JPH05344471A - Video signal processing unit - Google Patents

Abstract

PURPOSE:To provide the video signal processing unit implementing signal processing such as thinning or complement of a picture element of a video signal. CONSTITUTION:The processing unit consists of a 1st A/D converter section 1, a 2nd A/D converter section 2, a 1st storage section 3, a 2nd storage section 4, a D/A converter section 5 converting data or the like into an analog signal, a clock generating section 6 to generate a clock signal used for write/read, a synchronization generating section 7 to generate a horizontal synchronizing signal and a vertical synchronizing signal, a key entry section 8 to enter a command such as how to process a signal and a control section 9 controlling each section.

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 device for digitizing a video signal of a television or the like and performing signal processing such as thinning out or complementing pixels.

[0002]

2. Description of the Related Art Conventionally, two home videos have been required to record two types of TV programs broadcast at the same time.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and inputs two types of video signals and outputs a video signal obtained by screen-synthesizing the two types of video signals. Input the video signal that the screen was synthesized,
An object of the present invention is to provide a video signal processing device that selects and outputs a signal for generating one type of screen among them.

[0004]

In order to achieve the above object, an AD for converting an input video signal into a digital signal.
Conversion means, storage means for storing the digital signal,
It comprises DA conversion means for converting data and the like read from the storage means into an analog signal, and control means for executing writing or reading with respect to the storage means.

[0005]

With the above configuration, the data of the digital signal obtained by AD-converting the first video signal is stored while being thinned, while the second video signal is obtained by AD-converting. The data of the digital signal is stored in a thinned state, and the two data are matched with a sync signal for reading, and in the first half of the horizontal scanning period, the data obtained from the first video signal is read in series. In the latter half of the horizontal scanning period, the data obtained from the second video signal is read out in series to output a composite video signal which divides the display screen into left and right to form two screens.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A video signal processing device according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram of a video signal processing device according to the present invention. Reference numeral 1 is a first AD conversion unit that inputs a first video signal 10 and outputs a digital signal, and 2 is a second AD conversion unit that inputs a second video signal 11 and outputs a digital signal. Reference numeral 3 is a first storage unit that stores digital data obtained from the first video signal 10, and 4 is a second storage unit that stores digital data obtained from the second video signal 11.
Reference numeral 5 denotes a video by analog-converting the data read from the first storage unit 3 and the second storage unit 4 according to the synchronization signal generated by the synchronization generation unit 7 and the video signal obtained by combining the synchronization signals. The DA converter outputs the signal 12. Reference numeral 6 is a clock generation unit that generates a clock signal used for AD conversion, DA conversion, or writing to or reading from a storage unit. Reference numeral 7 denotes a synchronization generation unit for generating a horizontal synchronization signal and a vertical synchronization signal for obtaining a reference time for reading data from the storage unit and for forming a video signal together with the data. Reference numeral 8 is a key input unit for inputting an instruction such as a signal processing method, and 9 is a control for writing data to the storage unit or reading data based on the signal processing instruction and controlling each unit. It is a department.

The operation will be described. FIG. 2 is a conceptual diagram showing a method of combining two different video signals into one video signal. Reference numeral 15 is a display screen based on the first video signal 10, and 16 is a display screen based on the second video signal 11. Reference numeral 17 denotes a display screen based on the video signal 12 in which the signals of the two types of video signals 15 and 16 are thinned to combine the signals in the first half and the second half of the scanning line. In the first AD converter 1, for example, the first video signal 10 is sampled with a clock having a frequency four times as high as that of the carrier color signal, and data obtained by quantizing with 8 bits is used as the sampling clock. Data is written in the first storage unit 3 while thinning out every other data by using a clock having a half frequency. On the other hand, the second video signal 11 is processed in the second AD conversion unit 2 in the same manner as described above, and is written in the second storage unit 4. Next, in synchronization with the horizontal synchronizing signal and the vertical synchronizing signal, the clock is read using a clock having a frequency four times as high as that of the carrier color signal. First, based on the first data stored in the first storage unit 3 obtained by AD-converting the first horizontal scanning line of the first video signal 10, the end of the first horizontal scanning line is obtained. The data up to is read. Then, by reading the data stored in the second storage unit 4 by the same method, the video signal to be displayed on the first horizontal scanning line of the display screen 17 is synthesized. By repeating the same reading method, the video signals to be displayed on the second and subsequent scanning lines are combined. After synthesizing the video signal of the last scanning line, the process returns to the reading and synthesizing process of the first scanning line.

