KR19990031457A - How to switch between stereo and mono mode - Google Patents

Abstract

The present invention relates to a stereo / mono mode switching method, and an apparatus and method for allowing a consumer to freely select a forced or automatic switching method by using an automatic switching function of a stereo / mono mode and a forced switching function using an OSD function. It is about. In the conventional mode switching method, since only one method of automatic switching or forced switching is employed, the activeness that can be selected by the consumer is excluded, and when the automatic switching method is fixed, a large amount of noise is inserted into a voice signal or a malfunction occurs. There is a significant problem with watching. In the present invention, when forced or automatic switching of the stereo / mono mode is selected, switching according to each case is performed. That is, when forced switching is selected, an OSD screen is displayed allowing the microcomputer to select stereo or mono based on the stereo or mono data signal received from the voice demodulation IC so that either one can be selected and the automatic switching is selected. In this case, the method of switching the stereo / mono mode is proposed so that the mode switching is automatically executed by applying the mode switching data to the voice demodulation IC.

Description

How to switch between stereo and mono mode

The present invention relates to a stereo / mono mode switching method for a television, which allows a consumer to freely select a forced or automatic switching method by using an automatic switching function of a stereo / mono mode and a forced switching function using an OSD function. It is about a method.

In general, a television receives a broadcast signal transmitted from each broadcasting station through an antenna and displays the received signal at an antenna. The broadcasting station's image is converted into a video signal and a voice is converted into an audio signal. It is carried along with the signal. The high frequency signal transmitted through the transmitting antenna is received through a receiving antenna installed in each home and applied to the television. The high frequency signal received by the television is divided into a video signal and an audio signal, and the video signal is displayed on the receiving tube after the video signal processing step. On the other hand, the reference signal for determining whether the voice signal is a stereo mode signal or a mono mode signal is a pilot signal (PILOT SIGNAL), if the pilot signal is included in the voice signal is determined to be a stereo mode through a speaker On the other hand, if the pilot signal is not included in the voice signal, it is determined as a mono mode and output as a voice signal.

The conventional technology employing the switching function for the stereo mode or the mono mode output as described above has a problem in that the consumer can select the activeness because only one method of automatic switching or forced switching is employed. For example, when the input signal is a weak signal or a no signal when the automatic switching method is fixed, a lot of noise is inserted into a voice signal or a lot of malfunction occurs.

The present invention was invented to solve the above problems, and an object of the present invention is to allow a consumer to directly select whether to automatically switch between stereo / mono mode or to force the noise generated during automatic switching. B It is to provide a switching method of the stereo / mono mode to prevent the malfunction.

1 is a block diagram for explaining a stereo / mono mode switching method of the present invention.

2 is a flowchart illustrating a method of switching a stereo / mono mode according to the present invention.

<Description of Symbols for Main Parts of Drawings>

100: antenna 150: tuner circuit

200: IF amplifier 250: image detector

300: image processing unit 350: CRT driving unit

400: CRT 450: voice detector

500: voice processing unit 550: voice demodulation IC

600: audio amplifier 650: speaker

700: OSD driver 750: Y pyrom

800: microcomputer 850: remote controller

Hereinafter, with reference to the accompanying drawings will be described a specific embodiment for achieving the above object of the present invention.

1 is a block diagram illustrating a stereo / mono switching method of the present invention.

Referring to FIG. 1, the present invention performs a high frequency amplification on an image signal of a channel selected for display on a screen among high frequency signals received through an antenna 100, and mixes with an oscillation frequency oscillated by channel selection. A tuner circuit unit 150 for converting to an intermediate frequency for easy amplification and then amplifying to generate a composite video signal, an IF amplifier unit 200 for intermediately amplifying the composite video signal applied from the tuner circuit unit 150; The image detector 250 extracts an image signal from the composite image signal applied by the intermediate frequency amplification from the IF amplifier 200 and the image signal output from the image detector 250 is displayed on the CRT 400. The image processor 30 processes and demodulates the signal to the CRT driver 350 and processes the OSD signal generated from the OSD driver 700 to be displayed on the CRT 400. 0), an audio detector 450 extracting only an audio signal from the composite video signal applied by being intermediate-frequency amplified from the IF amplifier 200, and an audio signal output through the audio detector 450. And a voice demodulation IC 550 to determine whether the voice signal output from the voice processor 500 is a stereo signal or a mono signal and to be applied to the microcomputer 800, and the voice demodulation IC 550. Amplified signal output from the audio amplifier 600 to amplify the signal output from the speaker 650, and a stereo signal or a mono signal from the voice demodulation IC (550) receives the OSD generation signal to the OSD driver 700 And a microcomputer 800 for applying mode switching data to the voice demodulation IC 550, and an EPI 750 for outputting message data in response to a read enable signal of the microcomputer 800. .

Hereinafter, an operation of an embodiment of the present invention made as described above will be described in detail with reference to the accompanying drawings.

First, the composite video signal, which is a high frequency signal received from the antenna 100, is tuned by the tuner circuit 150 and converted into an intermediate frequency that is easily amplified by the IF amplifier 200. The composite image signal applied from the IF amplifier 200 is applied to the image processor 300 only by the image detector 250, and the image processor 300 from the image detector 250. The applied image signal is demodulated and amplified so as to be suitable for display on the CRT 400 and then applied to the CRT driver 350.

