KR100288597B1 - How to control audio mode on your TV - Google Patents

Abstract

The present invention measures the stereo separation of an audio signal received when watching a stereo broadcast, and outputs a predetermined OSD screen when it is below a predetermined reference intensity so that the user can selectively select the audio mode or the user's history of using the audio mode. The present invention relates to a method of controlling an audio mode in a television that enables switching control of an audio mode to mono or stereo by referring to an audio mode detected by detecting an audio mode of a broadcast signal received on a current channel when a channel is switched. Stereo mode detects stereo separation from the audio signal separated from the broadcast signal, and if the detected stereo separation is above the standard sensitivity, the audio signal is processed as stereo and output. In correspondence with time zone If there is an audio mode selected by a user with reference to the history data selected by the user when the stereo signal is not received, the audio signal is processed and output by the selected audio mode, and when there is no audio mode selected by the reference data by the reference data, Displaying a poor reception state of the stereo signal on a predetermined OSD character screen, switching to the audio mode selected by the user, and accumulating the number of selection by channel, day, and time zone, and storing it in the historical data, thereby selecting the user's audio mode. It can provide convenience.

Description

Audio mode controlling method in a television

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of controlling an audio mode in a television. In particular, when a stereo broadcast is watched on a television, a stereo separation degree of an audio signal received is measured to output a predetermined OSD screen when the user is below a preset reference intensity. The present invention relates to a method of controlling an audio mode in a television, in which an audio mode can be selectively controlled in mono or stereo by selecting an audio mode or referring to a user's audio mode usage history.

In general, a television station uses three radio waves of different frequencies for multicasting. In the case of voice multicasting, there are cases of stereo broadcasting and two voice multicasting, such as FM stereo fire. In the case of stereo broadcasting, a signal (L + R = mono), which is a combination of left (L) and right (R) signals, is frequency-modulated and transmitted to a first voice carrier, and a left / right difference signal (LR) is transmitted to a second voice carrier. ) And the automatic identification signal (Identification Signal) is transmitted by frequency modulation.

On the other hand, the auto recognition signal is a 50% amplitude modulation of 55.07 KHz subcarrier at 149.9 Hz for stereo broadcasting, and a 50% amplitude modulation of 55.07 KHz subcarrier at 276.0 Hz for bilingual broadcasting. In order to distinguish between stereo and bilingual broadcasting, it is included every vertical blanking period.

On the other hand, in the conventional television, if the audio mode of the received broadcast signal is detected by using the above-described auto recognition signal from the received broadcast signal and the audio mode of the received broadcast signal is the stereo mode, the audio mode of the received broadcast signal is automatically switched. Is in mono mode, it automatically switches to mono mode so that the user can listen conveniently. Also, the stereo audio signal is set to forced mono mode for all channels (program number in case of European type). Even when receiving, the system automatically switches to mono mode to process a mono audio.

On the other hand, in such a conventional television, the user can reset the audio mode based on the key operation, and when the reception sensitivity decreases during the stereo mode, the user can forcibly switch to the mono mode by the key operation to increase the audio sensitivity to listen. If the user switches channels, it switches back to automatic audio mode.

However, the above-described conventional audio mode control method automatically detects that the audio signal is stereo when receiving the stereo broadcast signal by the automatic audio mode and automatically sets to the stereo mode. In this case, when the received signal is not good, the user hears By recognizing such a poor reception sensitivity by using and forcibly switching the audio mode to the mono mode with a predetermined key operation, it was possible to listen to better audio.

Therefore, when the user does not accurately recognize the limit of poor reception sensitivity and continues to listen to the audio poor reception condition occurs, when the user recognizes it, it is inconvenient to increase the reception sensitivity by switching to forced mono mode one by one In particular, there is an inconvenience in that the user must control the audio mode every time the channel is switched.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an object thereof is in parallel with an automatic audio mode for automatically detecting and switching the audio mode of a broadcast signal received from a television. If the stereo mode but the reception sensitivity is weak, it is displayed in a predetermined OSD (on screen display) character screen to give the user a choice of audio mode, and control switching to stereo or mono mode in response to the user's selection, When the stereo mode is poor for each channel, the audio mode selected by the user and the number of selections are recorded. If the number of selections is equal to or greater than a predetermined number of times, the stereo mode is automatically switched to the corresponding selection mode when the stereo mode is not received. To increase user convenience. It provides a method of controlling an audio mode of a television.

