KR20100046395A - Method and audio signal output circiut of display device - Google Patents

Abstract

PURPOSE: An audio signal output device of a display device is provided to supply a stable voice output function by adopting an output gain value according to the voice transmission method of an inputted voice signal. CONSTITUTION: A broadcasting system decision unit(20) detects a video carrier frequency and an image carrier frequency from a received broadcasting signal of a broadcasting signal receiver(10), and a voice transmission type decision unit(30) discriminates the voice transmission method of the corresponding voice signal of a decided broadcasting system according to a decided broadcasting system. A control unit(50) changes a preset output gain value according to a decided voice transmission type. A voice signal compensation unit(60) compensates the voice signal of the inputted broadcasting signal through the outputted gain value.

Description

Audio signal output device and method in display device {Method and audio signal output circiut of display device}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display apparatus, and more particularly, to an apparatus and a method for outputting a voice signal in a display apparatus capable of stably outputting a corresponding voice signal according to an audio system of an input voice signal.

In general, a multi-TV system refers to a TV system that allows a user to receive and signal a plurality of broadcasts having different broadcast methods.

In addition, the intercarrier system refers to a method of amplifying a video signal and an audio signal with the same intermediate frequency amplifier and then separating the two signals by different detection.

Currently, the display apparatus generally used is mostly an intercarrier type, and even if the local oscillation frequency is fluctuated, the intermediate frequency of the voice is always constant, thereby preventing the distortion of the voice and the inability to hear the voice.

That is, in the conventional TV broadcasting system, the broadcasting system of the display apparatus is divided into various types such as B / G system, D / K system or I system according to the size of carrier deviation of video / audio intermediate frequency. In particular, the B / G method and the D / K method is divided as shown in Table 1 below.

SYSTEM VISION SOUND Intercarrier COUNTRY B / G 45.75 40.25 5.5 CCIR D / K 38.90 32.40 6.5 OIRT ... ... ... ... ...

The broadcast signal is detected through specific blocks of the display device due to the carrier frequency and the deviation as shown in Table 1 above.

In addition, a voice transmission method for transmitting an audio signal according to the method of the broadcast system is also various.

That is, the B / G system has a voice transmission method called A2, NICAM, and I has NICAM, D / K has A2, NICAM, M / N has A2, BTSC, and L has NICAM (AM).

According to an embodiment of the present invention, the broadcasting system is set differently for each channel, and the modulation rate is different for each voice transmission method, and when the channel is changed, output degradation and saturation occurs due to the change of the broadcasting system and the voice transmission method, and thus the user is preset. This can help you avoid the hassle of re-adjusting the volume level.

In addition, in an embodiment of the present invention, a more stable voice output function may be provided by applying an output gain value according to a voice transmission method of an input voice signal.

Technical problems to be achieved by the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

An audio signal output apparatus in a display apparatus according to an embodiment of the present invention includes a broadcast signal receiving unit for receiving a broadcast signal input from the outside; A broadcast system determining unit which detects an image carrier frequency and an audio carrier frequency from the broadcast signal received through the broadcast signal receiving unit to determine a broadcast system; A voice transmission method determination unit for determining a voice transmission method of the corresponding voice signal in response to the broadcast system determined by the broadcast system determination unit; And a controller for changing a preset output gain value according to the voice transmission method determined by the voice transmission method determination unit.

In addition, the audio signal output method in the display device according to an embodiment of the present invention comprises the steps of detecting the video carrier frequency and the voice carrier frequency of the input broadcast signal; Determining a broadcast system of an input broadcast signal by calculating a deviation between the detected video carrier frequency and audio carrier frequency; Determining a voice transmission method of the input broadcast signal based on the determined broadcast system; And outputting a voice signal of the received broadcast signal by applying an output gain value corresponding to the determined voice transmission method.

The audio signal output device and method in the display device according to the present invention can prevent the expected field claims in advance in accordance with the ever-increasing consumer viewing level, and also provide convenience to consumers by making more stable listening conditions. It has an effect.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. However, the spirit of the present invention is not limited to the embodiments presented, and other embodiments included within the scope of other inventive inventions or the scope of the present invention can be easily made by adding, changing, or deleting other elements. I can suggest.

The term used in the present invention is selected as a general term widely used as possible at present, but in certain cases there is also a term arbitrarily selected by the applicant, in which case the meaning is described in detail in the description of the invention, the name of a simple term It should be clear that the present invention is to be understood as a meaning of terms.

1 is a block diagram illustrating a configuration of a voice output apparatus in a display apparatus according to an exemplary embodiment of the present invention, FIG. 2 is a diagram illustrating a general broadcasting system and a voice transmission method, and FIG. 3 is an exemplary embodiment of the present invention. 4 is a flowchart illustrating a method of determining a voice transmission method according to an embodiment of the present invention, and FIG. 4 is a flowchart illustrating a method of outputting a voice of a voice output device in a display device according to an exemplary embodiment of the present invention.