In addition, the voice detector 450 connected to the IF amplifier 200 extracts only an audio signal from the composite video signal output from the IF amplifier 200 and applies it to the voice processor 500. The voice demodulation IC 550 connected to the 500 determines whether the voice signal output from the voice processor 500 is a stereo signal or a mono signal, and if the stereo signal is a stereo signal, applies the stereo data to the microcomputer 800 and the mono signal. In this case, mono data is applied to the microcomputer 800. Accordingly, the microcomputer 800 automatically switches between stereo / mono modes by applying mode switching data to the voice demodulation IC 550 based on stereo data or mono data received from the voice demodulation IC 550. You lose.

On the other hand, the microcomputer 800 is based on the stereo or mono signal data received from the voice demodulation IC (550), and applies the OSD generation signal to the OSD driver 700, the switching of the stereo and mono mode on the screen of the television This will cause the OSD screen to be displayed, allowing you to choose whether or not to force. Therefore, when forced switching is selected while the OSD screen is displayed, mutual switching of stereo / mono modes is forcibly performed.

Next, a method of switching between the stereo / mono mode according to the present invention will be described with reference to FIG. 2.

First, the power of the television is switched on in order to watch a broadcast program of the television (S10), and the channel to be watched is tuned after the power of the television is switched on (S11). Further, after the channel is tuned, it is input whether to switch between the stereo mode and the mono mode to be forced or automatic (S12), and it is determined whether the input state of the mode is forced switching (S13). When it is determined in the switching discrimination step (S13) that the forced switch is detected, the voice signal output from the voice processing unit 500 is detected (S19), and when the voice signal is not detected in the voice signal detection step (S19), the channel tuning step (S11) is repeated.

On the other hand, after the voice signal is detected in the voice signal detecting step (S19), it is determined whether or not a pilot signal is included in the detected voice signal (S20), and determining whether or not the pilot signal (S20) If there is no pilot signal in, it is confirmed as mono (S21), and if there is a pilot signal, it is confirmed in stereo (S22). That is, when it is confirmed as the mono or stereo, an OSD generation signal is applied to the OSD driver 700 so that an OSD screen for displaying stereo or mono can be selected on the screen of the television (S23), and the OSD screen is displayed. In this state, mono or stereo is selected (S24).

Therefore, the output is the selected mode in the mono or stereo selection step (S24) (S25).

In addition, when it is determined by the automatic switching instead of the forced switching in the switching judging step S13, a voice signal output from the voice processing unit 500 is detected (S14), and the voice signal is detected in the voice signal detecting step S14. If is not detected, the channel tuning step S11 is repeated. On the other hand, it is determined whether or not a pilot signal is included in the voice signal detected in the voice signal detection step (S14) (S15), and if there is no pilot signal in the pilot signal presence / absence determination step (S15), it is confirmed as mono. If the pilot signal is present (S16), it is confirmed in stereo (S17). Therefore, when it is confirmed as mono or stereo, the mono switching data is applied to the voice demodulation IC 550 and the mode is automatically switched (S18), and then output in the switched mode (S25).

As described above, in the present invention, when the consumer selects forced switching or auto switching of the stereo / mono mode, the switching according to each case is performed. That is, when forced switching is selected, an OSD screen for displaying stereo or mono can be displayed on the television screen based on the stereo or mono data signal received from the voice demodulation IC. In addition, when automatic switching is selected, mode switching is automatically performed by receiving stereo or mono data signals from the voice demodulation IC and applying mode switching data corresponding to stereo or mono to the voice demodulation IC. Therefore, the consumer can select automatic switching or forced switching by free will, and when the automatic switching method is selected, noise can be inserted into the voice or a forced switching method can be avoided when a malfunction occurs. There is.

Claims (2)

Step (S10) that the power of the television is switched on, Step S11 of selecting a channel to be watched in the power-switching step S10 of the television; Inputting whether to forcibly or automatically switch between a stereo mode and a mono mode in step S11, when the channel is tuned; Determining whether the input state of the mode is forced switching (S13) in the step (S12) of inputting whether to force or automatically switch the mode; When it is determined that the forced switching in the switching determination step (S13) of the step (S19) for detecting the voice signal output from the voice processing unit 500, Step S11 of repeating the channel selecting step if the voice signal is not detected in the voice signal detecting step S19; When there is a pilot signal in the detected voice signal in step S19 of detecting the voice signal, determining in mono (S21) and determining in stereo when the pilot signal is absent (S22); After the mono discrimination step (S21) or the stereo discrimination step (S22) is determined to be mono or stereo, an OSD generation signal is applied to the OSD driver 700 to display a stereo or mono to display on the screen of the television Is displayed (S23), (S24) selecting mono or stereo while the OSD screen is displayed; and And a step (S25) of outputting the selected mode in the step (S24) of mode selection. The voice signal output from the voice processing unit 500 is detected in case of automatic switching instead of forced switching in the switching judging step S13, and the presence or absence of a pilot signal is detected in the detected voice signal. According to the stereo or mono, respectively, after the mono switching data is applied to the voice demodulation IC (550), the switching of the stereo or mono mode is characterized in that the output is made automatically.