1 is a block diagram of a television employed in accordance with the present invention.

2 is a flowchart illustrating an audio mode control process in a television according to an embodiment of the present invention.

<Explanation of symbols for main parts of drawing>

10: key input unit 20: microcomputer

30: tuner unit 40: video signal processing unit

50: OSD 60: Monitor

70: audio signal processor 80: stereo separation detector

90: speaker

The method of controlling an audio mode of a television according to the present invention is a method of controlling an audio mode in a television, the method comprising: detecting an audio mode of a broadcast signal received on a current channel when a channel is switched; and if the detected audio mode is a stereo mode, Detecting stereo separation from the audio signal separated from the broadcast signal; processing and outputting the audio signal as stereo if the detected stereo separation is above the reference sensitivity; and outputting the audio signal as stereo if the detected stereo separation is below the reference sensitivity. And processing the audio signal in the selected audio mode and outputting the audio signal in the selected audio mode when there is an audio mode selected by the user with reference to the history data selected by the user when the stereo signal is not received corresponding to the time zone. Selected more than times If there is no audio mode, displaying a poor reception state of the stereo signal on a predetermined OSD text screen and waiting for the user's selection; switching to the audio mode selected by the user and accumulating the number of selections by channel, day, and time zone; And including the data and storing the data.

The above objects and various advantages of the present invention will become more apparent from the preferred embodiments of the invention described below with reference to the accompanying drawings by those skilled in the art.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram of a typical typical television, which includes a key input unit 10, a microcomputer 20, a tuner unit 30, an image signal processing unit 40, an OSD unit 50, a monitor 60, and an audio signal. The processor 70 includes a stereo separation detector 80 and a speaker 90.

In such a configuration, the key input unit 10 is provided as an input means for performing the operation of the television, and includes a plurality of keys including a mono switch key and the like, and outputs a key signal corresponding to the user's key operation. For the convenience of the user, the above-mentioned key signal is transmitted on an infrared carrier using a remote controller capable of remote input.

The microcomputer 20 controls the overall operation of the television, outputs a tuning signal (PLL data) for tuning the channel, a text control signal for displaying text information on the screen, and the audio signal processor 70. If the audio mode of the broadcast signal received by the audio mode detection signal is determined to be the stereo mode, the OSD unit 50 is turned off when the stereo separation degree detected and applied from the stereo separation degree detection unit 80 is smaller than the preset reference sensitivity. Control to display a predetermined OSD character screen indicating poor reception of stereo audio to recognize the user, and process the audio signal in the selected audio mode based on the mono switching and stereo switching key signals from the key input unit 10. Control the audio signal processing unit 70 and show the selected audio mode and the number of selections If the number of selections selected by the user with reference to the history data stored in the abbreviated memory and recorded in the case of poor reception of stereo audio is greater than or equal to the predetermined reference number, the number of times selected by the user is controlled by controlling the audio signal processor 70. Automatic switching control to the audio mode more than the number of times.

Also, the tuner unit 30 outputs a broadcast signal received by tuning to a channel corresponding to the tuning signal from the microcomputer 20.

On the other hand, the video signal processor 40 separates the audio signal and the video signal from the broadcast signal applied from the tuner unit 30 and outputs the separated audio signal, and the separated video signal is processed and output as a displayable signal.

In addition, the OSD (on screen display) unit 50 responds to the image signal applied from the image signal processing unit 40 or the character control signal from the microcomputer 20 to a blue-back screen (blue background screen). A character signal (font) to be synthesized is output to the monitor 60.

In addition, the audio signal processor 70 processes and outputs an audio signal separated from the image signal processor 40 as an outputable signal, and automatically recognizes whether it is a stereo broadcast or a bilingual broadcast on the receiving side. Extracts the signal to automatically determine the audio mode of the audio signal, applies a predetermined audio mode detection signal to the microcomputer 20, processes the audio signal applied based on the detected audio mode, and controls the microcomputer 20 for control. Based on the stereo mode or mono mode and dual mode (two languages) are processed and output to the speaker (90).

Meanwhile, the stereo separation detector 80 detects the separation of the stereo signal, that is, the reception sensitivity, from the audio signal from the audio signal processor 70 and applies it to the microcomputer 20.

Next, the audio mode control procedure in the television having the above-described configuration will be described in detail with reference to the flowchart of FIG.

First, the microcomputer 20 determines whether the TV power is turned on or the channel is switched based on a predetermined key signal for channel up / down from the key input unit 10 (step 200).

