KR100258522B1 - Circuit and method for translating audio signal of a pc/tv/vcr - Google Patents

Abstract

PURPOSE: A circuit for converting PC/TV/VCR audio signals and a converting method thereof are to reduce a burden of a main system for a multi-media computer by selecting a TV audio signal, a video audio signal and a PC audio signal automatically. CONSTITUTION: An audio signal selecting unit(60) detects an audio signal and selects the detected audio signal to generate an OSD data in response to an audio selection signal, a color gain control signal and an audio signal. An OSD unit(45-1) receives the OSD data in response to the audio signal and outputs an OSD gain signal. A video pre-amp(45-2) receives the color gain control signal and a video signal generated from a PC and amplifies the received video signal to a predetermined level. A video main amp(45-3) receives and amplifies the video signal and the OSD gain signal. A CRT(55) displays the video signal and the OSD signal. An audio pre-amp(65) amplifies the selected audio signal to a predetermined level in response to the audio selection signal. An audio main amp(70) receives and amplifies the audio signal. A speaker(75) outputs the audio signal which is generated from the audio main amp.

Description

PC / TV / VCR audio signal switching circuit and method

The present invention relates to a PC / TV / VCR audio signal switching circuit and method. More particularly, the present invention relates to a PC / TV / VCR audio signal switching circuit and method for selecting and outputting audio signals output from a PC, To a PC / TV / VCR audio signal switching circuit and method.

In recent years, computers have been multimedia-based, such as audio, video, TV, game machines, and wireless communication devices. Multimedia computers require many cards, such as TV reception cards, video cards, fax and communication cards, in order to have functions such as TV, video, and fax. In order to install the various cards in the computer main body, space limitation of the main body is somewhat generated.

In order to solve this problem, a monitor has been recently manufactured to have a function of receiving a TV broadcast signal, a video signal, or the like. Accordingly, there is a need for a circuit and a method for more effectively selecting and outputting an audio signal separated from each of these signals in a monitor capable of receiving a TV broadcast signal, a video signal, or the like.

An object of the present invention is to provide a PC / TV / VCR audio signal switching circuit and method capable of automatically selecting and outputting TV / VCR / PC audio signals in a monitor having a TV receiving function and a video function.

According to an aspect of the present invention, there is provided a circuit for converting a PC / TV / VCR audio signal in a monitor, the circuit comprising: an audio selection signal for detecting an audio signal to select the audio signal, An OSD unit for receiving the OSD data according to the audio signal and outputting an OSD gain signal, and an OSD unit for receiving the color gain control signal and outputting a video signal output from the PC A video main amplifier for receiving and amplifying the video signal and the OSD gain signal; a CRT for receiving and displaying the video signal and the OSD signal; The audio selection signal is applied and the audio signal selected according to the audio selection signal Received is an audio pre-amplifier and the audio signal amplified tongue is characterized by consisting of a main and an audio amplifier for final amplification, the speaker for outputting the audio signal outputted from the main audio amplifier.

1 is a block diagram showing an audio signal switching circuit of a PC / TV / VCR combined monitor according to the present invention.

FIG. 2 is a block diagram showing the audio signal selecting means shown in FIG. 1 in detail. FIG.

FIG. 3 is a circuit diagram showing the audio input signal detecting jack Jack of FIG. 2 in detail.

4 is a circuit diagram illustrating an embodiment of the audio input signal sense jack Jack of FIG.

5 is a circuit diagram showing a preferred embodiment of the audio signal selecting means according to the present invention.

6A and 6B are a circuit diagram and a truth table showing a first embodiment of the switching circuit shown in FIG.

7 is a circuit diagram showing a second embodiment of the switching circuit shown in Fig.

8 is a flowchart illustrating an audio signal selecting method according to the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention will now be described with reference to the accompanying drawings.

As shown in FIG. 1, the PC / TV / VCR audio signal switching circuit according to the present invention includes a PC 10 for executing a program and outputting a video signal and an audio signal according to a result of the execution, A VCR 20 for reproducing video and audio signals, a video selecting means 25 for selecting a video signal output from the tuner 15 and the VCR 20, A chroma integrated circuit (IC) 30 for synthesizing image signals selected and output from the chroma IC 30 to adjust the color tone, an R A double scanning means 35 for receiving the R, G and B signals and modulating the input R, G and B signals at the monitor frequency; Video switching means 40 for switching R, G and B signals outputted from the PC / A video amplifier 45 for receiving the R, G and B signals outputted from the video switching means 40 and for amplifying the inputted R, G and B signals; A CRT 55 that displays R, G, and B signals using a video signal output from the video amplifier 45 and a synchronization signal output from the deflection unit 50; An audio selecting means 60 for receiving and selecting an audio signal output from the PC 10, the tuner 15 and the VCR 20; An audio main amplifier 70 for amplifying an audio signal outputted from the audio preamplifier 65 and an audio preamplifier 65 for finally outputting the audio signal outputted from the audio main amplifier 70 A speaker 75, a TV signal, a VCR signal, and a PC signal, And a remote controller 80 for controlling the remote controller.

The operation according to this will be described in more detail as follows.

