KR20000031628A - Method and system for converting pip image in digital signal processing - Google Patents

Abstract

PURPOSE: A system is provided to automatically select one signal from plural inputted video signals without artificial manipulation for generating and converting into the Picture In Picture(PIP) image. CONSTITUTION: Plural composite video signals inputted through a video input unit(1) such as a camera are converted into digital signals by a decoder(3). Then, a PC synthesizes the data transferred from a Digital Signal Processor(DSP)(23) of plural audio systems for deciding which audio system generating a real audio signal to transfer to a controller(5) of a video system. A frame buffer(4) switches the digital signal into the frame unit of a PIP image or generates the PIP image on a background image according to the transferred content, and the PIP image is converted into the image of the inputted audio direction for being outputted to a video outputting unit(10) such as a TV, a VCR, or a slide projector through an encoder(6) and an analog video switching unit(8).

Description

P.I.P Converting Method & It's System in Digital Signal-Treating Field

The present invention relates to a method and system for converting a PIP screen in digital signal processing, and more particularly, converts a video input signal from a medium such as a PC, a TV, a VCR, a light projector, a slide projector, a camera, or the like. PIP) PIP screen switching in digital signal processing in which audio signals are recognized and PIP screens are automatically converted to screens in which audio signals are input in digital signal processing integrating partial technology of screen processing, digital video switching or graphic overlay. It relates to a method and a system thereof.

In the past, digital signal processing was independently processed between media.

For example, the technology for converting analog RGB signals into composite video signals has been commercialized so that PC monitor screens can be viewed on TV screens, and PIP (Picture In Picture) screen processing technology has already been applied to TVs and commercialized. The technology for processing graphics and graphic overlays is also implemented in products such as CCTV dividers, but they are not integrated into one system.

In order to solve this problem, a digital signal processing method and a system have been previously filed (Application No. 98-40951), which will be described with reference to FIG. 1.

1 is a block diagram of a pre-applied digital signal processing system.

The system splits the input analog RGB signal into an RGB composite signal, one of which is amplified and video output, and one of which is converted into a digital signal and converted into a composite video signal and an S-VHS signal. And a decoder unit 3 for converting a plurality of composite video signals input into a digital signal, a frame buffer unit 4 for switching the digital signal in units of frames of a PIP screen and generating a PIP screen on a background screen. An overlay memory unit 7 for overlaying a desired character, figure or graphic shape on the digital video screen, an encoder unit 6 for converting the overlaid video screen into a composite video signal and an S-VHS signal, and the encoder Select one of the video signal output from the unit 6 and the video signal output from the analog RGB / CVBS converter 9 Analog video switch unit 8 for outputting false, the decoder unit 3, frame buffer unit 4, encoder unit 6, overlay memory unit 7, analog video switch unit 8, analog RGB / It consists of the control part 5 which controls the CVBS conversion part 9 integratedly.

It integrates various video signals input through various media into a single system, converts them into digital signals, and then outputs them to video signals. Separate output is possible even at the same time.

Reference numeral 13 denotes a graphic overlay circuit composed of an overlay memory unit 7 and an encoder unit 6.

The above-described technology for digital signal processing of the input video signal can be applied to various fields, and is particularly useful for lecture recording through multimedia or remote video lecture education system through the Internet.

The input of external voices or sounds (hereinafter referred to as 'audio') during lectures through multimedia or distance education through the Internet is usually input through a microphone and output through a speaker.

Therefore, the screen in the direction in which audio is input should be video output. For example, the learner asks a question and the audio is output to the learner's voice, but the instructor's voice is output to the video. The appearance should not be video output.

In addition, there is a need to check the attendance of learners when they want to check the attendance of learners during remote lectures through the Internet. In the past, the instructor manipulated the attendees on the PC. There was an inconvenience in outputting to the video screen.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and a plurality of video signals to be input are actually generated and controlled by an input audio signal, and a video signal input through an audio input direction is generated and converted into a PIP screen. By outputting the video signal in the same direction as the input direction of the audio on the PIP screen, the video can be seen on the background screen, so that students can check the attendance of the class during the remote image lecture over the Internet and provide face-to-face effects between the instructor and the learner. It can increase the effectiveness and provide the instructor with the convenience of the lecture when the lecturer lectures in the classroom, making it easier for learners to understand the contents of the lecture. Even instructors can check each other's voice The purpose of the present invention is to provide a PIP screen switching method and system in digital signal processing that can enhance the educational effect of remote lecture.

