Audio processing system with function of automatic gain control and method thereof

An audio processing system with a function of automatic gain control, the system comprising:

• a storage unit for storing a plurality of audio files, and a gain setting table, the gain setting listing a plurality of genre types with a genre gain value corresponding to each one of the genre type;
• a processing unit for fetching an audio file from the storage unit after receiving a playing command to play the audio file;
• a decoding unit for decoding the audio file fetched and generating digital audio signals;
• a digital/analog converter for converting the digital audio signals to analog audio signals;
• and
• wherein the processing unit comprises:
• an identifying module for reading a genre type of the audio file from a tag of the audio file;
• an obtaining module for reading a genre gain value of the genre type from the gain setting table;
• a gain adjusting module for signaling a gain amplifier to amplify the analog audio signals received from the digital/analog converter by the genre gain value, and for adjusting a default gain value stored in the storage unit to an adjusted gain value in response to a gain adjusting command;
• a calculating module for calculating an integrated gain value by assigning a weight value respectively to the genre gain value and the adjusted gain value, multiplying the genre gain value and the adjusted gain value by the corresponding weight value assigned, thereby obtaining two products, and summing the two products to obtain the integrated gain value;
• and
• an updating module for updating the genre gain value of the genre type in the gain setting table with the integrated gain value.

An automatic gain control method of an audio processing system, the method comprising steps of:

• receiving a playing command to play an audio file;
• reading a genre type of the audio file from a tag of the audio file;
• reading a genre gain value of the genre type from a gain setting table stored in a storage unit;
• decoding the audio file and generating digital audio signals;
• converting the digital audio signals to analog audio signals;
• and
• signaling a gain amplifier to amplify the analog audio signals by the genre gain value;
• receiving a gain adjusting command to adjust a default gain value stored in the storage unit;
• adjusting the default gain value to an adjusted gain value;
• assigning a weight value respectively to the genre gain value and the adjusted gain value;
• multiplying the genre gain value and the adjusted gain value by the corresponding weight value assigned, thereby obtaining two products;
• summing the two products to obtain an integrated gain value;
• and
• updating the genre gain value of the genre type read from the gain setting table with the integrated gain value.