The TV image signal received by the TV antenna 15-1 receiving the TV broadcast signal is received by the tuner 15 in the monitor and amplified and selected to separate the TV image signal into a TV video signal and a TV audio signal. The TV video signal separated by the tuner 15 and the VCR video signal reproduced and output from the VCR 20 are input to the video selecting means 25. [ The input TV video signal and the VCR video signal output the video signal selected by the video selecting means 25 according to the user's selection. For example, when the user selects the TV video signal using the remote controller 80, the video selecting means 25 outputs the TV video signal. When the VCR video signal is selected, the VCR video signal is output through the video selecting means 25. [

The TV video signal inputted to the video selecting means 25 is inputted as a composite signal in which a synchronizing signal is overlapped. The VCR video signal is input by separating a color difference signal and a luminance signal. Also, according to the specification of the signal system (NTSC, PAL, SECAM), the signal band, horizontal and vertical deflection frequencies of the TV video signal are determined. This composite signal is limited by the video signal and the horizontal / vertical synchronization signal output from the deflection unit 50, and it is impossible to freely select the frequency between the video band, the color carrier, and the horizontal and vertical deflection frequencies. In addition, the VCR video signal is input by separating the color difference signal and the luminance signal.

In order to distinguish the TV video signal from the VCR video signal, the video selecting means 25 receiving the TV video signal and the VCR video signal supplies the composite signal of the TV and the luminance signal of the VCR to the switching means, A signal separator, a combination filter, and the like (not shown) to select a TV video signal and a VCR video signal. For example, if the TV video signal is selected through the switching means, the selected TV composite signal is separated from the synchronizing signal through the synchronizing signal separator, and the separated synchronizing signal is supplied to the horizontal and vertical circuits Not shown). In addition, the TV composite signal excluding the synchronization signal is separated into a luminance signal and a color difference signal through a combination filter. The separated luminance signal is applied to the chroma IC 35, and the remaining color difference signals are applied to the switching means (not shown).

The switching means to which the chrominance signal of the TV is applied applies the chrominance signal, from which the synchronous signal is separated, out of the chrominance signals output from the VCR 20 to the chroma IC 30. And selects one of the color difference signal of the TV and the color difference signal of the VCR 20. Since the present TV composite signal is currently selected, the switching means turns on the color difference signal of the TV applied separately from the combination filter. The chroma IC 30 receives the chrominance signals and luminance signals output from the TV and is synthesized by the chroma IC 30 and output as R, G, B, or Y, RY, BY signals . In order to display such an output signal on a widescreen, it is necessary to process the signal. That is, the color output signals in the analog state such as R, G, and B signals or Y, R-Y, and B-Y are converted into digital signals using an analog to digital converter (not shown).

The color signal converted into a digital signal is converted into a screen signal having a ratio of 4 × 3 in the aspect ratio to a screen signal having a ratio of 16 × 9 in the width to the height, through the Aspect Ratio Conversion circuit. And then converted to an analog signal by a frequency double scan unit 35 and again by a digital to analog converter (not shown). Thus, a frequency-multiplied video signal having an aspect ratio of 9: 16 is obtained. When a VCR video signal is selected through the video selection means 25, a luminance signal of the VCR video signal is selected and the selected luminance signal is input to the chroma IC 30 through the combination filter. Further, the color signal is separated into a sync signal and input to a microcomputer (not shown), and the remaining color signal is applied to the switching means. The switching means, which receives the hue signal from which the synchronizing signal is separated from the VCR image signal, inputs the color difference signal of the VCR to the hue circuit by the microcomputer. G, B, or Y, R-Y, and B-Y signals, which are synthesized by the chroma IC 30 that receives the luminance signal and the color tone signal of the VCR 20.

The output signal is converted to an analog signal by a D / A converter through a double scanning means 35. [ Thus, a frequency-multiplied video signal having an aspect ratio of 9: 16 is obtained. The video signals of the TV and the VCR 20 multiplied by the double scanning means 35 are switched through the P / C video switching means 40. [ The PC / video switching means 40 outputs a TV or a video signal when the TV or VCR video signal is selected, and selects the PC video signal when the PC video signal is selected. When the PC video signal or the TV or VCR video signal is selected through the PC / video switching means 40, the selected PC video signal or TV or VCR video signal is input to the video amplifier 45. The video amplifier 45 receiving the PC video signal or the TV or VCR video signal amplifies the input video signal and applies the amplified video signal to the CRT 55 to finally output the amplified video signal to the screen of the monitor 90 .

The audio signals output from the TV and VCR 20 and the PC 10 are selected through the audio selection means 60. [ The audio selecting means 60 receiving the audio signals output from the tuner 15 and the VCR 20 and the PC 10 receives the audio signals outputted from the TV and the VCR 20 and the PC 10, . The audio signal selected through the audio selection means 10 is applied to the audio pre-amplifier 65. The audio pre-amplifier 65 receiving the audio signal amplifies the audio signal up to a predetermined level and outputs the amplified audio signal. The audio signal amplified through the audio pre-amplifier 65 is amplified to an audio signal level through the audio main 70 and input to the speaker 75. The speaker 75 receiving the audio signal amplified up to the audio signal level outputs the audio signal.

