.

FIG. 3 is a block diagram of a scan conversion control device in a conventional embodiment.

FIG. 4 is a flowchart for explaining the operation of a scan conversion apparatus according to a conventional embodiment.

[Explanation of symbols]

 Reference Signs List 4 signal switching unit 5 signal switching unit 6 number selection unit 7 signal selection number generation unit 14 synchronization signal identification unit 18 control unit 19 nonvolatile memory unit 21 scan conversion device

Continuation of the front page (56) References JP-A-5-27727 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04N 5/46

Claims (1)

(57) [Claims] A synchronizing signal identifying unit for identifying a video signal based on a synchronizing signal of the input video signal;
Signal selection number generation that generates the signal selection number corresponding to the signal
Unit, identification data corresponding to a plurality of video signals, and the signals
Signal selection number from signal selection number generator and matching identification
If there is only one data, it corresponds to this identification data
Control data for controlling each part in the scan converter
If there is other identification data, the identification data and signal selection
Non-volatile memory that stores control data corresponding to selection numbers
Unit, the identification value generated from the synchronization signal identification unit and the
The signal selection number from the signal selection number generator and the non-volatility
The identification data and the signal selection number stored in the memory
If there is only one identification data that matches the identification value
If the control data and identification value correspond to this identification data,
Identification data and signal when there is another matching data
The control data corresponding to the selection number is stored in the nonvolatile memory unit.
And a control unit for controlling each unit in the scan conversion device.