Patent ID: 6052419
Filing Date: 2000-04-18
Classification: H03D,H03J

Abstract:
A frequency adjusting method for use with a digital receiver, the method comprising the steps of:receiving a digital signal;converting the frequency of the received digital signal into an intermediate frequency signal;measuring and calculating a frequency deviation of the intermediate frequency signal for each sample to obtain a calculated value;controlling a local oscillator corresponding to the calculated value;detecting a receiving condition of the digital signal which presents a sharp deviation of a receiving electric field intensity to obtain a deviation value; andcompensating the calculated value corresponding to the receiving condition;wherein the deviation value of the receiving electric field intensity is obtained for a receiving time equal to one burst (data of N symbols, where N is an integer);the deviation value of the receiving electric field intensity being the absolute value of the difference between the (N-1)th value of the receiving electric field intensity and the N-th value of the receiving electric field intensity; andfurther, wherein the compensating step includes comparing the difference absolute value with a predetermined threshold value, and removing the N-th value from the measuring and calculating step when the absolute value exceeds said predetermined threshold value.