For example, when the PC audio signal output from the PC 10 is selected by the operation of the remote controller 80 and applied to the monitor 90, the applied PC audio signal is selected and output through the audio selection means 60 . Also, when the VCR signal is selected through the remote controller 80, the audio selecting means 60 selects the VCR signal as the input audio signal. When the TV is selected, the audio selecting means 60 selects the TV audio signal Output. In this way, the PC audio signal, TV audio signal, and VCR audio signal selected and output by the audio selection means 60 are amplified through the audio pre-amplifier 65. The PC audio signal, the VCR audio signal, and the TV audio signal output from the audio pre-amplifier 65 are amplified through the audio main amplifier 70, and the amplified audio signal is output through the speaker 75. The video signal and the audio signal are subjected to a first half control operation such as reduction and enlargement of the screen and color and volume control through the interface between the monitor 90 and the remote controller 80.

The audio selecting means 60 for selecting an audio signal from the monitor 90 will be described in detail with reference to the accompanying drawings.

An audio input signal detection jack 60-1 and an audio input signal detection jack Jack 60-1 in an audio selection means 60 for detecting an audio signal and outputting a sensed audio signal, 60-1 and outputs an audio selection signal according to the detected audio signal, generates an OSD data according to the audio signal, and controls an OSD data generated. (H / V-SYNC) outputted from the microcomputer 60 (FIG. 1) and outputting a color gain control signal according to the horizontal and vertical sync signals And an OSD unit 45-1 for receiving the OSD data according to the audio signal output from the microcomputer 60-2 and processing the OSD data according to the applied audio signal to output an OSD gain signal, G and B received from the PC 10 and receiving the color gain control signal from the audio signal selecting means 60 and amplifying the applied video signal to a predetermined level The video preamplifier 45-2 and the video preamplifiers 45-2 and 45-1 and the OSD gain signal 454 according to the audio signals output from the OSD unit 45-1, (R, G, B) output from the video main amplifier 45-3 and an OSD signal according to an audio signal to display a CRT An audio preamplifier 65 receiving the audio selection signal output from the audio signal selector 60 and amplifying the selected audio signal according to the applied audio selection signal to a predetermined level, And outputs the audio signal output from the audio decoder 65 Is received consists of a speaker 75 for outputting the audio signal outputted from the audio main amplifier 70 and the audio main amplifier 70 for final amplification.

This configuration will be described in more detail as follows.

When the respective audio signals are outputted from the PC 10, the tuner 15 and the VCR 20 shown in FIG. 1, the output audio signals are supplied to the audio input signal detecting jacks Jack 60 -1). The microcomputer 60-2 detects an audio signal output from an audio input signal detecting jack (Jack) 60-1 which detects the audio signal and outputs the detected audio signal. The microcomputer 60-2 in the audio selection means 60 which senses the audio signal executes the stored audio signal control program and outputs the detected audio signal. In addition, the microcomputer 60-2 receives horizontal and vertical synchronizing signals (H / V / -SYNC) for synchronizing the video signals outputted from the PC 10. The microcomputer 60-2 receiving the horizontal and vertical sync signals H / V-SYNC outputs the color gain control signals according to the applied horizontal and vertical sync signals H / V-SYNC. The color gain control signal outputted from the microcomputer 60-2 is applied to the video pre-amplifier 45-2 to control the color gain of the video signals R, G and B. In this way, the video pre-amplifier 45-2 receives the color gain control signal and controls the phase signals R, G, and B according to the applied color gain control signal and outputs the controlled video signals R, G, Amplified to a predetermined level and output. The video main amplifier 45-3 receiving the video signals R, G and B finally amplifies the applied video signals R, G and B and outputs the video signals R, G and B through the CRT 55 , B) are displayed.

The OSD unit 45-1 receives the OSD data according to whether the audio signal output from the microcomputer 60-2 having the audio signal control program is detected. The OSD gain signal corresponding to the audio signal output from the OSD unit 45-1 which is supplied with the OSD data according to whether or not the audio signal is detected is applied to the video main amplifier 45-3. The OSD gain signal according to the applied audio signal is finally amplified by the video main amplifier 45-3 and displayed on the CRT 55. [ When the OSD screen displayed on the CRT 55 is not generated, the user can display information corresponding to the OSD screen so that the user can check it.

For example, when the user selects the PC audio signal, the microcomputer 60-2 detects the selected PC audio signal. At this time, if the microcomputer 60-2 can not detect the PC audio signal, the microcomputer 60-2 outputs OSD data indicating that no audio signal is detected. The OSD data output in this manner is processed by the OSD unit 45-1 to output an OSD gain signal. The output OSD gain signal is applied to the video main amplifier 45-3 and amplified and displayed through the CRT 55. [ In this way, the information according to the absence of an audio signal on the OSD screen can be displayed and confirmed by the user. Conversely, when the user selects the PC audio signal and the selected PC audio signal is detected by the microcomputer 60-2, the audio selection signal corresponding to the PC audio signal is output. The audio pre-amplifier 65 receiving the PC audio selection signal output from the microcomputer 60-2 receives the PC audio signal from the audio input signal detection jack (JACK) 60-1 in response to the applied PC audio selection signal, The audio signal is amplified to a predetermined level and output. The audio main amplifier 70 receiving the PC audio signal output from the audio pre-amplifier 65 finally amplifies the applied PC audio signal and outputs it through the speaker 75. In addition, the TV audio signal output from the tuner 15 and the VCR audio signal output from the VCR 20 are selected and outputted through the same process as the PC audio signal.

