JP3008538B2 - Title display 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 display integrated with a camera and a title display device effective for use in a video editing device.

[0002]

2. Description of the Related Art In recent years, with the improvement of semiconductor technology, consumer videotape recorders (hereinafter abbreviated as VTRs) have been increasingly equipped with a memory and a digital function. Digital functions such as a title display device using a memory are also being installed in a consumer camera-integrated VTR.

[0003] A conventional title display device will be described below. FIG. 2 shows a block diagram of the conventional title display device.

In FIG. 2, a video signal input from a camera 1 is input to an adder 2 and also to an amplitude comparator 3. The signal output from the amplitude comparator 3 is input to the memory 4. The signal output from the memory 4 is added to the input signal by the adder 2 and output. The amplitude comparator 3
Data is input to the memory 4 from the CPU 6 inside the microcomputer 5. The microcomputer 5 includes a CPU 6 and a RAM 7, and the RAM 7 is configured to read and write signals from the CPU 6.

The operation of the conventional title display device configured as described above will be described below with reference to FIG.

The video signal input from the camera 1 is compared in amplitude with the data input from the microcomputer 5 by the amplitude comparator 3, converted into a binary data title signal and output. The output title signal is input to the memory 4. The title signal output from the memory 4 is added to the input signal by the adder 2 and output. Control data is input to the amplitude comparator 3 and the memory 4 from the CPU 6 of the microcomputer 5. Therefore, when writing the binary data from the amplitude comparison 3 to the memory 4, the CPU 6 of the microcomputer 5
Is recorded therein. Therefore, when confirming the storage state of the memory at the time of power-on or at the time of operation check, the R
This is performed by reading and judging the signal written in the AM 7 again by the CPU 6.

[0007]

However, in the above-described conventional configuration, the memory 4 and the RAM 7 in the microcomputer 5 are not provided.
Are not the same, there is a problem that the storage states do not always match and the microcomputer control becomes complicated.

The present invention solves the above-mentioned conventional problems, and proposes a title display device capable of detecting the storage state of the memory from the signal itself stored in the memory and detecting the storage state by a detection device external to the microcomputer. The purpose is to:

[0009]

In order to achieve this object, a title display device according to the present invention comprises a data generating means for binarizing an input video signal to generate title data, and judging a storage state of the title data and a memory. Memory storage means for storing a reference signal to be stored in a memory, a data signal read from the memory storage means, and a data addition means for adding and outputting the input video signal, and extracting a reference signal from the data signal to detect a storage state of the memory Storage state detecting means for performing the operation.

[0010]

According to the present invention, the storage state of the memory can be directly determined by detecting the reference signal inserted when writing the storage state of the memory into the memory when the reference signal is read from the memory again. Since the data is taken out directly from the memory and compared with the reference signal of the original, no detection control by the microcomputer is involved.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a title display device according to an embodiment of the present invention.

FIG. 1 is a block diagram of a title display device according to an embodiment of the present invention. However, the same components as those in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 1, a video signal input from a camera 1 is input to an adder 2 and also to an amplitude comparator 3. The signal output from the amplitude comparator 3 is input to the selector 8. The detection signal from the detection signal generator 9 is also input to the selector 8, and its output signal is stored in the memory 4.
Is input to Control data from the microcomputer 11 is also input to the amplitude comparator 3 and the memory 4. The signal output from the memory 4 is input to the adder 2 and the detector 1
Input to 0. The detection signal from the detection signal generator 9 is also input to the detector 10 and the output signal is
1 is input. The signal from the memory 4 input to the adder 2 is added to the signal from the camera 1 and output.

The operation of the title display device according to one embodiment having the above-described configuration will be described below with reference to FIG.

The video signal input from the camera 1 is compared in amplitude with the data input from the microcomputer 11 in the amplitude comparator 3, and is converted into a binary data title signal and output. The output title signal is partially switched by the selector 8 with the detection signal from the detection signal generator 9 and output. The title signal, which has been partially switched to the detection signal, is written into the memory 4 and read at any time according to a command from the microcomputer 11. The title signal read from the memory 4 is added to the input signal by the adder 2, output and added to the detector 10. In the detector 10,
The detection signal added to the title signal is used as a detection signal generator 9
It detects whether or not it matches the detection signal from the microcomputer 11 and outputs the detection result to the microcomputer 11. Therefore, when confirming the storage state of the memory at the time of power-on or at the time of operation check, the detection signal written in the memory 4 at the same time as the title signal is read again and the detection signal from the original detection signal generator 9 is read. They are compared and detected.

As described above, according to the present embodiment, by simultaneously writing the detection signal for detecting the storage state of the memory to the title signal to be stored in the memory, the storage state of the memory can be detected and the detection device external to the microcomputer can be used. The storage state can be detected.

The detection signal from the detection signal generator 9 is for detecting the storage state of the memory 4 and may be any signal that can write predetermined data to a predetermined address of the memory. Therefore, for example, a fixed value may be written to an arbitrary address of the memory within the blanking period of the video signal. In addition, it is possible to increase the detection accuracy by increasing the comparison data.

[0018]

As described above, according to the present invention, a detection signal for recognizing the storage state of the memory is added to the title signal, the data is written to the memory, and the state of the detection signal is compared with the original detection signal when reading from the memory. Thus, the storage state of the memory itself can be directly determined, and the control of the microcomputer is facilitated, and the practical effect is large.

[Brief description of the drawings]

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

FIG. 2 is a block diagram of a conventional title display device.

[Explanation of symbols]

 Reference Signs List 1 camera 2 adder 3 amplitude comparator 4 memory 8 selector 9 detection signal generator 10 detector 11 microcomputer

Claims (1)

(57) [Claims] 1. A data generating means for binarizing an input video signal to generate title data, a memory storing means for storing the title data and a reference signal for judging a storage state of the memory in a memory, and the memory storing means A data addition means for reading a data signal from the data signal, adding the data signal to the input video signal and outputting the data signal, and a storage state detection means for extracting the reference signal from the data signal and detecting a storage state of a memory. Title display device.