Apparatus and method for identifying television audio standard
An identification method and a standard technology, applied in the direction of TV, color TV, color TV parts, etc., can solve the problems of TV manufacturers such as increased development and design, product function limitation, burden of product maintenance, etc.
Active Publication Date: 2011-01-26
REALTEK SEMICON CORP
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Problems solved by technology
[0003] As far as the existing TV signal receiving devices are concerned, different circuit designs are usually made for specific broadcast audio format signals to meet the carrier and its decoding methods. However, this has caused functional limitations of the product itself. It can be limited to a specific area. If it is to be used in other areas, it must be realized by using additional products that meet the specifications of the broadcasting system in that area.
As a result, not only will chip designers of TV audio control chips have to design and manufacture different control chips for different TV audio standards, but it will also increase the burden of development and design for TV manufacturers and cause troubles in product maintenance.
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[0034] The audio standard (Audio Multi-Standard) mentioned in the present invention (including the claims) includes the broadcast audio format signals (11 kinds) of broadcasting systems currently used all over the world, as shown in the carrier schematic diagram of the audio standard in Figure 1 11 A broadcast audio format signal. It should be noted here that the carriers of the above broadcast audio format signals will be formed at 4.5MHz, 4.72MHz, 5.5MHz, 5.74MHz, 5.85MHz, 6MHz, 6.25MHz, 6.4MHz, 6.5MHz, 6.552MHz, 6.6MHz, and 6.74MHz and other 12 frequency bands in one or more frequency bands.
[0035] It can also be seen from the figure that, in the carriers of different broadcast audio format signals, in order to achieve bilingual or stereo sound effects, there will be carriers in two frequency bands at the same time, and the filled horizontal bars in the figure represent the main Carrier, the auxiliary carrier is represented by a blank horizontal bar, and the present inv...
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The invention provides an audio standard identification device, which records frequency bands of carrier waves of a plurality of broadcasting audio format signals in advance. The identification device comprises a carrier wave calculating unit and a switching control unit. An intermediate frequency signal is received through the carrier wave calculating unit; respective first carrier wave energy of the intermediate frequency signal on a plurality of frequency bands is calculated; at least one frequency band with the carrier wave is determined by the switching control unit according to all the first carrier wave energy; a main carrier wave of the frequency band having the carrier wave is analyzed according to at least one threshold to acquire an effective carrier wave; and the effective carrier wave is compared with the frequency band of the carrier waves which are recorded in advance so as to conform a corresponding broadcasting audio format signal. Therefore, the aim of correctly determining the audio standard to support broadcasting systems of each country can be achieved.
Description
technical field [0001] The invention relates to television audio standards, in particular to an audio standard identification device and method used in analog television broadcasting. Background technique [0002] In the TV broadcasting signal, the voice signal part is defined by the TV Audio Standard, which includes definition specifications of monaural broadcasting, stereophonic broadcasting or bilingual broadcasting, etc. At present, the global TV audio standards can be mainly divided into four broadcast audio format signal standards, namely: A2, EIAJ, BTSC and NICAM, of which A2 can be further divided into FM A2BG, FM A2 DK1, FM A2 DK2 , FM A2 DK3, and FM A2 M, etc., and NICAM can be divided into four different specifications: AM mono L NICAM, FM mono I NICAM, FM mono BG NICAM, and FM mono DK NICAM. In different countries or regions, broadcasting systems that use different broadcast audio format signals are often used, for example: the EIAJ standard used by the Japanese...
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IPC IPC(8): H04N5/60
Inventor 洪珊婷杜益昌廖清贤陈修宏彭瀛全
Owner REALTEK SEMICON CORP