An audio input signal detection jack (Jack) 60-1 for detecting an audio signal will be described in detail with reference to the accompanying drawings.

3, the audio signal detection jack 60-1 includes an audio input signal detection jack terminal 60-1-1 for receiving a stereo audio signal, a stereo audio input signal detection jack And a plurality of resistors R1 to R4 and capacitors C1 for switching according to whether a stereo audio signal is applied to the Jack terminals 60-1-1.

In the above configuration, the stereo audio input signal jack terminal 60-1-1 is connected to the left of the stereo audio signal and the L-audio signal sense lead receiving the audio signal. (60-1-2) and an R-audio signal sensing lead (60-1-3) receiving a right (hereinafter abbreviated as R) audio signal in the stereo audio signal.

The operation according to this configuration will be described as follows.

If the audio signal output from the PC 10, the VCR 20 and the tuner 15 shown in FIG. 1 is a stereo audio signal, the output stereo audio signal is supplied to the stereo audio input signal detection jack terminal 60-1 -1). For example, when a PC L-audio signal is output from the PC 10, the PC-L audio signal is applied to the L-audio signal sensing lead 60-1-2 through an impedance matching resistor R3 . In addition, the PC R-audio signal output from the PC 10 is received at the R-audio signal sensing lead 60-1-3 through an impedance matching resistor R4.

When the L-audio signal and the R-audio signal are received, the audio input signal detection jack (Jack) 60-1 turns on the first switch SW1 to output the PC stereo audio signal. The output PC stereo audio signal is output to the DC voltage V _CC1 applied through the resistor R 1 through the resistor R 2. At this time, the capacitor C1 is used for removing noise. The PC stereo audio detection signal output through the resistor R2 is received by the microcomputer 60-2. The microcomputer 60-2 receiving the PC stereo audio detection signal executes the audio signal control program and displays the detected PC stereo audio detection signal on the OSD screen displayed on the monitor screen. That is, the currently detected PC stereo audio signal is displayed.

As described above, the TV stereo audio signal output from the tuner 15 and the VCR stereo audio signal output from the VCR 20, such as the PC stereo audio signal output from the PC 10, .

A mono audio input signal detecting jack terminal for detecting a mono audio signal used when the PC stereo audio signal, the TV stereo audio signal, and the VCR stereo audio signal are monaural audio signals will be described with reference to the accompanying drawings. same.

4, the audio signal detection jack 60-1 includes an audio input signal detection jack terminal 60-1-5 receiving a mono audio signal, a mono audio input signal detection jack Jack terminals 60-1 to 60-4 according to whether a mono audio signal is applied or not and a plurality of resistors R5 to R7 and a capacitor C2.

The monaural audio input signal detection jack terminals 60-1-4 include a monaural audio signal sensing lead 60-1-5 receiving a monaural audio signal.

The operation according to this configuration will be described as follows.

If the audio signal output from the PC 10, the VCR 20 and the tuner 15 shown in FIG. 1 is a monaural audio signal, the output monaural audio signal is input to the monaural audio input signal detecting jack terminal 60-1 When the PC monaural audio signal is output from the PC 10, the PC monaural audio signal sensing lead 60-1 through the impedance matching resistor R7, -5). When the PC monaural audio signal is applied, the audio input signal detection jack jacks 60-1-4 turn on the second switch SW2 to output the PC audio signal. The output PC monaural audio signal is outputted to the DC voltage V _CC2 applied through the resistor R5 and outputted through the resistor R6. At this time, the capacitor C2 is used for removing noise. The microcomputer 60-2 receiving the PC mono audio detection signal, which receives the PC mono audio detection signal output through the resistor R6 from the microcomputer 60-2, executes the audio signal control program, The PC mono audio detection signal is displayed on the OSD screen displayed on the monitor screen. That is, the currently detected PC mono audio signal is displayed.

As described above, the TV mono audio signal output from the tuner 15 and the VCR monaural audio signal output from the VCR 20 as the PC audio signal output from the PC 10 are also output to the OSD screen through the same process as the PC monaural audio signal .

An embodiment of the audio selection means 60 as described above will be described with reference to the accompanying drawings.