In order to achieve the above object, the present invention is that the input analog audio signal is amplified and branched, one is output as an analog audio signal and the other is converted into a digital audio signal is input to the DSP, the input audio signal is actually Whether the sound is a sound is periodically determined and output to the PC as a preset signal, and the actual sound sound determination of the PC is transmitted to the video side; A plurality of video signals inputted to the video side are converted into digital signals, the video signal on the actual audio generation sound side is switched in units of frames, and a PIP screen is generated and switched on the background screen; The present invention provides a method of converting a PIP screen in digital signal processing, wherein a PIP screen is output as a video in an audio direction.

In order to achieve the above object, the present invention provides an audio signal amplifying unit for amplifying the input analog audio signal, and the amplified input analog audio signal is divided into two signals, one is converted into a digital signal and one is an analog signal An audio system comprising: an A / D audio signal converting unit for outputting audio to a computer; and a DSP for periodically determining whether an input digital signal is an actual sound generated and outputting the signal to a PC as a preset signal; A decoder unit for converting a plurality of composite video signals input into a digital signal, a frame buffer unit for switching the digital signal on a frame basis of a PIP screen to generate a PIP screen on a background screen, and a video signal that has passed through the frame buffer unit An encoder unit for converting a composite video signal and an S-VHS signal, an analog video switch unit for video outputting the video signal output from the encoder unit, and a digital signal in which a frame buffer unit is input in accordance with the DSP signal is used on a PIP screen. A controller configured to switch on a frame basis or to generate a PIP screen on a background screen; It is intended to provide a PIP screen switching system in the digital signal processing characterized in that the configuration.

1 is a block diagram of a pre-applied digital signal processing system;

2 is a block diagram of an audio system according to the present invention;

3 is a connection block diagram of FIGS. 1 and 2 in accordance with the present invention;

<Description of the symbols for the main parts of the drawings>

1,2: video input, 3: decoder, 4: frame buffer, 5: controller, 6: encoder, 7: overlay memory, 8: analog video switch, 9: analog RGB / CVBS converter, 10 11: video output, 20: audio input, 21: audio signal amplifier, 22: A / D audio signal converter, 23: DSP, 24: audio output.

Hereinafter, the present invention will be described with reference to the accompanying drawings, FIGS. 2 to 3.

2 is a block diagram of an audio system according to the present invention, and FIG. 3 is a connection block diagram of FIGS. 1 and 2 according to the present invention.

First, the basic configuration of the screen switching method of the present invention, the input analog audio signal is amplified and branched, one is output as an analog audio signal and the other is converted into a digital audio signal is input to the DSP 23, input Whether the determined audio signal is the actual sound generation sound periodically and outputted to the PC as a preset signal, and the actual sound sound determination of the PC is transmitted to the video side;

A plurality of video signals inputted to the video side are converted into digital signals, the video signal on the actual audio generation sound side is switched in units of frames, and a PIP screen is generated and switched on the background screen;

The video is output as a screen of an audio direction in which the PIP screen is input.

Basic configuration of the screen switching system of the present invention, the audio signal amplifier 21 for amplifying the input analog audio signal, and the amplified input analog audio signal is divided into two signals, one is converted into a digital signal One is an A / D audio signal converter 22 for outputting audio as an analog signal, and a DSP 23 for periodically determining whether the input digital signal is an actual sound or not and outputting the signal to a PC as a preset signal. An audio system;

A decoder unit 3 for converting a plurality of composite video signals input into a digital signal, a frame buffer unit 4 for switching the digital signal in units of frames of a PIP screen and generating a PIP screen on a background screen, and the frame An encoder unit 6 for converting the video signal passed through the buffer unit 4 into a composite video signal and an S-VHS signal, and an analog video switch unit 8 for video outputting the video signal output from the encoder unit 6. And a controller (5) for causing the frame buffer unit (4) to switch the input digital signal in units of frames of the PIP screen or to generate a PIP screen on the background screen according to the signal of the DSP 23. Into the system;

Characterized in that configured.

Hereinafter, the present invention will be described in more detail. In the present invention, an input / output audio signal is an analog signal.

The analog audio signal input through the audio input unit 20 such as a microphone is amplified through the audio signal amplifier 21.

The amplified analog audio signal is branched into two signals through the A / D audio signal converter 22, and one is output to the audio output unit 24 that amplifies the audio output such as an external speaker or an audio mixer, and the other. Is converted into a digital signal and output to the DSP 23.

The A / D audio signal converter 22 is composed of a filter processing part and an A / D converter IC.

