KR20050057733A - Method to control automatically the demodulator data of audio ic in the television - Google Patents

Abstract

In order to provide a general-purpose audio IC that can be used in a region different from the TV broadcasting standard scheme, the broadcasting signal transmitted from a broadcasting station is tuned to intermediate frequency processing; Inputting an audio signal of the intermediate frequency processed broadcast signal into the audio IC; After comparing the reference data of the TV broadcasting standard methods pre-stored in the audio IC with the audio signal input to the audio IC, recognizing the TV broadcasting standard method used for the audio signal, and the TV recognized from the demodulator data of the pre-stored audio IC. A method of automatically adjusting demodulator data of an audio IC of a TV, including selecting and setting demodulator data of an audio IC corresponding to a broadcast standard method is provided.

Description

How to automatically control demodulator data of TV's audio IC {METHOD TO CONTROL AUTOMATICALLY THE DEMODULATOR DATA OF AUDIO IC IN THE TELEVISION}

The present invention relates to an audio IC of a television, and more particularly, to a method for automatically adjusting demodulator data of an audio IC in order to provide an audio IC that can be used universally in different TV broadcasting standards in different countries. will be.

The TV broadcast standard used worldwide varies depending on the scanning player, screens per second, modulation method, channel bandwidth, video signal bandwidth, and audio channel modulation. Commonly used TV broadcasting standards include the National Television Systems Committee (NTSC), Phase Alternate Line (PAL), and Systems Equential Couleur A Memoire (SECAM).

The NTSC adopted the FCC and the International TV System Committee, which enacted the US color TV standard, was adopted as the color TV standard method in the US in 1953, and was adopted as the standard method in Japan in June 1960. Although there were opinions about NTSC, PAL, etc. as a matter of introduction, the Radio Administration Bureau, the competent authority, adopted the NTSC method in consideration of the already assigned channel standards and the characteristics of the broadcasting equipment in operation. NTSC defaults to refreshing the screen in an 'interaced = interlaced' fashion. Monitors using CRTs (including TVs) are a collection of light that is emitted when an electron gun hits the surface of the CRT and the electrons collide with the fluorescent material of the three primary colors (R, G, B) applied to the inner surface of the CRT. Will configure the screen.

The PAL (Phase Alternate Line) method is a TV broadcasting standard method developed by Telefunken Co., Ltd. of Germany and refers to a method of inverting the phase of a color carrier for each scan line. It is a broadcast method with a refresh rate of 25 frames per second, which lags behind the frame of NTSC but has a higher resolution because the vertical scan line has more than 625 lines and uses a higher bandwidth. This method has the advantage that the phase distortion generated in the transmission path is not affected, but has the disadvantage that it cannot be viewed with a black and white receiver. Europe, Australia, China and North Korea have adopted this method.

The SECAM (Systems Equential Couleur A Memoire) method refers to a TV broadcasting standard method of sequentially crossing a color difference signal for each scan line. The SECAM method was proposed by France and adopted as a standard in the Eastern European countries and some Central and South American countries, and eliminated the distortion of the image due to the frequency amplitude, but has a weak resolution in the vertical direction.

The main specifications of the three TV broadcasting standard system discussed above are as follows. In case of NTSC, 525 shots, number of transmission images: 30 shots / sec, field frequency: 60Hz, interlaced scanning: 2: 1, aspect ratio: 3: 4, video frequency range: 4.2MHz, audio frequency range: 6MHz to be.

In case of PAL, 625 scan players, number of images to be transmitted: 25 shots / sec, field frequency: 50Hz, interlaced scanning: 2: 1, aspect ratio: 3: 4, video frequency range: 5.5MHz, voice frequency range: 7MHz to be.

In case of SECAM, 625 scan players, 25 images per second, field frequency: 50Hz, interlaced scanning: 2: 1, aspect ratio: 3: 4, video frequency range: 5.5MHz, audio frequency range: 8 MHz.

As described above, since the subcarrier frequency is different because the TV broadcasting standard method differs according to the region, the demodulator data corresponding to the TV broadcasting standard method of the region is programmed so that each data is transferred from the microcomputer to the audio IC. Because of the setting method, a different circuit is configured in each region, which leads to an increase in product development period.

SUMMARY OF THE INVENTION The present invention has been made to overcome the above-mentioned conventional problems, and an object of the present invention is to provide a general-purpose audio IC that can be used in a region where TV broadcasting standard schemes are different.