A VCR audio signal input terminal 60-1-1 receiving a VCR audio signal output from the VCR 20 (shown in FIG. 1) and a TV broadcast tuner 15 (shown in FIG. 2) A TV audio signal input terminal 60-1-2 receiving a TV audio signal to be output and a PC audio signal input terminal 60-1-3 receiving a PC audio signal output from the PC 10 A game machine audio signal input terminal 60-1-4 receiving a game machine audio signal output from a game machine (not shown), a VCR audio signal output from the VCR audio signal input terminal 60-1-1 A TV audio signal output from the TV audio signal input terminal 60-1-2, a PC audio signal output from the PC audio signal input terminal 60-1-3, and a game audio signal input terminal 60-1-4, And a PC audio signal output from the game machine audio signal input terminal 60-1 4), a detection section (60-1-5) for detecting a game machine audio signal outputted from the detection section (60-1-5), and an audio selection signal A microcomputer 60-2 having an audio signal control program for controlling the microcomputer 60-2, a switching circuit 60-3 for receiving an audio selection signal outputted from the microcomputer 60-2 and switching the audio signal, An audio preamplifier 65 for receiving an audio signal output from the circuit 60-3 and amplifying the received audio signal to a predetermined level, and an audio preamplifier 65 for amplifying the audio signal up to a predetermined level from the audio preamplifier 65, An audio main amplifier 70 and a speaker 75 for receiving an audio signal output from the audio main amplifier 70 and outputting an audio signal.

Hereinafter, the operation will be described in detail.

The VCR 20 reproduces the signal recorded on the video tape to output the VCR video signal and the VCR audio signal. The VCR audio signal is input to the detection unit 60-1-5 through the VCR audio signal input terminal 60-1-1 in the reproduction signal output from the VCR 20. [ The TV audio signal also receives a frequency of a certain frequency band from the TV receiving antenna 15-1 (shown in FIG. 2) and amplifies and separates the audio signal through a tuner 15 (shown in FIG. 2) do. The TV audio signal output through the tuner 15 is input to the detection unit 60-1-5 through the TV audio signal input terminal 60-1-2. The PC 10 on which the program having the audio effect is executed outputs the PC audio signal according to the program through the PC audio signal input terminal 60-1-3. The game machine audio signal output from the game machine executing the game outputs the game machine signal as the game program is executed. The game machine audio signal output from the game machine is input to the detector 60-1-5 through the game machine audio signal input terminals 60-1-4.

The detection unit 60-5 receiving the audio signal output from the VCR 20, the TV broadcast tuner 15, the PC 10 and the game machine is connected to the VCR 20, the tuner 15, the PC 10, The audio signal output from the game machine is detected. If the detection unit 60-1-5 detects an audio signal, the detected audio signal is applied to the microcomputer 60-2. The microcomputer 60-2, which has received the audio signal from the detection unit 60-1-5, executes an audio signal control program for controlling the audio signal and outputs an audio selection signal corresponding to the detected audio signal to the switching circuit 60-3. . The switching circuit 60-3 receiving the audio selection signal output from the microcomputer 60-2 selects the detected audio signal. That is, for example, when the detecting unit 60-1-5 detects the VCR audio signal, the microcomputer 60-2 applies the VCR audio selecting signal according to the VCR audio signal to the switching circuit 60-3 . The switching circuit 60-3 receiving the VCR audio selection signal according to the selection of the VCR audio signal output from the microcomputer 60-2 selects and outputs the applied VCR audio signal. In addition, a TV audio signal, a PC audio signal, and a game machine audio signal are detected in the same manner as the VCR audio signal, and are selected and output in the switching circuit 60-3.

Thus, the audio signal selected through the switching circuit 60-3 is amplified to a predetermined level through the audio pre-amplifier 65 and output. The audio signal output through the audio pre-amplifier 65 is finally amplified through the audio main amplifier 70, and the audio signal is outputted through the speaker 75. [

Another embodiment of the switching circuit for switching the audio signal will be described with reference to the accompanying drawings.

A microcomputer 60-2 having an audio signal control program for controlling an audio signal as shown in FIG. 6A, and a microcomputer 60-2 for receiving a logic signal according to an audio selection signal outputted from the microcomputer 60-2, And a switching circuit 60-3 for selecting and outputting an audio signal.

The switching circuit 60-3 includes a switching IC 60-3-1 for receiving a logic signal in accordance with the audio selection signal output from the microcomputer 60-2 and outputting an audio signal in accordance with the applied logic signal, And a plurality of resistors R1 to R8.

The operation of this configuration will be described in more detail as follows.

The audio signal selected by the user is detected by the microcomputer 60-2. The microcomputer 60-2, which senses the audio signal, outputs a logic signal according to the audio selection signal. The logic signal output from the microcomputer 60-2 is received by the switching IC 60-3-1 in the switching circuit 60-3. The switching IC 60-3-1 receiving the logic signal output from the microcomputer 60-2 outputs an audio signal according to the logic signal. For example, when the selection signal of the VCR audio signal is applied to the microcomputer 60-2, the microcomputer 60-2 outputs the logic signal in accordance with the selection signal of the VCR audio signal. That is, the microcomputer 60-2 outputs the logic signal (0,0) of 2 bits.

Therefore, the switching IC 110-22 receives the logic signal (0,0) output from the microcomputer 60-2 as the low level signal (0,0) to the terminal "A" and the terminal "B". The switching IC 60-3-1 which has received the low level signal (0,0) to the terminal "A" and the terminal "B" is connected between the resistors R1 and R8 and the terminals "L-1" "Receives an L-VCR audio signal and an R-VCR audio signal through an input terminal formed in parallel. L-0 "and" R-0 "of the switching IC 60-3-1 to which the L-VCR audio signal and the R-VCR audio signal are applied. L-VCR audio signal is output from the output terminal "L-0" of the switching IC 60-3-1 through the output terminal " L- The L-VCR audio signal is output through the output terminal "R-0", and the R-VCR audio signal is output through the output terminal "R-0".