The DSP ((23), Digital Signal Processor) measures the absolute value of the input digital audio signal to determine the volume of the input digital audio signal, and measures the movement of the continuous signal to measure the audio signal due to the generation of the actual sound. Determine if it is.

As described above, the operation of determining the input digital audio signal is performed at regular intervals and transmitted to the PC through the bus (PC ISA BUS) at a predetermined value.

The above-mentioned audio system is mounted on the PC as many times as necessary, and the screen switching system is constituted like a video system that is pre- filed.

In the state where a plurality of composite video signals input through a video input unit 1 such as a camera is converted into a digital signal by the decoder unit 3, the PC synthesizes data from the DSP 23 of the plurality of audio systems. The audio system determines which audio signal is actually generated in the audio system, and transmits to the control unit 5 of the video system which audio signal is currently input.

The control unit 5 converts the PIP screen into an input audio direction screen by causing the frame buffer unit 4 to switch the digital signal in frame units of the PIP screen or to generate a PIP screen on the background screen according to the contents of the transmission. The video is outputted to the video output unit 10 such as a TV, a VCR, and a slide projector through the unit 6 and the analog video switch unit 8.

When multiple audio signals are generated at the same time, the screen is switched according to the priority of audio.

That is, the video signal of the audio signal direction actually generated among the video signals input through the video input unit 1, such as a camera, is generated and converted into a PIP screen by the frame buffer unit 4 to output the video output unit 10. The PIP screen is displayed on the background screen.

As such, it is convenient to automatically select and control a single signal from a plurality of video signals inputted through the video input unit 1 such as a camera without the on / off operation or artificial manipulation of the camera to generate and switch to a PIP screen. In addition, by applying multimedia teaching or remote video lecture, the learner's or instructor's image is output on the PIP screen, which not only induces the instructor or learner's interest in education and lecture, but also like the conventional classroom on the Internet during remote lecture. The learner's face is automatically displayed on the screen without the instructor or other learners operating the PC, which can give face-to-face effects between the instructor and the learner, thereby improving learning efficiency.

In addition, when the learner calls the learner's name in the existing classroom, the learner's face is displayed on the PC by the audio signal of the learner who answers, and thus it is easy to check whether the learner is present.

As described above, in the present invention, a plurality of input video signals are actually generated and controlled by an input audio signal, and a video signal input through an audio input direction is generated and converted into a PIP screen so that an audio input direction is input. The video signal in the same direction as the PIP screen can be output on the background screen, and one of the video signals input through the video input unit is automatically selected without the camera's ON / OFF operation or artificial manipulation to the PIP screen. It is convenient to create and switch, and can also check whether a student attends a class in a remote video lecture through the Internet, and enhance the educational effect by providing face-to-face effects between the instructor and the learner. Instructor instructor while providing lecturer convenience It is a useful invention that can improve the educational effect of remote lectures by making it easier to understand the voice and face of each other, as well as between learners and instructors, regardless of location. .

Claims (2)

The input analog audio signal is amplified and branched, one is output as an analog audio signal, and the other is converted into a digital audio signal and input to the DSP 23, and the input audio signal is periodically determined whether or not the actual sound is generated. Outputted to the PC as a preset signal and the actual sound discrimination of the PC is transmitted to the video side; A plurality of video signals inputted to the video side are converted into digital signals, the video signal on the actual audio generation sound side is switched in units of frames, and a PIP screen is generated and switched on the background screen; The PIP screen switching method of the digital signal processing, characterized in that the video output to the screen in the audio direction input. Audio signal amplifying unit 21 for amplifying the input analog audio signal and A / D audio for branching the amplified input analog audio signal into two signals, one of which is converted into a digital signal and one of which is output as an analog signal. An audio system comprising a signal converter 22 and a DSP 23 for periodically determining whether the input digital signal is an actual sounding sound and outputting the signal to a PC as a preset signal; A decoder unit 3 for converting a plurality of composite video signals input into a digital signal, a frame buffer unit 4 for switching the digital signal in units of frames of a PIP screen and generating a PIP screen on a background screen, and the frame An encoder unit 6 for converting the video signal passed through the buffer unit 4 into a composite video signal and an S-VHS signal, and an analog video switch unit 8 for video outputting the video signal output from the encoder unit 6. And a controller (5) for causing the frame buffer unit (4) to switch the input digital signal in units of frames of the PIP screen or to generate a PIP screen on the background screen according to the signal of the DSP 23. Into the system; PIP screen switching system in the digital signal processing, characterized in that configured.