FIG. 3 is a block diagram showing an application example in which the video signal processing apparatus according to the present invention is used as a home video interface. 20 is two kinds of video signals 10
The video signal processing device according to the present invention outputs the video signal 12 obtained by DA conversion of the composite video signal by inputting 11 and 11. Reference numeral 30 is a system for inputting two audio stereo signals of the first video signal 10 and the second video signal 11, and, for example, is the same as the stereo audio signal (L) 31 which is paired with the first video signal 10 ( R) 32 is an audio switching unit that outputs a monaural audio signal 35 paired with the first video signal 10 by adding R) 32. 33 is a stereo audio signal (L) paired with the second video signal 11, and 34 is the same stereo audio signal (R). Reference numeral 36 is a monaural audio signal which is paired with the second video signal 11 obtained by the same processing as the monaural audio signal 35. A case of recording two programs on one home video will be described. Since the video is combined with the video signal 12 as described above, it is recorded in the home video as it is.
After converting a stereo signal into a monaural signal, the sound is recorded on the stereo L and R channels of the home video, respectively.

The reproduction will be described. When the video signal 12 composed of the composite video signal is displayed as it is, a two-screen display such as 17 shown in FIG. 2 can be obtained. In addition, a video signal 12 is input instead of the video signal 10, and data obtained by AD converting the video signal 12 is horizontally scanned in order, for example, by scanning line by image in a display screen. The data stored in the image of the display screen after being stored in the memory unit 3 of the first scanning line are sequentially read from the data corresponding to the first scanning line in accordance with the horizontal scanning to be read, and the first half data of each horizontal scanning line is read. By reading out with a clock having a frequency half the write clock frequency, it is possible to complement the horizontal pixel with the previous pixel and select the screen on the left half of the combined signal to display it on the entire screen. In addition, audio reproduction is performed by, for example, audio signal (L).
Instead of 31 and the same (R) 32, monaural audio signals 35 and 36 are input, and audio paired with the video signal to be displayed, for example, monaural audio signal 35 paired with the first video signal 10. Select.

[0010]

As described above, two different video signals can be combined into one video signal, and the combined video signal can be divided into the original video signal. You can record and play two programs on a home video of a single unit. Therefore, it is useful for applications such as recording in the video field and expansion of use.

[Brief description of drawings]

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

FIG. 2 is a conceptual diagram showing a method of combining two different video signals into one video signal.

FIG. 3 is a block diagram showing an application example in which the video signal processing device according to the present invention is used as a home video interface.

[Explanation of symbols]

1 1st AD conversion part 2 2nd AD conversion part 3 1st storage part 4 2nd storage part 5 DA conversion part 6 Clock generation part 7 Synchronization generation part 8 Key input part 9 Control part 10 1st video Signal 11 Second video signal 12 Video signal 15 Display screen based on first video signal 16 Display screen based on second video signal 17 Display screen based on combined video signal 20 Video signal processing unit 30 Audio signal switching unit 31 Stereo audio signal (L) 32 paired with the first video signal Stereo audio signal (R) 33 paired with the first video signal 33 Stereo audio signal (L) paired with the second video signal 34 Stereo audio signal (R) paired with second video signal 35 Monaural audio signal paired with first video signal 36 Monaural audio signal paired with second video signal

Claims (2)

[Claims] 1. An AD conversion means for converting an input video signal into a digital signal, a storage means for storing the digital signal, a DA conversion means for converting data or the like read from the storage means into an analog signal, A video signal processing device, comprising: a control unit that executes writing or reading to or from a storage unit. 2. A first AD converter for converting the input first video signal into a digital signal, a second AD converter for converting the input second video signal into a digital signal, and the first AD converter. A first storage unit for storing digital data obtained from a video signal and a second storage unit for storing digital data obtained from the second video signal;
A DA converter that converts data and the like read from the first storage unit and the second storage unit into an analog signal, and a clock signal used for AD conversion, DA conversion, or writing to and reading from the storage unit Clock generating section, a synchronization generating section for generating a horizontal synchronizing signal and a vertical synchronizing signal for obtaining a reference time for reading data from the storage section and for forming a video signal together with the data, a signal processing method, etc. And a key input unit for inputting an instruction, and a control for controlling each unit while writing data to or reading data from the first storage unit and the second storage unit based on the signal processing instruction. The video signal processing device according to claim 1, which comprises a unit.