The L-VCR audio signal and the R-VCR audio signal output from the output terminals "L-0" and "R-0" of the switching IC 60-3-1 are supplied to the audio pre- And is amplified through the amplifier 70. The L-VCR audio signal and the R-VCR audio signal amplified through the audio pre-amplifier 65 and the audio main amplifier 70 are outputted through the speaker 75 to the final VCR audio signal.

Accordingly, the TV audio signal, the PC audio signal, and the game machine audio signal selected by the user in view of the VCR audio signal and the OSD screen displayed on the monitor screen are configured in parallel with the resistors R2, R3, R4, R6, R7, Is input to the switching IC 60-3-1 through the input terminals L-2, L-3, L-4, R-2, R-3 and R-4. The TV audio signal, the PC audio signal, and the game machine audio signal applied to the switching IC 60-3-1 are switched between the TV audio signal, the PC audio signal, and the game machine audio signal in accordance with the logic signal output from the microcomputer 60-2 L-0 "and" R-0 "of the IC 60-3-1 and amplified through the audio pre-amplifier 65 and the audio main amplifier 70. [ The audio signal amplified through the audio pre-amplifier 65 and the audio main amplifier 70 is finally output through the speaker 75. [

The audio signal output from the switching IC 60-3-1 according to the logic signal output from the microcomputer 60-2 will be described with reference to a truth table.

As shown in FIG. 6B, an audio signal outputted from the switching IC 60-3-1 in accordance with an applied logic signal and a logic signal output from the microcomputer 60-2. Since the logic signal output from the microcomputer 60-2 is connected to the 2-bit signal line, the number of cases where the audio signal can be selected is four. Therefore, if the low level signal (0, 0) is input to the input terminals "A" and "B" of the switching IC 60-3-1 respectively, the switching IC 60-22 selects the VCR audio signal and outputs . When the low level signal 0 and the high level signal 1 are inputted to the input terminals "A" and "B" of the switching IC 60-22, respectively, Signal is selected and output. When the high level signal 1 and the low level signal 0 are input to the input terminals "A" and "B" of the switching IC 60-3-1, respectively, the switching IC 60-3-1 When a high level signal (1,1) is inputted to the input terminals "A" and "B" of the switching IC 60-3-1, respectively, the switching IC 60-3-1 Selects and outputs the game machine audio signal. Thus, the audio signal selected through the switching IC 60-3-1 is amplified through the audio pre-amplifier 65 and the audio main amplifier 70, and the amplified audio signal is output through the speaker 75. [

Another embodiment of the switching circuit 60-3 will be described with reference to the accompanying drawings.

A microcomputer 60-2 incorporating an audio signal control program for controlling an audio signal as shown in FIG. 7; and a microcomputer 60-2 receiving an audio control signal according to an audio selection signal output from the microcomputer 60-2, And a switch unit 60-3-2 in the switching circuit 60-3 for selecting and outputting an audio signal in accordance with the audio signal.

In the above configuration, the switch unit 60-3-2 receives the audio control signal according to the audio selection signal output from the microcomputer 60-2, switches according to the applied audio control signal, A second switch SW2 for switching the output of the PC audio signal on / off according to an audio control signal received in response to the audio selection signal output from the microcomputer 60-2; And a third switch SW3 for turning on / off the output of the game machine audio signal in response to the audio control signal received in response to the audio selection signal output from the microcomputer 60-2, 4 switch SW4.

An operation having such a configuration will now be described.

And the audio signal according to the user's selection is detected by the microcomputer 60-2. The microcomputer 60-2, which senses the audio signal, outputs an audio control signal according to the audio selection signal. The microcomputer 60-2, which senses an audio signal, outputs an audio control signal corresponding to the detected audio signal. The audio control signal output from the microcomputer 60-2 is received by the switch unit 60-3-2. The switch unit 60-3-2 receiving the audio control signal according to the audio selection signal selects and outputs the TV, VCR, PC, and game audio signals according to the audio control signal.

For example, when the user selects a TV audio signal, the microcomputer 60-2 detects a TV audio signal corresponding to the selected TV audio signal. The microcomputer 60-2, which senses the TV audio signal, applies the TV audio control signal to the first switch SW1 of the switch unit 60-3-2 according to the key operation signal. The first switch SW1 receiving the TV audio control signal output from the microcomputer 60-2 is turned on in the normally open state. When the first switch SW1 is turned on, the switch unit 60-3-2 outputs the TV audio signal. The TV audio signal output through the switch unit 60-3-2 is amplified through the audio preamplifier 65 and the audio main amplifier 70 and the TV audio signal is outputted through the speaker 75. [ The VCR audio control signal, the PC audio control signal, the game machine audio control signal and the like outputted from the microcomputer 60-2 as the TV audio signal are also supplied to the second switch SW2, the third switch SW3, the fourth switch SW4 And is output from the switch unit 60-3-2. A VCR audio signal, a PC audio signal, a game machine audio signal, and the like output through the second switch SW2, the third switch SW3, and the fourth switch SW4 are supplied to the audio preamplifier 65 and the audio main amplifier 70, And a VCR audio signal, a PC audio signal, a game machine audio signal, and the like are output through the speaker 75.