As shown in FIG. 1, the audio output apparatus of the display apparatus according to an exemplary embodiment of the present invention receives a broadcast signal receiver 10 for receiving a broadcast signal input from the outside and through the broadcast signal receiver 10. A broadcast system determination unit 20 for detecting a video carrier frequency and an audio carrier frequency from a broadcast signal to determine a broadcast system, and a voice of a corresponding audio signal in response to the broadcast system determined by the broadcast system determination unit 20. The voice transmission method determination unit 30 determines a transmission method, an output gain value corresponding to at least one voice transmission method, and a memory unit 40 having a table, and the voice transmission method determination unit 30 The input broadcast signal by applying a control unit 50 for changing a predetermined output gain value according to a voice transmission method and the output gain value changed through the control unit 50. It is configured to include a voice signal compensation unit 60 to compensate the voice signal of.

Hereinafter, the operation of the audio output device in the display device according to an embodiment of the present invention will be described.

The broadcast receiving unit 10 receives a broadcast signal transmitted from the outside through an antenna (not shown), and receives a broadcast signal having a frequency band corresponding thereto according to a tuning control signal of the controller 50 to be described later. The received broadcast signal is signal processed and separated into a video and audio signal.

The broadcast system determination unit 20 detects a voice carrier frequency and an image carrier frequency from the broadcast signal received through the broadcast signal unit 10, calculates a deviation between the detected voice carrier frequency and the image carrier frequency, and broadcasts the corresponding broadcast. Determine your system.

That is, the broadcasting system receiving system of the display device is generally classified into various types such as B / G or D / K or I by the magnitude of the video / audio frequency carrier deviation of the intermediate frequency (IF). It is possible to automatically discriminate all broadcasting system methods including B / G system and D / K system used in Germany or Germany by intercarrier.

In other words, as shown in FIG. 2, in general, the B / G intercarrier frequency (deviation of the video carrier frequency and the voice carrier frequency) is 5.5 MHz, and the D / K intercarrier frequency (the video carrier frequency and the The deviation of the voice carrier frequency is 6.5 MHz, the intercarrier frequency of the I method (the deviation of the video carrier frequency and the voice carrier frequency) is 6.0 MHz, and the intercarrier frequency of the M / N method (the video carrier frequency and the voice carrier frequency). Deviation) is 4.5 MHz.

That is, in conclusion, the broadcasting system determination unit 20 detects and outputs an image carrier frequency and an audio carrier frequency from the received broadcast signal, and the controller 50 determines a deviation between the output video carrier frequency and the audio carrier frequency. The broadcast system of the corresponding broadcast signal is determined based on the calculation result.

The voice transmission method determination unit 30 determines the voice transmission method of the received broadcast signal based on the pilot frequency transmitted from the broadcasting station and the detected voice carrier frequency.

In other words, the voice transmission method determination unit 30 generally has a pilot frequency transmitted from a broadcasting station and determines the voice transmission method of the broadcast signal according to how far the position of the voice carrier frequency is from the corresponding pilot frequency. .

That is, as illustrated in FIG. 3, the BTSC scheme is described as an example. The pilot frequency Fh transmitted from a broadcasting station is 15.734 Khz, and how many times the audio signal of the corresponding channel exists in the reference frequency main channel is present. According to the voice transmission method is determined.

In other words, it is determined whether the audio transmission method of the corresponding channel is Mono, Stereo, Sap, or Pro according to the position of the voice carrier frequency according to the position of the audio signal. Here, Mono, Stere0, Sap, Pro means a voice multiplex method supported by BTSC.

In the memory unit 40, output gain values for outputting a predetermined output value for each voice transmission method are stored in a table.

The controller 50 extracts an output gain value corresponding to the voice transmission method of the determined broadcast signal from the memory unit 40, and controls the output signal to be output by applying the extracted output gain value.

The voice compensator 60 compensates the received voice signal by applying the output gain value set through the controller 50.

That is, in the operation of compensating the voice signal through the voice compensator 60, there are volume table values and filter values in addition to the output gain values.

Here, the volume table value refers to a table in which a voice level is set for each input mode, and the filter value is a value for correcting a specific voice difference for each speaker and a tool.

In addition, the voice compensator 60 adjusts the set output gain value to compensate for the received voice signal.