At this time, when the channel is switched, the audio mode of the broadcast signal received from the tuner 30 is determined based on the audio mode detection signal applied from the audio signal processor 70 (step 202).

In detail, the audio signal processor 70 detects an automatic recognition signal indicating an audio mode from the audio signal separated from the image signal processor 40 and applies the detected signal to the microcomputer 20 and applies it in response to the detected audio mode. The audio signal is processed and output.

Next, the microcomputer 20 determines whether the detected audio mode is the stereo mode (step 204). If the detected audio mode is the mono mode, the audio signal processor 70 processes the audio signal in the mono mode. (Step 206).

In contrast, if the detected audio mode is the stereo mode, stereo separation is detected in the audio signal separated from the received broadcast signal (step 208).

In detail, the stereo separation detector 80 detects the stereo separation from the audio signal applied from the audio signal processor 70, and applies the detected stereo separation to the A / D port of the microcomputer 20 to display the microcomputer ( 20) recognizes the stereo reception sensitivity of the audio signal of the received broadcast signal through the stereo separation applied to the A / D port.

Next, the microcomputer 20 determines whether the detected stereo separation is smaller than a preset and stored reference sensitivity (step 210).

At this time, if the detected stereo separation degree is equal to or greater than the reference sensitivity, the audio signal processor 70 is controlled to process the audio signal in stereo and output (step 212).

On the other hand, if the detected stereo separation is less than the reference sensitivity, the microcomputer 20 refers to the historical data stored in the memory (not shown) (step 214).

At this time, the history data is data stored by recording the audio mode selected by the user and the number of times of selection when the stereo reception sensitivity is poor.

Accordingly, the microcomputer 20 determines whether the audio mode in which the user's selection count is greater than or equal to the preset reference count in the current data is in the current channel, the day of the week, and the time zone (step 216).

At this time, if there is an audio mode in which the number of selections of the user is greater than or equal to the reference number among the stored history data, the audio signal processing unit 70 is controlled to automatically switch to the corresponding audio mode (step 218).

On the contrary, if there is an audio mode in which the number of selections of the user is greater than or equal to the reference number among the stored history data, the OSD unit 50 is controlled to display a poor stereo reception state on the OSD text screen and wait for user selection (step 220). .

At this time, when the user selects the audio mode by performing a predetermined key operation provided in the key input unit 10, the microcomputer 20 determines the user's audio mode selection based on the key signal from the key input unit 10. (Step 222) If the selected audio mode is a stereo mode, the audio signal processor 70 is controlled to process an applied audio signal in a stereo mode (step 224). In contrast, if the selected audio mode is a mono mode, the audio signal processor 70 Control to process the applied audio signal in mono mode (step 226).

Next, after the above-described steps 224 and 226, the number of selections are accumulated and stored in the above-described history data corresponding to the current channel, the day of the week, and the time zone (step 228).

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

As described above, according to the present invention, when the audio mode of the received broadcast signal is a stereo mode in parallel with the automatic audio mode for automatically detecting and switching the audio mode of the received broadcast signal, the stereo of the audio signal is received. Detect the separation and display the OSD character screen when the detected stereo separation is below the standard sensitivity to recognize that the stereo reception sensitivity is poor, and process the audio signal in the audio mode selected by the user. By saving the mode by channel, day of week, and time zone, and automatically changing to the audio mode frequently selected by the user by using the history data when stereo sensitivity is poor, it is possible to provide the user with the convenience of audio mode selection. It works.

Claims (1)

As a method of controlling the audio mode on a television, Detecting an audio mode of a broadcast signal received on a current channel when the channel is switched; If the detected audio mode is a stereo mode, detecting stereo separation from an audio signal separated from the broadcast signal; If the detected stereo separation is equal to or greater than the reference sensitivity, processing the audio signal in stereo and outputting the stereo signal; If the detected stereo separation is less than the reference sensitivity, when there is a failure in receiving the stereo signal corresponding to the current channel, the day of the week, and the time zone, the audio signal is processed in the selected audio mode if there is an audio mode selected over a predetermined number of times. Outputting; If there is no audio mode selected more than a predetermined number of times with reference to the history data, displaying a bad reception state of a stereo signal on a predetermined OSD text screen and waiting for a user's selection; Switching to an audio mode selected by a user, and accumulating the number of selections for each channel, day of the week, and time zone, and storing the selected number in the history data.