A method for selecting such an audio signal will be described with reference to the accompanying drawings.

As shown in FIG. 8, a method for selecting an audio signal includes an audio selection starting step S60-1 for selecting an audio signal, and an audio selection starting step S60-1 for selecting an audio signal An audio signal input state detection step (S60-2) of detecting an input state, and a TV audio signal determination step (S60-2) of determining whether the audio signal sensed by the audio signal input state detection step (S60-2) A signal judging step S60-3 of judging whether or not an audio signal other than the TV is inputted if the audio signal judged in the TV audio signal judging step S60-3 is not a TV audio signal, (S60-4); judging whether the audio signal judged in the TV audio signal judging step (S60-3) and the audio signal judging step (S60-4) other than the TV is an audio signal other than the TV audio signal; An audio signal input for judging whether each of the judged audio signals is input, whether each of the judged audio signals is inputted and whether a jack to which each audio signal is inputted is connected, and a Jack In If the audio signal is input or the jack is not connected in the audio signal input and jack in step S60-5, An audio signal and a Jack In 0 SD display step S60-7 for requesting a Jack connection and a step S60-7 for confirming whether the audio signal input and the jack are connected for a predetermined time, The audio signal is not output unless the audio signal input and the jack are connected for a predetermined time in step S60-7 for checking whether the audio signal input and the jack are connected for a predetermined period of time Not audio The audio signal mute step S60-8 for performing a signal mute and the step S60-7 for checking whether the audio signal input and the jack are connected for a predetermined period of time, When an audio signal input and a jack are connected and an audio signal is inputted in the audio signal input and jack in step S60-5 or a jack is not connected, A step S60-9 of executing a signal and a step S60-10 of inputting a Jack In status confirmation key signal while the audio signal is being executed in the audio mutual execution step S60-9, A step S60-11 of displaying a Jack In data OSD for displaying Jack In data on the OSD screen and a key signal input determining step S60-11 for checking the Jack In state, -10), if the key signal is not inputted, the end of the audio signal termination It consists of a tab (S60-12).

Operation according to this configuration will be described as follows.

The audio signal is selected through the audio selection step S60-1. When the audio signal is selected, the audio signal input state detection step S60-2 detects the audio signal input state according to the audio signal selection. If the audio signal is detected in the audio signal input state detection step S60-2, it is determined whether the detected audio signal is a TV audio signal in the TV audio signal determination step S60-3. If the TV audio signal judging step S60-3 is not the TV audio signal, it is judged in the audio signal judging step S60-4 other than the TV whether or not the audio signal other than the TV is inputted. That is, whether it is a VCR audio signal or a PC audio signal. If it is determined in step S60-4 that the audio signal other than the TV is determined to be an audio signal other than the TV, whether or not an audio signal other than the TV is inputted and a jack Jack It is checked at step S60-5 whether or not an audio signal is inputted and an audio signal for judging whether a jack is connected or not and a jack in step S60-5.

If the audio signal and the audio signal other than the TV audio signal and the TV signal are not applied in the step S60-5, the audio signal and the jack-in OSD display step S60-6, . In the audio signal and Jack In OSD display step S60-6, a request message for inputting an audio signal and a message for connecting a jack to a monitor are displayed. For example, a message "Audio signal input and Jack In" is displayed on the OSD screen displayed on the monitor screen to display information for the user to connect the audio signal and the jack.

The audio signal and the jack signal Jack are displayed for a certain period of time in which the message "Audio signal input and Jack In" displayed on the OSD screen in the audio signal and Jack In OSD display step S60-6 is displayed. In is connected. That is, if an audio signal or jack is not connected to the monitor for a certain period of time during which the message "Audio signal and Jack In" displayed on the OSD screen is displayed, the audio signal mute step S60- 8) is executed and the audio signal is not outputted. On the other hand, when an audio signal or jack is connected to the monitor for a predetermined time period in which a message "Audio signal input and Jack In" displayed on the OSD screen is displayed, (S60-9) is executed. When the audio executing step S60-9 is executed in this manner, the TV audio signal and the audio signals other than the TV, that is, the PC audio signal and the VCR audio signal are outputted.

In addition, during the output of the TV audio signal and the audio signal other than the TV, the user confirms through the key signal input step S60-10 that a jack for an audio signal is connected at present. That is, during the execution of the audio executing step S60-9 for outputting the audio signal, it is possible to confirm through the key signal input step S60-10 which audio jack jack is connected through the OSD screen. The key signal input step S60-10 detects a key signal for confirming a Jack In state output from a key operation unit (not shown) as a monitor control means. If a key signal for confirming the Jack In state is detected, a Jack In data OSD display step (S60-11) for displaying Jack In data is executed and the OSD screen displays the current Jack In "status. In other words, it confirms which jack of the audio signal is currently connected. Accordingly, when the current Jack In data is confirmed, the user can see the OSD screen and select the current Jack In data to listen to the desired audio signal. On the contrary, if the key signal for confirming the Jack In state is not sensed, the audio signal selection is ended through the end step S60-12.

