Method for testing self-closed loop performance of voice coder decoder of satellite mobile communication terminal

The invention discloses a method for testing self-closed loop performance of a voice coder decoder of a satellite mobile communication terminal. The method comprises the following steps: successively detecting whether the connection of an FPGA with an analog-digital converter and a voice coder decoder is normal, the signaling control of the FPGA on the voice coder decoder is normal, and the self-closed loop performance of the analog-digital converter is normal, and then conducting the testing of the self-closed loop performance of the voice coder decoder: enabling the externally connected input end of the analog-digital converter, and enabling the analog-digital converter to enter a normal operating mode; enabling the externally connected input end of the voice coder decoder, and enabling the voice coder decoder to enter the self-closed loop function operating mode; inputting 2 KHz signals to the input end of the analog-digital converter; checking whether output signals are 2 KHz signals or not, wherein the self-closed loop function of the voice coder decoder is normal when the output signals are 2 KHz signals, and is abnormal when the output signals are not 2 KHz signals. The method ensures that the voice coder decoder achieves the good self-closed loop performance, and provides guarantee for good data transmission performance of the satellite mobile communication terminal.