Method And System For Sampling Rate Mismatch Correction Of Transmitting And Receiving Terminals

A system for sampling rate mismatch correction of transmitting and receiving terminals, wherein said system comprises a time delay estimator, a sampling rate mismatch estimator and a sampling rate adjustor, wherein

• the input of the time delay estimator is coupled to a transmitting terminal signal and a receiving terminal signal;
• the output of the time delay estimator is connected to the input of the sampling rate mismatch estimator, the output of the sampling rate mismatch estimator is connected to the input of the sampling rate adjustor;
• the input of the sampling rate adjustor is also coupled to the transmitting terminal signal or the receiving terminal signal;
• and the output of the sampling rate adjustor is connected to an echo cancellation system;
• the time delay estimator is configured to calculate a transfer function of the receiving terminal signal relative to the transmitting terminal signal at each sampling timing according to the transmitting and receiving terminal signals, and obtain a transmission time delay of the transmitting and receiving terminals at each sampling timing using the transfer function;
• the sampling rate mismatch estimator is configured to obtain a sampling rate mismatch of the transmitting and receiving terminals at each sampling timing by means of parameter fitting using the transmission time delay and the linear relationship between the transmission time delay and the sampling rate mismatch;
• and
• the sampling rate adjustor is configured to adjust the sampling rate of the transmitting terminal signal or the receiving terminal signal at each sampling timing according to the sampling rate mismatch to achieve sampling rate correction, and inputting the transmitting terminal signal and the receiving terminal signal that have the same sampling rate after corrected to an echo cancellation system to carry out echo cancellation.