As described above, the present invention provides a technique for selecting a TV audio signal, a video audio signal, and a PC audio signal in a monitor having functions such as TV reception and video, The effect of reducing the burden on the body.

Claims (9)

In a circuit for switching a PC / TV / VCR audio signal in a monitor, an audio selection signal for selecting an audio signal by detecting an audio signal, OSD data according to a color gain control signal and an audio signal is generated and output An OSD unit receiving the OSD data according to the audio signal and outputting an OSD gain signal, and an OSD unit receiving the video signal output from the PC and receiving the color gain control signal, A video main amplifier for receiving and amplifying the video signal and the OSD gain signal, a CRT for receiving and displaying the video signal and the OSD signal, An audio pre-amplifier for amplifying the selected audio signal at a constant level according to the selection signal, Applying the received audio signal and the main audio amplifier to the final amplification, PC / TV / VCR audio signal conversion circuit characterized by consisting of a speaker for outputting the audio signal outputted from the main audio amplifier. 2. The apparatus of claim 1, wherein the audio signal selection means comprises: a detection jack for detecting an input of an audio signal; an OSD data and color gain control signal according to an audio selection signal and an audio signal according to the detected audio signal; And outputting the audio signal to the PC / TV / VCR audio signal switching circuit. The audio input signal detecting jack according to claim 2, wherein the audio input signal detecting jack comprises: an audio input signal detecting jack terminal for receiving a stereo audio signal; an audio input signal detecting jack terminal for receiving a mono audio signal; Wherein the video signal is supplied to the PC / TV / VCR audio signal switching circuit. A VCR audio signal input terminal for receiving and outputting a VCR audio signal output from the VCR, and a TV audio signal receiving and outputting a TV audio signal output from the TV broadcast tuner, A PC audio signal input terminal for receiving and outputting a PC audio signal output from the PC, a game machine audio signal input terminal for receiving and outputting a game machine audio signal output from the game machine, a VCR audio signal, a TV audio signal, A microcomputer for receiving the detected audio signal and outputting an audio selection signal; and a control unit for switching the audio signal according to the audio selection signal received by receiving the audio selection signal and receiving the audio selection signal A switching circuit for receiving the audio signal An audio preamplifier for amplifying the audio signal up to a predetermined level, an audio main amplifier for receiving and amplifying an audio signal amplified and output to the predetermined level, and a speaker for receiving the audio signal and outputting an audio signal. / TV / VCR audio signal switching circuit. 5. The system of claim 4, wherein the switching circuit is a switching IC that receives a logic signal output from the microcomputer and selects and outputs an audio signal according to an applied logic signal. Circuit. 5. The audio / video switching method according to claim 4, wherein the switching circuit is a switch unit which receives an audio control signal output from the microcomputer and outputs an audio signal selected according to an audio control signal applied thereto. Circuit. 7. The apparatus of claim 6, wherein the switch unit comprises: a first switch for receiving an audio control signal according to an audio selection signal output from the microcomputer and switching on / off the output of the TV audio signal according to an applied audio control signal; A second switch for receiving an audio control signal according to an audio selection signal output from the microcomputer and for switching an output of the VCR audio signal on / off according to an applied audio control signal; A third switch for receiving and outputting an audio control signal and switching an output of the PC audio signal according to an applied audio control signal; a third switch for receiving and outputting an audio control signal according to an audio selection signal output from the microcomputer, Signal to switch the output of the game machine audio signal On / off according to the features of the fourth switch configured as PC / TV / VCR audio conversion circuit. A method of switching a PC / TV / VCR audio signal in a monitor, the method comprising: an audio signal input state sensing step of sensing an audio signal input state detecting a state in which a selected audio signal is input when an audio signal is selected; A TV audio signal judgment step of judging whether the detected audio signal is a TV audio signal if the detected audio signal is not a TV audio signal, And a determination step of determining whether or not the audio signal determined in the step and the audio signal determination step other than the TV is an audio signal other than the TV audio signal and the TV, Is connected to a jack (Jack) to which each audio signal is supplied An audio signal indicating an audio signal input and a Jack In confirmation step and an audio signal indicating an audio signal input and a jack connection request on the OSD screen when an audio signal is input or a jack is not connected in the step, A step of displaying a Jack In OSD display step and a step of checking whether the audio signal input and the jack are connected for a predetermined period of time while displaying an audio signal input and a jack connection request in the above step, An audio signal mute step for performing an audio signal mute in which no audio signal is output unless an audio signal input and a jack are connected for a predetermined time in the step; An audio signal input and a jack are connected and an audio signal is input or a jack is connected in the audio signal input and jack in confirmation step And an audio signal execution step for executing an audio signal if the audio signal is a video signal. The audio signal processing method according to claim 8, wherein the audio signal execution step comprises: a jack in determining whether a Jack In key signal for checking a Jack In state is inputted while an audio signal is being executed; A method of switching a PC / TV / VCR audio signal, comprising: a status check key signal input determination step; and a Jack In data OSD display step for displaying the Jack In data.