Method for adjusting audio frequency and audio frequency adjustment device

An audio frequency adjustment device, comprising:

• a buffer, configured to receive a piece of audio data;
• and
• a frequency feedback circuit, coupled to the buffer, wherein the frequency feedback circuit is configured to obtain an initial frequency and a temporary data storage of a piece of audio data input to the buffer, the frequency feedback circuit is configured to perform a first adjustment procedure on the initial frequency, wherein the first adjustment procedure comprises:
• obtaining a first variation of the temporary data storage corresponding to a first change of the initial frequency, wherein the first variation indicates a change of a water level value of the buffer;
• calculating a first frequency correction amount according to a first period of the first adjustment procedure and the first variation;
• and
• adjusting the initial frequency into a first frequency according to the first frequency correction amount;
• wherein the frequency feedback circuit is configured to input the first frequency to the buffer, the frequency feedback circuit is configured to perform a second adjustment procedure on the first frequency, wherein the second adjustment procedure comprises:
• obtaining a second variation of the temporary data storage corresponding to a second change of the first frequency, wherein the second variation indicates a further change of the water level value of the buffer;
• calculating a second frequency correction amount according to a second period of the second adjustment procedure and the second variation, wherein the first period of the first adjustment procedure is less than the second period of the second adjustment procedure;
• and
• adjusting the first frequency into a target frequency according to the second frequency correction amount,
• wherein if the second variation causes a data capacity of the buffer to exceed a limit value, the frequency feedback circuit is configured to calculate the second frequency correction amount according to the second period of the second adjustment procedure and the second variation to adjust the first frequency into a second frequency according to the second frequency correction amount so as to input the second frequency into the buffer, wherein the frequency feedback circuit is further configured to perform the first adjustment procedure on the second frequency to obtain a third variation of the temporary data storage corresponding to a third change of the second frequency, wherein the frequency feedback circuit is further configured to calculate a third frequency correction amount according to the first period of the first adjustment procedure and the third variation, and adjust the second frequency into a third frequency according to the third frequency correction amount.