Emergency frequency modulation broadcast instruction receiving method

Abstract

The invention provides an emergency frequency modulation broadcast instruction receiving method in the technical field of emergency broadcast. The emergency frequency modulation broadcast instruction receiving method comprises the following steps: step S10, monitoring an RSSI value and an SNR value after an emergency broadcast terminal is started; step S20, receiving an RDS broadcast instruction by taking one data frame as a unit; step S30, carrying out quantity verification on the data frames; step S40, performing CRC (Cyclic Redundancy Check) on the data frame; step S50, performing error code check on the data frame based on the RDS broadcast instruction copy; step S60, performing error correction and verification on the data frame based on the instruction format; step S70, error correction and verification are carried out on each data frame in sequence through data flipping; s80, combining the data frames to obtain an RDS broadcast instruction, storing the RDS broadcast instruction as an RDS broadcast instruction copy, and pushing the RDS broadcast instruction to a power amplifier for emergency broadcast; and step S90, in the emergency broadcasting process, collecting the current value of the power amplifier in real time, and controlling the work of the power amplifier based on the current value. The method has the advantages that error correction is carried out on the RDS broadcast instruction, and the emergency broadcast effect is greatly improved.

Description

technical field [0001] The invention relates to the technical field of emergency broadcasting, in particular to a method for receiving emergency FM broadcasting instructions. Background technique [0002] In the transmission coverage network in the field of emergency broadcasting technology, the frequency modulation transmission coverage network (FM-RDS) is a very important transmission coverage network. The FM transmission coverage network is transmitted wirelessly, and the synchronization of audio transmission is better. The timeliness of the broadcast channel for encoding and decoding, and the timeliness of the FM transmission coverage network have obvious advantages. RDS (Radio Data System) is a wireless data broadcasting system, which is a communication protocol standard for embedding a small amount of digital information in analog FM broadcasting. [0003] However, the FM transmission coverage network has the following disadvantages: 1. The analog signal can only tran...

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Problems solved by technology

[0003] However, the FM transmission coverage network has the following disadvantages: 1. The analog signal can only transmit one program, and the amount of data transmitted is very small; 2. When the signal strength is low, there will be obvious background noise. In the case of outdoor power expansion , the noise is also more obvious, causing disturbance to the people; 3. When the signal strength is low, the bit error rate of the RDS broadcast command (broadcast command sent through the FM transmission coverage network) is very high, causing the emergency broadcast terminal to be unable to wake up for a long time

[0004] To sum up, when the signal strength of the RDS broadcast command is low, the noise floor and the bit error rate are high, and the amount of data transmitted is small, which directly affects the emergency broadcast effect.

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