Explanation of RDS radio station TA and AF

There are two main methods for transmitting audio. They are commonly known as FM and am. The sound quality of FM is good, and they are stereo, but it has a fatal weakness, that is, the transmission distance is too short, and this is the strength of AM. Of course, it is not a big problem when we are fixed somewhere, but when we are going to another place, such as going from Guangzhou to Shenzhen, the Pearl River Economic console may not be able to accept it, or the launch frequency has changed.

What should we do? Is there any way to combine the advantages of FM and am? The smart Europeans developed the apsaradb for RDS audio receiving system. RDS is a special radio broadcast developed by BBC ), it uses subcarriers to send radio station names, program types, program content and other information in digital form in FM Broadcast Transmitting signals. The tuner with the RDS function can recognize these digital signals and turn them into characters displayed on the display screen.

The essence of RDS broadcast is its AF and TA functions! Generally, if a radio station wants to expand its coverage rate, it will certainly launch multiple frequency points. For example, a radio station has two frequency points: 107.5 and 100.8 MHz. When you are driving a car to listen to it, when you go to a certain place, the signal suddenly gets worse. You have two options: one is to listen, almost It doesn't matter; second, manually adjust the frequency to 107.5mhz and try to see clearly (it is dangerous to drive the car ).

At this time, if your car radio has the RDS function, it will be much better! The AF function is enabled. If the signal level of the radio station you are listening to is good, it does not act. When the signal level is lower than a certain level, the AF function will automatically search for other launch frequencies of the current station (you do not know this process, and it will never be mistaken for other stations ), when the AF finds another signal that is better and more stable than the original one, it will automatically jump over (of course, the program is still the same ). For example, you have been listening to the Guangzhou radio station, but the car has arrived in Shenzhen, and 100.8 has no signal, at this time, RDS's AF function will also search for another launch frequency of Guangzhou radio in Shenzhen, so that you can listen to the program without interruption.

Next, let's talk about another powerful feature of the apsaradb for RDS audio recording system: the TA feature. When we listened to the news from the Shenzhen news consultation platform, the car had arrived in Beijing, and the signals of Shenzhen radio station could not have been launched in Beijing. What should we do? The apsaradb for RDS Audio reception system provides a compromise: When you enable the TA function, when you are listening to a program that has no signal received, it will automatically search for the same type of programs you love to listen, and the best signal is selected. In other words, your Shenzhen news in Beijing cannot be heard, and ta will automatically help you find a station that is also a news program to listen to. Does it feel good ?!

In addition, RDS radio station has a unique "Traffic Information" function to ensure the safety of vehicle travel. It is in case of any major traffic information, such as road congestion, car accidents, landslides, and special traffic information sent by the radio station. As far as I know, Garmin's real-time traffic condition information is received by apsaradb for RDS, which leaves a lot of space for future expansion.

Unfortunately, there are few RDS radio stations in China. If you are in Shenzhen or Zhuhai, which is adjacent to Hong Kong and Macao, you can receive RDS radio stations in Hong Kong. Even in Shenzhen, you can receive four RDS radio stations in Hong Kong, there is also one in Shenzhen. Friends in several major cities, such as Guangzhou, Shanghai, and Beijing, may also search for them.

From: http://bbs.flyaudio.cn/ShowPost.asp? Threadid = 31024