For example, when the voice transmission method of the broadcast signal is determined as SAP, the output gain value (mixer gain) is set to 0x43, and the setting code is configured as follows.

if (vLG_IsSignalState [MAIN]! = Sound_GetUserPrefSoundMode (LGF_GetFWMode (), MAIN_MSP) == NTSC_OSMI_SAP)

LGF_NTP3000_ByteWrite (NTP_REG_MIXER_GAIN_01, 0x43);

When the setting code is set as described above, the voice compensator 60 compensates for the voice signal by using a final output matrix.

As such, the audio signal output device in the display device according to the present invention can prevent the expected field claims in advance in accordance with the ever-increasing consumer viewing level, and also provide convenience to consumers by creating more stable listening conditions. have.

As shown in FIG. 4, the audio signal output method of the display apparatus according to the exemplary embodiment of the present invention configured as described above first receives a broadcast signal of a specific frequency band according to a user request among broadcast signals input from the outside ( S10).

Subsequently, an image carrier frequency and an audio carrier frequency are detected from the received broadcast signal (S20).

The deviation of the detected video carrier frequency and the voice carrier frequency is calculated to determine the broadcast system of the received broadcast signal (S30). That is, in general, the B / G intercarrier frequency (deviation of the video carrier frequency and the voice carrier frequency) is 5.5 MHz, and the D / K intercarrier frequency (deviation of the video carrier frequency and the audio carrier frequency) is 6.5 MHz. The intercarrier frequency (deviation of the video carrier frequency and the audio carrier frequency) of the I system is 6.0 MHz, and the intercarrier frequency of the M / N system (the deviation of the video carrier frequency and the audio carrier frequency) is 4.5 MHz.

Accordingly, the broadcast system of the received broadcast signal may be determined by calculating a deviation between the detected video carrier frequency and the voice carrier frequency.

Subsequently, the pilot frequency sent from the broadcasting station is checked (S40).

Then, the voice carrier frequency according to the checked pilot frequency is checked (S50).

Subsequently, a voice transmission method of the received broadcast signal is determined based on the checked voice carrier frequency (S60). That is, a voice transmission scheme of the broadcast signal is determined based on how far the position of the detected voice carrier frequency is located at a pilot frequency, which is generally transmitted from a broadcast station.

In operation S70, an output gain value corresponding to the determined voice transmission method is set.

Subsequently, the received voice signal is compensated by applying the set output gain value (S80).

In this way, the audio signal output device and method in the display device according to the present invention can prevent the expected field claims in advance in accordance with the ever-increasing viewing level of consumers, and also make the listening conditions more comfortable for the convenience of consumers. Can be provided.

1 is a block diagram showing the configuration of an audio output device in a display device according to an embodiment of the present invention.

2 is a diagram for explaining a general broadcast system and a voice transmission method.

3 is a view for explaining a voice transmission method determination method according to an embodiment of the present invention.

4 is a flowchart for explaining a voice output method of a voice output device in a display device according to an exemplary embodiment of the present disclosure.

<< Explanation of symbols for main part of drawing >>

10: broadcast signal receiver 20: broadcast system determination unit

30: voice transmission method determination unit 40: memory unit

50: control unit 60: voice signal compensation unit

Claims (7)

A broadcast signal receiver for receiving a broadcast signal input from the outside; A broadcast system determining unit which detects an image carrier frequency and an audio carrier frequency from the broadcast signal received through the broadcast signal receiving unit to determine a broadcast system; A voice transmission method determination unit for determining a voice transmission method of the corresponding voice signal in response to the broadcast system determined by the broadcast system determination unit; And, And a controller for changing a preset output gain value according to the voice transmission method determined by the voice transmission method determination unit. The method of claim 1, The broadcasting system determination unit And a broadcast system of the broadcast signal is determined by calculating a deviation between the detected video carrier frequency and the voice carrier frequency. The method of claim 1, The voice transmission method determination unit The voice signal output apparatus of the display apparatus characterized by determining the voice transmission method based on the position of the voice carrier frequency according to the pilot frequency transmitted from the outside. The method of claim 1, An audio signal output apparatus of a display apparatus, further comprising a memory unit in which output gain values according to at least one voice transmission scheme are tabled. The method of claim 4, wherein And a voice signal compensator for compensating the voice signal of the input broadcast signal by applying the output gain value changed by the controller. Detecting an image carrier frequency and an audio carrier frequency of an input broadcast signal; Determining a broadcast system of an input broadcast signal by calculating a deviation between the detected video carrier frequency and audio carrier frequency; Determining a voice transmission method of the input broadcast signal based on the determined broadcast system; And, And outputting a voice signal of the received broadcast signal by applying an output gain value corresponding to the determined voice transmission method. The method of claim 6, The determining of the voice transmission method Checking a pilot frequency transmitted from the outside; Confirming the position of the voice carrier frequency based on the identified pilot frequency; And determining the voice transmission method of the input broadcast signal based on the identified position of the voice carrier frequency.

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