The method of the present invention for achieving the object of the present invention is a method for automatically adjusting the demodulator data of the audio IC of the TV that can be used jointly in a region different from the TV broadcast standard scheme, the broadcast signal transmitted from the broadcasting station is tuned to the intermediate frequency Processing; Inputting an audio signal of the intermediate frequency processed broadcast signal into the audio IC; After comparing the reference data of the TV broadcasting standard methods pre-stored in the audio IC with the audio signal input to the audio IC, recognizing the TV broadcasting standard method used for the audio signal, and the TV recognized from the demodulator data of the pre-stored audio IC. And selecting and setting demodulator data of the audio IC corresponding to the broadcast standard method.

Preferably, the TV broadcast standard scheme is characterized in that the NTSC, PAL or SECAM.

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

Referring to FIG. 1, a schematic configuration diagram of a general TV audio IC is as follows.

The TV illustrated in FIG. 1 includes a tuner 100, an IF processor 200, an audio IC 300, and a microcomputer 400. The audio IC 300 includes an auto gain controller (AGC) 310, A / D converter 320, demodulator 330, register 340 and audio processor 350.

The tuner 100 tunes a broadcast signal transmitted from a broadcast station, and the broadcast signal tuned by the tuner 100 is input to the IF processor 200 and processed in an intermediate frequency. The voice signal of the broadcast signal processed by the IF processor 200 is input to the AGC 310 of the audio IC 300 and the gain is automatically adjusted.

The signal output from the AGC 310 is input to the A / D converter 320 and the voice signal is converted to digital, and then input to the demodulator 330.

The register 340 stores reference data of various TV broadcast standards, and also stores data values of demodulators corresponding to the TV broadcast standards.

The audio signal input to the demodulator 330 is compared with reference data of various TV broadcasting standard methods stored in the register 340, and then, it is determined which TV broadcasting standard method is transmitted. The determination result is applied to the microcomputer 400, and the microcomputer controls the audio IC to select and set demodulator data corresponding to the TV broadcasting standard method currently being received.

2 is a flowchart of a method for automatically adjusting demodulator data of an audio IC of a TV according to the present invention.

As shown in FIG. 2, in order to automatically adjust the demodulator data of the audio IC, first, a tuner of a television tunes a broadcast signal transmitted from a broadcasting station (P1).

The broadcast signal tuned by the tuner of the television is input to an IF processor for processing an intermediate frequency to perform an intermediate frequency processing (P2). The audio signal of the broadcast signal output from the IF processor is input to the audio IC of the television (P3).

Then, the audio signal input to the audio IC is compared with previously stored reference data of various TV broadcasting standard schemes, and thereafter, a process of recognizing which TV broadcasting standard scheme is the audio signal is performed (P4).

The demodulator data of the audio IC corresponding to the recognized TV broadcasting standard method is selected from the pre-stored demodulator data of the audio IC (P5).

The audio IC is set based on demodulator data of the audio IC selected in step P5 (P6).

Then, the voice signal is processed according to the set data (P7).

What has been described above is merely an exemplary embodiment of a method for automatically adjusting demodulator data of an audio IC of a TV according to the present invention, and the present invention is not limited to the above-described embodiment, and as claimed in the following claims, Without departing from the gist of the present invention, anyone of ordinary skill in the art will have the technical spirit of the present invention to the extent that various modifications can be made.

As described above, according to the method for automatically adjusting the demodulator data of the audio IC of the TV of the present invention, even in a region where the TV broadcasting standard method is different, by adjusting and setting the demodulator data of the corresponding audio IC automatically, the TV broadcasting standard method is set. Even televisions of different regions can use the same audio IC.

1 is a schematic configuration diagram of an audio IC of a general TV.

2 is a flowchart of a method for automatically adjusting demodulator data of an audio IC of a TV according to the present invention.

* Description of the symbols for the main parts of the drawings *

100: tuner 200: intermediate frequency processing unit

300: audio IC 310: AGC

320: A / D converter 330: demodulator

340: Register 350: audio processor

400: micom

Claims (2)

In the method of automatically adjusting the demodulator data of the audio IC of the TV that can be used jointly in a region where the TV broadcasting standard method is different, (a) tuning a broadcast signal transmitted from a broadcast station to process an intermediate frequency; (b) inputting a voice signal of the intermediate frequency processed broadcast signal to the audio IC; (c) comparing the reference data of the TV broadcasting standard schemes pre-stored in the audio IC with the audio signal input to the audio IC, and then recognizing the TV broadcasting standard scheme used for the audio signal; and (d) selecting and setting demodulator data of an audio IC corresponding to the recognized TV broadcast standard method from among previously stored demodulator data of the audio IC. The method of claim 1, wherein the TV broadcast standard method is NTSC, PAL, or SECAM.